Unit 2 - Practice Exam

In an exothermic process, the surroundings are gaining energy.

• True
• False

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

How do you figure out "ΔT"?

• measure the temperature and write it down

• calculate: final temperature - initial temperature

• calculate: intitial temperature - final temperature

• calulate: final temperature divided by initial temperature

(You may use scratch paper and a calculator)

How much energy is required to change 30 grams of water from 20 ^οC to 90 ^οC?

The specific heat of water = 1 cal/g^oC

• 70 J

• 2100 J

• 2700 J

• 600 J

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The symbol for "specific heat" is .......

• c

• Q

• m

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

In this Equation "q" stands for

• Mass of Fuel

• energy absorbed or released by the substance

• change in temperature

• mass of substance being heated

• amount of energy needed to raise the temperature for that substance

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

There are 2 pans of water: One has 100 mL in it and one has 1000 mL. You add 4000 joules of energy to each. Which one will have a greater change in temperature?

• the one with 100 mL

• the one with 1000 mL

• Since they have the same substance, they will both heat to the same temperature

• They both will cool down.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Complete this conversion Factor: 1kcal = ___ cal

• 1000

• 4.18

• 1/1000

• 1/4.18

Refer to the unit conversion relationships in your notes. You may use scratch paper and a calculator

Convert 250 cal = ______ Joules

• 1,045

• 59.8

• 0.250

• 250,000

Refer to the unit conversion relationships in your notes. You may use scratch paper and a calculator.

Convert 500 Joules = _____ cal

• 119.6

• 2090

• 500,000

• 0.5

Refer to the unit conversion relationships in your notes. You may use scratch paper and a calculator.

Convert 75 kJ = ____cal

• 17.94

• 17,943

• 75,000

• 0.75