If a solid block of substance is 78.0 cm by 55.0 cm by 35.0 cm and it weighs 569 g then its density is 0.00379 g/cm³.
Density of a substance = (mass of the substance)/(volume occupied by the substance)
Mass of the substance = 569 g.
Length of the block = 78.0 cm
Breadth of the block = 55.0 cm
height of the block = 35.0 cm
Volume of the substance = length x breadth x height
= 78.0 cm x 55.0 cm x 35.0 cm
= 150150 cm³
Density of this substance = 569 g/150150 cm³
= 0.00379 g/cm³
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Brainliest 100pts
Part A:
In this lab we first mixed some liver with hydrogen peroxide in test tube #1 and observed foaming letting it completely react. Then we poured off the remaining liquid into a second test tube #2. Next we added fresh liver to test tube #2 and no reaction (foaming) occurred because;
A)The liquid in test tube #2 was Oxygen.
B)The liquid in test tube #2 was water.
C)The liquid in test tube #2 was Hydrogen peroxide.
D)The liquid in test tube #2 was Catalase.
Part B:
After pouring out the liquid from test tube#1 as described above, we then added fresh hydrogen peroxide back into test tube #1 with the original piece of liver still in it, and it began to foam again. The new foaming is evidence of which of the following claims?
Question 7 options:
After pouring out the liquid from test tube#1 as described above, we then added fresh hydrogen peroxide back into test tube #1 with the original piece of liver still in it, and it began to foam again. The new foaming is evidence of which of the following claims?
Question 7 options:
After pouring out the liquid from test tube#1 as described above, we then added fresh hydrogen peroxide back into test tube #1 with the original piece of liver still in it, and it began to foam again. The new foaming is evidence of which of the following claims?
A)The first chemical reaction produced more Catalase, and so when more hydrogen peroxide was introduced, the foaming began again.
B)The Catalase was still present in the liver tissue because the enzyme was not used up as a reactant in the chemical reaction.
C)After the liquid water was poured out earlier, the new hydrogen peroxide reacted with the oxygen in the air to start the foaming process again.
D)The Catalase was poured out of the test tube earlier leaving the hydrogen peroxide found in liver tissue to react again with oxygen.
In part A, The liquid in test tube #2 was Catalase. So option D is correct.
In part B, The new foaming is evidence of which of the claim that the Catalase was still present in the liver tissue because the enzyme was not used up as a reactant in the chemical reaction. So option B is correct.
What is catalase?Catalase can be described as an enzyme that will catalyze the reaction that breaks down hydrogen peroxide into oxygen and water.
Hydrogen peroxide is a strong compound that has the function of protecting microorganisms but due to its toxicity it must be transformed into less dangerous products, so catalase is vital as it breaks it down into oxygen and water.
We can confirm that the liquid in test tube #2 was catalase because it will break down hydrogen peroxide into water and oxygen so it will not react with the liver.
The new foaming is evidence of which of the claim that the Catalase was still present in the liver tissue because the enzyme was not used up as a reactant in the chemical reaction.
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the number 234.306 rounded off to five significant figures is
Answer:
234.31
Explanation:
234.306 = five significant figures
234.31 = rounded to five significant figures
The unbalanced reaction for the combustion of pentane (C5H12) is:
C5H12 + O2
CO₂ + H₂O
If the molar mass of pentane is 72 g/mol, how many kilograms of carbon dioxide will be created
when 8.46 kilograms of pentane combust? (Give your answer to the second decimal place)
The number of kilograms of carbon dioxide will be created when 8.46 kilograms of pentane combust correct to two decimal places is 25.85 kg
The balanced reaction for the combustion of pentane is as follows;
C5H12+8O2→6H2O+5CO2.
