Physical and Chemical Changes
What type of change can usually be reversed, physical or chemical?
physical changes
What is kinetic energy?
Energy in motion
Which force holds the nucleus of an atom together?
Strong Nuclear Force
Water is an example of a compound or an element?
compound
anything that has mass and takes up space.
matter
Name one clue that shows a chemical change has occurred.
Heat/light given off, gas formed, color change, or smell given off
List two types of non-mechanical energy.
Chemical, nuclear, thermal, radiant, electrical
Name the force that causes attraction between massive bodies like planets.
Gravitational or gravity
Gold and Sulfur are examples of what?
the ability to do work or produce heat.
energy
True or False? Boiling eggs is a physical change.
False, it is a physical change.
What is an example of potential energy?
answers vary
what energy holds other subatomic forces together?
weak force
oil and water mixed together are examples of heterogeneous or homogeneous mixtures?
heterogeneous mixture
what makes up all matter and is made of the same type of atom?
elements
What is an example of a physical change?
answers vary
What are the two types of mechanical energy?
Kinetic and Potential energy
What kind of force happens when you stick a magnet to a fridge?
Electromagnetic force
What to subatomic particles are located in the nucleus?
proton and neutron
what is made of two or more different elements in a definite ratio?
compound
Explain why melting ice is a physical change but burning paper is a chemical change.
melting ice changes its state but keeps the same substance, while burning paper produces a new substance.
What kind of energy happens when you boil water on a stove?
Thermal energy
If I drop a ball from a tall building what force is causing the ball to fall towards the ground?
Gravitational
What subatomic particle has a negative charge?
electron
what is it called where every part of a mixture looks the same and you cannot see a difference?
homogeneous matter or mixture