Answer:
the molar mass un the human body in a sodium is seman see inside the testicle there is little bits of chemical chemistry call sodium or codename seman and inside the seman thye dehydrate before they race so aluminum feeds them for preparation
Explanation:
Suppose you have 100. 00 ml of a solution of a dye and transfer 2. 00 ml of the solution to a 100. 00ml volumetric flask. After adding water to the 100. 00 ml mark, you take 5. 00 ml of that solution and again dilute to 100. 00 ml. If you find the dye concentration in the final diluted sample is 0. 000158 m, what was the dye concentration in the original solution.
If we have 100.0 ml of a dye and transfer 2.00 ml of the solution to a 100.00 ml volumetric flask and after adding water to the 100.00 ml mark, we take 5.00 ml of the solution and again dilute it 100.00 ml such that the dye concentration in the final diluted solution is 0.000158 M, then the dye concentration in the original solution is 0.158 M.
When 5 ml of the solution was taken in that stage the number of moles of dye present in the solution at that time is same after diluting it with water to a volume of 100 ml.
So, Number of moles of dye in 5 ml = number of moles in final dilution
Molarity of dye in 5 ml x Volume of solution = Molarity in final dilution x final volume
M x 5ml = 0.000158 x 100
M = (0.000158 x 100)/ 5
= 0.0158/5 = 0.00316 M
Now, the number of moles present in 2 ml of the sample = number of moles on diluting it 100 ml.
Molarity of dye in 2 ml x Volume = molarity on diluting it x volume on diluting it
M x 2 ml = 0.00316 x 100
M = (0.00316 x 100)/2
= 0.158 M
Molarity of initial solution = molarity of 2 ml f the solution
= 0.158 M
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HELPPPPP!!!!
Describe the properties of alkaline earth metals. Based on their electronic arrangement, explain whether they can exist alone in nature.
The alkaline earth metals are highly reactive and do not exist free in nature.
What are the alkaline earth metals?The alkaline earth metals are the metals that are found in group two of the periodic table. They are the elements that have two electrons on their outermost shell. They are highly electropositive and as such, they do not exists as being free in nature.
We can see that the outermost electron configuration of the alkali earth metals is obtained as ns^2. This shows the fact that they are divalent and they also form divalent positive ions.
The alkaline earth metals only form ionic compounds in which they exists as the cation in the compound.
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Michael wanted to see what kitchen cleaner worked best for cleaning her counters. She used Lysol, Clorox, Pine-Sol, and just water. For each cleaner, he put 5 mm of grape juice on the counter, sprayed the cleaner, and wiped it with one paper towel. What is the independent variable in this scenario?
The independent variable is simply given as type of kitchen cleaner. Option B
This is further explained below.
What is the independent variable?Generally, The definition of an independent variable is precisely the same as its name.
It is a variable that is independent of the other factors that you are attempting to measure and does not change as a result of those variables.
For instance, the age of a person may be considered an independent variable.
In conclusion, The kind of kitchen cleaner is the only information provided for the independent variable. Alternative B
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CQ
Michael wanted to see what kitchen cleaner worked best for cleaning her counters. He used Lysol, Clorox, Pinesol, and just water. For each cleaner, he put 5 milliliters of grape juice on the counter, sprayed the cleaner, and wiped with one paper towel. What is the independent variable?
answer choices
amount of grape juice
type of kitchen cleaner
how well the grape juice stain was removed from the counters
the time it took to clean the counter top
If 6. 000 g of sugar is mixed with 9. 000 g of water, what is the concentration in weight percent?.
66.66% is the concentration in weight percent.
