6.5def Test Review

Which of the following best describes how atoms form new substances?

• Atoms combine by sharing or transferring electrons to form new substances.

• Atoms merge into a single atom to form new substances.

• Atoms change their identity to form new substances.

• Atoms disappear and reappear as new substances.

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VA.6.5.d

What is the chemical formula for water?

Tags

VA.6.5.e

Which example shows an equation that is equal on both sides? Remember if it's on one side then it has to be on the other side!

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VA.6.5.f

Which of the following statements is true about chemical bonds?

• Chemical bonds are formed by the physical mixing of atoms.

• Chemical bonds involve the electrical forces between atoms.

• Chemical bonds are temporary and do not affect the properties of substances.

• Chemical bonds are only found in gases.

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VA.6.5.d

• One carbon atom and two oxygen atoms

• Two carbon atoms and one oxygen atom

• One carbon atom and one oxygen atom

• Two carbon atoms and two oxygen atoms

Tags

VA.6.5.e

Which chemical formulas show subscripts?

• NaCl

• CO

A substance made up of two or more atoms is called _______.

• a compound

• an element

• an atom

• a molecule

Tags

VA.6.5.f

Which of the following best describes a compound?

• A substance made of two or more elements chemically combined in a fixed ratio

• A mixture of different elements that can be separated physically

• A single element in its pure form

• A group of atoms that are not chemically bonded

Tags

VA.6.5.e