diversity

Question 1

what are elements

Answer 1

element is a pure chemical substance that cannot be broken down into 2 or more simpler substances by chemical means

Question 2

what is the difference between a monatomic gas and a diatomic gas

Answer 2

a monatomic gas is a gas that can exist on its own, as one particle. however, a diatomic gas exists as 2 particles, eg o2.

Question 3

what type of atoms are in group 17

Answer 3

halogens

Question 4

what type of metals are in group 1

Answer 4

alkali metals

Question 5

what type of gases are in group 18

Answer 5

noble gases

Question 6

what can i say about the aroms in the same grou

Answer 6

all atoms in the same group have SIMILAR chemical properties

Question 7

what are some characteristics of a metal

Answer 7

metals are strong, shiny, ductile, hard, high density, solid and good conductors of heat and electricity

Question 8

what is a compound

Answer 8

a compound is a pure chemical substance formed when two or more elements are chemically combined in a fixed ratio to forma new product.

Question 9

what are some characteristics of a compound

Answer 9

a compound is made of two or more substances thru chemical processes. the compound has a different and new set of properties from its original elements.

Question 10

what are mixtures

Answer 10

mixtures are impure substances made of two or more components that are mixed TGT, in a random ratio.

Question 11

what are some characteristics of a mixture?

Answer 11

a mixture can be separated by physical means. it is impure, therefore it will boil and melt over a range of temperatures. the mixture has the properties of its components and has no definite formula. there are 2 types of mixtures, heterogeneous and homogenous

Question 12

what is the difference between a solution and a suspension?

Answer 12

a solution is a solid that can be dissolved in its solvent, therefore the solution is transparent. a suspension is a solvent and an undissolvable solute. therefore the mixture is not transparent.

Question 13

what is a heterogeneous mixture

Answer 13

it is the same as a suspension, it is a mixture in which inslouble particles are suspended in a liquid or gas.

Question 14

what is a homogenous mixture

Answer 14

it is the sam3 as a solution, it is transparent and the solute can be dissolved.

Question 15

what is solubility

Answer 15

it is the maximum amount of solute that can be dissolved in a certain amount of solvent

Question 16

what are the main factors affecting solubility

Answer 16

the nature of the solvent, meaning how many solvents. [100g/200g]

• the nature of the solute
• the temperature, higher temperature easier to dissolve a solid, lower temperature easier to dissolve gas
• the physical state of the solute [gas/ solid/ liquid]

Question 17

what is the rate of dissolving

Answer 17

how fast a substance dissolves

Question 18

what are the main factors affecting rate of dissolving

Answer 18

the size of the particles[ the surface area]
the amount of solute already dissolved
temperature

Question 19

how can you tell the difference between an impure substnace and a pure substance

Answer 19

an impure substance will boil and melt over a range of temperatures, while a pure substnce will boil and meltr at a sharp temperature

Question 20

what method should be used to separate a insoluble solid from a mixture

Answer 20

the filtration method

Question 21

what is the solvent collected at the end of the expirement called

Answer 21

its called the filtrate

Question 22

what method is used to separate a soluble solid from a mixture

Answer 22

the method is evaporation tro dryness, for heat stable.

for heat unstable solutes, use crystallisation

Question 23

for liquid liwuid mixtures what method of separation is used

Answer 23

use fr