Which of the following are true about an atom? Choose all that apply.

Answer:

its A

Explanation:

The molarity of NaOH solution that required 20.15mL is 0.0004032M.

Molarity is the concentration of a substance in solution, expressed as the number moles of solute per litre of solution.

Molarity of a solution can be calculated by dividing the number of moles in the solution by the volume as follows:

Molarity = no of moles ÷ volume

According to this question, 0.325g of KHP required 20.15ml of NaOH for neutralization. The number of moles in this mass can be calculated as follows:

no of moles = 0.325g ÷ 40g/mol

no of moles = 0.008125mol

Molarity = 0.008125mol ÷ 20.15mL

Molarity = 0.0004032M

Therefore, 0.0004032M is the molarity of the solution.

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Answer:

2CH3OH + 3O2 --> 2CO2 + 4H2O

This is called Combustion of Methanol

Explanation:

Count the numbers of atoms on each sides and try to get the same amount of quantity on each sides, so you'll eventually get "balanced".

or

Watch this video: "How to Balance CH3OH + O2 = CO2+ H2O (Combustion of Methanol)"

Good luck with future work! Keep studying chemistry!

- D

Answer: B.) -12.4

Explanation: This is because the sign of heat transfer is determined by the system's perspective. In this case, the system is releasing heat to the surroundings, which means that heat is flowing out of the system, making the heat transfer negative. The magnitude of the heat transfer is 12.4 J.

Answer:

the abundance of non-native plants. this MAY be right.

Explanation:

i thought it would be an increase in pollution.

Answer:

The breaks follows the crystal structure

Explanation:

In crystalline solids, the atoms, ions or molecules are arranged in an ordered and symmetrical pattern that is repeated over the entire crystal. … This means that a crystalline solid will have a distinct melting point, because applying heat will break all the bonds at the same time

According to the forces of attraction, the break  follows the crystal structure characterizes a crystalline solid when it breaks.

Forces of attraction  is a force by which atoms in a molecule  combine. it is basically an attractive force in nature.  It can act between an ion  and an atom as well.It varies for different  states  of matter that is solids, liquids and gases.

The forces of attraction are maximum in solids as  the molecules present in solid are tightly held while it is minimum in gases  as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.

The physical properties such as melting point, boiling point, density  are all dependent on forces of attraction which exists in the substances.

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Answer:14=D

15=B

16=D

17=C

18=A

19=D

Explanation: I did this and got a 100% °³°

Answer:

he is ok

Explanation:

Answer: Yes but I also love louis and the Larry Stylinson ship theyre so cute!

Explanation:

0>0

Answer:

Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.

Answer:

If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.

The pH at the equivalence point in the titration of 50.0 ml of 0.300 M CH₃COOH with 0.3 M NaOH is 8.61.

At the equivalence point in the titration of CH₃COOH with NaOH, the pH is determined by the hydrolysis of the salt formed, which is CH3COO⁻ and Na+.

The equation for the hydrolysis reaction is:

CH3COO⁻ + H2O ⇌ CH3COOH + OH⁻
We can use the Ka value for CH₃COOH to find the Kb value for CH3COO⁻ using the equation:

Kw = Ka x Kb

Where Kw is the ion product constant for water (1.0 x 10⁻¹⁴).
Kb = Kw/Ka

= (1.0 x 10⁻¹⁴)/(1.8 x 10⁻⁵)

= 5.56 x 10⁻¹⁰
Now we can use the Kb value to find the concentration of OH⁻ at the equivalence point using the equation:

Kb = ([OH⁻][CH3COOH])/[CH3COO⁻].

Since the concentrations of CH3COOH and CH3COO⁻ are equal at the equivalence point, we can simplify the equation to Kb = ([OH⁻]²)/[CH₃COO⁻].
Hence,
[OH-] = \(\sqrt{Kb(CH3COO-)}\)

=\(\sqrt{5.56(10^{-10})(0.3) }\)

= 4.06 x 10⁻⁶ M
Use the concentration of OH⁻ to find the pH at the equivalence point using the equation pOH = -log[OH-] and the relationship pH + pOH = 14.
pOH = -log(4.06 x 10⁻⁶)

= 5.39
pH = 14 - 5.39

= 8.61
Therefore, the pH at the equivalence point in the titration of 50.0 ml of 0.300 M CH3COOH with 0.3 M NaOH is 8.61.

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The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

CH4 (g) and O2 (g) are both in the gaseous state, while CO2 (g) and H2O (g) are also in the gaseous state.

In the above reaction, the reactants are in the gaseous state, and the products formed are also in the gaseous state.

