IS1 - Units of Energy/ Energy Conversions

The SI (standard internation) unit of heat and energy is __________.

• calorie

• heat

• joule

• celsius

In an exothermic process, the surroundings are gaining energy.

• True
• False

Tags

NGSS.HS-PS1-4

Which direction will the heat flow while this person holds a hot cup of tea?

• from the cup to her hand
• from her hand to the cup
• no heat is transferred

Tags

NGSS.HS-PS3-4

Which of the following are true?

(Choose 2 correct answers)

• A Calorie is also known as a food calorie

• A calorie and a kilocalorie are the same thing

• 1 kilojoule = 1000 joules

• Celsius is a unit of energy

Tags

NGSS.HS-PS3-4

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

In an exothermic reaction

• the reactants have more energy than the products

• the reactants have less energy than the products

Tags

NGSS.HS-PS1-4

Convert 85 calories to Joules. When you set up your work on your paper, which conversion factor should you use?

•  $\frac{1\ cal}{4.18\ J}$  

•  $\frac{4.18\ J}{1\ cal}$  

•  $\frac{1\ J}{4.18\ cal}$  

•  $\frac{4.18\ cal}{1\ J}$