I need all these answered ID: A Class Date: Name CHPS. 12&13 True False Indicate

Question

I need all these answered ID: A Class Date: Name CHPS. 12&13 True False Indicate wesher the ssdement is re or alse . All substances become more dense as they get colder 2. Given the same change in temperature, liquids tend to undergo thermal expansion to a greater extent than solids, but less than gases. 3. It takes a great deal of energy for liquids to evaporate because of strong cohesive forces in the liquid. 4. The meniscus formed on the top of a layer of water in a graduated cylinder is a result of the strong adhesive force between the water and the glass. Multiple Choice ldentify the choice that best completes the statement or answers the question -5. closed tin is heated, the pressure inside it increases. This happens because: When a. The number of molecules increases on heating b. The molecules move faster and each molecule strikes the walls of the tin more often. The molecules become heavier and strike the walls of the tin harder. The molecules now collide more with the walls of the tin than amongst themselves. d· 6. A solid is heated at a constant rate until it reaches the vapor state. The temperature of the substance with time as shown in the graph below. Which part(s) of the graph indicate(s) that the substance exists in solid-liquid and liquid-vapor state? Time a OP b. OP, QR, ST c. PQ, RS d. OP, ST

Explanation / Answer

(1) True

Reason: The intermoleculer space between molecules of the substance decreases with decrease in the temprature of the substance.

(2) True

Reason: Because the attractive force between the molecules of liquids is less than the solids and greater than the gases.

(3) True

(4) True

(5)

The answer is (b).

Reason: The kinetic energy of the molecules increases.

(6) The answer is (c).

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