Two objects are described below.

Thing 1: It has a volume.
Thing 2: It is made up of particles too small to see.

Which statement is true?

The first object is non-matter, and the second object is matter.
The first object is matter, and the second object is non-matter.
Both objects are matter.
Both objects are non-matter.

Answer: are you in times4learning?

Explanation:

Answer:

6.79 atm

Explanation:

Applying Dalton's law of partial pressure:

\(P_{total} = P_{helium} + P_{oxygen}\), where \(P_{total}\) = total partial pressure of all the component gases in the mixture, \(P_{helium}\) = partial pressure of helium gas, and \(P_{oxygen}\) = partial pressure of oxygen gas.

From the illustration, \(P_{total}\) = 7.00 atm and \(P_{oxygen}\) = 0.21 atm. Hence, the partial pressure due to helium is calculated such that:

\(P_{helium}\) = \(P_{total} - P_{oxygen}\)

           = 7.00 - 0.21

              = 6.79 atm

Therefore, the partial pressure due to helium in order to maintain the pressure due to oxygen at 0.21 atm would be 6.79 atm.

Answer:

Explanation:

mg +2hcl=mgcl2 +h2

mhcl=10.95g

nhcl==0.3

nmg=1/2nhcl=0.15

mMg=3.6g

m mgcl2=14.25

Answer:

Three half-lives

Explanation:

12.5% is one-eighth. One eighth is the cube of one half, so it would take three half-lives to reduce a reactant's concentration to 12.5%

Three half-lives are required for the concentration of reactant to decrease to 12. 5% of its original value.

Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.

In the given example 12.5 % is 1/8  and three times 1/2 that is 1/2×1/2×1/2=1/8 , hence  three half lives are  required for the concentration of reactant to decrease to 12. 5% of its original value.

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Answer:

hope u umderstood ! if explanation needed then conta t

Nitrogen and hydrogen react to form ammonia and is a combination reaction. The grams of hydrogen used in the reaction with nitrogen to form ammonia is 2.0 grams.

Mass is the weight or the product of the volume and density of the substance. It can be calculated as, \(\rm volume \times density.\)

Given,

Mass of nitrogen = 10.0 grams

Mass of ammonia = 12.0 grams

Mass of hydrogen = x gram

Solving for x:

\(\begin{aligned}\rm 10 + x &= 12\\\\\rm x &= 12.0 - 10.0\\\\&= 2.0 \;\rm grams\end{aligned}\)

Therefore, 2.0 grams of hydrogen is required to react with 10.0 grams of nitrogen to produce 12.0 grams of ammonia.

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A transformation where there is a rearrangement of atoms: Chemical transformation. In a chemical transformation, the atoms rearrange to form new chemical substances with different properties.

These reactions are not easily reversible: Chemical transformation. Chemical reactions often involve the formation of new chemical bonds and the breaking of existing bonds, making them generally irreversible under normal conditions.

Transformations that are easily reversible: Physical transformation. Physical transformations involve changes in physical properties such as state, size, shape, or phase of a substance. These changes can typically be reversed without forming new substances.

CO2 (s) → CO2 (g) ...is an example of a physical transformation. This transformation involves a change in the physical state of carbon dioxide from a solid to a gas without any alteration in its chemical composition.

CH4 + 2 O2 → CO2 + 2 H2O ...is an example of a chemical transformation. This is a combustion reaction where methane (CH4) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The chemical composition of the substances changes, forming new molecules.

A transformation in which you only increase or decrease the amount of attraction between particles, but the substance retains its identity: Physical transformation. This refers to changes in physical properties such as melting, boiling, or dissolving, where the substance itself remains unchanged, and only the intermolecular forces are affected.

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Answer:

Check explanation for answer

Explanation:

Let's analyze each reaction per separate and explain the reason of the type of reaction:

a) CH₃CH₂CH₃ + 5O₂ -------> 3CO₂ + 4H₂O

Type of reaction: Combustion

In this case, the combustion is a reaction where a compound reacts with a molecule of oxygen to produce, in almost every case, CO₂ and H₂O. Therefore, this reaction can only be a combustion. It cannot be combination because combination requires two compounds to be combined and formed, in most of the cases, one product. In this case we have two. It can be similar to a double displacement but not combination.

b) KOH + HClO₄ --------> KClO₄ + H₂O

Type of reaction: Acid base reaction, double displacement.

