Atomic Structure/ Periodic Table Flashcards Preview

Chemistry Paper 1 > Atomic Structure/ Periodic Table > Flashcards

Flashcards in Atomic Structure/ Periodic Table Deck (14)
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1
Q

Where is the nucleus in an atom?

A

It is in the middle of the atom

Contains protons and neutrons

2
Q

What is the charge of a nucleus?

A

Positive because of the protons

3
Q

Why is the overall charge of an atom 0?

A

Because they have the same number of protons as electrons, the charges cancel each other out

4
Q

What are the relative masses of protons, neutrons and electrons?

A

Proton 1
Neutron 1
Electron (very small) negligible

5
Q

What does the atomic number show us?

A

How many protons there are

6
Q

What does the mass number show us?

A

The total number of protons and neutrons in the atom

7
Q

What is an element?

A

A substance made up of atoms that all have the same number of protons in their nucleus

8
Q

What is an isotope?

A

Different forms of the same element, which have the same number of protons but a different number of neutrons

9
Q

What is a common pair of isotopes?

A

Carbon-12 and carbon-13

10
Q

How do you calculate the relative atomic mass? (Ar)

A

=sum of (isotopes abundance X mass number) / sum of abundances of all isotopes

11
Q

What is a compound?

A

Substances formed from two or more elements, the atoms are held together by chemical bonds

12
Q

What is a mixture?

A

Two or more elements or compounds mixed together (no chemical bonds)

13
Q

How can mixtures be separated?

A
  • filtration
  • crystallisation
  • simple distillation
  • chromatography
  • fractional distillation
14
Q

What are examples of mixtures?

A
  • air (oxygen, co2, nitrogen and argon)

- crude oil (mixture of hydrocarbons)