Unit 3 Review

If 10 grams of zinc metal react with 25 grams of bromine, what will be the mass of the final product?

• 10 grams

• 35 grams

• 25 grams

• 15 grams

Water has a low melting and boiling point, this means that water is more likely

• A covalent compound

• An ionic compound

• A metallic compound

• Wet

Select all the examples of ionic compounds

• NaCl

• MgO

• KBr

Select all the examples of covalent compounds

• MgO

• HCN

Which equation shows conservation of mass?

Ionic bonds involve

• Attraction between water and salts

• Electrostatic interactions between anions and cations

• The release of protons by negatively charged particles

• The sharing of electrons between two atoms of the same element

What type of bond is formed when two atoms share a pair of electrons?

• Ionic

• Metallic

• Covalent

• Symbiotic

When a chemical reaction occurs in a sealed container, what is the total mass after the reaction compared to the total mass before the reaction?

• Less

• More

• Variable

• The same

Unknown element W has 2 valence electrons. Unknown element X has 7 valence electrons. Which formula shows the most likely outcome when elements W and X react?

Based on the model shown, what is the formula for a compound containing only Li and O?