Answer:
2.59 × 10^-3
move the decimal 3 spots to the right
What do you notice about the names of the cations and anions on the cards. How do they compare with the name of the neutral atom or element? Do the non-metals have anything in common about their name?
Identify the type of solid for ice. networking atomic solid molecular solid nonbonding atomic solid ionic solid metallic atomic solid
Molecular Solid can be described as the solid type for ice where the molecules are held together with low intermolecular force to form such kind of solids.
What qualifies as a molecular solid?Van der Waals forces hold molecules together to form molecular solids. These intermolecular forces are weak, which controls its characteristics. Molecular solids are electrical insulators, soft, frequently volatile, and have low melting temperatures.
What sort of molecular solid is that?Molecular solids are composed of atoms or molecules bound together by hydrogen bonds, London dispersion forces, or dipole-dipole forces. Characterized by weak conductivity, flexibility, and low melting points. Sucrose is a type of molecular solid.
What exactly does molecular solid mean?A solid made up of distinct molecules is referred to as a molecular solid. Molecular solids can be either soft or rigid.
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Complete Question
Identify the type of solid for ice.
A) Nonbonding atomic solid
B) Metallic atomic solid
C) Molecular solid
D) Ionic solid networking atomic solid
When viewing the euglena in lab, you should be able to positively identify the _________ and __________.
When viewing the euglena in lab, we should be able to positively identify the chloroplast and stigma.
What is chloroplast?Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via photosynthetic process. By doing so, they sustain life on the Earth. Chloroplasts also provide diverse metabolic activities for the plant cells, including the synthesis of fatty acids, membrane lipids,
Chloroplasts are a type of plastid—round, oval, or disk-shaped body that is involved in synthesis and storage of foodstuffs. Chloroplasts are distinguished from other types of the plastids by their green color, which results from the presence of two pigments, chlorophyll a and chlorophyll b. A function of those pigments is to absorb light energy for process of photosynthesis.
Other pigments, such as carotenoids, are also present in the chloroplasts and serve as accessory pigments, trapping solar energy and passing it to chlorophyll. In plants, chloroplasts occur in all the green tissues, though they are concentrated particularly in the parenchyma cells of the leaf mesophyll.
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How many hours are there in a fortnight if a fortnight equals two weeks?
1 week= 7 days
1 day=24 hours
A compound consists of 37. 51 g c, 4. 20 g h, and 58. 29 g o. What is the empirical formula?.
The empirical formula is C6H8O7.
What is an empirical formula?A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms, is known as empirical formula.
This can be done by calculating molar ratio of elements using masses and molar masses of the element.
Mass of Carbon (C) in given compound is= 37.51g
Mass of Hydrogen (H) in the given compound is= 4.20g
Mass of Oxygen (O) in given compound is= 58.29g
Molar mass of C = 12.0107g
Molar mass of H = 1.00784g
Molar mass of O = 15.999g
by diving the mass of elements with their respective molar masses we get the number of moles of elements:
no. of moles of C= 37.51/12= 3.123moles
no. of moles of H= 4.20/1.00784 =4.167moles
no. of moles of O = 58.29/15.999 = 3.643moles
The Molar ratio of elements/atoms can be obtained by diving the above number of moles with the lesser number of moles in the above three,
C= 3.123/3.123
H= 4.167/3.123
O= 3.653/3.123
By multiplying each ratio with '6' we get the whole number.
C= 1*6
H= 1.334*6
O= 1.166*6
The empirical formula is= C6H8O7.
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The empirical formula is [tex]C_{6} H_{8} O_{7}[/tex].
What is an empirical formula in chemistry?The relative atomic ratios in a compound are given by an empirical formula.
The chemical formula of a compound that gives the proportions (ratios) of the elements present in the complex but not the precise number or arrangement of atoms is known as an empirical formula.
This would be the compound's element-to-whole number ratio with the lowest value.
The ratios also hold true at the molar level.
Eg: The chemical structure of glucose is C6H12O6. Every mole of carbon and oxygen is accompanied by two moles of hydrogen. Glucose has the empirical formula CH2O.