This is clearly an acid base reaction cause we have an acid (HClO₄) reacting with a base (KOH) to produce a salt and water. It's also a double displacement reaction, because as you can see, the atom of Potassium (K) is displacing the H, and the H displaces the K simultaneously, and form two new products.

c) CH₃CH₂OH + 3O₂ -------> 2CO₂ + 3H₂O

Type of reaction: Combustion

The reason, the same for case a).

d) CuSO₄ + ZnCrO₄ ---------> CuCrO₄ + ZnSO₄

Type of reaction: Double displacement and precipitation

In this case, it's pretty similar to case b), The Cu replaces the Zn in the CrO₄, while the Zn replaces the Cu with the SO₄. But it's also a precipitation because the CuCrO₄ that was formed is in solid state, and if the reactants were in aqueous state and a solid was formed, this means that this solid is precipitating from the reaction. Therefore, it's a precipitation reaction too.

Hope this helps

Answer:

Oh hey sorry, they deleted my account again..

Explanation:

By eating half cooked meat

Answer:  E

Explanation: The ball is yellow so it can easily represent the sun

Answer:

it will be none of the above because sitting doesn't cause depression, it's the environment around that person. the body language, the way they talk... Etc.

The carbon dioxide produced during the breakdown of pyruvic acid is a byproduct of decarboxylation and the Krebs cycle. This CO2 is expelled from the cell as waste, while the remaining compounds continue through the process of cellular respiration to generate ATP, which provides energy for the cell.

The carbon dioxide produced during the breakdown of pyruvic acid plays a crucial role in the process of cellular respiration. Pyruvic acid, a three-carbon compound, is generated through glycolysis, the first stage of cellular respiration that occurs in the cytoplasm.

When pyruvic acid enters the mitochondria, it undergoes a process called decarboxylation, facilitated by the pyruvate dehydrogenase complex. During decarboxylation, one carbon atom is removed from the pyruvic acid molecule, forming carbon dioxide as a byproduct. This CO2 is subsequently released from the cell as waste.

Simultaneously, the remaining two-carbon molecule, called acetyl CoA, combines with oxaloacetate in the Krebs cycle (also known as the citric acid cycle or TCA cycle). Throughout the Krebs cycle, the carbon molecules undergo a series of reactions, which ultimately lead to the formation of additional CO2 molecules. These CO2 molecules are also released as waste products.

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1) The reaction is exothermic and heat is a product

2) The color would turn to pink.

Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.

If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.

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The concentration of AB at 21 s is 0.526 M.

The data below show the concentration of AB versus time for the following reaction:

AB(g)→A(g)+B(g)Time (s)  [AB] (M)0  0.95050  0.459100  0.302150  0.225200  0.180250  0.149300  0.128350  0.112400  0.0994450  0.0894500  0.0812

Determine the value of the rate constant:

The reaction is a first-order reaction. The concentration of AB changes as follows:

[AB]t = [AB]0e^-ktln

([AB]t/[AB]0) = -ktln

(0.459/0.950) = -k(

0.693)k = 1.88 × 10^-3 s^-1

The rate constant value is 1.88 × 10^-3 s^-1.

Predict the concentration of AB at 21 s.

The formula for a first-order reaction is given by ln

([A]t/[A]0) = -ktln([AB]t

[AB]0) = -kt[AB]t = [AB]0 e^-kt

[AB]t = (0.950) e^-(1.88 × 10^-3)(21)[AB]t = 0.526 M.

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The type of decay that Am-241 undergoes to become Np-237 is alpha decay. The correct option is a.

Alpha decay is a type of decay or transformation in which a nucleus emits an alpha particle and change into different atomic nuclei. The atomic number reduces by 2 and the mass is reduced by 4.

Am-241 is an isotope of the chemical element americium. It is a radioactive element and its radioactive decay period is 432.2 years. It is used in the testing of machinery.

When the nucleus of Am changes or emits a radioactive particle. It converts into Np-237. The process is called alpha decay. The atomic mass is reduced by four, and the 241 converts into 237, which become neptunium.

Thus, the correct option is a. Alpha decay.

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Answer:

I don't have how to do that in numerical figures

The amount of iron, in grams, that is needed to completely react with 878.0 g of  \(Cl_2\) would be 460.392 grams

Iron (III) chloride is produced by reacting iron with chlorine as follows:

\(Fe + Cl_2 --- > FeCl_3\)

The balanced equation of the reaction goes thus:

\(2Fe + 3Cl_2 --- > 2FeCl_3\)

The mole ratio of iron to chlorine is 2:3.

Recall that: mole = mass/molar mass

Molar mass of \(Cl_2\) = 35.5 x 2

                             = 71 g/mol

Mole of 878.0 g  \(Cl_2\) = 878/71

                                 = 12.3662 moles

From the mole ratio, the equivalent mole of Fe from 12.3662 moles  \(Cl_2\) will be:

 12.3662 x 2/3 = 8.2441 moles

Mass of 8.2441 mole Fe = mole x molar mass

Molar mass of Fe = 55.845 g/mol

Mass of 8.2441 moles Fe = 8.2441 x 55.845

                                         = 460.392 grams

The numbers in the final multiplication operation have 5 significant figures each. Thus, the significant figure of the final answer will also be 5.

in other words, the amount of iron needed to completely react with 878.0 g of  \(Cl_2\) is 460.392 grams.