In chemistry, what is wt%?Weight percent is sometimes written as w/w, which means [weight of solute/weight of solvent*100 = percent of solute in solution]. In your case, 25 wt% tetramethylammonium in methanol means 25g of tetramethylammonium per 100g of methanol.The weight percentage of an element is calculated by dividing the weight of that element in the sample by the weight of all elements in the sample and multiplying the result by 100. The atomic percentage is calculated by dividing the number of atoms of that element at that weight percentage by the total number of atoms in the sample and multiplying by 100.Steps of the calculation:
weight percent = [tex]\frac{ mass of solute}{ mass of the solution}[/tex]× 100
= [tex]\frac{6.000}{9.000}[/tex] × 100
= 0.666×100
weight percent = 66.66%
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Jill is doing an experiment on the movement of pill bugs. She will place the pill bugs on flat surfaces covered with different materials to see how the texture of each material affects the bugs' movement.
Answer: BRO ONLY 5 POINTS RU MAD?
Explanation: FRGG G TRHGTHTFRH FHTYHRDSHYRSYH
the mass of an empty beaker is 4.995 g. using a pipet, 2.00 ml of an unknown acid solution is added to the beaker. the combined mass of the beaker and acid is 9.893 g. calculate the density of the acid solution.
The answer would be for this question is density = 1.95 g ml^-1.
Density is defined as the mass upon volume.
It is denoted by D.
Its unit is g/cm^3.
According to question,
Given,
Mass of an empty beaker = 4.995 g
Mass of unknown acid solution = 2.00 ml
Total or combined mass of the beaker = 9.893 g
To find density of the acid solution.
Calculation -
As you know the mass of empty beaker also the mass of the beaker increases after adding acid solution so,
Mass = 9.893 g - 4.995 g = 4.898 g
As the mass of an acid already mentioned only you need to get the value of the volume,
1 ml * 4.898 g / 2.0 ml = 2.449 g
Now the density of the acid solution is 1.95 g ml^-1.
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The best scientific theories not only explain and organize known facts but also
O a. generate new predictions.
O b. use historical perspectives.
O c. establish new facts.
O d. discredit other theories.
The best scientific theories not only explain and organize known facts but also (a) generate new prediction.
A scientific theory is made by performing various experiments to verify the observation made. A scientific theory is made by observing something, making hypothesis and testing that hypothesis using experiments and then coming to a conclusion. If the hypothesis made is proved wrong then a new hypothesis is made. And the process is repeated again.
A theory that is accepted now can be proved wrong in the near future. Or one can say that theory not necessarily be applicable in every situation.
The hypothesis that are made are nothing but generation of new predictions.
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Which set of elements is ordered from lowest to highest first ionization energy?
a.Arsenic, Bromine, Francium, Barium b.Francium, Barium, Arsenic, Bromine c.Bromine, Francium, Barium, Arsenic
d.Barium, Arsenic, Bromine, Francium
The order Francium, Barium, Arsenic, Bromine is ordered from lowest to highest first ionization energy as per their individual ionization energies.
Which element has the highest ionization energy and the lowest?Across the periodic table, the first ionization energy fluctuates in a predictable manner. In groups, the ionization energy drops while rising from left to right during the course of a period.
Helium on the periodic table thus has the highest first ionization energy, whereas francium has one of the lowest.
What element types would have the lowest initial ionization energy?Alkali metals have the lowest initial ionization energies because when one electron’s outermost shell is removed, they acquire a stable configuration.
What has the highest first ionization energy of the following?Due to its desire to absorb electrons and lack of tendency to lose them from its valence, fluorine has the highest initial ionization energy.
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oxygen forms a number of compounds with sulfur, many of which are quite reactive. one such compound is 57.20 % by mass s . calculate the number of grams of oxygen present in a sample of this compound that contains 56.00 grams of s .
The grams of oxygen present in a sample of this compound that contains 56.00 grams of S = 41.9g of oxygen.
Calculation of quantity of OxygenThe compound contains the following:
Sulphur = 57.20%
Oxygen = 100 - 57.20 = 42.80%
If 57.20% of the sample contains 56g of Sulphur, then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 56/57.20
X= 1712/57.20
X= 41.9g of oxygen
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When a metal was exposed to photons at a frequency of 1.34×1015 s−1,
electrons were emitted with a maximum kinetic energy of 3.60×10−19 J.
