Chemistry Daily 10’s Week 17.

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Presentation transcript:

Chemistry Daily 10’s Week 17

1 1. Which of the following best describes temperature? a. energy as heat absorbed or released in a chemical or physical change b. a measure of the average kinetic energy of the particles in a sample of matter c. energy in the form of heat d. energy of change

2. How is a Celsius temperature reading converted to a Kelvin temperature reading? a. by adding 273.15 b. by subtracting 273.15 c. by dividing by 273.15 d. by multiplying by 273.15

2 1. What units are used to measure specific heat? a. J/(g·°C) b. J/(g·K) c. cal/(g·°C) d. All of the above

2. A 4. 0 g sample of iron was heated from 0°C to 20. °C 2. A 4.0 g sample of iron was heated from 0°C to 20.°C. It absorbed 35.2 J of energy as heat. What is the specific heat of this piece of iron? a. 2816 J/(g·°C) b. 2.27 J/(g·°C) c. 2.27 J/g d. 0.44 J/(g·°C)

3 1. How much energy is absorbed as heat by 20. g of gold when it is heated from 25°C to 35°C? The specific heat of gold is 0.13 J/g·°C. a. 26 J b. 26 J/(g·°C) c. 0.0006 J d. 0.0006 J/(g·°C)

2. Ice melting is an example of a(n) a. exothermic reaction. b. negative entropic reactions. c. endothermic reaction. d. catalysed reaction.

4 1. To be effective, a collision requires a. sufficient energy. b. a favorable orientation. c. sufficient energy and a favorable orientation. d. a reaction mechanism.

2. Which attempts to explain chemical reactions and physical interactions of molecules? a. chemical kinetics b. collision theory c. thermodynamics d. thermochemistry

5 1. If a collision between molecules is very gentle, the molecules are a. more likely to be favorably oriented. b. less likely to be favorably oriented. c. more likely to react. d. more likely to rebound without reacting.

2. Activation energy is a. the energy required to form the activated complex. b. the net energy required to turn reactants into products. c. the enthalpy of reaction. d. free energy.

Answers & Standards 1.1. ANS: B STA: SC6.b 1.2. ANS: C STA: SC6.b 2.1. ANS: D STA: SC6.b 2.2. ANS: D STA: SC6.b 3.1. ANS: A STA: SC6.b 3.2. ANS: B STA: SC6.b 4.1. ANS: C STA: SC5.c 4.2. ANS: B STA: SC5.c 5.1. ANS: D STA: SC5.c 5.2. ANS: A STA: SC5.c