Science 9 Chemistry Check-in

What is the smallest unit of an element?

• Electron

• Proton

• Nucleus

• Atom

What is the atomic number of the atom represented here?

Bromine is an element in period 4 and group 17. It is in the same family as Fluorine and Chlorine. How many valence electrons does Bromine have?

• 17

• 7

• 1-

• 4

Bromine is an element in period 4 and group 17. It is in the same family as Fluorine and Chlorine. How many electron orbitals does Bromine have?

• 17

• 7

• 1-

• 4

Bromine is an element in period 4 and group 17. It is in the same family as Fluorine and Chlorine. What charge will a bromide ion have and what type of ion will it be?

• 1+ Anion

• 1- Cation

• 1+ Cation

• 1- Anion

Distinguish between an element and a compound. Use examples to help.

Which statement is true about ionic bonds or compounds?

• Ionic bonds are formed by sharing electrons between atoms

• The anion and cation always bond in a 1:1 ratio.

• Ionic compounds have an overall negative charge due to the electrons lost by the cation.

• Ionic bonds are due to attraction between opposite charges

Identify this type of reaction.

• Synthesis

• Single Displacement

• Double Displacement

• Combustion

Identify this type of reaction.

Br₂ + 2 KI → 2 KBr + I₂

• Synthesis

• Single Displacement

• Double Displacement

• Combustion

Check all that describes an acid or is an example of an acid.

• High OH^- concentration

• Sour taste

• Feels slippery

• Vinegar

• Hydrogen oxide