Chemical reactions!?

Question

1. The new substances produced in a chemical reaction have________.
a. the same properties as the original substances.
b. different physical properties from the original substances.
c. different chemical properties from the original substances.
d. different physical and chemical properties from the original substances.

2. which reaction requires a continuous supply of energy?
a. an exothermic reaction
b. an endothermic reaction
c. a synthesis reaction
d. a decomposition reaction

3. when reactant paticles collide more ofter,
a. the reaction rate remains the same.
b. the reaction rate decreases.
c. the reaction rate increases.
d. None of the above.

4. Which of the following is an example of an exothermic reaction?
a. light energy is released in light sticks.
b. electrical energy is released in the dry cells of a flashlight.
c. light and thermal energy are released in a campfire.
d. all of the above.

Answer 1

1 is (d)
2 is (b)
3 is (c)
4 is (d)