Topic 1a: Atoms Elements Compounds And Mixtures

Question 1

What do atoms contain

Answer 1

Protons
Neutrons
Electrons

Question 2

The number of protons equals

Answer 2

The number of electrons

Question 3

Are atoms positive negative or neutral. Why?

Answer 3

They are neutral cause they have the same number of protons and elctrons

Question 4

In the periodic table what does the top number show.

Answer 4

It is the mass number and shows the amount of protons and neutrons in an atom

Question 5

How do you work out the amount of neutrons using the nuclear symbol?

Answer 5

Subtract atomic number from mass number

Question 6

What is an element

Answer 6

An element is a substance made up of atoms which all have the same number of protons in their nucleus

Question 7

What are isotopes?

Answer 7

Different forms of the same element which have the same number of protons but different number of neutrons

Question 8

How to work out the reletive atomic mass of a substance:

Answer 8

Sum of (isotope abundance × isotope mass number) ÷ sume of abundance of all isotopes

Question 9

When are compounds formed?

Answer 9

When elements react

Question 10

What are mixtures?

Answer 10

To or more element or compounds mixed together with no chemical bonds

Question 11

What method shoukd you use to separate compounds from a mixture?

Answer 11

Chromatography

Question 12

What methods should you use to separate insoluble solids from liquids?

Answer 12

Filtration

Question 13

2 ways to separate soluble solids from solutions

Answer 13

Evaporation
Crystallisation

Question 14

What method can be used to separate out a liquid from a solution?

Answer 14

Simple distillation

Question 15

What method can be used to separate out mixtures of liquids?

Answer 15

Fractional distillation

Question 16

When was the plumber pudding model thought of?

Who made it?

Answer 16

1897

JJ Thompson

Question 17

What experiment by Rutherford showed the plum pudding model was wrong?

Answer 17

Alpha particle scattering experiment

Question 18

How did the alpha partical scattering experiment prove the plum pudding model wrong?

Answer 18

Some of the particles fired were deflected off the gold sheet more than expected.

Question 19

Why discovered the nuclear model and when?

Answer 19

Ernest Rutherford

Question 20

How does the group the element is in correlate to the number of electrons in its outer shell. What about the row its in?

Answer 20

Group number= amount of electrons in outer shell

Row number= amount of shells they have