Ribose has the chemical formula C5H10O5, which can be simplified to the empirical formula CH2O.
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Does a size separation technique make sense for separation of one soluble and one insoluble salt?.
NO, a size separation technique does not make sense for separation of one soluble and one insoluble salt.
To separate one soluble and insoluble salt, techniques of solvent extraction and evaporation, crystallization are used. Among these, evaporation is the best technique to separate the salts.
Size separation techniques sieving, sifting, and screening. These are used on the basis of differences in size, shape, and density between particles.
The technique of evaporation is used. The mixture of the two soluble and insoluble salts are added to water. The soluble salt is allowed to dissolve and the insoluble salt is filtered out. The soluble salt can be obtained by evaporating with water.
This method involves four stages :
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At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then what is the % salicylic acid impurity in your aspirin?.
At the end of the experiment you will be assessing the purity of your aspirin by measuring its absorbance at 525 nm. If the absorbance measurement is found to be 0. 040 then the % salicylic acid impurity in your aspirin will be 7.8 percent.
According to the inquiry, the sample solution's absorbance (A) is 1.07. Beer's law, which states that A = ebc, is used to calculate the aspirin concentration.
Here, b is the route length, which is equal to 1 cm, and e is the extinction coefficient, which is equal to 139.322 M-1cm-1 based on the salicylic acid standard value. Having established our ideals,
A = ebc
c = A / (eb)
c = 1.07 / (139.322 × 1)
c = 0.00768 M
To establish the percentage of salicylic acid in the sample, it is now necessary to compare the value of concentration calculated with the concentration of aspirin previously administered.
The question mentions that the starting concentration of aspirin is 0.02 grammes. The molar mass of aspirin is 240 g/mol.
The aspirin molecules will therefore be,
0.02 / 240 = 8.33 × 10^-5 moles
The final volume of the diluted solution given is 10 ml or 0.01 liters.
The molarity of aspirin in the diluted solution will be,
c1 = 8.33 × 10^-5 / 0.01 = 8.33 × 10^-3 M or 0.00833 M
Now, the percent of salicylic acid in the product will be,
c1 - c / c1 × 100
(0.00833 - 0.00768) / 0.00833 × 100 = 7.8 %
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a box has two forces acting on it. one force is 100 n upward. another force is 50ndownward. what is the net force on the box?
The net force on the box would be 50 N in the upward direction.
What is a net force?The net force acting on an object is the resultant force acting on the object.
The net force acting on an object is the sum total of all the forces acting on the object. This is when the direction of the forces is put into consideration.
In the present problem, two forces are acting on the object. These two forces are antagonistic. One force is in the upward direction while the other is in the downward direction.
The resultant force can be calculated as:
100 N - 50 N = 50 N
Now, this resultant force is in the upward direction.
In other words, the net force on the object is 50 N in the upward direction.
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Imagine that you are standing at the center of a giant bowl of gelatin. What type of wave will you make across the top of the gelatin if you jump up and down? Explain your answer.
Transverse waves will be made across the top of the gelatin if you jump up and down.
Transverse waves are waves that oscillate along routes that are perpendicular to the direction in which the wave is moving forward. Examples of transverse waves include electromagnetic waves, seismic S waves, and water surface ripples. Particles in a transverse wave oscillate up and down about their mean location rather than following the wave's path of transmission.
A transverse wave is one in which each particle of the medium moves around its mean location in a direction that is the opposite of the direction in which the wave is propagating. Transverse waves are what makeup light. Only solids and the surface of liquids may generate transverse waves. They are unable to be created inside liquids or gases.
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Which type of property?
Temperature: The amount of heat in a substance. It is measured in degrees. For
example: "This water sample has a temperature of 32 degrees Celsius."
O intensive property
O extensive property
Temperature is an intensive property.