Molar mass of pentane is 72 g/mol
No of moles = 8460/72= 117.5 mol
We get 5 moles CO2 from 1 mole pentane
so the moles of CO2 are 5x117.5=587.5 mol
Mass of carbon dioxide will be 587.5x44= 25.85 kg or 25850 g
The number of moles is given mass by molecular mass.Combustion takes place in presence of oxygen and always gives carbon dioxide and water.To learn more about combustion visit:
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4
A chemist encounters an unknown metal. They drop the metal into a
graduated cylinder containing water, and find the volume change is
6.1 mL. If the metal weighs 8.1 g, what is the density of the metal in
g/mL?
The Density of metal is 1.32 g/mL.
density is the mass of a material substance per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the formula for density. Grams per cubic centimetre are a typical unit of measurement for density.Volume (V) is defined as mass divided by density (M/d). By multiplying a body's mass by the acceleration of gravity, one can get the weight of the object, which is typically more important practically than its mass.Despite the fact that the SI unit of density is kg/m3, we instead use g/cm3 for solids, g/ml for liquids, and g/L for gases out of convenience.Because various substances have varying densities, they weigh differently for a given volume.Given,
volume change observed by chemist when metal is dropped into the cylinder filled with water is 6.1 mL.
weight of metal is 8.1 g
we know that,
Density = mass / Volume
density = 8.1 / 6.1
Density = 1.32 g/mL
Hence, density of metal of mass 8.1 g is 1.32 g/mL
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Calculate the theoretical yield of KCl produced when 15.39 grams of Cl2 reacts.
Assume excess potassium. (K = 39.10 g/mol; Cl2 = 70.9 g/mol; KCl = 74.55 g/mol)
2 K + Cl2 à 2 KCl
Taking into account definition of theoretical yield, the theoretical yield of KCl produced when 15.39 grams of Cl₂ reacts is 32.36 grams.
Reaction stoichiometryIn first place, the balanced reaction is:
2 K + Cl₂ → 2 KCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
K: 2 molesCl₂: 1 moleKCl: 2 molesThe molar mass of the compounds is:
K: 39.1 g/moleCl₂: 70.9 g/moleKCl: 74.55 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
K: 2 moles ×39.1 g/mole= 78.1 gramsCl₂: 1 mole ×70.9 g/mole= 70.9 gramsKCl: 2 moles ×74.55 g/mole= 149.1 gramsDefinition of theoretical yieldThe theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Theoretical yield of KClThe following rule of three can be applied: if by reaction stoichiometry 70.9 grams of Cl₂ form 149.1 grams of KCl, 15.39 grams of Cl₂ form how much mass of KCl?
mass of KCl= (15.39 grams of Cl₂×149.1 grams of KCl)÷ 70.9 grams of Cl₂
mass of KCl= 32.36 grams
Finally, the theoretical yield of KCl produced when 15.39 grams of Cl₂ reacts is 32.36 grams.
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Following is a list of observations from a chemistry laboratory. Place them in the appropriate category.
Evidence of a chemical change or no evidence of a chemical change
1Water boiling
2A candle being lit
3A white cloudy substance occurs after mixing two clear solutions.
Burning toast
4Yellow and blue paints mixed together
What does the Law of Conservation of Mass state? (1 point)
O Matter cannot be rearranged during a chemical reaction.
O The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
O Matter is neither created or destroyed in a chemical reaction, only rearranged.
O The total mass of reactants prior to a chemical reaction is greater than the mass of the product due to the release of energy
Answer:
(Question) What does the Law of Conservation of Mass state?
(Answer) The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.
(Question) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.
(Answer) 30 grams
(Question) 78 g of potassium (K) react with 71 g of chlorine (Cl) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?
(Answer) 149 g
(Question) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?
(Answer) 7
(Question) Which of the following equations demonstrates the Law of Conservation of Mass?
(Answer) CH4+O2→C+2H2O
Explanation:
just finished the quick check. enjoy
The correct statements are statement 2 and statement 3 about conservation of mass.
To understand this, let us first understand the Law of Conservation of Mass.
The Law of Conservation of Mass was given by Antoine Lavoisier in 1789.
It states, "a mass in an isolated system can neither be created nor destroyed by chemical or physical transformations. It can only change its form. Also, in a chemical reaction, the mass of reactants is equal to the mass of products."
