A student placed a liquid in a jar and sealed it. Then she heated the liquid and it turned into a gas. If the number of atoms in the sealed jar stayed the same, what happened to the mass of the jar and everything inside it alter she heated 1? The mass increased The mass decreased. The mass stayed the same. It depends on whether a chemical reaction occurred. B.

6. Two students place three ice cubes in a glass of water that was at a room temperature. Which of the following scenarios would best describe the result of the investigation? A. Energy from the water will transfer to the ice cubes, causing the ice to melt. B. Cold from the ice cubes will transfer to the water, causing the water to cool. C. The ice cubes will melt due to the external heat. D. The water will have no reaction on the ice cubes even wvhen it melts. 7. A student decides to take up diving as a hobby. He stands on a high-dive that is 4m tall. If the student has a mass of 50 kg, what is his potential energy (PE)? C. 1890 J D. 2130 J A. 200 J B. 1960 J 8. A solar calculator has to have light in order to work. What does the radiant energy transform into? A. radiant B. solar C. potential D. chemical 9. What would happen if a net force is acting on an object? A. its velocity must be constant B. its velocity must be changing C. its mass must be changing D. its acceleration is zero

Heat is? a.) the amount of thermal energy in an object. b.) the energy that moves from a hotter object to a colder object. c.) a fluid-like substance that flows from a hotter object to a colder object. d.) all of the above

stion 3 If the temperature of the surface of the object is 4 K, then calculate yet vered its value in "F. ked out of O a. 466.60 ОБ. -269.00 lag question O c. -452.20 O d. 39.20

Temperature is a microscopic concept. a) True b) False

According to kinetic theory of gases, molecules collision with the walls of container produce the O a. Pressure, temperature and volume of the gas Ob. Temperature of the gas O . Pressure of the gas Od. Volume of the gas

Generally, when a material is heated what will happen to its density? Explain.

Hemoglobin has a molecular mass of 64 500 u. Find the mass (in kg) of 273 molecules of hemoglobin. Number MO Units

100 grams of Aluminum ( c = 0.9 j/gC) at 100 C is added to 100 grams of water (c = 4.19 j/gC) at 20 C. The final temperature of the mixture will be Group of answer choices A. Less than 60 C B. 60 C C. More than 60 C

Which of the following equations can be used for calculating the amount of heat required to change the temperature of a material of mass m by AT. The material has specific heat capacity of cand latent heat of L. A. Q = mL B. Q = mc AT C. Q = mc AT + ml D. Q = m AT