A property of matter that is intensive depends solely on the kind of matter in a sample and not on the quantity.An intensive property is a property that does not depend on the amount taken. It is the same whether we take a small sample of it or a large sample of it.On the other hand, an extensive property is a property that does depend on the amount it has been taken into consideration.Temperature, similar to pressure or density, is called an intensive property—one that is independent of the quantity of matter being considered—as distinguished from extensive properties, such as mass or volume.To learn more about intensive property visit:
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how does water's polarity help it to dissolve so many substances? (3 points) water's polarity allows it to form covalent bonds with many different substances. water's polarity increases its ability to form ionic bonds with ions and hydrocarbons. water's oppositely-charged ends are attracted to charged ions and polar molecules. water's oppositely-charged ends are able to interact with and dissolve hydrophobic substances.
Water's polarity help it to dissolve so many substances as water's oppositely charged ends are attracted to other charged ions and polar molecules.
water's polarity allows it to form covalent bonds with many substances because of water bent shape. it gives oxygen atom partial negative charge and hydrogen atom partial negative charge .the positive part attract and pull of negative part solute and the negative part attract and pull of positive part of solute.
Hydrocarbons are non polar molecule , they do not dissolve in polar solvent like water. so, water's polarity does not increases its ability to form ionic bond with ions and hydrocarbons.
Hydrophobic means water - fearing . this means the hydrophobic substances donot dissolve in water.
Thus, Water's polarity help it to dissolve so many substances as water's oppositely charged ends are attracted to other charged ions and polar molecules. hydrocarbons and hydrophobic substance do not dissolved in water.
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A buffer is prepared which contains 0. 10 m nitrous acid, hno2, and 0. 12 m sodium nitrite, nano2. (ka=4. 5x10-4) calculate the ph after 0. 019 mol of naoh is added to 1. 00 l of the buffer
The pH value of the given buffer system after the addition of 0.019 mol of NaOH is 3.58.
To determine the pH of a buffer system, we use the Henderson-Hasselbalch equation:
[tex]pH = pK_{a} + log\frac{[base]}{[acid]}[/tex]
In our case, the base is sodium nitrite, while the acid is nitrous acid. Upon addition of NaOH, the added base will react with the acid, neutralizing it and turning it into sodium nitrite. We need to calculate how much acid and base we will have after the addition of NaOH:
[tex]n_{NaNO_{2} } = 1 L * 0.12 M + 0.019 mol = 0.139 mol[/tex]
[tex]n_{HNO_{2} } = 1 L * 0.10 M - 0.019 mol = 0.081 mol[/tex]
Because the volume of the solution is the same for both components, we don't need to calculate the actual concentrations and can just plug in the moles in the Henderson-Hasselbalch equation:
[tex]pH = -log(4.5 x 10^{-4}) + log\frac{0.139 mol}{0.081 mol} = 3.35 + log1.716 = 3.58[/tex]
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Please help asap please. thanks :)
Answer:
phosphorus (P)
Explanation:
this is because when we add
2+2+6+2+3
we get 15
15 is also the atomic number so when we check the periodic table, we know phosphorus has an atomic number of 15 therefore the answer is phosphorus.
A specific nitrogen atom has 7 protons and 6 neutrons if this is neutral atom how many electrons does the atom have
Nitrogen atom have 7 electrons.
Is it possible for nitrogen to have seven electrons?Nitrogen is the seventh element, with seven electrons. The first two electrons in the electron configuration for nitrogen will be in the 1s orbital. Because the 1s orbital can only hold two electrons, the next two electrons for N are placed in the 2s orbital.When one shell is full, the next electron must move to the next shell. So you already know that the atomic number of NITROGEN tells you the number of electrons. That means a nitrogen atom has 7 electrons.The number of protons in a neutral atom equals the number of electrons. The atom's mass number (M) equals the sum of the number of protons and neutrons in the nucleus. The number of neutrons equals the difference between the atomic mass number (M) and the atomic number (Z).Protons are subatomic particles that have a positive charge. The strong nuclear force holds protons together in the nucleus of an atom. Neutrons are non-charged subatomic particles (they are neutral).
