Chemical reactions

In a chemical reaction

• New substances are formed, old substances disappear

• There are reactants and products

• Energy is either absorbed or given off

• All are correct

What are the types of equations that can be used?

• Word equations and chemical equations

• Word equations and balanced equations

• Reactants and products

methane + oxygen --> carbon dioxide + water

• Combustion

• Single displacement

• Acid and base

What are the reactants?

• Starting material of the chemical reaction

• New substances formed by the chemical reaction

What are the products?

• Starting material of the chemical reaction

• New substances formed by the chemical reaction

What is the word equation? When propanol is burnt in oxygen gas, carbon dioxide and water are formed

• propanol + carbon dioxide --> water + oxygen

• propanol + water --> carbon dioxide + oxygen

• propanol + oxygen --> carbon dioxide + water

• propanol --> carbon dioxide + water

Word equations...

• Show reactants and products as well as the amount of each in a reaction

• Show reactants and products but not the amount of each in a reaction

Law of conservation of mass

• Matter in the products is higher than in the reactants

• Matter in the reactants is higher than in the products

• Mass of the reactants must equal mass of the reactants

How many grams of reactants will I have if I end up with 50g of products?

• 50g

• 25g

• 100g

16g of methane react with 32g of oxygen to form 44g of carbon dioxide and 4g of water. What are the products?

• methane and oxygen

• water and carbon dioxide

• carbon dioxide and oxygen

• water