Every compound in a chemical reaction can be in any state of matter like solid, liquid, or gas. In the reaction of methane and oxygen, the initial state of the reactants is in the gaseous form. The chemical reaction of methane and oxygen is given by the equation CH4 (g) + 2 O2 (g) -> CO2 (g) + 2 H2O (g).Here, methane and oxygen are the reactants, and carbon dioxide and water are the products. Methane (CH4) and oxygen (O2) react together in the presence of a spark or heat to produce carbon dioxide (CO2) and water (H2O).In the reaction, the methane gas combines with oxygen gas, which causes the release of heat energy and forms carbon dioxide gas and water vapor. Methane gas is a colorless and odorless gas that burns cleanly and is one of the primary components of natural gas.

The oxygen gas required for the reaction is available in the atmosphere. Carbon dioxide is a colorless gas with a faint odor and taste and is a significant component of the Earth's atmosphere. Water is a colorless, odorless, and tasteless liquid that is essential to life.The state of matter of every compound in a chemical reaction can change depending on the conditions in which the reaction occurs. For instance, a substance that is in the solid state at a lower temperature may melt into a liquid or boil into a gas at a higher temperature. Similarly, a liquid may freeze into a solid or vaporize into a gas under different conditions.

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The volume of the alcohol can be obtained as 79.9 mL.

We know that there are many different unit of concentration. The unit of concentration that we are going to focus on here is the volume per volume percent. This has to do with the volume of solute in a given volume of the solvent.

Thus we have;

Volume solution = 355 mL

Volume percent of the alcohol =  22.5%

Actual volume of the alcohol = x

We now have;

Volume percent = Volume of the alcohol (x)/volume of the solution * 100/1

22.5 = x/355 * 100/1

22.5 =  100x/355

x = 22.5 * 355/100

x = 79.9 mL

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Missing parts;

A mouthwash contains 22.5% (v/v) alcohol. If the bottle of mouthwash contains 355 mL, what is the volume, in milliliters, of alcohol

Answer:

salt increases the boiling temperature, but not by very much.

I hope this helps you and it is the right answer

Answer:

In cellular respiration, cells use oxygen to release energy stored in glucose.

If my answer helped, please mark me as the brainliest!!

Thank You!!

Answer:oxygen and sugars

Explanation:

The empirical formula of a compound gives the whole number ratio of atoms of various elements. The molecular formula of the compound is S₂O₈.

The molecular formula of a compound is defined as the formula which gives the actual number of atoms of various elements present in one molecule of the compound.

Here 33.38 % 'S' = 33.38 g

66.62 % 'O' = 66.62 g

Number of moles (n) = Given mass / Molar mass

'n' of 'S' = 33.38 / 32 = 1.04 moles

'n' of 'O' = 66.62 / 16 = 4.16 moles

The ratio of number of atoms of 'S' and 'O' = 1 : 4

So empirical formula is SO₄.

Since the molar mass = 192.14g

Molecular formula = (SO₄)ₙ

192.14 = n × (32 + 4 × 16)

n = 2

Thus the molecular formula is S₂O₈ .

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Answer:

the use of paleontology as a scientific tool

Explanation:

Answer: A forensic paleontologist is a scientist who uses their knowledge of fossils and ancient remains to help solve crimes and investigate mysteries. They apply principles from paleontology, the study of ancient life, to analyze evidence found at crime scenes or archaeological sites.

Answer:

\({ \boxed { \rm{ \: \: \: \: \: \: \: 1 \: mi \: \: \: \: \: \: \: \: }}} \\ { \boxed{ \rm{1 \times {10}^{11} \: nm }}} \\ { \boxed{ \rm{ \: \: \: \: \: \: \: \: \: \: 10 \: m \: \: \: \: }}} \\{ \boxed { \rm{ \: \: \: \: \: \: 50 \: in \: \: \: \: \: \: \: \: }}}\)

Explanation:

• For first length:

\({ \tt{ 1 \times {10}^{11} \: nm = (1 \times {10}^{11} ) \times {10}^{ - 9} \: m }} \\ \\ { \tt{ = 1 \times {10}^{(11 - 9)} \: m}} \\ \\ { \tt{ = 1 \times {10}^{2} = 100 \: m }}\)

• For second length is 10 m

• For third length

\({ \tt{1 \: mi = 1609 \: m}}\)

• For forth length;

\({ \tt{1 \: in = 0.0254 \: m}} \\ { \tt{50 \: in = (50 \times 0.0254)}} \\ = { \tt{1.27 \: m}}\)

Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer: 1395 grams of ice can be melted

Explanation:

To find the weight of ice that is melted by the heat liberated by condensing 180 g of superheated steam at 150°C, we need to use the following information:

The boiling point of water is 100°C

The heat of vaporization of water is 540 cal/g

The heat of fusion of ice is 80 cal/g

The specific heat of steam is 1.6 cal/g°C

First, we need to calculate the total heat energy released by the condensation of the steam. This can be found by using the heat of vaporization and the amount of steam being condensed:

