Compounds Formulae and Equations

Question 1

What is the law of conservation of mass?

Answer 1

For any system closed to all transfers of matter and energy the mass of the system must remain constant over time

Question 2

What is included in an ionic eqution?

Answer 2

Only the species/particles that are directly involved in the reaction

Question 3

What do we call ions that don’t change?

Answer 3

Spectator ions

Question 4

What do we call ions that don’t change?

Answer 4

Spectator ions

Question 5

Which compounds are soluble in water?

Answer 5

All group 1 compounds
All nitrate compounds
All ammonium compounds

Question 6

Which compounds are insoluble in water?

Answer 6

Ag+, Pb2+ chlorides
Ba2+, Pb2+ sulfates
Most hydroxides
Most carbonates

Question 7

What does an acid + an alkali equal?

Answer 7

A salt + water

Question 8

How do you make the salt?

Answer 8

Replace the hydrogen in the acid with the metal in the alkali
E.g- HCl (aq) + NaOH(l) - NaCl(aq) + H2O(l)

Question 9

Water is a - molecule so does not contain -

Answer 9

covalent
ions

Question 10

What do you need to do with an ionic equation before dismantling it?

Answer 10

Make sure it is balanced

Question 11

An acid + a carbonate -

Answer 11

a salt
water
CO2

Question 12

What is a precipitate?

Answer 12

An insoluble solid

Question 13

In ionic equations precipitates

Answer 13

Are not broken up (leave them alone)

Question 14

What do we call ions that remain the same for the duration of the reaction?

Answer 14

Spectator ions

Question 15

It’s important to make sure the charges on both sides..

Answer 15

Balance out

Question 16

What do you do with any solid precipitate in an ionic equation?

Answer 16

Leave it alone
Does not separate into ions