Calculate the work function, Φ,
of this metal.
Φ=
J/photon
What is the maximum number of electrons that could be ejected from this metal by a burst of photons (at some other frequency) with a total energy of 3.67×10−7 J?
number of electrons:
The work function of the metal is 5.2 * 10^-19 J while the number of electrons is 2.3 * 10^12 electrons.
What is the work function?From the photoelectric theory of Einstein, electrons are emitted when light of appropriate wavelength is incident on a clean metal surface. The minimum energy that the incident light must possess is called the work function of the metal.
We know that;
Kinetic energy = Energy of incident photon - Work function
Energy of incident photon = hf = 6.6 * 10^-34 Js * 1.34×10^15 s−1
= 8.8 * 10^-19 J
Work function = Energy of incident photon - Kinetic energy
Work function = 8.8 * 10^-19 J - 3.60×10^−19 J
Work function = 5.2 * 10^-19 J
Now;
The total energy = 3.67×10−7 J
Hence;
3.67×10−7 J = n * 1.6 * 10^-19 J
n = 3.67×10−7 J/1.6 * 10^-19 J
n = 2.3 * 10^12 electrons
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Which element has 3 valence electrons and 3 energy levels?
Answer:
aluminum has 3 energy levels and 3 valance electrons
Calculate how much 95thyl alcohol is required to dissolve 075 g sulfanilamidwe at 78 degrees celsius
3.57 ml of 95% ethyl alcohol will be required to dissolve 0.75 g sulphanilamide at 78 degrees Celsius.
ExplanationLets convert sulphanilamide into mg
m(sulphanilamide) = 0.75 g
= 0.75 × 1000
= 750 mg.
We know that,
210 mg : 1 ml = 750 mg : V(ethyl alcohol).
By simplifying
210 mg × V(ethyl alcohol) = 750 ml × mg.
V(ethyl alcohol) = 3.57 ml
Thus, 3.57 ml of 95% ethyl alcohol will be required.
What is sulphanilamide?Sulfanilamide is a sulfonamide antibacterial medication that can also be spelt as sulphanilamide. It is an organic compound made composed of an aniline that has been sulfonamide-derivatized. In World War II, the Allies utilized powdered sulfanilamide to lower infection rates, which also helped to significantly lower mortality rates than in earlier conflicts.
Due to its toxicity and the availability of more potent sulfonamides for this function, sulfanilamide is seldom ever administered systemically. Sulfanilamide has been replaced by modern antibiotics on the battlefield, but it is still used today in topical formulations, primarily for treating vulvovaginitis, a vaginal yeast infection caused by Candida albicans.
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HELP ASAP PLEASEEEEEEEEE!
The respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:
Na - 11, 23, 11, 11, 12S - 16, 32, 16, 16, 16Ag (silver) - 47, 108, 47, 47, 61Au (gold) - 79, 197, 79, 79, 118What is atomic number?The atomic number of an element is the number of protons in the atom of that element. In a neutral atom, the number of protons is same as the number of electrons.
However, the mass number is the sum of the number of protons and neutrons in the atom.
This means that we can get the number of neutrons in an atom of an element by subtracting the number of protons/atomic number from the mass number.
Therefore, based on the above explanation, the respective atomic number, mass number, protons, electrons and neutrons of the following atoms are as follows:
Na - 11, 23, 11, 11, 12S - 16, 32, 16, 16, 16Ag (silver) - 47, 108, 47, 47, 61Au (gold) - 79, 197, 79, 79, 118Learn more about atomic number at: https://brainly.com/question/16858932
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What was the mass of the ethanol plus the graduated cylinder when 20.0 ml of ethanol was added? choose the closest answer.
The mass of the ethanol + graduated cylinder would be 90.33 g.
