Chemical Balancing
Balance the equation:
H2 + O2 => H2O
2H2 + O2 => 2H2O
This type of substance is corrosive, tastes sour, and has a pH between 1-6
Acid
This element is found in 90% of all compounds and is essential to organic chemistry
Carbon
When silver metal is exposed to sulfur, it reacts to form silver sulfide
Silver + sulfur => Silver sulfide
Mr. Warren mistakes his water bottle for a bottle of an unknown solution and drinks it. He uses an indicator to test the pH, and it has a pH of 8. Did Mr. Warren drink an acid, base, or something neutral?
A weak base
Balance the equation:
P4 + O2 => P2O5
P4 + 5O2 => 2P2O5
This type of chemical reaction expels heat into its surroundings
Exothermic
These chemicals change colour to show whether a substance is acidic, basic or neutral
Indicators
Methane gas burns to form carbon dioxide and water.
Methane + oxygen => Carbon dioxide + water
Mr. Warren lights his Bunsen burner and closes the airhole. What colour will the flame be, and what kind of combustion reaction is this?
Yellow/orange. Incomplete combustion.
Balance the equation:
Mg + O2 => MgO
2Mg + O2 => 2MgO
This type of reaction requires oxygen and involves an explosion
Combustion
These compounds are new substance formed by a chemical reaction
Products
Iron becomes iron chloride after reacting with chlorine gas
Iron + chlorine => Iron chloride
Mr. Warren is shrunk down small enough that he can observe atoms. He examines an atom and sees that it's made of 3 types of subatomic particles. What are the names of these particles?
Proton, neutron and electron
Balance the equation:
CH4 + O2 => C + H2O
CH4 + O2 => C + 2H2O
This type of substance is typically dull and brittle
Non-Metals
This type of reaction requires heat to proceed
Endothermic
Potassium hydroxide reacts with sulfuric acid. Potassium sulfate and water are formed in the reaction.
Potassium hydroxide + sulfuric acid => Potassium sulfate + water
Balance the equation:
2C8H18 + 25O2 => 16CO2 + 18H2O
2C8H18 + 25O2 => 16CO2 + 18H2O
Its already balanced :)
This type of reaction happens only to metals
Corrosion
This law states that both sides of a chemical reaction must have the same amount of atoms
Conservation of Mass
Sodium corrodes quickly in water, creating sodium hydroxide and releasing hydrogen gas.
Sodium + water => Sodium hydroxide + hydrogen