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Flashcards in Science 4 Deck (22)
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0
Q

Example of element

A

Zinc, oxygen, carbon

1
Q

Element

A

A substance made up of only 1 type of atom

2
Q

Compound

A

2 or more elements chemically combined

3
Q

Compound example

A

Sodium chloride, hydrogen sulfide

4
Q

Mixtures

A

2 or more different substances that are NOT chemically combined

5
Q

Mixture example

A

Salt water, air

6
Q

Atom

A

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

7
Q

Nucleus

A

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

8
Q

Electron

A

Negative particles surrounding the nucleus

9
Q

Protons

A

Positive particles found in the nucleus

10
Q

Neutrons

A

Neutral particles found in the nucleus

11
Q

Sub Atomic Particles

A

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

12
Q

Atomic Number

A

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

13
Q

Mass number

A

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

14
Q

Isotope

A

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

Can be radioactive

15
Q

Shells

A

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

16
Q

Valence Electrons

A

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

17
Q

Reactants

A

The different substances added together to create a chemical reaction

18
Q

Products

A

Compounds formed after a chemical reaction has taken place

19
Q

Law of conservation

A

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

20
Q

Law of Constant Proportions

A

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

21
Q

Enthalpy

A

Stored energy in the bonds that hold atoms together