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timofeeve [1]
3 years ago
5

3. Matter with a composition that is always the same is a(n) substance mixture compound

Chemistry
1 answer:
Andre45 [30]3 years ago
7 0

Answer:

substance

Explanation:

A pure substance is a form of matter that has a constant composition (meaning it's the same everywhere) and properties that are constant throughout the sample (meaning there is only one set of properties such as melting point, color, boiling point, etc

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What mass of magnesium oxide is produced when 60g of magnesium is burnt in air?
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Answer:

The chemical equation can be written as:

2Mg+O

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→2MgO

48 g of Mg reacts with 32 g of O

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Thus, 4.8 g of Mg reacts with 3.2 g of O

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Now, 32 g of O

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forms = 80 g of MgO.

3.2 g of O

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produces =

32

80

×3.2 = 8 g of MgO.

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