Atoms, Elements compounds and mixtures

Question 1

What is a Atom?

Answer 1

An Atom is the smallest part of an element that can exist.

Question 2

What is a Element?

Answer 2

An element is a substance that contains only one sort of atom. There are about 100 different elements.

Question 3

How are Elements displayed?

Answer 3

They are displayed in the periodic table.

Question 4

What is a compound?

Answer 4

A compound contains atoms of two or more elements, which are chemically combined in fixed proportion.

Question 5

How is a compound represented?

Answer 5

Represented by a combination of Numbers and chemical symbols called a ‘chemical formula’.

Question 6

What is a word equation or balanced symbol equation?

Answer 6

They can sum up what has happened during a chemical reaction.

Question 7

How is a equation laid out?

Answer 7

• The reactants ( substances that react) are on the left-hand side.
• The products( the new substances that are formed) are on the right- hand side of the equation.

Question 8

Mixtures

Answer 8

It consist of two or more elements or compounds, which are not chemically combined.

Question 9

Crystallisation

Answer 9

Used to obtain a soluble solid from a solution.
1. Heat up the mixture
2. The water evaporates leaving crystals of pure salt/ soluble solid.

Question 10

Required practice: Simple distillation

Answer 10

1. Set up equipment
2. Set heat - 100*c
3. Water collects in the condenser and changes state from liquid to gas, collects this pure water in beaker.
4. When all water evaporated, measure mass of solid that remains to find amount of dissolved solids present in sample.

Question 11

Chromatography

Answer 11

Used to separate the different soluble, colored components of a mixture.