change p1

Question 1

element

Answer 1

substance that cannot be broken down into simpler substances by chemical methods
an element that is a substance that consists of only 1 type of atom which may be joined together

Question 2

compound

Answer 2

pure substance that contains two or more different chemically combined in a fixed ratio
consists of one type of particle(s) that are made up of the same type of atoms combined in the ratio

Question 3

mixture

Answer 3

consists of 2 or more substances that are not chemically combined
can be made out of different elements only/different compounds only/element and compounds put tgt

Question 4

colloid

Answer 4

substance microscopically dispersed evenly throughout another substance

Question 5

atom

Answer 5

smallest unit of an element that has the properties of that element

Question 6

molecule

Answer 6

made up of 2 or more atoms chemically combined tgt

Question 7

soluble

Answer 7

substance that can dissolve in a solvent

Question 8

filtrate

Answer 8

substance able to pass through the filter paper

Question 9

residue

Answer 9

substance unable to pass through the filter paper

Question 10

solute

Answer 10

substance that is being dissolved

Question 11

solvent

Answer 11

substance that dissolve others

Question 12

miscible

Answer 12

soluble in one another

Question 13

immiscible

Answer 13

insoluble in one another

Question 14

metals

Answer 14

shiny
high melting and boiling points except for mercury
solids at room temperature except mercury
electrical and thermal conductivity is good
is malleable (can be hammered into other shapes without breaking )

Question 15

non-metals

Answer 15

dull
melting and boiling points are low except for diamond, graphite
mostly liquids / gases at room temperature
electrical and thermal conductivity is poor except for graphite
is brittle(shatter / break when hammered )

Question 16

periodic table

Answer 16

vertically is a group, horizontally is a period ,zig-zag lines are present too
every element has a name and symbol
first letter of the element symbol is always a capital letter while the second one is a lowercase
zig zag separates metals rom non-metals
8 groups in table e.g. I II III IV V VI VII and 0, must be written using roman numerals

Question 17

compounds (more things )

Answer 17

formed when chemical reaction takes place . during the process, heat and light are given out and new product(s) w different properties are formed
mp and bp are fixed
has different properties from the elements it consists of
can only be separated by chemical methods

Question 18

mixture

Answer 18

consists of 2 or more substances that are not chemically combined, has no fixed ratio
mp and bp varies over a range of temps
has same properties as the substances it is mace up of
can be separated by physical methods

solutions and suspensions are example of mixtures, e.g. solute + solvent = solution

Question 19

solution

Answer 19

mixture of a solute dissolved in the solvent
particles are evenly spread out so that every part of solutions has the same properties
colour, density, appearance and other properties are the same in every part of the solution

Question 20

suspension

Answer 20

mixture containing insoluble fine solid particles in a liquid or gas
insoluble particles tend to sink when the mixture is left to stand due to gravity
colour, density , appearance and other properties are different in every part of the solution

Question 21

colloids

Answer 21

mixture where particle size is intermediate between that of a solution and suspension.
dispersed particles are spread evenly throughout the dispersion medium, which can be a solid, liquid or gas
bc dispersed particles of colloid are not as large as those of a suspension ,they do not settle out upon standing
example is paint, blood and milk
solution particle size-0.01-1nm , atoms, ions or molecules
colloids particle size- 1-1000NM; dispersed; large molecules or aggregates