Now that we know the Law of Conservation of Mass, let us understand the statements given in the question.
Statement 1 is a wrong statement because in a chemical reaction, mass cannot be created or destroyed, but it can be re arranged. We can use the reactants of any mass and can be rearranged. The mass of the reactants will be the mass of the products. Rearranging the mass of the reactants won't create new mass or destroy the mass present.
Statement 2 is correct because we have mentioned above that the law states that in a chemical or physical reaction mass of reactant is equal to mass of products. The total mass which we use remains the same, it doesn't change, hence, making no changes in the total mass of the products. Taking a very simple example of an eraser, we can prove it. If we take an eraser and cut it into small pieces, then, the eraser (reactant) will not change its mass when cut into pieces (product) but only will change its form (shape). Thus, we can see that the total mass of product is equal to the total mass of the reactant.
Statement 3 is also correct. Mass can neither be created nor destroyed, only rearranged. We can know this by a simple example of NaCl (Sodium Chloride). If we take 2 g of Na and 3 g of Cl then the product will have the same mass as 5 g of NaCl. In this reaction, we can rearrange the mass by either adding the reactant's mass or by interchanging the mass of reactants. But in any case, the total mass of product will be equal to total mass of reactants.
Statement 4 is wrong because the chemical reactions are energy releasing. Sometimes the physical reactions are also energy releasing but energy is not mass. Mass and energy are two different terms. The Law of Conservation of Mass states about mass particularly. We might even provide energy or energy might release but that won't affect mass. For example, if we have taken 10 mL of water and after providing energy, the atoms are brought together to make it into ice then ice will also have 10 mL of water. Even if we melt ice then it will again change back to water which is 10 mL. Hence, a wrong statement.
Thus, we can conclude that statement 2 and 3 are correct statements about the Law of Conservation of Mass.
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What is the statement of how data changes with a change in the variable
Helpppppppp
Data changes with a change in the variable means 'changes in one variable brings about changes in the other'
A change of variables is the basic technique in which it is used to simplify problems in which originals variables are replaced with function of other variables and that's why data is also change and sketch the region given by the problem in the xy plane and then write the equation of the curves that form the boundary
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A jeweler offers to sell you a ring he claims is pure palladium, which has a density of 12.02 g/mL. Before buying, you ask to test the jeweler’s claim. You find that the ring has a mass of 16.1 g, and when you add it to a graduated cylinder containing 10.2 mL of water, the volume rises to 12.1 mL. Is his claim that the ring is made of pure palladium true?
Taking into account the definition of density, the jeweler’s claim that the ring is made of pure palladium is not true.
Definition of densityDensity is defined as the property that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
How to know if the ring is made of pure palladiumIn this case, you know that:
Mass= 16.1 gTotal volume= 12.1 mLVolume of water= 10.2 mLVolume= Total volume - Volume of water= 12.1 mL - 10.2 mL= 1.9 mLReplacing in the definition of density:
density= 16.1 g÷ 1.9 mL
Solving:
density= 8.47 g/mL
A ring he claims is pure palladium, which has a density of 12.02 g/mL. You find that the density of the ring is 8.47 g/mL. Since the density is not the same, the jeweler’s claim that the ring is made of pure palladium is not true.
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Density is an intensive physical property because the density of a given substance does not change with the size of the sample true false
This statement about density is True.
The mass of a material substance per unit volume is known as density. The equation for density is d = M/V, where d represents density, M is mass, and V is volume. Density is often measured in grams per cubic centimeter. For instance, water has a density of 1 gramme per cubic centimeter, compared to Earth's density of 5.51 grammes.
The kilograms per cubic metre unit is another way to express density (in metre-kilogram-second or SI units). For instance, the weight of air per cubic meter is 1.2 pounds. The densities of typical solids, liquids, and gases are listed in textbooks and manuals. Through density, it is simple to calculate a body's mass from its volume or vice versa.
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Which substance is she most likely measuring?
