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asambeis [7]
3 years ago
14

An example of a change of state is __________. *

Chemistry
2 answers:
tankabanditka [31]3 years ago
7 0
Changes of state are physical changes in matter. They are reversible changes that do not change matter's chemical makeup or chemical properties. For example, when fog changes to water vapor, it is still water and can change back to liquid water again.please mark brainliest if correct
NeX [460]3 years ago
3 0

Answer:

ice cube melting

Explanation:

bcoz it's a chemical change

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Which of the following measurements contains 2 significant figures?
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The energy required to break existing chemical bonds in reactants is called the ______ energy.
mixer [17]

The energy required to break existing chemical bonds in reactants is called the activation energy.

<h3>What is activation energy?</h3>

Activation energy in chemistry is the energy required to initiate a chemical reaction.

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8 0
2 years ago
How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
zmey [24]

Answer:

134.4 g of Mg

Explanation:

reaction:

2Mg + O2 ➡️ 2MgO

1) find the mol of MgO

mol = mass / molar mass

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