1. True or false- occasionally an asteroid will break into fragments due to a co
ID: 926710 • Letter: 1
Question
1. True or false- occasionally an asteroid will break into fragments due to a collision. These fragments, which often contain ice, can leave the asteroid belt and even make their way to Earth. Upon entering the earth’s atmosphere, such a fragment is heated to high temperature by frictional forces. Ice contained within a fragment typically liquefies or vaporizes. This type of change is considered chemical change.
2. The following equation is not balanced: A+R2 -> A2R3. After balancing, this chemical equation is__ a. A4+R3->A4R6 b. A2+R3->A2R3 c. 4A+3R2->2A2R3 d. 2A+R2->A2R3
3. True or False-Burning gasoline is an example of physical change
4. During a chemical reaction, atoms in the reactants rearrange their chemical bonds to make products. The new arrangement of bonds does not have the same total energy as the bonds in reactants. Therefore when chemical reactants occur, ___
a. Energy is always absorbed
b. Energy is always releases
c. There will never be an accompanying energy
d. There will always be an accompanying energy
5. Which of the following does not affect rate of reaction
a. Temperature
b. Surface area
c. Molar mass
d. catalyst
Explanation / Answer
1. False : Transformation of ice to liquid or vapor is a physical change
2. After balancing the chemical equation would be :
c. 4A + 3R2 ---> 2A2R3
3. False : Burning gasoline changes into CO2 and H2O, thus it is a chemical change.
4. During chemical reaction, atoms of reactants rearrange to form products. Both having different energies. Therefore, when chemical reaction occur,
d. There will always be accompanying energy
5. The one which does not affect rate of reaction is,
c. molar mass
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