Density of 20 ml ethanol is = 0.789 g/ml
As we know that density = mass UPON volume
so mass = density * volume
mass = 0.789 g/ml * 20 ml
mass = 15.78 g
If we try to get the volume of water in the experiment it will be 8.9 ml
Mass of graduated cylinder = 29.13 g
Mass of cylinder and mass = 36.33 g
If we combine all the masses we'll get 90.33 g.
Hence, the answer is 90.33 g.
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truction
Check
A
Active
Identifying Parts of an Atom
B
Identify the parts of the atom that are labeled in the
diagram.
Label A:
Label B:
science
Answer:
a nucles
b electron cloud
Explanation:
What potential problems with the test did the success of ELIZA and PARRY reveal?
The success of ELIZA and PARRY reveal is Humans attribute intelligence to things that are not actually intelligent.
What are attributes of intelligence?There are various ways to describe intelligence, including higher level skills (including abstract reasoning, mental modeling, decision-making, and problem-solving), the capacity for learning, emotional intelligence, creative thinking, and environment-appropriate adaptation. Because creativity goes beyond knowledge recall and includes knowledge invention, it is the ultimate type of intellect.
What are the 4 types of intelligence?Gardner proposes that people have multiple types of intelligence, including musical, interpersonal, spatial-visual, and linguistic intelligences, to fully account for the diversity of skills and talents that people possess.
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Relative to other substances, water tends to resist changes in temperature. Why?.
Water is highly cohesive. Its molecules tend to resist increases in their motion.
Explanation:When water is heated, some of the energy is used to disturb the hydrogen bonds between neighboring molecules.
Water is abundant. Large bodies of water resist changes in their temperature simply because they are massive objects.
Water is highly cohesive. Its molecules tend to resist increases in their motion.
Due to its extreme density, water can absorb a lot of heat with only a small change in temperature, much like all other dense materials.
Water is very sticky. If water is bonded to another substance, the molecules will tend to "stay put" and resist increases in motion.
Pure water does not resist temperature change.
The hydrogen bonds between water molecules give water the ability to hold heat better than many other substances.
As the temperature rises, the hydrogen bonds between water continually break and reform, allowing for the overall temperature to remain stable, although increased energy is added to the system.
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Relative to other substances, water tends to resist changes in temperature because it's highly cohesive.
What is cohesion?The linguistic concept of cohesion describes the way that a sentence's or a text's structure and content are connected to produce meaning.
The gravitational force that draws molecules of a given material together.
Solids, it is the most powerful, followed by liquids and gases, which are less powerful.
The interactions of water molecules with one another and with other objects, such as leaves or even you, are described by the two water properties of cohesion and adhesion.
Both cohesion and adhesion refer to how much water prefers to attach to itself and other objects.
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Lithium is the least dense metal know with a density of 0.53 g/cm³. What is the volume occupied by 1.20x10³ grams of lithium
Answer:
2264.15 cm³Explanation:
The formula for finding the volume of an object given it's mass and density is given by
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass = 1.2 × 10³ grams
density = 0.53 g/cm³
We have
[tex]volume = \frac{1.2 \times {10}^{3} }{0.53} = 2264.1509\\ [/tex]
We have the final answer as
2264.15 cm³
Hope this helps you
a 8.638.63 g sample of calcium sulfide was decomposed into its constituent elements, producing 4.804.80 g of calcium and 3.833.83 g of sulfur. which of the statements are consistent with the law of constant composition (definite proportions)?
An 8.638.63 g sample of calcium sulfide was decomposed into its constituent elements and the statement is that every sample of calcium sulfide will have 44.4% mass of sulfur.
Law of Constant compositionAccording to the law of definite proportions, which is also known as the law of constant composition, pure compound samples always contain the same elements in the same mass proportion.
Stoichiometry in chemistry is also based on this concept and also the law of multiple proportions.
Every sample of a given chemical composition will consist of the same elements in the same combination or ratio.
The statements and percentage can be calculated asIt is given that,
an 8.638g sample was decomposed into its constituents.
It is producing a total of 4.804g calcium and 3.833g of sulfur.
