A nugget of gold is placed in a graduated cylinder that contains 80 mL of water. The water level rises to 225 mL after the nugget is added to the cylinder. What is the volume of the gold nugget?

Weak acids;

\(CH_{3} COOH\\HF\\H_{2} CO_{3}\)

Weak base;

\((CH_{3}) _{3} N\\NH_{3}\)

Strong acid;

\(HCl\\HNO_{3}\)

Strong base;

LiOH

\(Ba(OH)_{2}\)

Other;

NaCl

We know that a weak acid is an acid that does not dissociate completely in solution. On the other wand, a weak base is a base that does not dissociate completely in solution.

A strong acid is the kind of acid that would be completely dissociated when we dissolve it in aqueous solution while a strong base is a base that would dissociate completely if we dissolve it in solution.

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Answer:

460 g

Explanation:

We have been asked to determine the mass of 10 mol CH2O2.

We know that 1 mol CH2O2 = 46g.

Thus to find 10 mol CH2O2 we cross multiply as shown below;

mass = (10 mol x 46 g)/(1 mol)

= 460 g of CH2O2

Therefore the mass of 10 mol CH2O2 is 460 g

It would be the first one. I'm sorry if I'm wrong. I used to be awesome at this kind of stuff.

Answer:

Explanation:

Fourth option

ʕ◉ᴥ◉ʔ Gimme crown please

The enzymes, that break down the insects are most likely what kind of biological catalyst.

Biological catalysts are called enzymes. There is, for instance, an enzyme in our saliva which converts starch to a simple sugar, which is used by the cell to produce energy, and another enzyme which degrades the excess lactic acid produced when we overexert ourselves. Enzymes are proteins that catalyze a chemical reaction in our body. They function as a catalyst that speeds up the reaction by lowering the activation energy.

The enzyme accelerates a chemical reaction without changing its equilibrium, so it is called as a biocatalyst.

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During the 1920s, installment buying, income inequality, and stock market speculation contributed to the economic weaknesses that helped bring about the Great Depression.

The use of installment buying allowed consumers to purchase goods on credit, which led to an increase in consumer spending but also led to high levels of personal debt. Income inequality was also a major issue during this time, with a small percentage of the population holding the majority of the wealth. Stock market speculation led to a boom in the stock market, but many investors were buying stocks on margin, which led to a stock market crash in 1929. These factors, along with other economic and political factors, contributed to the Great Depression, which lasted throughout the 1930s.

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Each reaction's Lewis acid and Lewis base are as follows:

AlCl3 is the Lewis acid in the reaction, whereas Cl- is the Lewis base. F- is the Lewis base and BF3 is the Lewis acid in the reaction Cl- + AlCl3 --> AlCl4- BF3 + F- --> BF4-

The Lewis base in this reaction is NH3, and the Lewis acid is H+. NH3 + H+ --> NH4+

Explanation: A Lewis acid acts as an electron pair acceptor in a Lewis acid-base reaction, whereas a Lewis base acts as an electron pair donor. In the initial reaction, Cl- provides AlCl3 with a pair of electrons, which AlCl3 accepts to produce AlCl4-. As a result, AlCl3 is the Lewis acid and Cl- is the Lewis base. In the subsequent response, F- provides two pairs. BF3 takes the electrons and transforms them into BF4-. Hence, the Lewis bases are F- and BF3, respectively. In the third reaction, H+ absorbs a pair of electrons from NH3 and forms NH4+ as a result. As a result, the Lewis bases are NH3 and H+.

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Answer:

National Pride Projects are a set of infrastructure projects by the government of Nepal based on the proposal by the National Planning Commission.

Glycerol is a polyol and can form hydrogen bonds with itself, resulting in a higher surface tension compared to phosphatidic acid.

The surface tension is not set in stone by the intermolecular forces between the molecules of the liquid.

Phosphatidic acid is a phospholipid and doesn't have the capacity to frame hydrogen bonds with itself, bringing about lower surface tension.

