Science 8 | Chemistry | Unit 9. Material changes Burning

Choose the correct answer.
Ashes contain new
.

color
oxygen
substances
pollution

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substances
color
pollution
oxygen

1/1
Choose the correct answer.
The white powder that results when magnesium burns is
.

magnesium oxide
magnesium chloride
magnesium ions

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magnesium oxide
magnesium ions
magnesium chloride

1/1
Choose the correct answer.
Firework going off is a
change

chemical
physical
state
color

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chemical
physical
color
state

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Iron is an
.

solution
element
compound
atom

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element
compound
atom
solution

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Fill in the blank.
A chocolate that melts at room temperature is a
change
Đáp án
A chocolate that melts at room temperature is a
physical
change
Giải thích

The correct answer
physical
1/1
Choose the correct answer.
The formation of disaccharides from monosaccharides is a
reaction

burning
physical
chemical

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chemical
physical
burning

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Choose the correct answer.
Magnesium and oxygen are
that react to form a compound

elements
compounds
products

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elements
compounds
products

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Choose the correct answer.
Amino acids
to form proteins

combine
separate

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combine
separate

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Choose the correct answer.
When something burns, it reacts with the
in the air

nitrogen
oxygen

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oxygen
nitrogen

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Complete the sentence.
Ashes are produced through
.
Đáp án
Ashes are produced through
burning
.
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burning
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Complete the sentence.
Burning is a
reaction
Đáp án
Burning is a
chemical
reaction
Giải thích

The correct answer
chemical
1/1