Yr 9 Chem Revision

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons are in its nucleus?

• 24
• 16
• 8
• 12

The pH scale ranges from ____________.

• 0-7
• 1-100
• 1-20
• 0-14

According to the pH range which substance is more acidic than lemon juice

• Hydrochloric acid
• cabbage
• milk

Tags

NGSS.MS-PS1-2

When you combine an acid with a base it produces ___.

• a huge explosion
• a very dangerous gas
• a salt and water

Tags

NGSS.MS-PS1-2

Is making salt water to gargle with a physical or chemical change?

• physical
• chemical

An gel ice pack getting cold after you put it in the freezer for an hour.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Baking a cake by mixing flour, sugar, chocolate powder, eggs, and milk, and then heating them in the oven.

• Chemical Change
• Physical Change

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the equation,          2Mg + O₂ ---> 2MgO, which are the reactants?

• Mg and O
• MgO
• Mg and MgO
• O and MgO

Tags

NGSS.MS-PS1-2

Exothermic reactions...

• Absorb energy
• Release energy
• Release Color
• Absorb Color

Tags

NGSS.MS-PS3-5

Is a a rusting bicycle a chemical or physical change?

• chemcial
• physical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5