Chemistry Se 11 B

6 Questions | By Robmid28 | Updated: Mar 20, 2022 | Attempts: 205

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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.

∆E_Universe= ∆E_{System +}∆E_Surroundings= 0
- A.
  
  Conservation of energy.
- B.
  
  Conservation of mass.
- C.
  
  Definite composition.
- D.
  
  Multiple proportions.