The nature and strength of intermolecular forces, temperature, and concentration levels can all influence the surface tension of a substance

Factors like sub-atomic design, intermolecular communications, and temperature can all affect the surface tension of a substance, making it trying to foresee which substance would display a more prominent surface tension without exploratory information.

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When you have taken too much of a chemical for an experiment, you should carefully pour the extra back in its original container.

Select the option c: Carefully pour the extra back in its original container.

It is very important to measure the chemicals accurately and precisely as overdosing can lead to serious consequences. But, if by mistake you have taken too much of a chemical for an experiment, you should carefully pour the extra back in its original container because it helps you to avoid waste and keep the chemicals from getting contaminated. The leftover chemical can be used later in other experiments. So, option c is the correct answer.

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Answer:

21st century

Explanation:

Explanation:

To calculate the molarity of a solution, we need to know the number of moles of solute (in this case, KCl) and the volume of the solution in liters.

First, we need to calculate the number of moles of KCl. We can do this by using the formula: moles of KCl = (mass of KCl in grams) / (molar mass of KCl in grams/mole)

The molar mass of KCl is 74.5513 g/mol, so we can use this to calculate the number of moles of KCl in the solution:

moles of KCl = (0.93 g) / (74.5513 g/mol) = 0.01239 moles

Next, we can use this number of moles to calculate the molarity of the solution. Molarity is defined as moles of solute per liter of solution, so we can use the following formula to calculate the molarity of the solution:

molarity of solution = (moles of KCl) / (volume of solution in liters)

In this case, the volume of the solution is 0.75 L, so we can substitute these values into the formula:

molarity of solution = (0.01239 moles) / (0.75 L) = 0.0165 moles/L or approximately 0.0165 M

The electron arrangements in a given group of elements are related because they have the same number of electrons in their outermost energy level, also known as the valence electrons. This is known as the group number or the number of valence electrons.

This relationship is manifested in the properties of the elements in the given group because elements with the same number of valence electrons tend to have similar chemical behavior and properties.

elements, also known as alkali metals, have one valence electron. This makes them highly reactive and they easily lose that one electron to form a +1 ion. They are soft, shiny, and have low melting and boiling points. elements, also known as halogens, have seven valence electrons. They are highly reactive and tend to gain one electron to achieve a stable electron configuration.

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Answer: the answer is B: Minerals dissolve and crystallize! :D

Explanation: hope this helps!

Answer:

40.79

Explanation:

an ounce is equal to approximately 28.3 grams.

if you have 4 ounces then it would be equal to about 113.4 grams. then you would divide that by 2.78 which will equal about 40.8

A chocolate bar weighs 4.00 ounces. The number of calories in the chocolate bar is 40.79.

Calories are the unit of measurement of the quantity of food that is taken by a person. There are definite calories given for male and female that is taken to be healthy.

Mass is the quantity of matter of a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.

Here, the mass of the chocolate is given 4.00 ounces.

The calories of the chocolate are 2.78 calories per gram. The calories of th3 chocolate are to be calculated.

An ounce is equal to approximately 28.3 grams.

So, if 4 ounces will be equal to 113.4 grams

then, 113.4 /  2.78 = 40.79

Thus, the calories in the chocolate bar are 40.79.

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Among the given options, the gas with the highest rate of effusion is NO2 (option D).

The rate of effusion is determined by Graham's law of effusion, which states that the rate of effusion of a gas is inversely proportional to the square root of its molar mass. Therefore, the gas with the lowest molar mass will have the highest rate of effusion.

Let's compare the molar masses of the gases provided. N2O has a molar mass of 44 g/mol, N2O4 has a molar mass of 92 g/mol, NO3 has a molar mass of 62 g/mol, and NO2 has a molar mass of 46 g/mol.

Among these options, NO2 has the lowest molar mass, which means it will have the highest rate of effusion according to Graham's law. The other gases, N2O, N2O4, and NO3, have higher molar masses, and therefore, their rates of effusion will be slower compared to NO2.

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(B) 2-methylbut-2-ene. 2-methylbut-2-ene, can be polymerized to form longer chain polymers through addition reactions with other alkene molecules.

