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Questão 1
Questão
Which of these is a pure substance?
Responda
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A bar of gold
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Soil
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Blood
Questão 2
Questão
A drop of melted wax falls on a table. It cools and becomes solid. How has it changed?
Responda
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It not longer has a fixed volume
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Its atoms have stopped moving
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It has a fixed shape
Questão 3
Questão
Suppose that you examine an unknown liquid. You determine that it contains a single type of molecule. What is the liquid?
Responda
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A pure substance
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A heterogeneous mixture
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A homogeneous mixture
Questão 4
Questão
An example of evaporation is when:
Responda
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Ice in a freezer slowly forms ice crystals
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Grass wet with dew slowly dries in the morning sunshine
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Just-washed hands are rubbed on a towel
Questão 5
Questão
Which of these is a physical change, not a chemical change?
Responda
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Ripening apples turning red
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Rusting tools become reddish brown
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Painting a cloth red
Questão 6
Questão
As your stomach digests food, this would be considered a:
Responda
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Physical change
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Chemical change
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Matter state change
Questão 7
Questão
Which of the following choices contains only physical properties?
Responda
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mass, color, ability to rust
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ability to be shaped, volume, ability to burn
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ability to break, ability to bend, texture
Questão 8
Questão
As a solid heats up, its particles gain energy and vibrate faster. When they vibrate enough, the particles move away from one another. This describes
Responda
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freezing
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evaporation
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melting
Questão 9
Questão
Which of these has the highest melting point?
Responda
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a stainless steel teaspoon
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ice
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cooking oil
Questão 10
Questão
A red liquid and a yellow liquid are mixed together. The result is an orange liquid that bubbles. This is evidence of
Responda
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physical change
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chemical change
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physical property
Questão 11
Questão
A red and yellow liquid are mixed together. The result is an orange liquid. This is evidence of a
Responda
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physical change
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chemical change
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physical property
Questão 12
Questão
Which of these is a chemical change, not a physical change?
Responda
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A sweater turns purple from a grape juice stain
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Burning wood turns into ashes and smoke
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Bubbles escape from boiling water
Questão 13
Questão
During the phase change lab, the H2O molecules were
Responda
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moving faster and spreading out
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slowing down and getting closer
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becoming more dense
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