3.1 Introduction GCSE

Question 1

what is the difference between a chemical reaction and a physical reaction.

Answer 1

Chemical reactions are irreversible and a new substance is produced. Physical reactions are reversible and a new substance isn’t produced.

Question 2

Give ways you can tell if a chemical reaction has occurred.

Answer 2

Colour change, Temperature change, Bubbling (gas given off), Sound / smell produced.

Question 3

name all the diatomic elements

Answer 3

hydrogen
nitrogen
oxygen
fluorine
chlorine
iodine
bromine
astatine

Question 4

name all 5 general qualities of metals

Answer 4

shiny
grey
solid at room temp
conducts electricity
malleable

Question 5

define compound

Answer 5

a substance containing more than one element chemically bonded together

Question 6

name the 4 states of matter

Answer 6

solid
liquid
gas
aqueous

Question 7

NH3 + HCL ->

Answer 7

NH4CL

Question 8

what is the solute

Answer 8

the substance to be dissolved

Question 9

what is the solvent

Answer 9

the liquid in which the solute is dissolved

Question 10

what is soluble

Answer 10

a substance that can be dissolved

Question 11

what is saturated

Answer 11

a solution that can not dissolve any more solute