2-Methylbut-2-ene is an alkene hydrocarbon molecule with the chemical formula C5H10. It comprises a carbon skeleton with five carbon atoms and 10 hydrogen atoms. The molecule contains a double bond between the second and third carbon atoms and a methyl group (-CH3) attached to the second carbon atom.

Polymerization is the process of forming long chains of repeating units, called polymers, from smaller molecules, known as monomers. The process involves the covalent bonding of monomers through addition reactions.

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Cohesion in water refers to the attractive forces between water molecules. This is due to the presence of hydrogen bonds between the molecules, which are formed by the partial positive charge on the hydrogen atoms of one molecule and the partial negative charge on the oxygen atoms of another molecule.

Cohesion is important in water because it allows for the surface tension of water, which is the resistance of the surface of a liquid to breaking when a force is applied to it. This is why water droplets form spheres and why insects can walk on water.

Cohesion also contributes to the high heat of vaporization of water.

This is the amount of energy required to turn liquid water into water vapor. Because of the strong hydrogen bonds between water molecules, a lot of energy is required to break them and turn water into a gas, which is why it takes a lot of energy to boil water.

This property of water also contributes to the moderation of temperatures on earth, as it takes a lot of energy to turn liquid water into water vapor, and this process cools the surface of the earth.

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I am using EE representing * 10 ^. There should be that button at your scientific calculator.

1 mol = 6.02EE23 [means 6.02 * 10^23)

Ca = 40.078 grams

F = 18.998 grams

CaF2 = 78.074 grams

2.82EE22 CaF2 particles * (1 mol CaF2 / 6.02EE23 CaF2 particles) * ( 78.074g CaF2 / 1 mol CaF2)

= (2.82EE22 CaF2 particles * 1 mol CaF2 * 78.074g CaF2) / (6.02EE23 CaF2 particles * 1 mol CaF2)

= (2.82EE22 * 78.074g CaF2) / (6.02EE23)

= approx 3.66g CaF2 (Sig figs! I hate them!)

Oxygen (O) has a higher first ionization energy than Nitrogen (N).

The first ionization energy is the energy required to remove one electron from an atom in its neutral state. The reason for Oxygen having a higher first ionization energy is that it has one more proton in its nucleus than Nitrogen. This means that the electrons in its outer shell are held more tightly due to the stronger electrostatic attraction between the positively charged nucleus and the negatively charged electrons.

Nitrogen has the electronic configuration of 1s² 2s² 2p³, which means that it has five electrons in its outermost shell. The first ionization energy of nitrogen is 1402.3 kJ/mol. On the other hand, Oxygen has the electronic configuration of 1s² 2s² 2p⁴, which means it has six electrons in its outermost shell. The extra electron in the outer shell of oxygen increases the electrostatic attraction between the positively charged nucleus and negatively charged electrons, making it more difficult to remove an electron from the atom. The first ionization energy of oxygen is 1313.9 kJ/mol, which is higher than that of nitrogen.

Therefore, Oxygen has a higher first ionization energy than Nitrogen due to its greater nuclear charge, resulting in stronger electrostatic attraction between its nucleus and outer electrons.

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In 0.75 moles of caffeine, there are a total of 6 carbon atoms, 7.5 hydrogen atoms, 3 nitrogen atoms, and 1.5 oxygen atoms.

To determine the total number of atoms in 0.75 moles of caffeine, we need to consider the molecular formula of caffeine, which is C8H10N4O2. The molecular formula provides the ratios of each element present in the compound. By multiplying the number of atoms in each element by the corresponding coefficient in the molecular formula, we can calculate the total number of atoms. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms in each molecule of caffeine. Multiplying these values by 0.75 moles will give us the total number of atoms in 0.75 moles of caffeine.

The molecular formula of caffeine, C8H10N4O2, provides the number of atoms for each element present in one molecule of caffeine. In this case, there are 8 carbon (C) atoms, 10 hydrogen (H) atoms, 4 nitrogen (N) atoms, and 2 oxygen (O) atoms.

