Science 4

Question 0

Example of element

Answer 0

Zinc, oxygen, carbon

Question 1

Element

Answer 1

A substance made up of only 1 type of atom

Question 2

Compound

Answer 2

2 or more elements chemically combined

Question 3

Compound example

Answer 3

Sodium chloride, hydrogen sulfide

Question 4

Mixtures

Answer 4

2 or more different substances that are NOT chemically combined

Question 5

Mixture example

Answer 5

Salt water, air

Question 6

Atom

Answer 6

The smallest particle of a substance that can exist and still be that substance

Question 7

Nucleus

Answer 7

Found in the centre of atoms, it contains protons and neutrons

Question 8

Electron

Answer 8

Negative particles surrounding the nucleus

Question 9

Protons

Answer 9

Positive particles found in the nucleus

Question 10

Neutrons

Answer 10

Neutral particles found in the nucleus

Question 11

Sub Atomic Particles

Answer 11

A particle less complex than an atom. Protons electrons and neutrons are all a subatomic particles

Question 12

Atomic Number

Answer 12

The atomic number is equal to the number of protons in an atom

Question 13

Mass number

Answer 13

The mass number is equal to the number of protons added onto the number of neutrons in an atom

Question 14

Isotope

Answer 14

An atom that has the same number of protons but a different number of neutrons. Same atomic number different mass number.

Can be radioactive

Question 15

Shells

Answer 15

Regions around the nucleus where where electrons travel around the nucleus at high speed

Question 16

Valence Electrons

Answer 16

an electron in the outer shell of an atom which can combine with other atoms to form molecules

Question 17

Reactants

Answer 17

The different substances added together to create a chemical reaction

Question 18

Products

Answer 18

Compounds formed after a chemical reaction has taken place

Question 19

Law of conservation

Answer 19

The law that states that the mass of the reactants equals the mass of the products

Question 20

Law of Constant Proportions

Answer 20

The law states that no matter what happens certain elements will always bind with other specific elements
E.g. 2 atoms of Oxygen will always bind with 1 atom of carbon to form CO2

Question 21

Enthalpy

Answer 21

Stored energy in the bonds that hold atoms together