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15
×
Which statement about atoms and molecules is correct?
Elements always exist as pairs of atoms called molecules
Elements always exist as separate atoms
Elements and compounds can exist as molecules
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thief
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25
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gift
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fairy
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thief
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15
×
Which of the following is not an element?
oxygen
Hydrogen
carbon dioxide
magnesium
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thief
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gift
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gift
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baam
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eraser
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gift
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shark
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thief
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15
×
Which of the following diagrams shows a mixture?
C only
A and C
D only
A only
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15
×
Which of the following are elements?
A and C
B and D
B only
D only
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15
×
Which word means a substance that contains 2 or more different atoms that are chemically joined?
mixture
compound
element
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15
×
How many different atoms are there in a compound?
1
3
2 or more
2
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15
×
Which word means a substance that contains only one type of atom?
mixture
particle
element
compound
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15
×
Which word means a substance that contains different types of particles that are not chemically joined?
element
mixture
compound
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15
×
Which word means a single sphere that makes up matter?
atom
particle
piece
molecule
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15
×
How many different elements are there in CO2?
1
3
2
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15
×
Which element has the symbol He?
helium
hydrogen
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15
×
Which of the following diagrams contain compounds?
B only
A only
A and C
D only
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15
×
Which word means 2 or more atoms (that could be the same or different) that are chemically joined together?
compound
molecule
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