Electrolysis
Energy Changes
Variables & Graphs
Chemical Calculations
General Knowledge
100
What is electrolysis?
Splitting up an ionic compound using electricity
100
The measured temperature change of a reaction were as follows: +20C, +24C, and +16C. What is the average temperature change?
+20C
100
What is the dependent variable?
What you observe or measure
100
Name 2 of the 3 subatomic particles
neutrons, protons, and electrons
100
Which scientist famously had an apple fall on his head?
Sir Isaac Newton
200
The Anode and Cathode are charged electrodes. Which is positively charged, and which is negatively charged?
Anode - positively charged electrode
Cathode - negatively charged electrode
200
How can we tell a reaction is exothermic?
Temperature increase
200
What is the independent variable?
The thing you decide to change in an experiment
200
Hydrogen has the symbol 11H and Oxygen has the symbol 168O.
What is the relative formula mass of water, H2O?
18
200
What do scientists use for information on elements?
The Periodic Table
300
Give a typical example of an giant ionic lattice.
Salt (NaCl)
300
How can we tell a reaction is endothermic?
Temperature decrease
300
What is a control variable?
Things you keep the same to create a fair test
300
What is the equation for calculating concentration? (Include units)
Concentration (g/dm3) = mass of solute (g) / volume of solvent (dm3)
300
Which famous scientist was told by one of his teachers that "it doesn't matter what he does, he will never amount to anything"?
Albert Einstein
400
How does OILRIG relate to electrons?
Oxidation Is Loss, Reduction Is Gain of electrons
400
Give two advantages of repeating an investigation.
1. able to calculate a mean
2. can remove anomalous results
400
Which variable goes on the x-axis?
Independent variable
400
How does the mass of the products compare with the mass of the reactants in any reaction?
Mass is conserved. (Stays the same)
400
Who was the first person to win two Nobel Prizes?
Marie Curie (Physics 1903, Chemistry 1911)
500
Balance the following equation:
2 Al2O3 -> ___Al + ___O2
2 Al2O3 → 4 Al + 3 O2
500
What is activation energy?
the minimum energy needed for a reaction to take place
500
When do we use bar graphs?
When comparing different groups
500
What are the four steps involved in calculating relative formula mass (RFM)?
1. Identify the elements
2. How many atoms of each element
3. Consult Periodic table/Note relative atomic mass
4. Calculate RFM
500
List the 8 planets in our solar system.
