Atoms and atomic structure

Question 1

What is a compound?

Answer 1

Contain 2 or more different elements chemically joined in fixed proportions

Question 2

What is a mixture?

Answer 2

There is 2 different elements or compounds but not chemically combined

Question 3

How would you separate a compound?

Answer 3

using a chemical reaction

Question 4

How would you separate a mixture?

Answer 4

using physical separation eg filtration, distillation, crystallisation or chromatography

Question 5

What are atoms made up of?

Answer 5

Protons neutrons and electrons

Question 6

How are protons, neutrons and electrons charged?

Answer 6

Protons - positively (1)
electrons - negatively (-1)
neutrons - no charge (0)

Question 7

What charge does the nucleus have?

Answer 7

Overall positive charge

Question 8

Which number is the mass number and which number is the atomic number?

Answer 8

Mass number is the top number
Atomic number is the bottoms number

Question 9

How do we calculate the protons, electrons and nuetrons?

Answer 9

protons (and electrons) is the bottom number (atomic number)
nuetrons is the top number (mass) takeaway the bottom number (atomic)

Question 10

What is an isotope?

Answer 10

atoms with the same number of protons but different number of neutrons

Question 11

What is an Ion?

Answer 11

atoms which have an overall charge beacuse they have lost or gained electrons

Question 12

How do we tell if an ion has lost or gained electrons?

Answer 12

Positive ions have lost electrons
Negative ions have gained electrons

Question 13

What does abundance mean?

Answer 13

how common each isotope is

Question 14

Formula for relative atomic mass

Answer 14

sum of isotope abundance X isotope mass number / 100