The mass ratio of Ca: s = 4.804/3.833
=1.253
⇒ mass of calcium = 40.078
mass of sulfur = 32.068
Total mass of CaS = 72.146 grams
mass percentage of Ca = 40.078/72.146 x 100
=55.56%
mass percentage of S = 32.068/72.146 x 100
=44.44%
Thus, in each kind of sample the mass percentage of calcium along with sulfur in every sample is equal to 100%.
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Complete Question
A 8.63 gg sample of calcium sulfide was decomposed into its constituent elements, producing 4.804 g of calcium and 3.833 g of sulfur.
Which of the statements are consistent with the law of constant composition (definite proportions)?
A) Every sample of calcium sulfide will have 3.36 g of calcium.
B) The mass ratio of Sto Ca in every sample of calcium sulfde is 0.80.
C) The ratio of calcium to sulfur will vary based on how the sample was prepared.
D) Every sample of calcium sulfide will have 44.4% mass of sulfur.
E) The mass percentage of calcium plus the mass percentage of sulfur in every sample of calcium sulfide equals 100%.
1. Identify the number of significant figures in the measurements below.
Measurement
a)
1000 g
b)
20.1 cm
c) 0.00001 m
d)
1.06 s
e) 5003 mL
f)
g) 10890 kg
h) 100.0 cm²
i) 0.00800 s
j)
0.002700 L
50 students
Significant Figures
Answer:
a) 4
b) 3
c) 1
d) 3
e) 4
f) 0
g) 5
h) 3
i) 3
j) 4
50 students has 2.
Hope that helps
A piece of metal is placed in a clear solution. Bubbles form and the metal disappears. The mass of the final solution is less than the mass of the
first solution and the metal. Is this an exception to the law of conservation of mass? Explain.
Metals on reaction with acids liberate Hydrogen gas. This is the reason why bubbles are formed in the solution.
When the metals reacts with acids the mass of the metal will decreases with the liberation of hydrogen gas . This can acts as a exception for law of conservation of mass.
What is law of conservation mass?The law of conservation of mass determines that in a chemical reaction mass can neither be created nor destroyed. For instance , the carbon atom in coal as carbon dioxide when it is burned. The carbon atom transforms from a solid structure to a gas but its mass doesn't changes.
Does mass increase or decrease after a chemical reaction?The principle states that the mass of matter, in a closed system, will always be the same no matter what type of change can happens to the matter. Whether it's a change in state, or dissolving, or a chemical reaction, or any combination , the amount of mass will not be change.
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Ammonia reacts with hydrogen chloride in the gas phase to produce the ionic compound ammonium chloride via the reaction nh3(g) hcl(g) âž"" nh4cl(s). what is the percent yield of ammonium chloride if 0.81 g of nh4cl is formed when 0.75 g of nh3 is reacted with 0.62 g hcl?
The percentage yield of ammonium chloride of 0.81 g of N[tex]H_{4}[/tex]Cl is formed when 0.75 g of N[tex]H_{3}[/tex] is reacted with 0.6 g HCl is 89%.
How do we calculate the yield percentage of any substance?
The weight of the product that was produced compared to the theoretical yield is known as the percent yield in chemistry. In order to express the result in percent, we divide the experimental yield by the theoretical yield and multiply the result by 100.
Given that,
N[tex]H_{3}[/tex](g) + HCl(g) = N[tex]H_{4}[/tex]Cl ,
0.81 g N[tex]H_{4}[/tex]Cl,
0.75 g of N[tex]H_{3}[/tex],
0.6 g of HCl,
% of N[tex]H_{4}[/tex]Cl = ?
Molar mass of N[tex]H_{3}[/tex] = 14 + (1×3) = 17 g/mol (since N = 14, H =1)
Molar mass of HCl = 35.5 + 1 = 36.5 g/mol (since H=1, Cl=35.5)
Molar mass of N[tex]H_{4}[/tex]Cl = 14×4 + 35.5 = 53.5 g/mol
Mole of N[tex]H_{3}[/tex] = 0.75/17 = 0.0441 mol
Mole of HCl = 0.62/36.5 = 0.0169 mol
Therefore 0.0169 mol of N[tex]H_{4}[/tex]Cl will be formed since limiting reactant is HCl.
