Unit 5

Question 1

Endothermic

Answer 1

when heat flows into (enters) a system; Triangle Heat = (+) positive

Question 2

Exothermic

Answer 2

when heat flows out of (exists) a system; Triangle Heat= (-) negative

Question 3

Specific Heat

Answer 3

The amount of heat energy needed to change a substance’s (chemicals) temperature; can be used to change the state of matter (Aka…)

Question 4

Latent Heat

Answer 4

The Amountof heat energy needed to change the state of matter

Question 5

what does temperature measure in terms of atoms and molecules?

Answer 5

Temperature measures how fast atoms and molecules are moving/vibrating

Question 6

What is the difference between a food calorie and a scientific calorie?

Answer 6

1 food calorie = 1,000 Science calories

Question 7

Why did we set the food sample on fire?

Answer 7

To extract it’s heat energy; to release the heat energy in the heat and transfer it to vile so we could measure it

Question 8

What was the purpose of measuring the change in temperature change of the water in the test cube?

Answer 8

To determine how much energy was in the sun chips

Question 9

describe the arrangement and motion of the particles of a solid

Answer 9

Slower moving particles are typically closer together, fixed in an ordered pattern, and maintain their shape despite its container

Question 10

Describe the arrangement of the particles in a liquid.

Answer 10

Medium speed at motion, medium average distance, mildly disordered, forms to the bottom of the container

Question 11

Describe the arrangement and motion of the particles of gas

Answer 11

Fast moving, farther part, very disordered, form to the whole container

Question 12

What is the difference between the latent heat of fusion and the latent heat of vaporization? Would these numbers be the same?

Answer 12

Latent heat fusion is from the solid to liquid, and vice versa. The latent heat of vaporization is from liquid to gas.

Question 13

using the language of heat and energy; describe why it is when your sweat evaporates off your skin cools down.

Answer 13

The heat energy vaporizes into the air through the latent heat of evaporation. Leaving your body with a cooler temperature/less heat energy

Question 14

Using the language of heat and energy; describe why it is when 100 C steam condenses onto your hand it hurts, but when 100 C touches your hand it doesn’t hurt.

Answer 14

Condensation (gas to liquid) gives off (exothermic) because of the latent heat of evaporation