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Based on the solubility observations, which of the following pairs of cations could be differentiated by the addition of sodium chloride to the solutions?
The pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.
Which solution can be distinguished?We know that an ionic solution is composed of ions. The ions in a solution are capable of interacting with reagents and this is the basis for the qualitative identification of ions in a solutions.
Now let us look at the options, we are going to look out for the option in which the addition of the chloride ion would lead to the emergence of a precipitate in the solution.
If we consider the solutions properly, we would see that the pairs of cations could be differentiated by the addition of sodium chloride to the solutions are barium and lead.
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Missing parts;
Based on the solubility observations, which of the following pairs of cations could be distinguished by the addition of sodium chloride to the solutions?
Choose..
barium and lead
barium and aluminum
lead and silver
iron and calcium.
The km of an enzyme is 5. 0 mm. Calculate the substrate concentration when this enzyme operates at one‑quarter of its maximum rate.
The substrate concentration of the enzyme operating at one‑quarter of its maximum rate is = 0.333.
Relationship between Km and substrate concentration is -
Km is the concentration of substrate.It allows the enzyme to achieve half Vmax. High Km enzyme requires a higher concentration of substrate to get Vmax. Since, Km is a constant. If the substrate concentration is increased, it has no effect on it.
An enzyme with a high Km has a low affinity for its substrate. The substrate concentration Km corresponds to the substrate concentration.
The substrate concentration at which the reaction rate of the enzyme-catalyzed reaction is half of the maximum reaction rate Vmax.
The equation is:
V₀ = Vmax [S]
[S] + Km
Here,
V₀ is initial rate,
Km is the dissociation constant between the substrate and the enzyme,
Vmax is the maximum rate, and
S is the concentration of substrate.
taking fraction of V₀ and Vmax :
V₀ = [S]
Vmax [S] + Km
V₀ = 0.5Km = 0.333
Vmax 1.50 + Km
Therefore, the substrate concentration of this enzyme operating at one‑quarter of its maximum rate is = 0.333.
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Answer quick cause its time
How do gamma rays differ from alpha particles and beta particles?
a)How do gamma rays differ from alpha particles and beta particles?
b)Gamma rays and alpha particles result in the formation of new atoms, but beta particles do not.
c)Alpha particle and beta particle emissions result in the formation of new atoms, whereas gamma ray emissions do not.
d)Gamma rays have mass, whereas alpha and beta particles do not.
Answer:
While alpha and beta rays have energy and mass, gamma rays are pure energy.
the solubility of glucose at 30°c is 125 g/100 g water. a solution is made by adding 250 g of glucose to 100 ml of water at 30°c. remember that 1 g water
The solubility of glucose is classified as a Supersaturated solution that is made by adding glucose to water at varying amounts for various compounds.
What do you mean by solubility?The maximum amount of the chemical that will get to dissolve in a given amount of solvent at a given temperature is referred to as the solubility of that solution. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair.
What does solubility mean in a nutshell?The creation of a new bond that is between the molecules of the solute and the solvent is known as the solubility. Solubility means the greatest amount of solute that can be dissolved in a known amount of solvent at a specific temperature.
Why is solubility in water important?The quantity of a chemical that can dissolve in water at a particular temperature is known as its water solubility. It is customary to measure solubility in mg/L (milligrams per liter) or ppm (parts per million).
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Complete Question
The solubility of glucose at 30°c is 125 g/100 g water. A solution is made by adding 250 g of glucose to 100 ml of water at 30°c. Remember that 1 g water = 1 ml water. How would you classify this type of solution?
A) heterogeneous
B) saturated
C) supersaturated
d) unsaturated.
An atom has 8 protons, 9 neutrons, and 8 electrons. this atom has an atomic number of?
An atom has 8 protons, 9 neutrons, and 8 electrons then atomic number will be 8.
Proton can be defined as the particle which present in nucleus. it has positive charge.
Atomic number can be determined by the count of proton which occur in a particular atom.
It can be written as:
Number of proton = atomic number
8 = atomic number.
