Year 8 Chem Revision

Question 1

A full [electron] shell is

Accepted Answer

a happy shell

Question 2

Which is a property of non-metals?

Accepted Answer

Dull appearance

Question 3

A cation is...

Accepted Answer

When the number of electrons decreases

Question 4

True or false: Chemical reactions create or destroy mass.

Accepted Answer

False

Question 5

What is a characteristic of metals?

Accepted Answer

Conduct heat and electricity

Question 6

What does the periodic table show?

Accepted Answer

Elements and their properties

Question 7

What does a chemical formula represent?

Accepted Answer

Type and number of atoms

Question 8

What indicates a chemical change?

Accepted Answer

Color change

Question 9

The valence electron shell

Accepted Answer

Is the shell furthest from the nucleus that has electrons

Question 10

What is the atomic number?

Accepted Answer

Number of protons

Question 11

What is the charge on a neutron?

Accepted Answer

Neutral

Question 12

What are the three subatomic particles?

Accepted Answer

Protons, neutrons, electrons

Question 13

True or false: The periodic table organizes elements by their properties.

Accepted Answer

True

Question 14

Which particle has a positive charge?

Accepted Answer

Proton

Question 15

True or false: Elements can be represented by chemical formulas.

Accepted Answer

False

Question 16

What is a cation?

Accepted Answer

Positively charged ion

Question 17

Which particle is negatively charged?

Accepted Answer

Electron

Question 18

Fluorine forms which of the following ions?

Accepted Answer

F-

Question 19

To become a positive ion, an atom must ___________ .

Accepted Answer

lose electrons

Question 20

What is the purpose of a word equation?

Accepted Answer

To show reactants and products

Question 21

What is the mass number?

Accepted Answer

Protons plus neutrons

Question 22

What are Electron Shells ?

Accepted Answer

Circular orbits that electrons follow around atomic nuclei

Question 23

True or false: Ions are formed when atoms gain or lose electrons.

Accepted Answer

True

Question 24

How many electrons can the second electron shell hold?

Accepted Answer

8

Question 25

The 1st electron shell holds a maximum of ____ electrons

Accepted Answer

2

Question 26

Which of these is a non-metal?

Accepted Answer

Sulfur

Question 27

True or false: Chemical properties describe how substances react.

Accepted Answer

True

Question 28

In carbon, the number of electron shells is?

Accepted Answer

2

Question 29

Which element is a metal?

Accepted Answer

Iron

Question 30

What is a characteristic of metals?

Accepted Answer

Conduct electricity

Question 31

What is a mixture?

Accepted Answer

Two or more substances

Question 32

What is the charge of a cation?

Accepted Answer

Positive

Question 33

What does the periodic table represent?

Accepted Answer

All known elements

Question 34

True or false: Chemical reactions can occur at different rates.

Accepted Answer

True

Question 35

True or false: Atoms are the smallest units of matter.

Accepted Answer

True

Question 36

How do ionic compounds form?

Accepted Answer

By transferring electrons

Question 37

To become a negative ion, an atom must ____________.

Accepted Answer

gain electrons

Question 38

What is a chemical reaction?

Accepted Answer

Rearranging atoms

Question 39

What type of elements form anions?

Accepted Answer

Nonmetals

Question 40

What is an anion?

Accepted Answer

a negatively charged atom

Question 41

True or false: Chemical bonds join atoms to form molecules.

Accepted Answer

True

Question 42

Identify which list contains only properties of metals.

Accepted Answer

ductile, malleable, conduct electricity

Question 43

Which of these is a pure substance?

Accepted Answer

Gold

Question 44

True or false: All matter is made of atoms.

Accepted Answer

True

Question 45

What is a compound?

Accepted Answer

Two or more elements

Question 46

What distinguishes elements from compounds?

Accepted Answer

Elements are pure substances

Question 47

What is a reactant?

Accepted Answer

Starting substances

Year 8 Chem Revision

Questions 47

Year 8 Chem Revision

Questions 47