Physical and Chemical Changes
What type of change can usually be reversed, physical or chemical?
Physical Change
What is kinetic energy?
Energy in motion.
What is matter?
On a line graph, which axis is for the independent variable?
x-axis
The ability to do work or produce heat is called what?
energy
Name one clue that indicates a chemical change has occurred.
heat/light given off, gas formed, color change, or smell given
Which force holds the nucleus of an atom together?
Strong Nuclear Force
Water is an example of a compound or an element?
compound
What is the formula for slope?
slope = Δy / Δx
What do we call a specific part of the universe being studied in energy changes?
system
True or False? Boiling eggs is a physical change.
False, it is a physical change.
Name the force that causes attraction between massive bodies like planets.
Gravity
What do you call a substance made of only one kind of atom?
element
What type of graph is best to show parts of a whole?
pie chart
What term describes the smallest particle of an element?
atom
What is an example of a physical property?
texture, shape, size, color, odor, volume, mass =, weight, density, and specific heat
List two types of non-mechanical energy.
chemical, nuclear, thermal, radiant, electrical
What is the difference between a molecule and a macromolecule?
macromolecule is made of hundreds of atoms, while a molecule has two or more atoms
A scientist tests how different amounts of sunlight affect the growth of a plant. She places several plants in pots and gives each one a different number of hours of sunlight each day. After two weeks, she measures how tall each plant has grown. What is the independent variable?
the number of hours of sunlight each plant receives.
What do we call a substance made of two or more elements chemically bonded 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 new substances
What is an example of potential energy?
answers will vary
Arrange these particles from lightest to heaviest: proton, neutron, electron.
electron, proton, neutron
What is the slope of the line in the equation 3y−12x=9
The subatomic particle located in the nucleus with no electrical charge is called?
neutron