Basic Concepts in Chemistry lesson2

Question 1

Atom

Answer 1

basic unit of matter.

Question 2

H

Answer 2

hydrogen

Question 3

C

Answer 3

carbon

Question 4

Na

Answer 4

sodium

Question 5

K

Answer 5

potassium

Question 6

Ca

Answer 6

calcium

Question 7

Mg

Answer 7

magnesium

Question 8

Fe

Answer 8

iron

Question 9

O

Answer 9

oxygen

Question 10

N

Answer 10

nitrogen

Question 11

Cl

Answer 11

chlorine

Question 12

F

Answer 12

flouride

Question 13

S

Answer 13

sulfur

Question 14

P

Answer 14

phosphorus

Question 15

The difference between atoms/ elements is..

Answer 15

..the number of protons, neutrons, and electrons

Question 16

Atomic number

Answer 16

number of protons in the nucleus

Question 17

mass number

Answer 17

number of protons and neutrons combined

Question 18

Isotope

Answer 18

an atom/element with non-equal numbers of protons and neutrons.
Produce nuclear radiation and decay.

Question 19

Ion

Answer 19

atom with number of electrons unequal to number of protons in the nucleus

Question 20

Cation

Answer 20

positively charged ion

Question 21

Anion

Answer 21

negatively charged ion

Question 22

Molecule

Answer 22

2 or more atoms which are bonded by a chemical bond.

Question 23

Mole

Answer 23

an amount of substance, made of a number of atoms equal to Avogadro’s number= 6.02 × 10^23

Question 24

a solution is a mixture of..

Answer 24

..a solvent and a solute.

Question 25

Molar

Answer 25

number of moles of a solute in 1 liter of a solvent. Moles per/liter