Balancing
Balance the following:
N₂ + H₂ → NH₃
N₂ + 3H₂ → 2NH₃
What chemical reaction is the following:
2Na + Cl₂ → 2NaCl
Synthesis / Combination
The substances present before a chemical reaction occurs.
Reactants
A liquid changes from blue to green after another substance is added. What sign of a chemical reaction occurred?
Color change
What compound forms when hydrogen (H₂) reacts with oxygen (O₂)?
Water (H₂O)
Balance the following:
Fe + O₂ → Fe₂O₃
4Fe + 3O₂ → 2Fe₂O₃
What chemical reaction is the following:
AgNO₃ + NaCl → AgCl + NaNO₃
Double Displacement
A substance dissolved in another substance to form a solution.
Solute
A chemical reaction makes the container feel warmer. What kind of energy is being released?
Heat
What common compound forms when sodium (Na) reacts with chlorine (Cl₂)?
Salt / Sodium Chloride (NaCl)
Balance the following:
Al + HCl → AlCl₃ + H₂
2Al + 6HCl → 2AlCl₃ + 3H₂
What chemical reaction is the following:
CH₄ + 2O₂ → CO₂ + 2H₂O
Combustion
In 2H₂ + O₂ → 2H₂O, what term describes the number 2 placed before H₂O?
Coefficient
A tablet is placed in water and starts fizzing. What is being produced?
Gas
This compound, NaHCO₃, is commonly used in baking and can help dough rise. What is its common household name?
Baking Soda
Balance the following:
C₃H₈ + O₂ → CO₂ + H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Propane (C₃H₈) from a fuel source reacts with oxygen (O₂) and produces carbon dioxide (CO₂) and water (H₂O). What type of reaction occurred?
A substance that speeds up a chemical reaction without being permanently consumed.
Catalyst
A piece of carbon burns completely in an environment with plenty of oxygen. The reaction produces a colorless gas commonly released when fuels burn and when humans breathe out. What product was formed?
Carbon dioxide (CO₂)
Calcium carbonate (CaCO₃) is the main compound found in limestone and is commonly used to make this writing material.
Chalk
Balance the following:
FeS₂ + O₂ → Fe₂O₃ + SO₂
4FeS₂ + 11O₂ → 2Fe₂O₃ + 8SO₂
An iron nail is placed in a blue solution containing copper(II) sulfate. After some time, a reddish-brown layer of copper appears on the nail, while iron enters the solution as iron(II) sulfate. What type of reaction occurred?
Single Displacement
A reaction releases enough energy that the container becomes noticeably warmer without external heating. What term describes this type of reaction?
Exothermic Reaction
Nitrogen gas and hydrogen gas are reacted under suitable conditions. The resulting compound contains one nitrogen atom bonded to three hydrogen atoms and is widely used in fertilizer production. What product is formed?
Ammonia (NH₃)
A dilute solution of acetic acid (CH₃COOH) is commonly found in kitchens under what name?
Vinegar