The radioactive substance which she is most likely measuring is cobalt-60
The correct answer choice is c
From the analysis given, this means that Juliet is measuring cobalt-60 as it was decreasing in mass from 200g to 50g. In addition to this, it is a synthetic radioactive material.
What are radioactive substances?Radioactive substances are those substances which undergoes radioactive decay. That is, the nucleus of these materials changes from an unstable to stable form by disintegrating.
However, these substances usually, frequently and most of the time used for diagnosis and also treatment of diseases. They are also used to study certain structures in the thebody.
So therefore, the radioactive substance which she is most likely measuring is cobalt-60. The correct answer choice is c
Complete question:
Juliet started working with a radioactive substance. In 1997, she started with 200 g. When she measured again in 2002, she had 100 g left. In 2007, she had 50 g. Which substance is she most likely measuring?
A. rubidium-91
B. iodine-131
C. cobalt-60
D. carbon-14
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0
How many significant figures are in the number 0.02020 × 10¹5?
Answer:
There is the
Explanation:
2 Significant figures are there
what volume of a 0.30 M solution of glucose contains 0.025 mol of glucose
Answer:
83 ML glucose
Explanation:
Does fog from near the ground
When the air close to the ground cools down enough, the water vapor condenses into liquid water or ice, creating fog.
What produces fog?When cold air passes over warm water, steam fog is created. The warm moist air over the lake cools when it comes in contact with the cool air, reaching a humidity level of 100% and forming fog.
What are the dangers of fog?Fog can be dangerous for vehicles, seafarers, and aviators, especially when it's dense. Every year, a lot of traffic accidents are caused by fog. Fog-related visibility limitations can affect take off and landing procedures and requirements for pilots and can contribute to weather-related delays in aviation.
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The complete question is -
Why does fog form near the ground?
If germanium, has an electron configuration by shell of 2 8 18 4, in what orbitals are the valence electrons?
Check all that apply.
If germanium, has an electron configuration by shell of 2 8 18 4, in what orbitals are the valence electrons?Check all that apply.
1s
1
s
2s
2
s
2p
2
p
3s
3
s
3p
3
p
3d
3
d
4s
4
s
4p
4
p
4d
4
d
4f
4
f
Based on the electronic configuration of Germanium which is 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p², the orbitals containing the valence electrons are the 4s and 4p orbitals.
What is electronic configuration?Electronic configuration is the arrangements of electrons in orbits or electron shells around the nucleus of an atom.
The electronic configuration an atom describes the number of electrons present in the atom as well as the number of valence electrons in the atom.
The electronic configuration of atoms serves as the basis of the periodic table where elements with the same number of valence electrons belong to the same group and elements with the same number of of electron shells are found in the same period.
The electronic configuration of Germanium is as follows:
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p²From the above electronic configuration, the valence electrons of germanium are found in the 4s and 4p orbitals.
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A jeweler offers to sell you a ring he claims is pure palladium, which has a density of 12.02 g/mL. Before buying, you ask to test the jeweler’s claim. You find that the ring has a mass of 16.1 g, and when you add it to a graduated cylinder containing 10.2 mL of water, the volume rises to 12.1 mL. What volume of water (in mL) should be displaced by a 16.1 g ring of pure palladium?
The volume of water (in mL) that should be displaced by the 16.1 g ring of pure palladium is 1.3 mL
What is density?
The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the volume of the water displacedWe can obtain the volume of water displaced by calculating the volume of the pure palladium ring. This is illustrated below:
Mass of palladium = 16.1 gDensity of palladium = 12.02 g/mLVolume of palladium =?Density = mass / volume
Cross multiply
Density × volume = mass
Divide both sides by density
Volume = mass / density
Volume of palladium = 16.1 / 12.02
Volume of palladium = 1.3 mL
Thus, the volume of water that should be displaced by the 16.1 g of pure palladium is 1.3 mL
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Explain the difference between the energy level changes in a blue vs red photon?
