Elements, Mixtures and Compunds

Question 1

Single atoms:

Answer 1

Atoms that do not join up with other atoms.

Question 2

Molecules of an element:

Answer 2

When atoms of the same element join together to get a molecule from that element

Question 3

Compunds:

Answer 3

A compound is made when different atoms join together by chemical bonds.

Question 4

Mixture:

Answer 4

A mixture is made from a substance that are not chemically joined.

Question 5

Define the periodic table:

Answer 5

A chart of elements.
The rows are called period.
The colomns are called groups.

Question 6

Molecules:

Answer 6

2 or more atoms connected by chemical bonds.

Question 7

What type of bond does a molecule have?

Answer 7

Ionic

Question 8

What type of bond does a compund have?

Answer 8

Metallic or ionic

Question 9

Examples of molecules:

Answer 9

Hydrogen
Chlorine
Nitrogen

Question 10

Examples of compund:

Answer 10

Carbon dioxide
Water
Sodium chloride

Question 11

What is a chemical change?

Answer 11

A chemical change is irreversible.

Question 12

What is a physical change?

Answer 12

It is a temporary change.

Question 13

What is the chemical change for sodium hydroxide?

Answer 13

NaOH

Question 14

What is the chemical change for sodium chloride?

Answer 14

NaCl

Question 15

What is the chemical change for nitrogen?

Answer 15

N2

Question 16

What is the chemical change for oxygen?

Answer 16

O2

Question 17

What is the chemical change for chlorine?

Answer 17

Cl2

Question 18

What is the chemical change for hydrogen chloride?

Answer 18

HCl

Question 19

Iron + oxygen = ?

Answer 19

Iron oxide

Question 20

Magnessium + chlorine = ?

Answer 20

Magnessium chloride

Question 21

Purity:

Answer 21

Purity is a way to describe how much of specific element is in a mixture.

Question 22

Alloy:

Answer 22

Alloy is a mixture of elements of which at least one is a metal.

Question 23

Concentration:

Answer 23

The proportion of solute to solvent.

Question 24

What is diffusion?

Answer 24

It is the mixing of particles within a liquid or gas until it has become evenly spread out.

Question 25

Why does diffusion occur?

Answer 25

It occurs due to random movement.

Question 26

Where does diffusion occur?

Answer 26

Diffusion does not happen in solids but it happens in liquids and gases.

Question 27

Examples of diffusion?

Answer 27

Deoderant
Perfume