Science:Chapter6 definitions Flashcards

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1
Q

What is an atom?

A

*Atom is the smallest particle of matter.
*Atoms of different elements are different sizes.
*Atoms are not made or destroyed in chemical reactions.

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2
Q

What is a molecule?

A

*A molecule is a group of atoms joined together.
*They can take part in chemical reactions.
*The atoms in a molecule do not have to be the same as each other.

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3
Q

What is an element?

A

*Element is a substance made up of only one type of atom.

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4
Q

What is a physical change?

A

A physical change is when atoms form in a new way to give us a mixture but do not create a new substance.

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5
Q

What is a chemical change?

A

A chemical change is when atoms arrange in a different way to give us a new substance called a compound.

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6
Q

What is a substance?

A

A substance is matter that has the same make up and properties throughout.

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7
Q

What is a mixture?

A

A mixture is two or more different substances physically combined;the physical change is easily reversed.

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8
Q

What is a compound?

A

A compound is formed when two or more different elements combine together chemically.This change is very difficult to reverse and new substance is formed.

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