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WorksheetsGrade 12 - Science Semi Finals
Total questions: 15
Worksheet time: 8mins
Easy: In balancing chemical equations which of the following can be changed?
Subscripts
Coefficients
Chemical formulas
Chemical symbols
Easy: What were the first two elements to form once the universe expanded and cooled?
Helium and Oxygen
Carbon and Helium
Hydrogen and Oxygen
Hydrogen and Helium
Easy: Which of the following does not form hydrogen bonds?
H2S
H2O
NH3
HF
Easy: What does a catalyst do to a chemical reaction?
Stops the reaction
Starts the reaction
Speeds up the rate of reaction
Slows down the rate of reaction
Easy: A nucleotide is consisting of_________
Base and Sugar
Sugar and Phosphate
Base and Phosphate
Base, Sugar, and Phosphate
Advance: How do gas particles respond to an increase in volume?
increase in temperature and decrease in pressure
decrease in kinetic energy and decrease in pressure
increase in kinetic energy and increase in temperature
increase in kinetic energy and decrease in temperature
Advance: An unknown gas is held at constant pressure and a number of moles. What will happen to the volume if one decreases the temperature of the gas?
it will increase
it will be doubled
it will decrease
it will remain the same
Advance: Which of the following is not correctly paired in relation to reflex reactions?
nausea : smelling a nasty odor
blinking : an insect is flying towards your eye
salivation : smelling the aroma of your favorite food
pupils get bigger : seeing a bright light shining in your eye
Advance: Which of the following pair of phase changes is in dynamic equilibrium at the boiling point?
Condensation and Evaporation
Melting and Freezing
Sublimation and Deposition
Condensation and Fusion
Advance: Which of the following statements is TRUE?
Only temperature affects the state of matter.
Only intermolecular forces affect the state of matter.
Both temperature and intermolecular forces affect the state of matter.
Neither temperature nor intermolecular forces affect the state of matter.
Difficult: The 4 priority areas which correspond to the structure of the National Risk Reduction Management Council ( NDRRMC) include the following except:
Disaster response
Disaster preparedness
Detection and response
Disaster prevention and mitigation
Difficult: Water molecule has ____ single bonds, _____ double bonds, _____ triple bonds and _______ lone pairs?
2, 2, 0, 0
0, 0, 2, 2
2, 0, 2, 0
2, 0, 0, 2
Base on the graph, which is the best estimate of the normal boiling point of ethanol?
45 degree Celsius
65 degree Celsius
77 degree Celsius
100 degree Celsius
Difficult: The phase diagram of CO2 is provided below. Suppose you have a sample containing CO2 (g) and CO2 (s) at equilibrium at –78 ºC and 1 atm. What will happen if the sample is heated to –30 ºC when the pressure is increased to 12 atm?
The melting point of CO2 will decrease.
At equilibrium, only CO2 (g) is present.
All CO2 will be converted to its liquid form.
At equilibrium, CO2(g) and CO2(l) are both present.
Difficult: Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of radioactive elements radium and polonium?
(a)
