All categories

4 years ago

(PLEASE HELP ASAP)

Chemistry

2 answers:

GalinKa [24]4 years ago

5 0

Answer: Option (c) is the correct answer.

Explanation:

In a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.

Hence, in solid substances the molecules have low kinetic energy. This means that there is very less space between the molecules of a solid substance.

Whereas in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy and some vacant space between each molecule.

In gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions and wide spaces between each molecule.

Thus, we can conclude that when the students modeling as atoms stand or move in the taped-off section then they should all squeeze close together so that there is no vacant space.

pychu [463]4 years ago

4 0

The answer is C because the particles in a solid are so tightly packed that there are no spaces in between them and they cannot move around.

You might be interested in

A gas-filled weather balloon has a volume of 52.0 L at ground level, where the pressure is 751 mmHg and the temperature is

elixir [45]

Using P1V1/T1 = P2V2/T2, 1 being the conditions initially and 2 being the secondary conditions…. always make sure you convert you units first , L=695.8262L

8 0

3 years ago

Select the term that matches each definition:

Zinaida [17]

Answer:

a) common ion effect

b) solubility

c) saturated solution

d) solubility product constant

e) molar solubility

Explanation:

When a substance, say BA2 is dissolved in a solution and another substance CA2 is dissolved in the same solution. The solubility of BA2 is decreased due to the addition of CA2. This is known as common ion effect.

The mass of a substance that will dissolve in a given Volume of solvent is known as it's solubility.

The molar solubility is the amount of moles of solvent that dissolves in 1 dm^3 of solvent.

A solution that contains just as much solute as it can normally hold at a given temperature is known as a saturated solution.

Lastly, the product of molar solubilites raised to the power of the molar coefficient is know as the solubility product constant.

6 0

4 years ago

A chemist must dilute 47.2 mL of 150. mM aqueous sodium nitrate solution until the concentration falls to . He'll do this by add

erma4kov [3.2K]

Answer:

0.295 L

Explanation:

It seems your question lacks the final concentration value. But an internet search tells me this might be the complete question:

" A chemist must dilute 47.2 mL of 150. mM aqueous sodium nitrate solution until the concentration falls to 24.0 mM. He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits. "

Keep in mind that if your value is different, the answer will be different as well. However the methodology will remain the same.

To solve this problem we can<u> use the formula</u> C₁V₁=C₂V₂

Where the subscript 1 refers to the concentrated solution and the subscript 2 to the diluted one.

47.2 mL * 150 mM = 24.0 mM * V₂

V₂ = 295 mL

And <u>converting into L </u>becomes:

295 mL * $\frac{1 L}{1000mL}$ = 0.295 L

6 0

4 years ago

Calculate the number of calories in 1/4 lbs of margarine

dezoksy [38]

The answer is 814.5 :

There is 3258 calories in one pound of margarine (according to google)

one-fourth= 0.25

0.25*3258= 814.5 calories

3 0

3 years ago

Study the trend of the graph from part C. What would the reaction time be if 3 tablespoons (45 milliliters) of water had been us

tatyana61 [14]

Based on the trend from the graph, the reaction time would have been 32.5 seconds.

<h3>What is the trend in the graph?</h3>

A trend is a general pattern which an observation follows based on previous observations and occurrences.

The reaction time is the time it take for a chemical reaction to occur.

Reaction time is also a measure of reaction rate. The shorter the reaction time, the faster the reaction rate and vice versa.

Based on the trend from the graph, the reaction time would have been 32.5 seconds.

In conclusion, reaction time is a measure of reaction rate.

Learn more about reaction time at: brainly.com/question/24795637

#SPJ1

4 0

2 years ago