Rate of reaction
Atomic Structure
Bonding and Structure
Energy Changes
100
What is meant by the rate of a chemical reaction?
The time taken for products to get made or reactants to get used up
100
Which term describes a molecule that contains two or more elements chemically combined in fixed proportions? 
Compound
100
Chemical bonding happens because all atoms are more stable if they have a ______ outer shell
full
100
What kind of reaction releases energy to the surroundings?
Exothermic
200
What are the four factors that affect the rate of reaction?
1. Temperature
2. Concentration/pressure
3. Surface area
4. Presence of a catalyst
200
Distillation can be used to separate substances in a solution due to a difference in their ________ points.
boiling
200
Metals ________ electrons, while non-metals ___________ electrons
lose, gain
200
What kind of reaction causes a temperature increase?
Exothermic
300
Calculate the mean rate at 40 degrees C
31
300
What is the symbol for hydrogen?
H
300
What charge does a sodium ion have? Sodium is a metal in group 1
+1
300
What is the missing label for this energy profile diagram?
Activation energy
400
Explain how surface area affects the rate of reaction
The greater the surface area, the more particles are available to react at a given time. This leads to more frequent successful collisions
400
How many electrons can each electron shell hold?
2 electrons on the first shell; 8 electrons on the second shell; 8 electrons on the third shell
400
What charge does a fluoride ion have? Fluorine is a non-metal in group 7
-1
400
Describe what is meant by activation energy
The minimum energy with which particles need to collide to cause a reaction
500
Why might the apparatus shown result in inaccurate readings for the volume of gas produced?
Delivery tube is not directly in the measuring cylinder, so some gas will not be collected
500
How many protons are in an atom of calcium?
20
500
What is the formula of sodium fluoride? Sodium ions have a charge of +1, while fluoride has a charge of -1
NaF
500
What is the independent variable in this experiment?
Volume of hydrochloric acid