A. Write , if the statement is true and X if it is false.
1. When a physical change occurs there is no breaking and forming of bonds. 2. A chemical equation distinguishes between the reactants, which are the starting materials and the products which are the resulting substances.
3. An acid-base reaction is a special kind of double displacement reaction that takes place when an acid and base react with each other.
4. In balancing equation, you can change the subscripts of a formula.
5. In collision theory, all collisions between molecules result in the formation of products.
6. Materials that are mostly made up of limestone and marble cannot be destroyed by acid rain.
7. The presence of catalyst speeds up the rate of reaction.
8. Acid rain has been the leading significant cause of destruction in our environment.
9. Production of light, evolution of gas, temperature change, color change, and formation of precipitate are the factors affecting the rate of chemical reaction.
10. CFCs (chlorofluorocarbons) and nitrogen oxides does not affect the ozone layer. ​