Chemistry C1 - Atomic structure

Question 1

Define an atom?

Answer 1

The smallest part of an element identifiable

Question 2

Approximately how many elements are there?

Answer 2

100

Question 3

How are compounds formed?

Answer 3

from elements by chemical reactions

Question 4

How can you separate compounds?

Answer 4

by further chemical reactions

Question 5

Define a compound.

Answer 5

atoms of different elements chemically combined

Question 6

What is a mixture?

Answer 6

two or more substances that are not chemically joined together but are mixed together

Question 7

How would you separate a solid and a liquid?

Answer 7

filtration

Question 8

How would you recover salt from a solution?

Answer 8

crystallisation

Question 9

Describe the original model of the atom.

Answer 9

solid, invisible spheres

Question 10

Which experiment led to the nuclear model of the atom?

Answer 10

the alpha scattering experiment

Question 11

Outline the nuclear model of the atom.

Answer 11

atoms consist of small positive charged nucleus orbited by electrons. most of an atom is empty space

Question 12

Which particle did James Chadwick discover?

Answer 12

the nucleus

Question 13

Name the positive subatomic particle

Answer 13

proton

Question 14

Name the neutral subatomic particle.

Answer 14

neutron

Question 15

Name the negative subatomic particle.

Answer 15

electron

Question 16

What are the number of electrons in the first 4 shells?

Answer 16

2, 8, 8, 2

Question 17

What does atomic number tell you?

Answer 17

number of protons in the nucleus

Question 18

What does mass number tell you?

Answer 18

total number of protons and neutrons in an atom