WorksheetsHot Pack Engineering
Total questions: 10
Worksheet time: 11mins
Complete the claim: The temperature in the pack changed because when the (a) combined a chemical (b) occurred. Energy was (c) , making the pack feel (d) .
When atoms come together to form a chemical bond, energy is _________
Absorbed from the surroundings
Released into the surroundings
Created where it did not previously exist
Used up and then no longer exists
Exothermic reactions _________
Release more energy than they absorb
Absorb more energy than they release
Release and absorb exactly the same amount of energy
Can either release more energy than they absorb, or absorb more energy than they release, depending on the reaction
Energy is needed to break bonds in chemical reactions.
True
False
A chemical reaction in which more energy is absorbed than is released is endothermic.
True
False
Fill in the blanks to provide evidence of temperature change in your hot pack. The temperature (a) , which means that energy was (b) . This is an example of an (c) reaction.
What was the temperature change in your hot pack? Include a plus or minus sign and then the number; do not include units or words. (ex. -10 or +2)
Which reasoning did you choose in your slideshow?
Choice 1
(green slide)
Choice 2
(yellow slide)
Choice 3
(pink slide)
Choose the image that best represent your hot pack.
Choose the image that best represent your hot pack.
