Atoms, elements and compounds COPY

Question 1

What is the relative charge of a proton?

Answer 1

+1

Question 2

What is the relative charge of a neutron?

Answer 2

no charge

Question 3

What is the relative charge of an electron?

Answer 3

-1

Question 4

What is the relative mass of a proton?

Answer 4

1

Question 5

What is the relative mass of a neutron?

Answer 5

1

Question 6

What is the relative mass of an electron?

Answer 6

0.00054 (1/2000)

Question 7

What is a proton number?

Answer 7

number of protons in the nucleus of an atom

Question 8

What is a nucleon (mass) number?

Answer 8

total number of protons and neutrons in the nucleus of an atom

Question 9

What are isotopes?

Answer 9

atoms of the same element which have the same proton number but a different nucleon number

Question 10

Why do isotopes have the same properties?

Answer 10

they have the same number of electrons in their outer shell

Question 11

What are the two types of isotopes?

Answer 11

radioactive

non radioactive

Question 12

What is a medical use of radioisotopes?

Answer 12

Sterilizing equipment

Cancer treatment

Question 13

What is an industrial use of radioisotopes?

Answer 13

Checking for oil leaks in pipelines

Question 14

What is an element?

Answer 14

A substance made of one type of atom

Question 15

What is a mixture?

Answer 15

substance contains two or more elements or compounds that are not chemically bonded together

Question 16

What is a compound?

Answer 16

substance made up of two or more different types of atoms joined together by chemical bonds

Question 17

What is an alloy?

Answer 17

a mixture of a metal with other elements

Question 18

How are ions formed?

Answer 18

Electron loss/gain

Question 19

What is an ionic bond?

Answer 19

Attraction between positive ions and negative ions

Question 20

What is an ion?

Answer 20

Electrically charged particle

Question 21

What is an ionic bond between?

Answer 21

Metals + non-metals

Question 22

How are ionic bonds formed?

Answer 22

Ions transfer electrons from one atom to another

Question 23

An ionic lattice has + & - ions and is held together by

Answer 23

strong electrostatic bonds

Question 24

What are 4 properties of ionic compounds?

Answer 24

High fixed points
Poor conductors as solid
Hard
Soluble​ in water

Question 25

Why do ionic compounds have high fixed points?

Answer 25

(ionic bonds strong​)

◆ Lots of energy required to overcome electrostatic attraction

Question 26

Why are ionic compounds poor conductors as solids?

Answer 26

no moving/free electrons

Question 27

Why are ionic compounds good conductors as liquids?

Answer 27

Conducts electricity as liquid (charged ions​ free​ to move)

Question 28

When is a covalent bond formed?

Answer 28

when atoms share a pair of electrons

Question 29

What is an covalent bond between?

Answer 29

Non-metals + Non-metals

Question 30

What are molecules?

Answer 30

a group of atoms held together by COVALENT​ bonds

Question 31

What are 3 properties of covalent compounds?

Answer 31

Low fixed points
Do not conduct electricity
Insoluble in water, but dissolve in organic solvents

Question 32

Why don’t covalent compounds conduct electricity?

Answer 32

atoms not charged

Question 33

Why do covalent compounds have low fixed points?

Answer 33

the weak intermolecular attractive forces