To calculate the total number of atoms in 0.75 moles of caffeine, we need to multiply the number of atoms for each element by the coefficient in the molecular formula, and then multiply that by the number of moles (0.75 moles).

For carbon (C): 8 atoms x 0.75 moles = 6 atoms (since there are 8 carbon atoms in one molecule of caffeine).

For hydrogen (H): 10 atoms x 0.75 moles = 7.5 atoms (since there are 10 hydrogen atoms in one molecule of caffeine).

For nitrogen (N): 4 atoms x 0.75 moles = 3 atoms (since there are 4 nitrogen atoms in one molecule of caffeine).

For oxygen (O): 2 atoms x 0.75 moles = 1.5 atoms (since there are 2 oxygen atoms in one molecule of caffeine).

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Answer:

true is the answer of first

Answer:no idea

Explanation:

I js needed points

Platinum has a face-centered cubic crystal structure and a density of 21.5 g/cm^3. The radius of the platinum atom is 139pm.

The radius of the platinum atom can be found by the relation of density and radius of atom.

Platinum has a face-centered cubic (fcc) crystal structure which means that 4 atoms are present in each structure.

Hence no. of atoms, Z=4

The radius of atom can be found out by substitution in the below formula:

Relation of density and radius of atom:

Density, d = Z × M / Nₐ × a³    

∴ where, Z is the no. of atoms = 4                

M is the Molecular mass of platinum = 195 g/mol    

 N is the Avogadro's number = 6 × 10²³ / mol                

 a is the radius of the atom = ?                

d is the density = 21.5 g/cm³

⇒ a³ = Z × M / Nₐ × d

⇒ a³ = 4 × 195 / 6 × 10²³ ×  21.5

⇒ a = 139 × 10⁻¹²m

a = 139pm

Hence, the radius of the platinum atom is 139pm.

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The answer is 139pm

The relationship between density and radius of an atom may be used to calculate the radius of a platinum atom.

Platinum has a face-centred cubic (fcc) crystal structure, which implies that each structure has four atoms.

As a result, the number of atoms is Z=4.

Substitution in the following formula yields the radius of an atom:

Atomic density and radius relationship:

Density,\($d=Z \times M / N_{a} \times a^{3}$\)

\($\therefore$\) where, Z is the no. of atoms =4

\($\mathrm{M}$\) is the Molecular mass of platinum \($=195 \mathrm{~g} / \mathrm{mol}$\)

\($\mathrm{N}$\)is the Avogadro's number \($=6 \times 10^{23} / \mathrm{mol}$\)

a is the radius of the atom = ?

\($\mathrm{d}$\) is the density \($=21.5 \mathrm{~g} / \mathrm{cm}^{3}$\)

\($$\begin{aligned}&\Rightarrow a^{3}=Z \times M / N_{a} \times d \\&\Rightarrow a^{3}=4 \times 195 / 6 \times 10^{23} \times 21.5 \\&\Rightarrow a=139 \times 10^{-12} m \\&a=139 p m\end{aligned}$$\)

What is platinum atom?

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Answer:

A because density DOES have a unit

Explanation:

Answer:

The ice platfor is slowly decrecing from 3.5 km to 2.2km over the  span of 60 years.

Explanation:

The molar mass of a substance is the mass of one mole of that substance, and it is usually measured in units of grams per mole (g/mol). In the case of helium gas (He2), the molar mass is calculated by adding up the masses of two atoms of helium.

Helium is a chemical element with the atomic number 2 and the symbol He. Its atomic weight is 4.003, which means that one atom of helium has a mass of 4.003 grams. To find the molar mass of helium gas, we need to multiply the atomic weight of helium by Avogadro's number, which is 6.022 x 10^23 atoms per mole.

Therefore, the molar mass of helium gas (He2) is:

(2 x 4.003 g/mol) = 8.006 g/mol

It is important to note that, helium is a diatomic molecule, meaning it exist in pairs (He2) and it is a gas at room temperature and standard pressure, so the molar mass of helium gas is 8.006 g/mol.

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Answer:

only the atoms present in the reactants can end up in the products.

Explanation: