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nika2105 [10]
3 years ago
7

When heat energy is added, two changes are observed: Change A: Solid changes to a liquid. Change B: Solid changes directly to a

gas. What are the names for phase changes A and B?
a-- A is freezing and B is condensation.

b--A is freezing and B is sublimation.

c-- A is melting and B is condensation.

d--A is melting and B is sublimation.

THE ANSWER IS D
Chemistry
2 answers:
Inessa05 [86]3 years ago
7 0

Answer:

The answer is d-- A is melting and B is sublimation.

Explanation:

A is melting because a solid is changing into a fluid and B is sublimation because a solid changing straight into a gas.

guajiro [1.7K]3 years ago
3 0

Answer:

D) A is melting and B is sublimation.

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How many grams of NH3 can be produced from 12.0g of H2?
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Answer:

Balanced reaction:

3 H2 (g)  + N2 (g)  → 2 NH3 (g)

Use stoichiometry to convert g of H2 to g of NH3.  The process would be:

g H2 → mol H2 → mol NH3 → g NH3

12.0 g H2 x (1 mol H2 / 2.02 g H2) x (2 mol NH3 / 3 mol H2) x (17.03 g NH3 / 1 mol NH3) = 67.4 g NH3

Explanation: See above

Hope this helps, friend.

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2 years ago
From these four cycles which are water cycle, carbon cycle, nitrogen cycle, and phosphorus cycle which cycle has more nutrients
agasfer [191]

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Explanation:

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4 years ago
How much heat is gained when a 50.32g piece of aluminum is heated from 9.0°c to 16°c
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Answer: 317 joules

Explanation:

The quantity of heat energy (Q) gained by aluminium depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

In this case,

Q = ?

Mass of aluminium = 50.32g

C = 0.90J/g°C

Φ = (Final temperature - Initial temperature)

= 16°C - 9°C = 7°C

Then, Q = MCΦ

Q = 50.32g x 0.90J/g°C x 7°C

Q = 317 joules

Thus, 317 joules of heat is gained.

5 0
4 years ago
Read 2 more answers
Please Help me
dangina [55]
Democritus was the first to propose the idea of the atom. He said the atom was just this tiny, solid sphere. However, he used no scientific evidence to support his claim, so a guy named John Dalton did some experimenting and basically backed up Democritus' claim with evidence. Then, a guy named J.J. Thompson came along and said the atom was not solid and that is consisted of tiny negatively charged particles(electrons) and he came up with the Plum Pudding model which is just a tiny sphere with a punch of random scattered dots in it. After that, Ernest Rutherford did experiments and found that the tiny sphere is made up of mostly empty space with a tiny, dense, positively charged sphere inside of it, and the negatively charged particles just randomly float around it. Neils Bohr then said that the electrons take specific, circular, evenly spaced paths. Then, finally, we come to the Quantum Mechanical Model which is the one accepted today. This model basically vetos Bohr's idea and has a nucleus inside of an electron cloud, which is where the electrons are found.
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4 years ago
Cytotoxic t cells can attack target cells with which chemical weapons?
Aneli [31]

Answer:

secrete cytotoxic substance which triggers apoptosis of target cell.

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