Chemistry Review

Question 1

Matter

Answer 1

Anything that takes up space and has mass

Question 2

Element

Answer 2

A substance that cannot be broken into other substances by chemical reactions

Question 3

Compound

Answer 3

Substance consisting of two or more elements combined in a fixed ratio

Question 4

Essential Elements

Answer 4

20-25% of the 92 naturally essential elements are essential to survive and reproduce
Carbon, Hydrogen, Oxygen, Phosphorous, Nitrogen

Question 5

Trace Elements

Answer 5

Required by an organism in very small quantities, (Zinc, Iron)

Question 6

Elements want to be

Answer 6

stable

Question 7

How do elements become stable?

Answer 7

By forming chemical bonds with other elements

Question 8

Chemical bonds

Answer 8

Attraction between two atoms, resulting from the sharing or transferring of valence electrons

Question 9

Electronegativity

Answer 9

Measure of an atoms ability to attract electrons to itself

Question 10

Covalent bonds

Answer 10

When two or more atoms share electrons: single, double, and triple bonds

Question 11

Nonpolar covalent

Answer 11

Electrons shared equally between two atoms

Question 12

Polar covalent

Answer 12

Electrons not shared equally between two atoms

Question 13

Ionic bonds

Answer 13

Attraction between oppositely charged atoms (usually between a metal and non-metal)

Question 14

Cation

Answer 14

Positively charged ion

Question 15

Anion

Answer 15

Negatively charged ion

Question 16

Hydrogen Bonds

Answer 16

The partially positive hydrogen atom in one polar covalent molecule will be attracted to an electronegative atom in another polar covalent atom.

Question 17

Intermolecular bond

Answer 17

Bond that forms between molecules