What is the definition of a physical change? Give an example.
Causes something to look different but still same substance and made of same particles. Its reversible
Ex. ice melting, crushed chips
100
What are the 3 states of matter?
Solid, liquid, gas
100
What is it called when a gas changes into a liquid?
Condensation
200
Define a Heterogeneous mixture and give an example.
What is a mixture where to or more substances can be physically separated
Ex. Cookie dough ice cream and trail mix
200
What are the 4 properties of matter?
Mass, volume, density, and weight
200
What is the definition of a chemical change? Give an example.
Causes a new substance to form and particles are rearranged.
Ex. Rust or fire
200
Describe the particles in a solid.
Close together and little movement
200
What is it called when a liquid changes into a gas?
Evaporation
300
Define a Homogeneous mixture and give an example.
A mixture in which 1 or more substances dissolve in another.
Ex. Lemonade, syrup
300
What is the definition of matter?
Anything that takes up space and you can find the mass and volume of
300
When something goes through the states of matter is it a physical or chemical change? Explain.
Physical, particles are still the same. Water particles are still water particles if it is ice.
300
Describe the particles in a liquid.
Near each other and constant movement
300
What joins together to form particles and molecules?
Atoms
400
Name the 2 types of mixtures?
Heterogeneous and Homogeneous
400
What is the smallest unit of matter?
An atom
400
Adding heat causes a material to change. If removing heat causes the material to return to the way it was, the change was probably what kind of change?
Physical
400
Describe the particles in a gas.
Far apart and fast movement
400
How much matter is in something is called what?
Mass
500
Explain how a mixture of sugar and water is different from a mixture of sand and water?
Sand and water is a heterogeneous mixture and can be physically separated and sugar water is a solution or homogeneous mixture and the sugar is dissolved in the water.
500
True or False. Atoms and molecules are 2 kinds of particles.
False
500
An old pumpkin starts to rot, physical or chemical change?
Chemical
500
Describe volume and shape for each state of matter.
Solid- fixed volume and shape
Liquid- fixed volume and not fixed shape
Gas- neither fixed volume nor shape