It is mentioned that the count of proton is 8 hence, the atomic number will be 8.
By adding count of protons and count of neutron, atomic mass can be calculated.
Therefore, atomic number will be 8.
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I have no idea, it’s circle answer, anyone know?
why you think your claim is the best explanation for Jordan Jones’s improved performance.
Referring below mentioned assertions,
Claim 1: Jordan Jones used blood doping to accelerate his cellular respiration and boost his performance.
Claim 2: By altering his pre-race diet, Jordan Jones boosted his cellular respiration and overall performance.
Claim 3: By practicing at a greater altitude, Jordan Jones raised his cellular respiration and enhanced his performance.
The assertion that Jordan Jones trained at a greater altitude improved his performance and boosted cellular respiration is the strongest.Cycling is a widely popular sport, particularly in the US. There are now numerous cycling federations that organize competitions all over the world, making the sport more well-known.People who take part in athletic competitions frequently train at high altitudes.Therefore, the strongest claim is that Jordan Jones trained at a greater altitude, which enhanced his cellular respiration and improved his performance.
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a. The rocks that make up the crust are relatively cold and ________________
The rocks that make up the crust are relatively cold and composed of igneous, metamorphic, and sedimentary rocks.
The outermost layer of a terrestrial planet is referred to as its "crust." All known life in the universe is contained in the thin, 40 km (25 mi) deep crust of our planet, which makes up just 1% of the planet's mass.
The crust, mantle, and core are the three layers that make up the earth. Minerals and solid rocks make up the crust. The mantle, which lies below the crust, is composed primarily of solid rocks and minerals with some malleable regions of semi-solid magma. There is a hot, dense metal core at the center of the Earth.
Rocks from igneous, metamorphic, and sedimentary types make up the crust of the Earth. Igneous rocks, which are created when magma cools, are the most prevalent types of rocks in the crust. Igneous rocks such as granite and basalt are abundant in the crust of the Earth.
Hence, the rocks that make up the crust are relatively cold and composed of igneous, metamorphic, and sedimentary rocks.
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a monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2. the density of oleic acid is 0.895 g / ml. what is the thickness of the monolayer (the length of an oleic acid molecule)? 5.69×10-5 cm 1.42×10-7 cm 7.11×10-5 cm 5.63×10-6 cm 1.78×10-7 cm
a monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2. the density of oleic acid is 0.895 g / ml 1.78×10-7 cm is the thickness of the monolayer
Here given data is monolayer containing 3.18×10-6 g of oleic acid has an area of 20.0 cm2 and the given density of oleic acid is 0.895 g / ml and we have to find thickness of the monolayer=?
So from the information provided we have to calculate volume of monolayer hence, the thickness
Therefore volume=area × height
So given density = mass/volume
0.895 g / ml=3.18×10-6 g × x ml
X ml = 3.18×10-6 g / 0.895 g / ml = 0.35×10⁻⁵cm2
Volume of monolayer, volume = area × thickness so thickness = volume/area
0.35×10⁻⁵cm2 / 20.0 cm2 = 1.78×10-7 cm
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if a compound is pure, the melting point should be... close to the expected value and very narrow (1-2°c) saved thinking about the affect of impurities... (0.5pts) if a compound is impure, containing traces of starting material or byproduct, the melting point is expected to be... close to the expected value and broad saved (0.5pts) if a compound is wet with water or residual solvent, the melting point is expected to be...
if a compound is pure, melting point should be close to the expected value and very narrow (1-2°c).
if a compound is impure, containing traces of starting material or byproduct, melting point is expected to be lower than the expected range and broad.
if a compound is wet with water or residual solvent, melting point is expected to be lower than the expected range and broad.
What is the difference between pure compound and impure compound?In simple terms, matter can be defined as anything and everything that has mass and occupies space. Everything from air you breathe, the water you drink, or the clothes you wear comes under the category of matter. It is made up of an elementary particle referred to as an atom. A further matter is subdivided into two the primary categories which are –
Pure substances Impure substancesPure and impure substances are different from one another and have the distinctive characteristics. Now, let’s look into them in the detail to get a clear understanding of Characteristics of a pure and impure substances.
