Chemistry Middle School

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Answers

Answer 1
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Answer 2
The formula for calculating concentration is C = m/v where C means concentration , M means moles in the solution , this time it’s sodium hydroxide and V means volume.

Day 1)

Volume = 22.80
Mole = 39.997

Day 1 concentration = 39.997 / 22.80

Day 1 answer = 1.754

Day 2)

The mole does not change but the volume does and for day 2 it is 23.20

Day 2 concentration = 39.997 / 23.20

Day 2 answer = 1.724

Day 3)

Day 3 concentration = 39.997 / 23.90

Day 3 answer = 1.674

Day 4)

Day 4 concentration = 39.997 / 24.75

Day 4 answer = 1.616

Day 5)

Day 5 concentration = 39.997 / 25.1

Day 5 answer = 1.594

Related Questions

PLEASE HELP NEED IT NOW
what are the differences between a solute and a solution
help giving 50 pointss

Answers

A solute is the substance that is being dissolved in a solution. It is the component of the solution that is present in the smaller amount. For example, sugar is a solute when it is dissolved in water to make a sugar solution.

A solution, on the other hand, is a homogeneous mixture of two or more substances. It is made up of a solvent, which is the substance that dissolves the solute, and the solute itself. In the example of sugar in water, water is the solvent and sugar is the solute.

In summary, a solute is one of the components of a solution and a solution is a homogeneous mixture of two or more substances.

Answer:

a solute is dissolved to find a solution

Explanation:

help


Nicole has 2 glasses on the counter: one of water and one of sugar-water. She is baking a cake and needs to use the sugar-water for the glaze. Both glasses look identical, but one contains a mixture and the other contains a compound.

Is sugar-water a mixture or a compound? Define mixtures and compounds, and explain how, without tasting it, Nicole can test to make sure she is using the sugar-water in the glaze.

Answers

Answer:

sugar-water is a mixture not a compound.(homogeneous mixture.)

Explanation:

Compounds are substances formed by the chemical combination of two or more elements. Mixtures are substances formed by physically mixing two or more substances together.

The solution of sugar in water is considered a mixture not a compound because the particles of sugar and water are not completely dissolve nor mixed in a fixed proportion or ratio. hope this helped :)

Explain how, without tasting it, Nicole can test to make sure she is using the sugar-water in the glaze.

Answer: Nicole can take a small amount of sample from both of the glasses, she can place the samples in two separate containers and leave them out in the sun, so that the water gets evaporated. One of the two containers will contain a residue of sugar. The one containing the sugar residue, is the sugar-water solution.

Help please help help

Answers

Sugar and light is your answer

Determine the concentration of the sodium hydroxide solutions after being exposed to
air at different time intervals (1, 2, 3, 4 and 5 days).( your answer need to be to 3
decimal places ) show your work

Answers

Answer: I don’t know sorry!

Explanation:

To determine the concentration of the sodium hydroxide (NaOH) solutions after being exposed to air at different time intervals, we need additional information about the initial concentration of the solutions and whether any reactions or changes occur during the exposure to air.

Without knowing the initial concentration and the specific conditions of the exposure to air, it is not possible to provide a precise answer. Additionally, the concentration of NaOH can change over time due to reactions with carbon dioxide (CO2) in the air, which can lead to the formation of sodium carbonate (Na2CO3) and water (H2O).

If you have the initial concentration of the NaOH solutions and information about the specific conditions of exposure to air, please provide that data, and I'll be happy to assist you in calculating the concentration at different time intervals.

Methane (CH4) combines with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O). Describe the number and type of atoms for a molecule of each substance.
HELP (thanks if you give a good/correct answer)

Answers

Answer:

A molecule of methane (CH4) contains 1 carbon atom and 4 hydrogen atoms. A molecule of oxygen gas (O2) contains 2 oxygen atoms. A molecule of carbon dioxide (CO2) contains 1 carbon atom and 2 oxygen atoms. A molecule of water (H2O) contains 2 hydrogen atoms and 1 oxygen atom.

how can a black bear family have different colors?

(please help, I have to turn it in tomorrow and my science teacher is very very strict.)

Answers

Black bears can have different colors due to their habitat and adapting to their environment. The different colors in a family of bear is most likely due to a genetic variant that is similar to what causes albinism in humans. A mutation in a gene will cause an alteration in the coats pigmentation causing a different color fur.
yes due to their environment and habitat

The article states, "No matter what phase the Moon is in, one thing is the same: half of the Moon ______________.

Answers

Answer:

is covered in shadow/is dark

Explanation:

The moon will always have at least half of the moon covered, even if there is more than that. I you have a full moon, you are only being shown the face of the moon that is facing you, meaning the other side is covered by shadow, from there on the rest of the sequence is smaller than a full moon, but there will always be AT LEAST half the moon showing.

The dark I think so

Which of the following is NOT a cost of using fossil fuels?

Answers

Answer: Burning fossil fuels decreases CO2 in the atmosphere

Explanation: Burning fossil fuel actually increases the amount of CO2 in the atmosphere, it doesn't decrease it.


Hope this helps!

It will be B
Burning fossil fuels decreases co2 in the atmosphere
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