Atoms And Elements

Question 1

What is an atom?

Answer 1

Atoms are building blocks of matter that are in everything from tables and chairs to humans

Question 2

What is an element?

Answer 2

A pure substance that cannot be broken down into other substances

Question 3

2 examples of elements that are metals

Answer 3

Lithium and sodium

Question 4

2 examples of elements that are non metals

Answer 4

Carbon and sulfur

Question 5

How are elements combined to form the building blocks of all substances?

Answer 5

Elements are combined with other elements to create new substances

Question 6

How are elements arranged in the periodic table?

Answer 6

Elements are arranged depending on their components

Question 7

The chemical formula for water and carbon dioxide and what they show

Answer 7

Water: H2O and it shows the number and type of atom in molecule

Carbon dioxide: CO2 “”

Question 8

The different types of reactions that cause new substances

Answer 8

Colour change, heat content change, has produced

Question 9

Describe the type and arrangement of atoms in elements and compounds and mixtures

Answer 9

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

Question 10

Describe the composition of air

Answer 10

Oxygen 21%
Nitrogen 78%
Others including argon 0.9%
C02 0.037%

Question 11

How has the composition of air changed during earths history?

Answer 11

The earths atmosphere has changed over billions of years. The earth is changing more because of human activity. For example burning fossil fuels and deforestation xx