1 mol N[tex]H_{4}[/tex]Cl = 53.5 g
0.0169 mol N[tex]H_{4}[/tex]Cl = (53.5×0.0169)g
= 0.904 g
Percentage yield of N[tex]H_{4}[/tex]Cl = (N[tex]H_{4}[/tex]Cl formed / Theoretical N[tex]H_{4}[/tex]Cl product)× 100
= (0.81/0.904)×100
= 89.6%
Therefore, the yield percentage of N[tex]H_{4}[/tex]Cl is 89%.
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The complete question is :
“Ammonia Reacts With Hydrogen Chloride In The Gas Phase To Produce The Ionic Compound Ammonium Chloride Via The Reaction NH3(G) + HCl(G) ➔ NH4Cl(S). What Is The Percent Yield Of Ammonium Chloride If 0.81 G Of NH4Cl Is Formed When 0.75 G Of NH3 Is Reacted With 0.62 G HCl? 91% 34% 89% 59%”
A continental polar air mass moves into an area. based on the characteristics of this type of air mass, which changes are most likely to happen in the area?
The change that is likely to occur is that :
The temperature will decrease and humidity will increase.
What is a continental polar air mass?Continental Polar air masses are air masses that are cold and dry due to their continental source region.
When a continental polar air mass moves into an area, the following will happen:
The temperature will decrease and humidity will increase.maritime polarmaritime tropicala warmer air mass moves into the area and rises.maritime polarContinental air masses are characterized by dry air near the surface while maritime air masses are moist.
Continental polar air masses are also characterized by cold, dry, and stable but they are not as cold as the artic air masses.
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According to the linear model of mass communication, an advertisement for cereal is an example of a:______
According to the linear model of mass communication, an advertisement for cereal is an example of a message.
What do you mean by mass communication?The process of developing, sending, receiving, and analyzing messages for large audiences through spoken and written media is known as mass communication (or communications). It is a broad field that takes into account both the means by which a communication is created and its intended audience. These media span a variety of platforms and include print, social media, digital and Internet media, radio, and television. Strategic communication, health communication, political communication, integrated marketing communications, journalism, and other related professions are all included in the multidisciplinary aspect of mass communication.
There are various bachelor's and master's in mass communication programs provided by colleges and universities across the country for those who are interested in working in public communication or studying it as a topic of study.
The development, dissemination, and evaluation of effective communications aimed at sizable audiences is the domain of mass communication specialists who are knowledgeable in rhetorical principles and strategic media tactics.
Every day, mass communication strategies are used by public relations specialists, journalists, broadcast professionals, advertisers and marketers, content writers, graphic designers and illustrators, public health educators, corporate media managers, and other media professionals to create and implement strategic communication plans — from broadcast news to online marketing campaigns and public health announcements — across almost every industry.
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Draw the structure of the addition polymer made from styrene monomers
(show at least three repeating units in your structure).
Polystyrene is produced from by addition polymerization for styrene monomers as shown in the image attached to this answer.
What is a polymer?A polymer is a substance that is formed by the joining together of several smaller molecules. We know that polymers are composed of smaller molecules called the monomers. The monomers are the singe units that could be joined together when we are trying to obtain a polymer. Monomers could have a very short chain in themselves. The chemical composition of the monomer is what determines the sort of polymer that it could form.
We can see in the image attached, both the structure of the styrene monomer and that of the polystyrene polymer. Thee polymer if formed by addition and occurs by the mechanism of free radical polymerization. This means that the initiator of the polymerization must be a free radical.
Polystyrene is used in materials such as disposable cutlery , compact disk plates and plastic frames.
