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15
×
In a mixture of iron and sulfur, the substances are not chemically bonded.
True
False
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15
×
X-ray fluorescence helps scientists:
Detect hidden objects
Measure radiation
Identify elements in materials
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15
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What happens when magnesium burns in oxygen?
The oxygen is destroyed
It creates a new compound with different properties
Nothing changes
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15
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A student mixes iron and sulfur and notices they can be separated with a magnet. What does this tell us?
Iron turned into sulfur
Itâs still a mixture
They formed a compound
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15
×
A particle diagram would typically show:
How atoms rearrange during reactions
The weight of elements
The temperature of a reaction
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15
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An element is a pure substance made up of atoms of the same kind.
True
False
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15
×
Evaporation and crystallization are methods to separate salt from salt water.
False
True
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heart
Other team wins 25 points!
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seesaw
Swap points!
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gift
Win 25 points!
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baam
Lose 25 points!
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heart
Other team wins 25 points!
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gold
Win 50 points!
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shark
Other team loses 25 points!
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baam
Lose 20 points!
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15
×
What is a solute?
The liquid that dissolves a solid
The leftover mixture
The substance being dissolved
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eraser
Reset score!
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rocket
Go to first place!
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rocket
Go to first place!
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lifesaver
Give 20 points!
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15
×
What is a compound?
A pure substance formed from two or more elements chemically bonded
A single type of atom
A physical blend of substances
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15
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When iron and sulfur combine, they form:
A gas
Iron sulfide
A mixture
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15
×
Which part of a chemical equation shows the new substances formed?
Elements
Products
Reactants
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15
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Which of these is an example of a physical change?
Dissolving salt in water
Cooking an egg
Burning paper
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15
×
Which statement about elements is TRUE?
Elements can be easily broken down
Elements always exist as liquids
Elements are the simplest form of matter
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