Vocabulary （Guess a word)
Anything that has mass (weight) and takes up space. What is the word?
MATTER
Is crushing an aluminium can a physical change？ Why?
Yes, it involve changes of shape and size.
Is rust an example of a chemical change?
Yes, new substances is formed in rusting process
What is particles made up of?
atoms
Name the reactants in respiration process
glucose and oxygen
Substance that react during chemical reaction？What is the word?
Reactant
Is ice melting a physical change? Why?
Yes, it involve changes of state from liquid to gas. No chemical reactions is involved.
State 2 indicators of chemical changes.
color change, bubbles, temperature change
Name the 3 types of matter.
SOLID, LIQUID, GAS
Give an example of chemical reaction.
Combustion,Corrosion, Photosynthesis, hydrogen react with oxygen to form water.
Substance that formed after a chemical reaction. What is it?
Product
Give an example of physical change.
Mixing, dissolving substance in liquid, crushing an object.
Name a food that goes through chemical change process.
Cake, beer, yeast
These molecules can move freely and will take the shape of any container you put them in.
LIQUID
Give 3 example of gases that might be released in a chemical reaction?
Oxygen, carbon dioxide, hydrogen
What is another name for burning?
Combustion
What is the changes you can observe in physical change?
Change in size, shape or change in state of matter.
True or False?Turning peanuts to peanut butter is an chemical change. Why?
FALSE.To make peanut butter, you grind up roasted peanuts, so nothing new is being created.
These molecules move rapidly and freely whereever there is open space.
GAS
What is the name of compound that is produced in a corrosion reaction?
Iron oxide
What is another name for rusting?
Corrosion
Explain how the water cycle is an example of a physical change.
It involve changes of state from liquid to gas or gas to liquid. water changes from a liquid to a gas when it evaporates, then forms back into a liquid when it condensates. The whole water cycle is repeated.
Explain how a rocket launch is an example of a chemical change.
There is chemical reaction between rocket fuels and other chemicals inside the rocket to propel it into the space.
Give 1 example of solid, liquid and gas.
Solid- desk, book
Liquid- water, lemonade
Gas- helium, air
How do you prevent rusting or corrosion?
Coat the surface with oil or paint
Galvanize the iron with more reactive metal such as zinc.