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If you were given five unknown substances and were
asked to describe them by their physical properties, what would
you look for? What should you not do while observing their
physical properties?
If you were given five new substances and were asked to describe them by their physical properties, the following listed below will be looked out for:
Color
Density,
Hardness
Odor etc.
What is Physical property?
This is the type of features of the matter which can be measured without changing the chemical identity of it or the constituents.
Examples of physical properties include color, odor, boiling and melting points etc which are usually often seen or felt by individuals depending on the type of substance. This is therefore the reason why the above parameters will be considered in the case of the physical properties.
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Which family on the periodic table has the highest effective nuclear charge
O Halogens
O Noble gases
O Alkaline earth metals
Alkali metals
The noble gases family on the periodic table has the highest effective nuclear charge as compared to other groups in the periodic table.
What does greatest effective nuclear charge mean?A higher effective nuclear charge leads to greater attractions to the electrons which results in pulling of electron closer to the nucleus which causes in a smaller atomic radius of the atom. When we move down the group, the number of shells or orbits increases, so there is a greater distance between the nucleus and the outermost shell. Effective nuclear charge increases when we move from left to right in the periodic table due to the increasing of atomic charge and shielding effect. Due of a same number of shielding electrons across a period, the valence electrons are pulled more strongly by the protons present in the nucleus. Effective nuclear charge increases when we move from left to right in the periodic table while on the other hand, effective nuclear charge decreases down the group in the periodic table.
So we can conclude that the noble gases family on the periodic table has the highest effective nuclear charge as compared to other groups in the periodic table.
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In normal tissue, the
A rate of mitosis is equal to the rate of apoptosis
B rate of mitosis is much greater than the rate of apoptosis
C rate of mitosis is less than the rate of apoptosis
D rate of mitosis and apoptosis will be zero
Please i need answr rn
Answer:
B. The rate of mitosis is much greater than the rate of apoptosis
the freezing point of a cyclohexane sample is 6.20 °c. a solution is prepared by dissolving 0.4660 g of an unknown solute in 36.0 g cyclohexane. the freezing point of the resulting solution is 4.11 °c.
The answer of the resulting Freezing point of the solution is 123.87 g
Molality is a measure of the number of intelligence of solute in a result corresponding to 1 kg or 1000 g of detergent.
This contrast with the description of molarity which grounded on a specified volume of result.
A generally used unit for molality in chemistry is mol / kg.
Now,
Molar mass of an unknown solid = ?
ΔTf = kf * molality for finding molality
Molality = moles / kg solvent
Moles = grams / molar mass
Mass of solute mixed in cyclohexane = 0.4 × 609
Solute mixed in cyclohexane and mixed in cycloheptene= 0.4² × 1000 / 36 π
ΔTf = kf * molality
ΔTf = 2.0920 × 0.4 × 1004 ÷36 × 0.09
M = 9320 / 73.29
M = 123.87 g
Molar mass of unknown solvent = 123.87 g
The Freezing point of the resulting solution is 123.87 g and hence the answer is 123.87 g
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Use the factor label method and determine the number of grams of water present in 55.89g of CoCl•6H2O
The mass (in grams) of water, H₂O present in 55.89g of CoCl•6H₂O is 29.82 g
How to determine the mass of water, H₂OWe can obtain the mass of water in 55.89 g of CoCl•6H₂O as illustrated below:
Molar mass of CoCl•6H₂O = 58.9 + 35.5 + 6[(2×1) + 16] = 94.4 + 6[18] = 202.4 g/molMolar mass of water, H₂O = (2×1) + 16 = 18 g/molMass of CoCl•6H₂O = 55.89 gMass of water, H₂O =?Mass of water = (6H₂O / CoCl•6H₂O) × total mass
Mass of water = [(6 × 18) / 202.4] × 55.89
Mass of water = [108 / 202.4] × 55.89
Mass of water = 29.82 g
From the calculation made above, we can conclude that the mass of water in the 55.89 g of CoCl•6H₂O is 29.82 g
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