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laila [671]
3 years ago
8

When heat energy is added two changes are observed: Change A: solid changes phases to a liquid Change B: liquid changes phases t

o a gas What are the names or phase changes in A and B
Chemistry
2 answers:
AlexFokin [52]3 years ago
8 0
A is melting. Melting occurs when the molecules of a solid speed up enough that the motion overcomes the attractions so that the molecules can move past each other as a liquid.

b is evaporation The molecules move and vibrate so quickly that they escape into the atmosphere as molecules of water vapor
Scilla [17]3 years ago
8 0

Answer:

C) A is melting and B is evaporation.

Explanation:

Solids turn to liquids at high temperatures, and same thing with liquids turning into gases.

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Copper(II) sulfide is oxidized b molecular oxygen to produce gaseous sulfur trioxide and solid copper (II) oxide. The gaseous pr
Tasya [4]

Explanation:

Copper(II) sulfide reacts with oxygen gas to give solid copper(II) oxide and sulfur trioxide gas.

The reaction is given as:

CuS+2O_2\rightarrow CuO(s)+SO_3(g)

When 1 mol copper(II) sulfide react with 2 moles of oxygen gas it gives 1 mol of solid copper(II) oxide and 1 mol of sulfur trioxide gas

The gas formed in above reaction that is sulfur trioxide reacts with water to give sulfuric acid or hydrogen sulfate.

The reaction is given as:

SO_3(g)+H_2O(l)\rightarrow H_2SO_4(aq)

1 mol of sulfur trioxide gas reacts with 1 mol of liquid water to produce 1 molo of liquid hydrogen sulfate or sulfuric acid

3 0
3 years ago
A 5 cm3 piece of aluminum has a higher density than a 10cm3 of aluminum. True or false
Lubov Fominskaja [6]

Density stays the same, false

3 0
2 years ago
Which temperatures originally represented the fixed points<br> Celsius temperature scale?
frez [133]

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Explanation: i no it

8 0
3 years ago
[(1.7x10^6) / (2.62x10^5)]+7.18
egoroff_w [7]
Answer is 13.668! Or in scientific notation it would be .13668 x 10^2
4 0
3 years ago
So3+H2o→H2 So4<br>identify the nature of this reaction​
s344n2d4d5 [400]

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