Properties of Matter
What are the two main types of properties used to describe matter?
Physical and Chemical
Is freezing water a physical or chemical change?
Physical
What are the 3 states of matter?
Solid, liquid, gas
What are two ingredients in bath bombs that cause fizzing?
Baking soda and citric acid
What’s one piece of evidence that a gas was produced?
Bubbles, fizzing, release of a smell
Is melting ice a physical or chemical change?
Physicallll
What kind of change occurs when iron rusts?
Chemical
Law of Conservation of Matter says that matter can not be _______ or ________
Created or destroyed
Why does a bath bomb fizz and bubble when it is added to the water?
Because a chemical reaction is occurring- the bath bomb is producing a gas!
In an experiment, how do you know gas is being made if you can’t see it?
Look for indirect signs like inflation, change in mass, or pressure build-up
In what direction does a less dense gas travel in the presence of a more dense gas?
Upwards!
What are signs that a chemical change has happened?
Color change, temperature change, gas production, precipitate, change in mass
When I mix citric acid and baking soda in water, is the gas produced pure citric acid or baking soda
NOOO it would be a new product that was formed from both the particles in baking soda and citric acid
How could we test if the gas produced in the experiment had weight.
Weigh a bottle with the bath bomb gas inside and weigh the bottle once the gas has been released and check for a difference in weight.
In the presence of air, what direction will helium travel
UP
Name two physical properties you can observe without changing the substance.
Color
Shape
Texture
Density
Boiling Point
Why is dissolving sugar in water NOT a chemical change?
No new substance is formed.
Name the 2 major reactants involved in the elephant toothpaste lab.
Hydrogen peroxide and potassium iodide
If I put 3 bath bombs in a plastic bottle and hold a match above the bottle, what will happen to the flame of the match?
The flame will be extinguished because the gas released is not flammable
What animal is a primary producer of methane
cows!
What is the difference between a physical and a chemical property?
Physical = observed without changing substance; Chemical = only seen when substance changes
A piece of paper is torn into tiny pieces, and then another piece of paper is burned. Explain which change is physical, which is chemical, and how you can tell the difference.
Tearing the paper is a physical change because it only changes the paper's size and shape — no new substance is formed. Burning the paper is a chemical change because it creates new substances like ash, smoke, and gas, and the change cannot be reversed.
The elephant toothpaste experiment was an ________ reaction because it produced heat.
Why is the bath bomb reaction a chemical change?
A new substance (gas) is produced
Name two properties of gas (that we have used) to help us identify gases
Flammability and density