Chemistry

Question 1

Atomic Number

Answer 1

Chemical element is the number of protons in the nucleus.

Question 3

Mass number

Answer 3

Chemical number is the number of protons plus neutrons .

Question 4

Isotopes

Answer 4

Same atomic numbers but different mass numbers.

Question 5

Protons

Answer 5

Positively charged

Question 6

Neutrons

Answer 6

No charge

Question 7

Electrons

Answer 7

Negative charged

Question 8

Ions

Answer 8

Electrically charged particles

Question 9

Positively charged ions are called

Answer 9

Cations

Question 10

Negatively charged ions are called

Answer 10

Anions

Question 11

Ba2+ is

Answer 11

Cation

Question 12

S2- is

Answer 12

Anion

Question 13

Metalloids

Answer 13

Have non metallic and metallic properties.

Question 14

Name metalloids

Answer 14

B , Si , Ge , As , Sb , Te , Po

Question 15

Monatomic ions

Answer 15

Are ions which contain only one atom

Question 16

Polyatomic ions

Answer 16

Are ions that contain more then one atom.

Question 17

What is Binary compound ?

Answer 17

Consists of 2 different elements.

Question 18

What does amu stand for?

Answer 18

Atomic Mass Unit

Question 19

How does metals react ?

Answer 19

By losing electrons and form cations

Question 20

How does alkali metals react?

Answer 20

Lose one electron to form a monoatomic cation.

Question 21

How does alkali earth metals react ?

Answer 21

Lose 2 electrons

Question 22

How does transition metals react?

Answer 22

Form more than one cation

Question 23

Do noble gases form ions ?

Answer 23

They don’t

Question 24

What are 2 common polyatomic cations?

Answer 24

NH4+ ammonium ion and Hg22+ mercury ion

Question 25

What is an oxyanions ?

Answer 25

Are polyatomic ions that contain oxygen. They form more than one oxyanion each contain different number of oxygen atoms.

Question 26

Most common oxyanion is ....

Answer 26

Cl3- chlorate

Question 27

Binary molecular compounds

Answer 27

Composed of 2 non metals or metalloids are usually molecular and are named using a prefix system.

Question 28

Name CO3

Answer 28

Carbon trioxide

Question 29

Name the order of elements

Answer 29

B,Si,Sb,As,P,N,H,Te,Se,S,I,Br,Cl,O,F

Question 30

Name properties of ionic compounds

Answer 30

High bioling points , high melting points , solids at room temperature, conduct electricity in molten state and soluble in water.

Question 31

Name properties of molecular compounds

Answer 31

Low boiling points, low melting points , gasses / liquid at room temperature, do not conduct electricity, soluble in organic solvents.

Question 32

Hydrates

Answer 32

Are compounds that contain water molecules that are weakly bound to the crystals.