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Using the calculated molarity of the unknown acid, you can use the Rice table to determine the initial pH of the solution.


The rice table is a tool that is used to determine the unknown variables when calculating equilibrium concentrations. When titrating an unknown acid, the molarity of the solution is determined by using stoichiometric ratios. Once the molarity of the unknown acid is known, the Rice table can be used to determine the initial pH of the solution.

This is achieved by setting up a table that shows the initial concentration of each species, the change in concentration, and the equilibrium concentration. By using the equilibrium concentrations, it is possible to determine the equilibrium constant and calculate the pH of the solution.

In conclusion, if the initial pH determined using the Rice table matches the actual pH of the titration curve, it confirms that the calculation of the molarity was correct. If the pH values do not match, it is an indication of an error in the calculations, and a recalculation is necessary.

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When an electron absorbs energy, it moves from a lower energy state to a higher energy state and emits energy while coming down to the ground state in form of different lights at different energy levels. So, when it is at the excited state initially and moves to lower-excited states it emits light of different frequencies at different energy levels this is known as the emission spectrum.

When an electron absorbs energy, it moves from a lower energy state to a higher energy state and emits energy while coming down to the ground state in form of different lights at different energy levels. So, when it is at the excited state initially and moves to lower-excited states it emits light of different frequencies at different energy levels this is known as the emission spectrum.

Emission spectra: Electrons release energy in the form of light while coming down the ground state in the form of different spectra of light. While at the excited state electron remains at the higher energy level and always has more energy when compared to the ground level whereas in the ground state electron remains at the lowest energy state.

These spectra help in various things like they help in figuring out the kind of elements the substance is made of as every element radiated a different amount of energy.

This is the relation between the emission spectra and the ground and excited state of an electron.

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A buffer is made from an acid - base conjugate pair as shown by option A

Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.

This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.

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Explanation:

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Answer:

Explanation:

if an object is heavy,the acceleration decreases because the acceleration produced on a body is inversely proportional to its mass.

Answer:

A metallic bond is a force of attraction between charged metal ions and the electrons that are in the delocalized bond, which covers the assembly of ions. A covalent bond is the force of attraction between the nuclei of atoms, and the electrons shared between them.

Explanation:

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond can be generated by electrostatic attraction between charged ions (for example, ionic bonds) or by electron sharing (for example, covalent bonds).

I hope this helps you :)

Answer: 5 ml

Explanation:

15 Ml minus the 10 the water takes up = volume of the rock

Answer: The alkyne

Explanation:

Answer:

the alkyne

Explanation:

Hope it helps u

FOLLOW MY ACCOUNT PLS PLS

Answer:

12.0778

Explanation:

Answer:

the answers is 1.204×10/23

Explanation:

idek

According to Avogadro's number, there are 1.204 × 10²³ atoms in 39.39 g of gold.

To determine the number of atoms in 39.39 g of gold, we need to use the Avogadro's number, which is equal to 6.022 × 10²³ atoms/mol.

First,  need to convert the given mass from grams to moles by dividing it by the molar mass of gold, which is 196.967 g/mol.

\(\dfrac{39.39}{196.96}\\=0.19999\) moles

Now, we can use Avogadro's number to find the number of atoms:

\(0.19999\times6.023\tims10^2^3\\=1.204\times10^2^3\)

Therefore, the prospector has 1.204 × 10²³ atoms of gold.

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The term "catalyst" best describes the role of platinum in the system.

Let us explore the role that platinum plays as a catalyst. Catalysts are defined as substances that speed up the rate of chemical reactions without changing their own mass or chemical properties in the process.

The amount of energy required to activate a process is reduced when catalysts are added. It is stated in the question that if the system incorporates platinum, then the amount of energy that is required is going to be lower. Therefore, platinum is functioning as a catalyst in this situation because it is lowering the required activation energy of the reaction.

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If the student was synthesizing aspirin in the lab and she calculated the mass of aspirin that should form as 11.74 g and when she weighed her aspirin product on the balance which was 2.63 g. The percent yield can be 22.4 %.

The amount of a product received from a reaction is indicated by the percent yield.

The theoretical yield is given, which is 11.74 g and the actual yield is given which is 2.63 g.

Now, we use the formula of the percentage (%) yield,

percentage (%) yield = \((\frac{ Actual yield }{ Theoretical yield } )\) × 100  

% yield = \((\frac{2.63}{11.74})\) × 100

% yield = 22.4 %

So, the percentage (%) yield is 22.4 %.

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