Grade 9 Chemistry Review

An electron is:

• Positively charged

• Negatively charged

• Neutral

The atomic number of an element tells us:

• The number of protons

• The number of neutrons

• The number of protons plus neutrons

• The atomic mass

An ice cube melting is an example of a:

• Physical change

• Chemical change

Tags

NGSS.MS-PS1-4

Beryllium's atomic number is 4 and its atomic mass is 9. How many neutrons will a beryllium atom have?

• 4

• 5

• 9

• 13

Tags

NGSS.MS-PS1-1

Which of these is NOT a physical property?

• Colour

• Melting Point

• Hardness

• Flammability

In a Bohr-Rutherford Diagram, the innermost shell has a maximum of how many electrons?

• 1

• 2

• 8

• 18

Soda with ice cubes is an example of a:

• Homogeneous mixture

• Heterogeneous mixture

• Element

• Compound

Calcium's atomic number is 20. A calcium ion has a charge of +2. How many electrons does a calcium ion have?

• 18

• 20

• 22

• 40

Tags

NGSS.MS-PS1-1

Where would you tend to find non-metals on the periodic table?

• In the left-most groups

• In the middle of the table

• In the right-most groups

• At the bottom of the table

A rotting apple is an example of a:

• Physical change

• Chemical change

Tags

NGSS.MS-PS1-2