Category 1
A slow chemical reaction that occurs when oxygen in the air combines with a metal.
Corrosion
This chemical reaction takes place in the cells of your body. Food reacts with oxygen to produce energy, water and carbon dioxide.
Cellular Respiration
Which of the following chemical reactions is endothermic?
Photosynthesis in plants
What is the Law?
The total mass of the products is always the same as the total mass of the reactants.
Law of Conservation of Mass
A system that allows materials to enter or leave the chemical reaction. Mass will ALWAYS be conserved, but it cannot be accounted for.
Open System
This reaction is a high temperature exothermic chemical reaction that uses oxygen as one of the reactants.
Combustion
The speed at which a chemical reaction takes place.
Reaction Rate
Provide 4 evidence that indicate a chemical reaction has occurred.
Colour Change, Odour Forms, Solid or Gas Forms, Heat is released or absorbed
Which of the following chemical reactions is exothermic?
4. Toothpaste neutralizing mouth acid from bacteria
In which situation is mass fully accounted for?
2. Vinegar and baking soda sealed in a balloon
A reaction produces 50 g of carbon dioxide and 18 g of water. If the reactants were methane and oxygen, what was the total mass of reactants?
68g
Substances that help a chemical reaction proceed faster, but they remain unchanged.
A Catalyst
Why would human life not be possible without enzymes?
Enzymes are biological catalysts that speed up the essential chemical reactions of our body. Without them, reactions like digestion, respiration, and DNA repair would occur far too slowly to sustain life.
True or False?
Increasing the concentration of reactants usually slows down a reaction.
False
Sodium reacts with chlorine:
2Na+Cl2 ---> 2NaCl
If 46 g of sodium reacts completely with chlorine to produce 116 g of sodium chloride, what mass of chlorine was used?
70g
The branch of Chemistry that studies the relationships between the amounts of reactants and products in a chemical reaction.
Stoichiometry
Substances that slow down chemical reactions.
Inhibitors
True or False?
Chewing food increases its surface area, which speeds up digestion.
True
What is the matching effective method for increasing this rate of reaction.
"Iron (II) chloride forms over time, when iron and chlorine gas are combined."
Add a catalyst
What is the Law?
When two elements combine to form more than one chemical compound; the mass of the second element that combines with 1 g of the first element are in a ratio of small whole numbers.
Law of Multiple Proportions
The process of coating metals with a thin layer of zinc to protect the metal from corrosion.
Galvanization
Balance the following equation:
NaNO3 ----> NaNO2 + O2
2 NaNO3 ----> 2 NaNO2 + O2
Balance the following equation:
ZnS + O2 → ZnO + SO2
2 ZnS + 3 O2 → 2 ZnO + 2 SO2
True or False?
In CO and CO₂, the ratio of oxygen to carbon is always the same.
False
Balance the following equation:
NH3 + O2 → N2 + H2O
4 NH3 + 3 O2 → 2 N2 + 6 H2O