PvC
___________ is a type of change that changes its state but does not create a new substance.
A. Physical Change
B. Chemical Change
A
What do you call the substances that you begin with in a chemical reaction?
A. Products
B. Reactants
B
A. Decreases
B. Increases
B
What is a natural reaction that occurs when a metal slowly breaks down due to it reacting with its environment?
A. Corrosion
B. Rusting
C. Oxidation
A
What is the scientific name for burning?
A. Oxidation
B. Burning
C. Combustion
C
Fill in the blanks.
Grinding coffee beans is a ___________ change and dyeing my hair is a _________ change.
Physical --- Chemical
What are the products in this chemical reaction?
Magnesium + Hydrochloric Acid -> Magnesium Chloride + Hydrogen
Magnesium Chloride and Hydrogen
Fill in the blanks
_____ temperature and ______ reactant concentration decreases reaction time.
Lower/Lower
The chemical equation of rusting is as follows:
Iron + ______ + __________ -> Rust
What are the missing reactants?
Water and Oxygen
Fill in the blank.
The three types of fossil fuels are coal, petrol/oil and _____.
Natural Gas
The signs that we see when a chemical change occurs are as follows:
- colour change - creation of light and sound
- gas production
Give one more sign that is not stated above.
One of the following is Accepted
- Temperature Change
- Formation of Precipitate
- Change of Odour
In the chemical reaction:
Copper carbonate -> Copper Oxide + Carbon Dioxide
Copper carbonate is the __________ while Copper Oxide and Carbon Dioxide are the __________.
Fill in the blanks.
Reactant ------- Products
What do you call a substance that speeds up a chemical reaction without being used up or permanently changed?
Catalyst
What is the catalyst that is found in the ocean that speeds up the rusting process?
Salt
What are the reactants in rocket fuel?
Hydrogen and Oxygen
What do you call a solid that is created when mixing two liquids in a chemical change?
Precipitate
What is the name of the state that is used to describe the chemical as diluted or dissolved in water?
Aqueous
When putting food in the refrigerator, what process are we trying to slow down?
Rotting or Decaying
One way to prevent rusting is to use surface protection. Give at least two ways to do this.
Paint
Oil and Grease
Plastic Coating
Fill in the blanks.
The chemical equation of burning is:
Fuel + _________ -> ________ + Water
Oxygen ------- Carbon Dioxide
What do you call the process of changing from being a solid to a gas?
A. Freezing C. Sublimation
B. Condensation D. Deposition
What are the four symbols given in chemical equations to describe their state. Write the symbols only.
s, l, g, and aq
Increase Temperature
Increase Surface Area
Increase Reactant Concentration
Using a catalyst
In the Galvanizing process, what metal are we covering iron metal to prevent rusting?
Zinc
What do you call the process when substances react with oxygen?
Oxidation