Atoms, Elements and Compounds

Question 1

Matter

Answer 1

matter is anything that hass a mass and takes up space.(has a volume) basically everything we can see and touch.
-all solids liquids and gasses.

Question 2

the particle theory of matter

Answer 2

all matter is made up of different kinds of particles.

• different substances are made up of types of particles
• particles are in constant random motion
• particles move faster when heated snd slower when cooled.
• particles cannot be created or destroyed.

Question 3

pure substances

Answer 3

made up of only one type of particles.

• any element from te periodic table.
• any compound like distilled water,carbon dioxide CO2(made up of mpre then one element joined together

Question 4

mixures

Answer 4

made up of two or more types of particles

• mechanical-you are able to see the different particles.
• solution-you cannot see the different particles, and you can see theourhg it.

Question 5

alloys

Answer 5

special mixtures of metal

• bronze
• brass
• soldor

Question 6

physical properties

Answer 6

used to describe a substance (the substance doesn’t change)

-physical change-usually a change of state or shape, can be reversed usually(no change to the particles.)

Question 7

qualitive

Answer 7

(with out numbers)
luster-shiny/dull
optical clarity-sllow light tjrough
brittleness-breakability/flexability
viscosity-ability to slow
hardness-abilty to scratch
malleability-ability to be hammered
ducility-ability to be pulled into wire
elctrical conductivity-abilty to conduct electrity

Question 8

quantitive

Answer 8

freezing,meltind and boiling points.

• involves changes of state
• can be looked up in tables

Question 9

Density

Answer 9

a measure of how much mass is contained within a given volume
-units are usually g/mL or g/cm3

Question 10

charcteristic physical properties

Answer 10

unique to a substance and can be used to identify it.
melting ad boiling points are a good examply
another is density, most substances have unique densitys.

Question 11

water

Answer 11

water has many unusual properties

• solid water is less dense than liquid water, so ice floats.
• when salt is added to water, it lowers its freezing point.

Question 12

chemical property

Answer 12

describes how a substance can change into a new substance(change its particles)
examples-flammabiluty(fire), reactivity with acid, ability to corrode(break down i.e rust etc.), explosive.

Question 13

chemical change

Answer 13

a change in the starting materials and the production of one or more new substances
-cannot be esily reversed
evidence of chemical change
-change of colour
-change of odour
-bubble of gas
-a new solid is produced
-heat or light is given off.