180 g x 540 cal/g = 97200 cal

Next, we need to calculate the heat energy absorbed by the steam as it cools down from 150°C to 100°C. This can be found using the specific heat of steam and the change in temperature:

180 g x 1.6 cal/g°C x (100 - 150) = -14400 cal

Now, we can subtract the heat absorbed by the steam from the total heat released by the condensation to find the heat energy available to melt the ice:

97200 cal - (-14400 cal) = 111600 cal

Finally, we can divide this heat energy by the heat of fusion of ice to find the weight of ice that can be melted:

111600 cal / 80 cal/g = 1395 g

Therefore, 1395 grams of ice can be melted

1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Explanation:

n2 ×2b is the only solution

To recrystallize  If 1.5 grams of naphthalene, we need  2.35 L of water. When the solution cools to room temperature we could theoretically recover 606.6 mg of naphthalene.

Recrystallization occurs when we are able to dissolve a dissolve a substance in a hot solvent and then allow the solvent to cool to a much less temperature such the the solid begins to  reappear. The solvent must be chose in such a way that it is soluble at a higher temperature but less soluble at a lower temperature.

As we can see, the solubility of the naphthalene is shown in the image that has been attached to this answer. Recall that the solubility is the amount of substance that is dissolved at a given temperature.

We can see that the solubility of the naphthalene at the boiling point of water is 638.2 mg/L or 0.6382 g/L

The amount of water required is obtained from;

0.6382 g/L = 1.5 g/x

x = 1.5 g/ 0.6382 g/L

x = 2.35 L

The theoretical amount of naphthene that could be isolated is 638.2 mg - 31.6 mg = 606.6 mg

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This angle is greater than the right angle. The correct option is A.

The right angle is created when two straight lines cross at a 90° angle, or when they are perpendicular at the intersection. The symbol ∟ represents a right angle.

Look at this angle in the picture. This angle is greater than a right angle. The right angle is 90 degrees, and the angle is greater than the right angle. The angle can be 95 degrees.

Therefore, the correct option is A. greater than a right angle. A right angle looks like the corner of a square.

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The question is incomplete. Your most probably complete question is given below:

A. greater than a right angle

B equal to a right angle

C less than a right angle

Answer:

3.09 x 10²⁰ atoms

Explanation:

We want to find the number of atoms in 20.5mg of argon.

We can use dimensional analysis to do so.

See attached image for table.

Needed conversions:

Answer:

0.373 M

Explanation:

The balanced equation for the reaction is given below:

HC2H3O2 + NaOH —> NaC2H3O2 + H2O

From the balanced equation above, the following were obtained:

Mole ratio of the acid, HC2H3O2 (nA) = 1

Mole ratio of the base, NaOH (nB) = 1

Next, we shall write out the data obtained from the question. This include:

Volume of base, NaOH (Vb) = 32.17 mL

Molarity of base, NaOH (Mb) = 0.116 M

Volume of acid, HC2H3O2 (Va) = 10 mL

Molarity of acid, HC2H3O2 (Ma) =..?

The molarity of the acid solution can be obtained as follow:

MaVa/MbVb = nA/nB

Ma x 10 / 0.116 x 32.17 = 1

Cross multiply

Ma x 10 = 0.116 x 32.17

Divide both side by 10

Ma = (0.116 x 32.17) /10

Ma = 0.373 M

Therefore, the concentration of the acetic acid is 0.373 M.

The molecular mass of the gas, given that 2.63 g of the gas occupied 0.98 L at standard conditions of temperature and pressure is 60 g/mol

First, we shall obtain the mole of the gas. Details below:

PV = nRT

1 × 0.98 = n × 0.0821 × 273

0.98 = n × 22.4133

Divide both sides by 22.4133

n = 0.98 / 22.4133

n = 0.0437 mole

Finally, we shall obtain the molecular mass of the gas. This is shown below:

Molar mass = mass / mole

Molar mass of gas = 2.63 / 0.0437  

Molar mass of gas = 60 g/mol

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All the possible structural isomers for the molecular formula C₆H₁₂ are given here. All of them has the same number of carbon and hydrogen atoms but with different structures.

Isomers are compounds with the same chemical formula but different structures, spatial conformation, geometry, functional groups  etc. There are are different kinds of isomers.

Structural isomers are compounds with same formula but different structures. In the case alkanes, alkenes or alkynes, the position of the branches or groups attached can be of different but formula stay the the same.

Here, the compound with the formula, C₆H₁₂ have structures similar of alkenes and can have ring structures as shown in the image. The position of the double bond or the branches are different in each isomers.

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Answer:

Conduction

Explanation:

Answer:

Conduction is correct

Explanation: