4. The following chemical equation is not balanced:

4. The following chemical equation is not balanced: A + R2 toA2R3.
After balancing, this chemical equation is _________.
1. 4A +3R2 -> 2A2R3
2. 2A + R2 ->A2R3
3. A4 + R6 -> A4R6
4.A2 + R3 ->A2R3
5. Burning gasoline is an example of a physical change? T or F
6.During a chemical reaction, atoms in the reactant rearrange their chemical bonds to make products. The new arrangement of bonds does not have total energy as the bonds in the reactants .Therefore, when chemical reactions occur,_______ ?
A.Energy is always absorbed
B. There will always be an accompanying energy change.
C.Energy is always released .
D.There will never be an accompanying energy change. Any change would violate the law of energy conversation.

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