Chemistry test review

What type of change can be easily reversed?

• chemical change

• physical change

• both chemical and physical changes

• neither physical or chemical changes

Which of the following is an example of a physical change?

• a bike rusting

• toast burning

• butter melting

• food spoiling

Which of the following is an example of a chemical change?

• a penny tarnishing

• a mirror being scratched

• hair being cut

• water being boiled

Is this an example of a physical or chemical change?

• physical

• chemical

Is a rotting banana an example of a physical or a chemical change?

• Physical Change
• Chemical Change

Valence electrons are found

• outermost energy level

• innermost energy level

• some where in the electron cloud

How do covalent bonds form?

• by sharing electrons between atoms

• by donating or receiving electrons

What two types of atoms make a covalent bond?

• 2 nonmetals

• 2 metals

• 1 metal and 1 nonmetal`

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

Which factors increase the rate of a reaction.

• increasing temperature
• increasing concentration
• increasing surface area
• all of these