Chemistery 3

Question 1

What are the 7 physical properties of metals?

Answer 1

High density
good conductors of electricity
ductile and malleable
high melting and boiling pollution
strong and tough
good heat conductors 
solid state at room temperature(except mercury)

Question 2

What are the 7 non-metal physical properties?

Answer 2

low melting point 
dull
brittle
low density
do not conduct electricity
do not conduct heat

Question 3

Why are alloy wheels made from aluminium?

Answer 3

because they can resist weight.

Question 4

why is jewellery made out of gold?

Answer 4

because it is strong and tough.

Question 5

why are water pipes made out of copper?

Answer 5

because copper does not rust is malleable and is cheaper.

Question 6

What does MASH stand for?

Answer 6

M metals
Acid
(arrow)
Salt 
hydrogen

Question 7

What s is the equation linking to metals reacting with acids?

Answer 7

Meatls+ acid ——-> salt+hydrogen

Question 8

how will you write hydrochoric acid when it has reacted with a metal?

Answer 8

chloride

Question 9

how will you write sulphuric acid when it has reacted with a metal?

Answer 9

sulphate

Question 10

how will you write nitric acid when it has reacted with a metal?

Answer 10

nitrate

Question 11

what is the formula for hydrochloric acid?

Answer 11

HCl

Question 12

what is the formula for sulfuric acid?

Answer 12

H( small 2 down)SO(small 4 down)

Question 13

what is the formula for nitric acid?

Answer 13

HNO(small 3 down)

Question 14

What is a chemical reaction?

Answer 14

a chemical reaction is when one or more new chemical substances are made from the starting material.

Question 15

What are the starting substances in a chemical reaction called?

Answer 15

reactants

Question 16

what are things called that is the outcome of the reaction?

Answer 16

products

Question 17

What are the 6 things that tell us that a chemical reaction has taken place?

Answer 17

colour change
gas coming off( you see fizzing or bubbling in the reaction)
a change in temperature
a solid may be formed when 2 liquids are mixed
some also make noise
some even make electricity

Question 18

Name the three things about hydrogen

Answer 18

is colourless, odourless
less dense than air
forms an explosive mixture with air

Question 19

How can we test for hydrogen?

Answer 19

place a burning splint next to a test tube and a ‘squeaky pop’ as the gas indicates show that hydrogen is produced in this reaction

Question 20

what do we call a thing that is made up of one type of atom?

Answer 20

If the solid, liquid or gas is made up of only one type of atom than we call it an element.

Question 21

What are the three ways you can speed up a reaction?

Answer 21

Increased surface area
increased concentration
increase temperature