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3 years ago

Which of the following are phase changes? Select all that apply.

Chemistry

2 answers:

lidiya [134]3 years ago

5 0

Answer: Options A, B, C, and D are all representing phase changes.

Explanation:

Phase change means change in the state of a substance from one form to another that is change of a liquid into solid, liquid into gas and vice versa.

In liquid freezing, the liquid is changing into solid so here phase is changing.

In solid melting, solid is changing into liquid so here phase is changing.

In ice melting, solid is changing into liquid so here phase is changing.

In sublimation of a solid, the solid changes to gas without changing into liquid. So, here also phase is changing.

When paper is burning, it is a chemical change as a new substance is formed which cannot be reversed into paper again.

Therefore, options A, B, C, and D are all representing phase changes.

kogti [31]3 years ago

4 0

A, B, C, and D, because they are changing from a solid to a liquid, liquid to solid, and solid to gas. Phase changes are when a solid, liquid, or gas, turns into a solid, liquid, or gas. Ex. Ice melting is a solid changing into a liquid. Hope this helps!

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Magnesium sulfate heptahydrate is heated until all the water is driven off. The sample loses 11.80 grams upon heating. What was

iren [92.7K]

Hello!

The initial mass of Magnesium Sulfate Heptahydrate (MgSO₄·7H₂O) is 23,08 g

The chemical reaction for the dehydrating of Magnesium Sulfate Heptahydrate (MgSO₄·7H₂O) is the following:

MgSO₄·7H₂O(s) + Δ → MgSO₄(s) + 7H₂O(g)

We know that the sample loses 11,80 g upon heating. That mass is the mass of Water that is released as vapor. Knowing that piece of information, we can apply the following conversion factor to go from the mass of water to the moles of water and back to the mass of the original compound (mi).

$mi=11,80gH_2O* \frac{1 mol H_2O}{18gH_2O}* \frac{1molMgSO_4.7H_2O}{7molH_2O}* \frac{246,47 g MgSO_4.7H_2O}{1 mol MgSO_4.7H_2O} \\ \\ mi=23,08gMgSO_4.7H_2O$

Have a nice day!

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3 years ago

Neptune's Triton is being pulled closer and closer to the planet as it orbits. What will likely be a result of this gravitationa

Ksenya-84 [330]

Answer:

the planet's gravity will cause Triton to fly into Neptune

Explanation:

Gravitational force is a force of attraction between two bodies with considerable masses.

One of the mass tends to pull the other to it's center.

As the force of gravity between two bodies grow, the more massive body will be drawn to the other one.

The effect is that one body will eventually collide with the other.
Since the planet pulls very hard on its moon
On the long run, we can expect Triton to fly into Neptune in the foreseeable future.

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3 years ago

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GalinKa [24]

Answer:

Explanation:

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2 years ago

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musickatia [10]

Answer:

Use either a vinegar, Borax, or bleach solution in a spray bottle to tackle the mold. Simply spray the solution on showers, baths, basins, tiles, grout, or caulking. Then use either a cleaning cloth or a toothbrush to remove the slime

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3 years ago

If an atom has 6 valence electrons, how many electrons does it need to gain to achieve a stable electron configuration?

shusha [124]

it would need to gain 2 more for it to achieve a stable configuration

the best way to remember this is the noble gasses all have 8 valence electrons and that they are the most stable elements on the periodic table

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3 years ago

Read 2 more answers