1. When water boils, water vapor is produced and escapes into the air. What best describes this change? 2. When iron combines with oxygen in a moist environment, rust forms because of a
~ chemical reaction
~ change in temperature
~ physical change
3. Two clear liquids are poured together in a flask. They begin to smoke, change color and the flask begins to feel warm to the touch. What type of change occurred?
~chemical and endothermic
~chemical and exothermic
~physical and exothermic
4. Can a phase change (change of state) produce new compounds?
~No, because physical changes occur
~Yes, because atoms can bond together to form new substances
~No, because chemical changes occur
5. Which is true of any physical or chemical reaction?
~Mass decreases
~Mass increases
~Mass is conserved