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WorksheetsCHEM: Heat & Energy (with calculations)
Total questions: 14
Worksheet time: 15mins
Which of the following is an example of a number written in scientific notation?
3.45
3.45 x 104
345 x 102
3.45 x 102
Convert 420 Joules into calories
(a)
Convert that number into Calories
(b)
How many calories are in a dinner containing 3.5 x 102 joules?
(a)
How many Calories are in that same dinner?
(b)
When a piece of aluminum foil is taken out of the oven and cools from 125° C to 53°C, What is the change in temperature?
72°C
178°C
125°C
53°C
How would you write 36,820,000 in Scientific Notation?
How would you write 0.0023 in Scientific Notation?
Match the number in standard notation to it's match in scientific notation:
3.5 x 103
3,500
3.5 x 10-3
0.0035
3.5 x 107
35,000,000
3.5 x 10-7
0.00000035
3.5 x 100
3.5
Select all that are TRUE: A runner eats a meal with a nutritional energy of 548 Calories. After her meal, she burns 2.0 ✕ 106 joules while running.
there were 548,000 calories of energy in the meal
there were 2.29 x 106 joules of energy in the meal
the runner burned 478 Calories during her run
the runner ate less Calories than she burned
the runner burned 4.78 x 105 calories
Match the type of energy to the correct example:
coal
chemical potential energy
fuel burning
thermal energy
charged particles
electrical energy
radio
sound energy
runner
kinetic energy
A(n) (a) system is one where matter and energy can both be transferred in and out. A(n) (b) system is one where only energy can be transferred in and out.
You want to calculate the energy released by the battery and absorbed by the cell phone. What is one assumption that you will need to make in order for the model to be considered a closed system?
energy flows from the cell phone to the surroundings
energy flows from the battery to the surroundings
100% of the energy from the battery goes into the cell phone
the cell phone receives energy from the battery and the surroundings
Which scenario represents a closed system?
an ice pack being held on an injury
a campfire burning outdoors
the sun heating up the ocean
the human body
How do you measure the kinetic energy of the molecules in a substance?
temperature
momentum
velocity
mass
When you take the temperature of a substance, what are you really measuring?
the average kinetic energy of ALL of the molecules
the kinetic energy of ONLY the fastest molecule
the kinetic energy of ONLY the slowest molecule
the average kinetic energy of ONLY the fast molecules
