Chap 1.1

Question 1

Atom meaning?

Answer 1

Smallest part of an element that has properties of the element.

Question 2

Term element mean? example

Answer 2

They are chemically the simplest substance, that’s why they cant be broken down using chemical reaction.

Question 3

Term ion meaning? example

Answer 3

Consists of one or more atoms joined together and having a positive and a negative charge.

Question 4

Term Molecule meaning? example

Answer 4

Contains two or more atoms of same element.

Question 5

Term compound meaning? example

Answer 5

These contains atoms of two or more different elements.

Question 6

Element made up of single atom known as?

ex; He

Answer 6

Monoatomic

Question 7

Elements and compound made up of two atoms together is? ex; N2

Answer 7

Diatomic

Question 8

Element and compound along with molecule made up with several atoms together is? ex; CH4

Answer 8

Polyatomic

Question 9

write molecule example.

Answer 9

H2, H2O

Question 10

write ion example.

Answer 10

H+, Al^3+

Question 11

write atom example.

Answer 11

H, S

Question 12

write Avogadro’s number definition and formula.

Answer 12

6. 02x10^23, the number of particle in one mole of a substance.
   formula: no.of particle= L x no.of mole

Question 13

Cancelled ions are called?

Answer 13

spectator ions

Question 14

all group 1 metals are?

Answer 14

soluble

Question 15

all ammonium compound are?

Answer 15

soluble

Question 16

all nitrates are?

Answer 16

Soluble

Question 17

all chlorides are?

Answer 17

soluble except AgCl, PbCl2

Question 18

all sulfates are?

Answer 18

soluble except SrSO4, BaSO4, PbSO4

Question 19

all carbonates are ?

Answer 19

insoluble except group1 carbonate and Al2(CO3)3

Question 20

all hydroxides are?

Answer 20

insoluble except group 1 hydroxide, ammonium hydroxide, barium hydroxide

Question 21

Cl, Br, I are soluble except?

Answer 21

Ag, Pb^2+, (Hg2)^2+

Question 22

Relative molecular/formula mass

Answer 22

the sum of the relative atomic masses of all the atoms present in the formula of a compound.
(mass of compound)

Question 23

Molar mass and formula

Answer 23

~the mass of one mole of a substance
~it has the same numerical value as the relative mass
~molar mass= mass/amount in mo

Question 24

relative molecular/formula mass

Answer 24

the relative atomic mass of an element is the average mass of one atom of the element relative to 1/12th the mass of one atom of carbon-12.
formula; mean mass of an atom of an element divided by 1/12th of the mass of an C-12.

Question 25

Gases in the atmosphere (ppm)

(used to describe chemical concentration

Answer 25

~the number of parts of one substance in one million parts of another substance.
~’parts’ refer to masses of both substance or volume of both substance

Question 26

solution in ppm formula

Answer 26

concentration in ppm= mass of solute x 10^6/ mass of solvent

Question 27

concentration in 1 ppm means?`

Answer 27

1g in 10^6g or 1mg in 10^6mg

Question 28

solute?

Answer 28

salt

Question 29

solvent?

Answer 29

water

Question 30

solution?

Answer 30

salt water

Question 31

gases in ppm formula

Answer 31

concentration in ppm= volume of gas x 10^6/ volume of air

Question 32

ppm full form?

Answer 32

parts per million

Question 33

ppmv means?

Answer 33

v shows value refers to concentratin by volume

Question 34

concentration in 1 ppmv means?

Answer 34

1 cm^3 in 10^cm^3 or 1cm^3 in 10^3 dm^3