ChemRx EOU Review

What makes different substances have different properties?

• The number of molecules in the substance

•  The types and arrangements of atoms that make up the substance

• The size of the substance

• The color of the substance

Why do salt and sugar have different properties?

• They are both made of atoms but in different combinations

• They have the same atoms but in different sizes

•  They contain the same elements in the same order

• They are both made only of carbon atoms

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NGSS.MS-PS1-1

Which of the following is NOT a property of a substance?

•  Color

• Mass

• Number of atoms in the universe

• Melting point

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NGSS.MS-PS1-2

Scientists use models to study things that are too...

• Expensive

• Dangerous

• Large or small to see easily

• Boring to study in real life

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NGSS.MS-LS1-2

NGSS.MS-PS1-1

What is the main reason scientists use models of atoms?

•  a) Atoms are too small to see directly

•  b) Atoms change shape too quickly

•  c) Atoms do not actually exist

•  d) Atoms are made of light

Tags

NGSS.MS-PS1-1

Which model best represents how atoms rearrange during a chemical reaction?

•  a) A drawing of the periodic table

•  b) A diagram showing reactant atoms breaking apart and forming new products

•  c) A picture of a rock

•  d) A thermometer measuring temperature

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NGSS.MS-PS1-5

Substances have different properties because they are made of…

•  a) The same atoms arranged in the same way

•  b) Different groups of atoms arranged in specific ways

•  c) The same number of protons and neutrons

•  d) The same molecules but different temperatures

Tags

NGSS.MS-PS1-1

What determines the identity of a substance?

•  a) The shape of the molecules

•  b) The temperature of the substance

•  c) The weight of the substance

•  d) The arrangement and type of atoms in the molecule

Tags

NGSS.MS-PS1-1

Why does water (H₂O) have different properties from hydrogen gas (H₂) and oxygen gas (O₂)?

•  a) Water is colder than hydrogen and oxygen

•  b) Water is made of different atoms

•  c) Water is made of hydrogen and oxygen atoms in a new combination

•  d) Water is a different phase of matter

Tags

NGSS.MS-PS1-1

What is true about substances that have repeating groups of atoms?

•  a) They form patterns at the molecular level

•  b) They contain only one type of atom

•  c) They cannot undergo chemical reactions

•  d) They always have the same shape

Tags

NGSS.MS-PS1-1