Answer:
Different colors of light are associated with different photon energies. Essentially, a photon is a packet of light. For example, a photon of red light would have less energy than a photon of blue light. This ties in with wavelengths because red has longer wavelengths than blue which results in less energy.
Explanation:
Red photons of light carry about 1.8 electron volts (eV) of energy, while each blue photon transmits about 3.1 eV. Visible light's neighbors on the EM spectrum are infrared radiation on the one side and ultraviolet radiation on the other.
A radio station's channel, such as 100.7 FM or 92.3 FM, is actually its frequency in megahertz ( MHz M H z ), where 1MHz=106Hz 1 M H z = 10 6 H z and 1Hz=1s−1 1 H z = 1 s − 1 . Calculate the broadcast wavelength of the radio station 100.7 FM. Express your answer to four significant figures and include the appropriate units.
The broadcast wavelength of the radio station 100.7 FM is 2.979 m
Relationships between frequency and wavelengthThe frequency and wavelength of a wave are related according to the following equation
Velocity (v) = wavelength (λ) × frequency (f)
v = λf
With the above formula, we can obtain the wavelength. Details below.
From the question given above, the following data were obatained:
Frequency (f) = 100.7 MHz = 100.7×10⁶ HzVelocity (v) of radio waves = 3×10⁸ m/sWavelength (λ) = ?We can obtain the wavelength as follow:
v = λf
3×10⁸ = λ × 100.7×10⁶
Divide both sides by 100.7×10⁶
λ = 3×10⁸ / 100.7×10⁶
λ = 2.979 m
Thus, the wavelength of the radio station is 2.979 m
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The reaction of the weak base aniline, C6H5NH2, with the strong acid hydrochloric acid yields aniline hydrochloride, C6H5NH3Cl. What is the hydronium ion concentration of a 0.163 M solution of aniline hydrochloride at 25.0∘C given that the value of Kb for aniline is 4.300×10−10?
The hydronium ion concentration of a 0.163 M solution of aniline hydrochloride is
[H30+]=1.95*10^{-3}m
This is further explained below.
What is the hydronium ion concentration of a 0.163 M solution of aniline hydrochloride at 25.0∘C given that the value of Kb for aniline is 4.300×10−10?Generally, The dissociation of salt
[tex]&\mathrm{C}_{6 \mathrm{HSNH}_3}^{+} \mathrm{Cl}^{-} \rightleftharpoons \mathrm{CoHSNH}_3^{+}+\mathrm{Cl}^{-}\\\\&\left.6 \mathrm{CHNH}_3^{+}+\mathrm{H}_2 \mathrm{O} \geqslant 645 \mathrm{MH}_2+4_3 \text { ( }\right) \text { (ka) }\\\\&\mathrm{CeHSSNH} 2+\mathrm{N}_2 \mathrm{O} \rightleftharpoons \mathrm{C64} \mathrm{CNM}_3^{+}+\mathrm{OH}(\mathrm{Kb}[/tex]
Since C6C5NH_3CL is a salt of a weak base and strong acid, therefore
[tex]K_a=\frac{k \omega}{10 b}\\\\K_a=\frac{1 \times 10^{-14}}{4.3 \times 10^{-10}}[/tex]
K_a=2.33*10^{-5}
using equation
[tex]\mathrm{C_6H_5NH}_3^{+}+\mathrm{H}_2 \mathrm{O} \underset{\mathrm{Ka}}{\rightleftharpoons} C_6H_5NH_2 \mathrm{NH}_2+ H_3O[/tex]
Then,
[tex]\mathrm{ka}=\frac{x^2}{(0.163-x)}\\\\ka=0.33 \times 10^{-5}$[/tex]
Since, the value of $x$ is negligible in comparison to 0.163, hence.
[tex]k a &=\frac{x^2}{0.163} \\[/tex]
x^2 =k a* 0.163
x^2=2.33 * 10^{-5}*0.163
x^2 =3.798* 10^{-6}
x =1.949*10^{-3}
Hence, The hydronium ion concentration of a 0.163 M solution of aniline hydrochloride is
[H30+]=1.95*10^{-3}m
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Why is crystallization a technique used in the purification of substances?
