Chapter 2 vocab

Question 1

A substance that cannot be broken down to other substances by ordinary chemical means.

Answer 1

Element

Question 2

A substance consisting of two or more different elements combined in a fixed ratio.

Answer 2

Compound

Question 3

The smallest unit of matter

Answer 3

Atom

Question 4

A subatomic particle with a single negative charge

Answer 4

Electron

Question 5

The number of shells around the nucleus.

Answer 5

Electron shells

Question 6

Bonds that form when two elements share electron

Answer 6

Chemical bond

Question 7

Two or more atoms held together by covalent bonds

Answer 7

Molecules

Question 8

A measurement of an atom’s attraction for shared electrons

Answer 8

Electron negativity

Question 9

Form when two atoms has differ electronegativity

Answer 9

Polar covalent bond

Question 10

The bond in the water molecules

Answer 10

Hydrogen bonds

Question 11

The results in the chemical reactions

Answer 11

Products

Question 12

The element that have the same number of protons but with a different number of neutrons

Answer 12

Isotope

Question 13

Thermal energy in transfer from a warmer object to a cooler object.

Answer 13

Heat

Question 14

How hot or how cold sth is

Answer 14

Temperature

Question 15

The thing consists of two or more substance

Answer 15

Solvent

Question 16

The one which water is the solvent

Answer 16

Aqueous solution

Question 17

A substance that reduce the hydrogen ion concentration of a solution

Answer 17

Base

Question 18

The acidity of a liquid

Answer 18

PH scale

Question 19

The substance that minimize changes in pH

Answer 19

Buffer

Question 20

The transfer of electrons between the atoms

Answer 20

Ionic bond