3. Which of the following statements is TRUE for gases? i. The temperature of a

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3. Which of the following statements is TRUE for gases? i. The temperature of a gas is inversely proportional to its pressure. ii. The volume of a gas is directly proportional to the pressure in torr. ii. The pressure of a gas is due to collisions of the gas molecules. a. i on c. ii onl d. iand ii only e i and ii only If the same amount of heat is added to 80.0 g of each of the common substances below, which metal will undergo the largest temperature change? 4. Specific heat (J/g°C) a. Au(s) Au(s) 0.13 Fe(s) 0.45 Al(s) 0.90 Cu(s) 0.38 C(s) 0.71 b. Fe(s) c. Cu(s) d. C(s) e. Al(s) 5. Which of the following is not a postulate of the kinetic-molecular theory of gases? All gases consist of atoms and molecules moving randomly in all directions at various speeds b. a. T he average kinetic en ergy of gas m as the temperature The volume of a gas molecule is negligible when compared to the space that separates it from other gas c. molecules d. There are no attractive or repulsive forces between gas molecules Gas molecules will eventually stop colliding due to the energy lost in each collision. e. 6. A heating curve illustrates a. The changes in the temperature and physical state of a substance as it is heated. b. What happens to the heat applied as the temperature is increased. c. What happens to the particles of a substance as it is heated. d. The chemical changes that occur as the substance is heated e. What a substance looks like as it is heated. An ionic compound has a solubility of 30 g per 100 mL of water at room temperature. A solution containing 70g of the compound in 300 mL of water at the same temperature is: 7. c) suspension a) saturated d) supersaturated b) unsaturated e) colloid

Explanation / Answer

3)

ideal gas law is:

P*V = n*R*T

P is proportional to T

So, i is false

V is inversely proportional to P

So, ii is wrong

iii is correct

Answer: b

4)

Q = m*C*delta T

Q and m is same for all

So, the one with lowest C, will undergo largest delta T

C is lowest for Au(s)

Answer: a

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