The process of crystallization helps us to obtain pure crystals of a solid substance.
What is crystallization?The term crystallization has to do with the process by which we are able to obtain the pure crystals of substances. Often times when we perform an experiment, it is common to see that the crystals that we have obtained are not pure. We could have a lot of particles of the solvent or of other reactants that is also contained in the substance.
Owing to the fact that we often need to use a substance that is very much pure in chemical analysis, it is often very important that we are able to use the method of crystallization to make the substance that is obtained pure.
We can do this by the introduction of a solvent that would make the target substance to separate out from the system as a solid crystal.
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How does the scale of energy released by the fusion process compare to the scale of energy
released by other, nonnuclear chemical reactions?
On a paper about the sun.
The energy released in other chemical reactions The energy released by the fusion process is roughly 3–4 times more than the energy liberated by the fission process.
Describe fusion:In a fusion reaction, two light nuclei merge to create a heavier nucleus. The process leads to the generation of energy because of the mass of the single nucleus that forms is less than the sum of the masses of the two original nuclei. Any leftover mass is transformed into energy.
What happens in the fusion process first?A deuterium (2H) nucleus is created from two protons in the first step of the hydrogen fusion process, along with an antielectron and a neutrino. Four hydrogen protons and two electrons are used in the basic hydrogen fusion cycle, which results in the creation of a helium nucleus, two neutrinos, and six photons.
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Methane (CH4) combines with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O). Describe the number and type of atoms for a molecule of each substance.
The number and type of atoms for a molecule of each substance are better understood by the given balanced chemical equation.
[tex]CH_4+2O_2[/tex] → [tex]2H_2O+CO_2[/tex]. What type of reaction is this?This reaction involves the combustion of methane in order to synthesize carbon dioxide and water. So, this reaction is also known as a combustion reaction.
According to the context of this question, one molecule of methane significantly reacts with two molecules of oxygen in order to form one molecule of carbon dioxide and two molecules of water.
Therefore, the number and type of atoms for a molecule of each substance are well represented by a balanced chemical equation.
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A rectangular block has dimensions 2.9 cm ✕ 2.0 cm ✕ 10.0 cm. The mass of the block is 695.0 g.
The volume of the given rectangular block with dimensions 2.9cm * 2.0cm * 10.0cm is 58cm3. The Density of the rectangular block is calculated to be 11.98 g/cm3.
The term volume refers to the quantity of three-dimensional space filled by an item.
The mass contained in a material for a given volume is referred to as its density.
The volume of a rectangular block formula is = L * W * H
Where
L is the block's length
The width of the block is denoted by W.
H is the block's height.
Given,
The rectangular block's dimensions are as follows
L=2.9cm
W=3.5cm
H= 10.0cm
Volume = L * W * H
= 2.9*3.5*10.0
Volume = 58cm3
Now, Density = Mass/ volume
Given, Mass = 695g
Density = 695/ 58
Density = 11.98 g/cm3
Disclaimer: As the question was incomplete, the complete question is :
A rectangular block has dimensions 2.9 cm × 3.5 cm × 10.0 cm. The mass of the block is 615.0 g. What is the volume of the block?
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Between thermal energy and heat
Thermal energy is heat it heats you up it give people heat it give away the heat it has until it is cold
Either you miswrote that or something else
9. Write the name of each of the following ionic
substances, using -ous or -ic endings to indicate
the charge of the cation.
a. CoCl2
b. CrBr3
c. PbO
d. SnO₂
e. Fe₂O3
f. FeCl3
The name of each of the following ionic substances , using -ous or -ic endings to indicate the charge of cation.
cationic name
(a) CoCl₂ Cobaltous chloride
(b) CrBr₃ Chromic Bromide
(c) PbO Plumbous oxide
(d) SnO₂ Stannic Oxide
(e) Fe₂O₃ Ferric oxide
(f) FeCl₃ Ferric Chloride
we use suffix -ous and -ic to represent the cation charges. it is called as cationic naming . we use -ic for greater charges (greater of 2 cation) and -ous suffix for the lower ones.
thus, the ionic compound s , cationic naming's are :
(a) CoCl₂ Cobaltous chloride
(b) CrBr₃ Chromic Bromide
(c) PbO Plumbous oxide
(d) SnO₂ Stannic Oxide
(e) Fe₂O₃ Ferric oxide
(f) FeCl₃ Ferric Chloride
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Define atomic radius.
