Energy

What is energy?

• the capacity to do work

• a change from one form to another

• a change to an entirely new substance

• a process in which energy is released

Samantha was cooking spaghetti and put water to boil. Once she saw vapor rising from the pan of water, she remembered that this is an example of a

• physical change

• chemical change

Joshua was making a tuna salad and he thought he would add a couple of hard boiled eggs. When he finished cooking the eggs, he remembered this is an example of a:

• physical change

• chemical change

True or false? Energy is involved even in a physical change, for example when an ice sculpture is melting?

• True!

• False!

Any change in matter in which energy is absorbed is known as an ____________ process.

Any change in matter in which energy is released is known as an ____________ process.

The worst industrial disaster in U.S. History is known as the Grandcamp Explosion. A small fire occured in a cargo ship with fertilizer, causing the ship to explode. The explosion was heard 240 km away. An anchor from the ship flew through the air and created a 3 m wide hole in the ground where it landed. This catastrophe is an example of an

• endothermic chemical process

• exothermic chemical process

What is the difference between heat and temperature?

• heat is not measurable and temperature is measurable

• heat is specific and represented by a number

• temperature is not specific

• they are both the same

Specific heat is expressed by the following unit:

• joules per gram kelvin

• kelvin

• joules per mg

• joules per mg kelvin

Convert 100 degrees Celsius to Kelvin: