Science 10 IB Exam Review
1)
How many neutrons does a
27
15
Si contain?
a. 12
b. 27
c. 15
d. 42
How many oxygen atoms are present if there are 4 zinc phosphate molecules?
a. 8
b. 32
c. 4
d. 16
3) In a ____________ reaction there is one reactant.
a. Combustion
b. single displacement
c. decomposition d. formation
4) Which two elements could NOT displace each other in a reaction?
a. Fe and Cu
b. Be and F
c. Na and Ca
d. Li and Ni
5) How many valence electrons does P2- have?
a. 5
b. 8
c. 7
c.6
6) In the ion, Cr6+, the chromium atom has:
a.
gained 6 electrons
b. lost 6 protons c. gained 6 protons
d. lost 6 electrons
7) How many electrons does a zirconium atom contain in the fourth energy level?
a. 4
b. 18
c. 32
d. 10
8) The correct mass number for an atom of neon which has 10 protons, 10 electrons, and 12 neutrons is:
a. 12
b. 10
c. 22
d. 20
9) Which of the following is an ionic compound?
a. F2
b. CO2
c. CaF2
d. CH2O
10) Which two species have the same number of valence electrons?
a. N3- & Ar
b. C & P c. Cl+ & Ne
d. N & Be
2)
1.
Complete the table by giving the formula or the name for the
following. (10 pts)
2.
a. Draw a Bohr model diagram for a gallium atom. (2 pts)
b. Draw the Lewis Structure or electron transfer diagram,
whichever is appropriate, for the compound formed between
sulfur and bromine atoms. (2 pts)
3.
Explain the charge on a chloride ion. (2 pts)
Name
trinitrogen heptoxide
copper (II) oxide
silicon tetracarbide
carbonic acid
sulphurous acid
Formula
Pb(NO3)4
CaI2
H2SO4(aq)
Cr(SO4)3
BCl5
4.
1.
2.
3.
4.
5.
The following is a nonsense reaction. D +E3G2 -----> ?????
Elements E and G are diatomic. E has a charge of 4+ and D has a charge of 1+.
a) What is the charge on G? Explain how you know. (2 pts)
b) What is the balanced equation? (3 pts)
c) Is element D diatomic? Explain how you know. (2 pts)
d) What type of reaction is this? (1 pt)
5. For each word equation, give the balanced equation and the type of reaction it is and if it is exothermic or endothermic. (3 pts each)
a) Sodium reacts explosively with water to produce sodium hydroxide and hydrogen gas.
b) Magnesium oxide reacts with carbon dioxide to form magnesium carbonate and heat.
c) Copper (II) sulfate reacts with solid nickel to produce nickel (II) sulfate and copper metal. After the reaction the test tube is cold to
the touch.
d) Butane (C4H10) reacts with oxygen to produce carbon monoxide and water vapour.
6. Predict the products and write the balanced equation for each of the following reactions. (5 pts each)
a) Propane (C3H8) is burned (completely).
b) Barium hydroxide reacts with chlorous acid.
c) Zinc metal is placed in nitric acid.
d) Iron (III) bromide reacts with barium hydroxide to form a precipitate.
e) Magnesium reacts with aluminum sulfate.
7. The following are balanced ionic compounds with ions that we’ve never seen before. Find the charge on each of these new ions. (3 pts)
a. Ca(HSO4)2
Charge on HSO4 ___________
b. Li2(S2O3)
Charge on S2O3 ___________
a. (H3O)3P
Charge on H3O ___________
8. Write the reactants of a single displacement reaction which will not occur. (2 pts)
What is the molar mass, in g/mol, of xenon hexafluoride?
a. 806.8
b. 245.3 c. 108
d. 264.3
How many oxygen atoms are in a chromium (VI) nitrite molecule?
a. 2
b. 6
c. 12
d. 3
Two white solids are mixed in a beaker and a reaction occurs. The beaker is cold to the touch. It can be said that this reaction is
a. endothermic
b. exothermic
c. neutralization
d. precipitation
Hydrocyanic acid reacts with calcium hydroxide to form what compounds?
a. H2O and Ca(OCN)2
b. HOCN and Ca(OH)2
c. H2O and Ca(CN)2
d. HCN and Ca(OH)2
The reaction in question #4 is of what type?
a. single replacement
b. formation
c. double replacement
d. decomposition
6. For each reaction described below, state the balanced chemical equation. (3 pts each)
AsO33- arsenite
a. A solution of lead (II) nitrate is mixed with a solution of sodium iodide.
P2O74- pyrophosphate
b.Magnesium arsenite reacts with lithium aluminate.
AlO2- aluminate
c. Liquid butane (C4H10) undergoes complete combustion.
d.Barium hydroxide solution is added to hydrobromic acid.
e.A piece of aluminum is placed in a beaker of sulfuric acid.
7. A solution of AsCl3 containing 0.87 moles of AsCl3 is used to create HCl via the following unbalanced equation. How many moles of HCl are
formed? (3 pts)
AsCl3 + H2S
 As2S3 + HCl
8.
149 g of potassium sulfate reacts with lot of barium chloride. How many moles of each product are formed? (5 pts)
9.
10.
11.
12.
13.
14.
15.
A sample of pyrophosphic acid contains 3.25 x 1024 molecules. What is the mass of this sample? (4 pts)
How many moles of methane gas are found in 125 L? (2 pts)
When a can of pop is opened, carbonic acid decomposes to water and carbon dioxide. If 0.60 moles of carbonic acid is decomposed, how many
moles of carbon dioxide are produced? (3 pts)
The chemical formula for Tylenol is C9H8O4. A sample of Tylenol is known to have 3.21 x 1022 oxygen atoms, what is the mass of the sample? (4
pts)
Plants create food through the chemical reaction called photosynthesis. The skeleton equation is shown below. If a plant is given 125 grams of
water and a large amount of carbon dioxide, how many moles of sugar (C6H12 O6) is produced? (4 pts) CO2 + H2O  C6H12 O6 + O2
A certain substance contains zinc and a polyatomic ion called bromate, BrO3. Mr. LeBlanc does not remember the charge on bromate. He does
know that the substance has a molar mass of 321.1 g/mol. What is the charge on the bromate ion? Be sure to explain your answer. (3 pts)
An object will float in another substance if its density is less than the density of the surrounding material. Density is defined as the object’s mass
divided by the volume it occupies. In this question we will find out if a balloon full of nitrogen gas will float in a room of oxygen.
a. A balloon is filled with nitrogen gas and has a volume of 12L. How many moles of nitrogen gas are in the balloon? (1 pt)
b. What is the mass of the nitrogen gas in the balloon? (2 pts)
c. Find the density of nitrogen. Remember: density is the mass divided by the volume. Its unit is g/L. (2 pts)
d. Now we need to find the density of oxygen. So find the mass of the oxygen gas in a 12 L balloon. (3 pts)
e. Will a balloon of nitrogen gas float in a room full of oxygen? (1 pt)
1.
Answer the following questions relating to the velocity-time graph shown below.
a.
b.
c.
d.
2.
a. What is the velocity of the object at t = 17s? (1 pt)
What is the acceleration of the object at t = 12s? (2 pts)
When is the object at rest? (4 pts)
What is the displacement of the object over the last 5.0 seconds?
When is the object traveling to the right? (Right = “+”) (2 pts)
Answer the following questions relating to the position-time graph shown below.
a. The graph is missing two sections. From t = 4.0 seconds to t = 8.0 seconds, the object sped up. At t = 24s to t = 25 s the object
moved at a constant velocity. Draw the missing parts of the graph.
b. What is the average velocity of the object for the first 25
seconds? (2 pts)
c. When is the object traveling to the right? (Right = “+”) (2 pts)
d. What is the position of the object at t = 19 s? (2 pts)
e. What is the velocity t = 2.0s? (2 pts)
3. One of Mr. LeBlanc’s students is waiting for him at extra help. He paces back and forth. He walks 1.2 m/s [right] for 2.3 seconds, then 1.8 m/s
[left] for 3.4 s, then 0.9 m/s [right] for 4.9 s.
a. Calculate his distance traveled. (3 pts)
b. Calculate his average velocity. (4 pts)
4. A cheetah can run up to 114 km/hr. A gazelle is standing 65 m away. How many seconds until the cheetah has lunch? Assume the gazelle
doesn’t move. (2 pts)
5. Calculate the average velocity. (3 pts)
6.
7.
To celebrate the upcoming holiday break, 4 Pre-IB students take a road trip. Their displacement is as follows: 56km [23° S of E], 28 km [W],
and then 48 km [64° N of E]. Calculate their displacement using the method of your choice. (6 pts)
Solve the following equation for the variable ‘c’. (2 pts)
sc
ru
 10 
i
les
8.
