Chemical Equations Flashcards
What is an aqueous solution?
A solution of a substance dissolved in water.
Define balanced equation:
A chemical equation in which the number of each type of atom is the same on both sides of the equation. They are constant with the law of conservation mass.
What is a chemical equation?
A short-hand notation that scientists use to communicate what happens during a chemical reaction. It describes what happens in the reaction.
What is a formula equation?
A chemical equation where the reactants and the products are identified by their chemical formulas.
CaCo3 + H2SO4 > CaSo4 + CO2 + H20
What is the law of conservation of mass?
The law that states that atoms cannot be created or destroyed during a chemical reaction. As a result the number of atoms will be equal on both sides.
What is a product and a reactant?
A substance produced by the chemical reaction.
The initial substance of a chemical reaction.
What is a word equation?
A chemical equation where the reactants and products are identified by their chemical names.
Calcium carbonate + sulphuric acid > calcium sulfate + carbon dioxide gas + water.
What are the four states reactants and products can be in?
Solid, liquid, gas and an aqueous solution.
Explain unbalanced equations:
When hydrogen gas reacts with oxygen water is the product. H2 + O2 > H2O(1). There is one oxygen atom left over. The equation is not balanced. But instead of one of each molecule having 2 molecule of hydrogen will balance the equation. 2H2 + O2 > 2H2O
How to test for oxygen?
A glowing wooden splint relights in a test tube of oxygen.
How to test for hydrogen?
A lighted wooden splint makes a popping sound in a test tube of hydrogen.
How to test for CO2?
A lighted wooden splint goes out in a test tube of carbon dioxide but this happens with other gases, too. It is better to bubble the test gas through limewater - calcium hydroxide solution. Carbon dioxide turns limewater cloudy white.
List the ways to increase the rate of a reaction?
- temperature
- concentration
- surface area
- agitation (mixing/ stirring)
- catalyst
Explian 2 ways in which heat can speed up the rate of the reaction.
- It will give the particles more energy.
- it will cause the particles to move more quickly causing them to collide more frequently.
Name 2 fast reacts and 2 slow reactions.
Fast: explosion, combustion.
Slow: fermentation, ripening.
