What is an element?
A substance containing only 1 type of atom
What is a compound?
2 or more elements chemically combined
What is a reactant?
A substance that takes part in a chemical reaction
What is a product?
A substance produced in a chemical reaction
On which side of a chemical equation are reactants found?
The Left Hand Side (LHS)
On which side of a chemical equation are products found?
The Right Hand Side (RHS)
What does the "+" sign mean on the LHS of an equation?
What does the arrow mean in a chemical equation?
What does the + sign on the RHS of a word equation mean?
What is ALWAYS produced in a chemical reaction?
A new substance
What are the 5 signs of a chemical reaction?
- Gas given off
- Colour change
- Energy change (temperature, light)
- Solid formed
How can we detect energy changes in a reaction?
Using a thermometer to detect change in temp
Feeling heat given off by a reaction
Hearing sound energy
Seeing Light energy
What is meant by "collision theory"?
The idea that particles must collide in order to react
What is meant by temperature?
How does increasing temperature increase reaction rate?
The particles are moving faster and collide more often and with more energy.
How does increasing concentration increase reaction rate?
More particles in given area means that particles will collide more often.
How does decreasing particle size of a solid increase reaction rate?
Collision take place on the surface and the surface area is increased by decreasing particle size