Matter & Weight
What happens to the weight of a material when you add equal amounts of different materials?
the total weight increases by the sum of the weights of the added materials.
What is a physical change?
A change that does not result in a new substance, like melting ice.
What is a solution?
A mixture where one substance dissolves in another, like saltwater.
How does heating affect most materials?
It generally causes them to expand.
What is the process of making something less warm or lowering its temperature called?
cooling
If you have a rock that weighs 5 grams and you add a 3-gram piece of clay, what is the total weight?
8 grams
What is a chemical change?
A change that results in the formation of a new substance, like burning wood.
What is a mixture?
A combination of two or more substances that do not chemically bond, like salad. The substances can be taken apart.
What happens to an inflated balloon that is left in the cold?
It will loose heat and deflate.
What is the process of making something warmer called?
Heating
When you mix sand and salt, what happens to the total weight of the mixture?
The weight remains the same; it is the sum of the weights of sand and salt
Give an example of a chemical change you might see in your kitchen.
Baking bread or spoiling food.
How can one prove that ice and water are the same substance?
Freeze the water.
How does heat affect molecules.
It causes them to move faster, increasing the rate of a reaction.
When two objects become the same temperature it is known as
Thermal equilibrium
How does the weight change when you dissolve sugar in water?
The total weight increases because you add sugar to the water.
What observable changes indicate that a chemical change has taken place?
Color change, temperature change, gas formation, or odor change, new substance was created.
If you combine sand and water in a container, can you separate the sand from the water? Is this a solution or a mixture, why?
This is a mixture because you can separate the sand from the water using filtration.
How does cooling affect molecules.
It causes molecules to slow down, decreasing the rate of a reaction time.
What word means packed tightly together; heavy for its size? (Example: A rock is more dense than a sponge.)
Dense
Why does a metal can weigh less after it is crushed?
The weight does not actually change; it is just the shape that changes, making it easier to handle.
Why is rusting considered a chemical change?
Because it forms a new substance (rust) that has different properties from the original metal.
What are 2 materials that conduct heat well? What are two materials that do not?
Metal, water, wood, wool.
________ is how heavy something is, or the pull of gravity on an object.
Weight