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15
×
In a solid, atoms are tightly packed and can only vibrate in place.
True
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15
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The atomic number of an atom is determined by the number of protons in its nucleus.
True
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15
×
Which of the following describes an isotope?
An atom with a different number of neutrons than protons
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15
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What is one key indicator of a chemical change?
Formation of a new substance (e.g., production of gas, color change, formation of a precipitate).
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boom
Lose 50 points!
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gift
Win 20 points!
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gift
Win 10 points!
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lifesaver
Give 20 points!
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15
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What is the charge of a proton?
Positive (+)
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15
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Electrons are negatively charged particles found inside the nucleus of an atom.
False (do you see why?)
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15
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What is one key difference between a liquid and a gas in terms of particle movement?
In a liquid, particles are in contact but can move past each other; in a gas, particles are far apart and move freely.
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15
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Which of the following best describes the behavior of gas particles?
They move freely and are widely spaced.
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15
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According to kinetic particle theory, what happens to particles in a substance as it is heated?
They vibrate faster and spread apart.
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monster
Reset all scores!
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gold
Win 50 points!
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fairy
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5
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25
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baam
Lose 5 points!
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15
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What is the main difference between a mixture and a compound?
A mixture is a combination of substances that are not chemically bonded, whereas a compound consists of elements that are chemically bonded.
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thief
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5
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25
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rocket
Go to first place!
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rocket
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lifesaver
Give 20 points!
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15
×
What is one method used to separate a mixture of liquids based on their boiling points?
Distillation
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15
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Which of the following best describes a neutron?
A particle with no charge
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15
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How do you calculate the mass number of an atom?
The mass number is the sum of protons and neutrons in the nucleus of an atom.
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