structure and properties of material

Question 1

what are elements

Answer 1

lpure substance that cannot be broken down into any simpler substances by chemical methods

Question 2

what are molecules of elements

Answer 2

2 or more atoms together

Question 3

what are monatomic molecules

Answer 3

1 atom in an element

Question 4

what are diatomic molecules

Answer 4

2 atoms in an element

Question 5

what are triatomic molecules

Answer 5

3 atoms in a element

Question 6

what are polyatomic molecules

Answer 6

4 or more atoms in an element

Question 7

what are compounds

Answer 7

pure substance made up of 2 or more elements that are chemically joined together

Question 8

features of compounds

Answer 8

• chemical reaction needs to take place when compounds are formed
• chemically combined in a fixed ratio
• cannot be separated by physical means
• have different properties from the element they are made up of

Question 9

what are mixtures

Answer 9

consists of 2 or more substances (elements and/or compounds) which are not chemically joined together

Question 10

features of mixtures

Answer 10

• can be easily spearated into its components using physical methods
• has properties of the substances that it is made up of
• substances can be mixed in any proportion

Question 11

what are chemical methods that can separate pure substance(compounds)

Answer 11

1. thermal decomposition
2. electrolysis

Question 12

what are alloys

Answer 12

mixture consisting of at least 1 metal

Question 13

examples of alloys

Answer 13

• bronze
• steel
• brass