C1 -Atomic Structure

Question 1

Why must equations always be balanced?

Answer 1

Because no atoms can ever be created or destroyed - total mass of product formed = total mass of reactants.

Question 2

D. Mixture?

Answer 2

2 or more substances that are not chemically combined together.

Question 3

D. Isotope?

Answer 3

Atoms of the same element with different number of neutrons.

Question 4

What Is the similarities/differences between isotopes and original elements?

Answer 4

Different physical properties - high density

Same chemical properties - because reactions depend on atomic structure.

Question 5

What determines the way an element reacts?

Answer 5

The number of electrons in the puter shell.

Question 6

Filtration?

Answer 6

Separates insoluble substances from soluble in the solvent

Question 7

Filtration technique?

Answer 7

Collect sand on filter paper and wash to remove left over salt solution
Then dry wet sand in evaporating oven

Question 8

Crystallisation?

Answer 8

Evaporate water from NaCl solution on evaporating dish on water bath
Then leave to evaporate

Question 9

Distillation?

Answer 9

Heat solution and boil to evaporate solvent
Vapour into condenser
Glass tube w/ = cooling jacket
Condensed back in liquid in receiving vessel

Question 10

Miscible?

Answer 10

Mixes completely

Question 11

Immiscible?

Answer 11

Can’t be mixed with another substance without separating from it

Question 12

Fractional Distillation?

Answer 12

heat over glass beads
higher boiling point substance condenses & drops
lower boiling point substance rises into condenser
condenses