Class Test 1

Question 1

Chemistry

Answer 1

is the study of properties and behavior of matter

Question 2

matter

Answer 2

is the physical material of the universe, and is to do with anything that has mass and occupies space

Question 3

SI units

Answer 3

of mass are in grams
volume is in cubic meters Eg: 1000m = 1.1x10^3
all measurements in chemistry can be shortened in matter of standard form

Question 4

matter is classified on?

Answer 4

physical state, and its composition

Question 5

gas

Answer 5

• has no fixed volume
• can be compressed or expanded
• molecules are fall apart and move at high speeds colliding with one another within the walls of the container

Question 6

liquid

Answer 6

• has distinct volume
• assumes shape of container
• molecules are packed closely but can still move rapidly - this movement allows the molecules to flow out easily

Question 7

solid

Answer 7

• definite shape and volume
• molecules held tightly in arrangement
• stay in fixed positions

Question 8

mixture

Answer 8

is a combination of two or more substances in which each substances remain its chemical identity (properties)

Question 9

properties of matter

Answer 9

can be categized as physical or chemical. the physical properties can be observed without changing the identity or composition of the substance
-chemical properties describe the way a substance may change or react to form out substances

Question 10

extensive properties

Answer 10

do not depend on the amount of the sample being examined, eg; mass

Question 11

intensive properties

Answer 11

depend on amount of sample being examined

Question 12

chemical change

Answer 12

also called a chemical reaction is when a substance is transformed into a chemically different substance

Question 13

heating curve substances

Answer 13

solid to gas (sublimation)

gas to solid (deposition)

Question 14

diffusion

Answer 14

a substances movement of particles from a region of high concentration to a lower concentration
increase volume - decreased pressure
increased volume - increased pressure

Question 15

separation techniques

Answer 15

• filtration
• separation funnel
• distillation
• functional distillation
• chromogarphy

Question 16

separation techniques

Answer 16

• filtration (insoluble substance in a solvent)
• separation funnel(2 insoluble substances)
• distillation (2 soluble substances)
• functional distillation(two soluble solvents)
• chromography (pens)

Question 17

atom

Answer 17

elements are composed of extremely small particles called atoms, a given element have all identical atoms - same size, mass and chemical properties

• can be identified by No of protons and neutrons they have

Question 18

heterogenous

Answer 18

some mixtures don’t have the same compositions, properties and appearances throughout

Question 19

homogeneous

Answer 19

these mixtures are uniformed throughout

Question 20

rate of diffusion

Answer 20

inversely proportional to the molecular mass

heavy particles move slower than lighter ones

Question 21

transition from solid to liquid and then to gas