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3 years ago

Which of the following describes the relationship correctly?

2 answers:

8 0

A. Air expands, becomes less dense and rises when the temperature is high due to the increased kinetic energy. This causes the air molecules to move around much more so they are further apart.

SOVA2 [1]3 years ago

8 0

Answer: Option (A) is the correct answer.

Explanation:

Density is defined as the degree of compactness or mass per unit volume of a substance.

When air expands then it means its molecules have gained kinetic energy. Therefore, they are colliding with each other and result in expansion of air.

So, expansion makes air less dense as mass per unit volume decreases on expansion. Therefore, air rises on expansion.

Thus, we can conclude that air expands, becomes less dense, and rises describes the relationship correctly.

You might be interested in

How many formula units are in 6.12 kg of lithium nitride

BartSMP [9]

There is 213 units i believe hope so

7 0

3 years ago

Calculate the oxidation number of the iodine (I) in each compound: HIO4 = I2 = NaI = HIO3 =

Alisiya [41]

1) in periodic acid (HIO₄), iodine has oxidation number +7, hydrogen has oxidation number +1, oxygen has -2, compound has neutral charge:
+1 + x + 4 · (-2) = 0.
x = +7.

2) in molecule of iodine (I₂), iodine has oxidation number 0, because iodine is nonpolar molecule.

3) in sodium iodide (NaI), iodine has oxidation number -1, sodium has oxidation number +1:
+1 + x = 0.
x = -1.

4) in iodic acid (HIO₃), iodine has oxidation number +5, hydrogen has oxidation number +1, oxygen has -2, compound has neutral charge:
+1 + x + 3 · (-2) = 0.
x = +5.

3 0

3 years ago

Read 2 more answers

Assume that the half-life of an M&M is 15 seconds A. you start with M& M's, how many would be left unchanged after 1 min

Nata [24]

Answer:

See below

Explanation:

1 minute is 4 halflives ( because 4 x 15 sec = 1 minute)

(1/2)^4 = 1/16

you will have 1/16 as many M&M as you started

7 0

2 years ago

A laboratory bottle of helium gas occupies a volume of 2.0 L at 760 mm Hg. Calculate the new pressure if the

Fantom [35]

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

$P_1V_1 = P_2V_2$

Since we are finding the new pressure

$P_2 = \frac{P_1V_1}{V_2} \\$

From the question we have

$P_2 = \frac{2 \times 760}{1.8} = \frac{1520}{1.8} \\ = 844.4444...$

We have the final answer as

Hope this helps you

8 0

3 years ago

Consider the balanced equation for the following reaction:

wel

Answer:

The amount of ammonia needed is 33.3 g

Therefore, we can also say 1.96 moles of NH₃

Explanation:

The reaction is: 3CuO(s) + 2NH₃(g) → 3H₂O(l) + 3Cu(s) + N₂(g)

If we see stoichiometry, 3 moles of water can be produced by 2 moles of NH₃. We propose this rule of three:

3 moles of water can be produced by 2 mole of ammonia

Then, 2.94 moles of water, must be produced by (2.94 . 2) /3 =1.96 moles of NH₃

If we convert the moles to mass. 1.96 mol . 17 g /1mol = 33.3 g

4 0

4 years ago