When single types of atoms are combined together, it results in the formation of the pure substances. As a result, these substances possess the homogeneous chemical compositions and hold a fixed structure and chemical properties.
Impure substances, also known as the mixtures, are another type of matter formed through different kinds of molecules or atoms. The stature of these is not fixed or constant, unlike the pure substances. They can be broken down into the pure substances with the help of purification methods such as sublimation, filtration, crystallization, and so on.
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Based on the successive ionization energies for the following element "X", predict the formula that would be formed when "X" reacts with chlorine, Cl.
Based on the successive ionization energies, the formula that would be formed when "X" reacts with chlorine, Cl is XCl.
Since it is seen that there is a large gap in energy difference in second ionization energies ( from 577 to 1820), which means that the valance electron in the given element X is 1. So, the formula will be X⁺ and Cl⁻ is XCl.
Successive ionization strength is described because of the energy this is required to cast off the electron one after the alternative. Successive ionization power will rely on the range of electrons gift in the outermost shell.
Successive ionization energies boom in value due to the fact the variety of electrons, which purpose repulsion, progressively lower. This isn't always a smooth curve there may be a large leap in ionization power after the atom has misplaced its valence electrons.
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i. If a solution of formic acid contains 0.2 MHCHO2, 0.006 M CHO₂, and 0.006 MH*, what is the
Ka of the acid?
Ka of formic acid is 1.8·10⁻⁴ M.
Briefing :Chemical dissociation of formic acid in the water:
HCOOH(aq) ⇄ HCOO⁻(aq) + H⁺(aq).
K = [HCOO⁻] · [H⁺] / [HCOOH].
equilibrium concentration of [HCOOH] = 0.2 M,
equilibrium concentration of [H⁺] = 0.0.6 M,
equilibrium concentration of [HCOO⁻] = 0.006 M
K = (0.006 M)² / 0.2 M.
K = 0.00018 M.
K = 1.8·10⁻⁴ M.
What happens in a dissociation reaction?When one molecule splits into two smaller ones, a dissociation reaction takes place, which results in a loss of energy. Decomposition reactions, which are also known as dissociation reactions, are those in which a large molecule is broken down into smaller products.
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If the average speed of a water molecule at 25°c is 640 m/s, what is the average speed at 100°c?.
The average speed of water molecules at 100°C will be 715 m/s.
The average speed of a molecule is given by the following equation
Average speed = √8RT/πM
Here T is the temperature
R is the universal gas constant
M is the molar mass of the molecule
From the above equation, we can see that the average speed of a water molecule is directly proportional to the root of the temperature.
Hence, the average speed v₁ at 25 °C is ∝ √298 ......(i)
And average speed v₂ at 100 °C is ∝ √373..........(ii)
Dividing equations (i) and (ii)
v₁/v₂ = √298/√373
640/v₂ = √298/373
v₂ = 640× √373/298
v₂ = 715 m/s
Hence, The average speed of water molecules at 100°C will be 715 m/s.
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how do you think car pooling help reduce air pollution
Answer:
Carpooling with just one other person means that there is one fewer vehicle on the roads. That vehicle won't be emitting greenhouse gases during that commute.
Explanation:
1. When you add hot water to cold water, the cold water warms up because of
a. insulation
b. convection
c. radiation
d. solar energy
Answer: Convection
Explanation: When you add hot water to a cold water, the cold water warms up because of convection. Convection refers to the invasion of warmer or hotter water to the cold water. The process relates to the situation where the cooler water sinks and the warmer water rises.
Answer:
b. convection
Explanation:
A niche is_____________?
Answer:
The term niche, when used in the science of ecological biology, is used to define an organism's role in an ecosystem. Not only does its niche include the environment that a given organism lives in, but it also includes the organism's "job" in that environment.
Answer:
a niche is an area within an ecosystem in which a particular group of organisms live in.