Chemistry Se 11 B
- 1.During an endothermic reaction, heat content in the surroundings decreases because —
- A.
The reaction absorbs heat energy
- B.
All reactions need heat energy
- C.
Energy is given off by the reaction
- D.
Heat energy is destroyed during reactions
- 2.Which of the following equations correctly shows that the combustion of methane is an exothermic reaction?
- A.
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
- B.
Heat + CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
- C.
CH4(g)+2O2(g)+heat→CO2(g)+2H2O(g)
- D.
CH4(g)+2O2(g)→CO2(g)+2H2O(g)+heat
- 3.Photosynthesis, the reaction plants use to make sugar, is an endothermic reaction. Which best describes the energy of the products and reactants in the photosynthesis reaction?
- A.
Energy is absorbed during the reaction, making the energy of the products greater than the energy of the reactants.
- B.
Energy is given off during the reaction, making the energy of the products greater than the energy of the reactants.
- C.
Energy is absorbed during the reaction, making the energy of the reactants greater than the energy of the products.
- D.
Energy is given off during the reaction, making the energy of the reactants greater than the energy of the products.
- 4.Which of the following causes a change in state from liquid to gas?
- A.
High kinetic energy
- B.
A chemical reaction
- C.
Hydrogen bonding
- D.
Temperature at freezing point
- 5.What process takes place when the average energy of a gas’s particles decreases?
- A.
Condensation
- B.
Vaporization
- C.
Boiling
- D.
Melting
- 6.∆EUniverse = ∆ESystem + ∆ESurroundings = 0
- A.
Conservation of energy.
- B.
Conservation of mass.
- C.
Definite composition.
- D.
Multiple proportions.
Questions: 10 | Attempts: 48694 | Last updated: Aug 26, 2021
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