Chem definations

Question 1

Element

Answer 1

substance that cant be borken down

Question 2

compond

Answer 2

substance that can be broken down

Question 3

base

Answer 3

produce positively charged metal ions, and negatively charged hydroxide ions. when desolved in water

Question 4

ion

Answer 4

charged atom that has lost or gained elections

Question 4

atom

Answer 4

smallist unit

Question 5

acid

Answer 5

Substances that produces hydrogen ions (H+ ) when dissolved in water.

Question 6

coefficient

Answer 6

a number written in front of a chemical symbol or formula; indicates the number of atoms or molecules of that substance.

Question 7

physical change

Answer 7

the composition stays the same

Question 8

chemical changce

Answer 8

change in starting chemical + 1 or more new substances

Question 9

ph scale

Answer 9

A scale to measure the relative acidity or basicity

Question 10

valence shell

Answer 10

last energy shell

Question 11

molecule

Answer 11

2 or more atoms chemically combined

Question 12

ionic compound

Answer 12

metal + non metal

Question 13

polyatomic ion

Answer 13

covalent bonded set of two or more atoms

Question 14

molecular compund

Answer 14

non metal +non metal

Question 15

matter

Answer 15

anything that has masxs and takes us space

Question 16

cation

Answer 16

atom with a positive charge

Question 17

anion

Answer 17

atom with negative charge

Question 18

binary acids

Answer 18

hydrogen combines with a non-metal

Question 19

oxyacid

Answer 19

hydrogen combines with polyatomic ions that contain oxygen.

Question 20

indicator

Answer 20

A substance used to distinguish between acidic and basic solutions

Question 21

Law of Conservation of Mass

Answer 21

The mass of the reactants in a chemical reaction must equal the mass of the products