9.
Perform the operation indicated. Your answers must have the appropriate level of precision to receive any value. (2 pts)
a. 5.250 m / 0.045s
b. 78.2cm + 5.00cm + 98cm
The magnitudes of two displacement vectors are 7.0 m and 19.0m.
a. What is the smallest total displacement these two vectors can produce? (1 pt)
b. What is the largest total displacement these two vectors can produce? (1 pt)
c. If these two vectors are at a right (900) angle to each other, what is the magnitude of the resultant?
(1 pt)
Selected Response: Circle the letter corresponding to the best answer. (1 pt each)
1. An example of a primary consumer is a
a. dandelion
b. frog
c. robin d. cow
2. Which of the following can NOT part of the nitrogen cycle?
a. ammonia
b. carrots
c. carbonic acid
d. humans
3. Which process removes carbon dioxide from atmosphere?
a. Respiration
b. photosynthesis c. eutrophication d. remediation
4. Which process removes nitrogen from the atmosphere?
a. nitrification
b. photosynthesis c. denitrification
d. nitrogen fixation
5. Every food web needs
a. a producer
b. a tertiary consumer
c. a secondary consumer d. at least 4 trophic levels
6. Dry land cools __ than water.
a. slower
b. the same as water
c. faster d. dry land doesn't cool
7. Which of the following is an example of convection?
a. touching a hot rod
b. cold air returning to a furnace
c. feeling the sun’s warm rays
d. toasting bread
6. A certain substance has a specific heat capacity of 1.2 J/g0C. A 0.320 kg sample is heated so that its temperature changes by 8.9
0
C. The heat gained by the sample is
a. 3400 J
b. 3.4 J
c. 12 J
d. 1200 J
7. At 120C saturated air has 8.9 grams of water in 1.0 kg of air. If a box has 3.2kg of air in it and has a relative humidity of 82%,
how much water vapour is in the box?
a. 28g
b. 23g
c. 2.6 g
d. 7.3 g
8. Which situation takes less time?
a. 80 grams of milk cooling by 50 0C.
b. 80 grams of milk cooling by 25 0C
c. 70 grams of milk cooling by 25 0C
d. 70 grams of milk cooling by 500C
Constructed Response:
Answers the questions 1 - 8 by looking at the food web
above.
1. Give an example of an aquatic primary consumer.
(1 pt)
2. In which trophic level is the weasel. (1pt)
3. Which organism is an omnivore (an organism that
consumes both producers and other consumers)?
(2 pts)
4. State a food chain containing 6 trophic levels. (2
pts)
5. Suppose bacteria decrease the minnow
population. Explain how the water spider would
be affected. (3 pts)
6. If a toxin is introduced to the aquatic food web,
explain how the toxin could affect terrestrial
animals. (2 pts)
Draw a pyramid of numbers for the Grass  Rabbit  Snake  Wolf food chain. (2 pts)
We have seen the combustion of hydrocarbons emits CO2, a greenhouse gas, which absorbs some of the energy the Earth
radiates. Assume the Earth radiates 1.80 x 10 15 J in 30 days and that 0.05% of that is radiated into the lake due to the greenhouse
effect. The mass of the lake is estimated to be 5.70 x 10 10 g?
a. If all the energy the lake absorbs is used to heat the water, calculate the temperature change. (4 pts)
b. The average temperature of the lake is 15 °C. Studies show that is the temperature is greater than 18 °C, Crayfish are
unable to reproduce. If this scenario were to occur explain what would happen to the snakes. (3 pts)
9. The air in the atmosphere absorbs 16% of the incoming solar radiation. The specific heat capacity of the air is 1.02 J/g 0C. If 79
000J of solar radiation enters the atmosphere, what would the change in the 15 500 g of air temperature be? (3 pts)
10. A thermos contains 120g of hot water at a temperature of 82 0C. A 1500g piece of iron initially at a temperature of 21 0C is
placed in the thermos. What is the temperature of the iron when the water has dropped to 650C? Assume that all of the energy
the water lost is gained by the iron (cFe = 0.450 J/ g °C). (5 pts)
11. The temperature one day was a constant 180C. The relative humidity was 78%. During the night, the temperature dropped to
6.00C. Was dew formed on the ground the next morning? Show calculations to justify your answer. (Saturation points: 18 0C =
13.2 g and 6.0 0C = 5.9 g) (3 pts)
7.
8.