The atomic radius is the total distance from an atom's nucleus to its outermost orbital of electrons.
What do you mean by Atomic radius?The atomic radius is the total distance from an atom's nucleus to its outermost orbital of electrons. A chemical element's atomic radius is described as follows: the usual or average distance between the nucleus's core and its outermost electron shells.
What does an atomic radius mean and how big is it?A molecule's atomic radius is determined by dividing the distance between neighboring atoms of the same element in half. It is challenging to determine the atomic radii of chemical elements because an atom's size is on the order of 1.210-10 m.
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Jamel is to receive Cleocin 289 mg IV for 6.00 hr. The concentration of the solution is 5.00 mg/mL. What is the volume of the solution in milliliters that will need to be delivered?
The volume of the solution in milliliters that will need to be delivered when the concentration of the solution is 5.00 mg/mL is 55.4 mL
The given solution contains 5mg in 1 mL
1 mg of cleocin will be present in 1/5 ml of solution.
277 mg of cleocin IV will be present in 1/5x277
that is 55.4 mL of solution
So the volume of solution is 55.4 mL
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value. The unitary method is used to write the value of a single unit from a given multiple.To learn more about unitary method visit:
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Cilia and flagella can be found in some animal cells, but not in plants cells.
(A) True
(B) False
Answer:(A) True
Explanation:
Jacob has taken several crime scene photographs of different pieces of evidence. He has successfully tagged each photo. What information should NOT be included in his notes for these photographs?
A.
the date and time the photo was taken
B.
the approximate weight of each item
C.
the file name and exposure
D.
a description on the photo and scene
Answer:
Explanation:
B.
the approximate weight of each item
The approximate weight of each item should not be included in his notes for these photographs. So, the correct option is (B).
What are Evidences?Evidence is an object or type of information which is presented to make the existence of a fact more or less probable. This may take the form of testimony, documents, photographs, videos, voice recordings, DNA testing, or other tangible objects.
Evidence can be either direct or physical. As in direct evidence, seeing someone commit some crime is direct evidence whereas in physical evidence, any object or material related to the crime can be any tangible object, big or small.
Evidence can be in the form of photographs which are collected from crime scene in which the date and time of taking the photo, file name and exposure and description on the photo and scene should be mentioned. The pictures should not mention the approximate weight of each item.
Thus, the approximate weight of each item should not be included in his notes for these photographs. So, the correct option is (B).
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Suppose that you find in a reference book that the volume of all the oceans is 1.4×109km3 . To find the mass, you can use the density of water, also found in this reference book, but first you must convert the volume to cubic meters. What is this volume in cubic meters?
The correct answer is 1.4 x 10^18 m^3.
The simple definition of density is the quantity of a substance (in terms of mass) per unit volume. The Latin letter D or the lower-case Greek letter, pronounced rho, are frequently used to represent it. The definition of density is given by the equation ρ = m/v, where m stands for the substance's mass and v for its present volume. Density is evidently directly proportional to mass and indirectly proportional to volume according to the equation. Pressure and temperature are two elements that influence a substance's density values. A substance's density value will increase with increased pressure and decreased temperature since these changes result in a reduction in volume.
V = volume = 1.4 x 10^9 km^3
we know that , 1 km = 1000 m = 10^3 m
hence , V = volume = 1.4 x 109 km3 = 1.4 x 10^9 (10^3 m )^3 = 1.4 x 10^18 m^3
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