Download bluevale collegiate institute

PRACTICE FINAL EXAM - SNC1DI
Chemistry Unit
Student Name: __________________________
(print clearly)
Part A: Multiple Choice/True or False (40 Marks)
Circle the best answer.
1.
During a physical change …
A) new substances are produced.
B) the particles are not changed.
C) heat is always released.
D) the products have different chemical properties from the reactants.
2.
A solution may be classified as a …
A) homogeneous pure substance.
B) solute and solvent chemically combined.
C) homogenous mixture with particles too small to be seen.
D) heterogeneous pure substance.
3.
Which list is in order of increasing complexity of substances?
A) molecule, mixture, atom
C) atom, mixture, molecule
B) atom, molecule, mixture
D) mixture, molecule, atom
4.
Elements in the same horizontal row on the periodic table...
A) are members of the same family.
C) have the same number of electron shells
B) have the same number of outer shell electrons.
D) have similar chemical properties.
5.
If a lighted splint is placed in a sample of hydrogen, the splint will go out.
A) True
B) False
6.
When water is decomposed (dissociated) by electrolysis, there is twice as much hydrogen gas
produced as there is oxygen gas.
A) True
B) False
7.
A theory is an explanation; a hypothesis is a prediction.
A) True
B) False
8.
The symbols for calcium, carbon, and chlorine are Ca, C, and Cl, respectively.
A) True
B) False
9.
The formula for a compound represents . . .
A) the number of neutrons contained in the nucleus.
B) the type of elements present.
10. Electrons are . . .
A) of relatively low mass and positive in charge.
B) heavy nuclear particles.
11.
The
A)
B)
C)
D)
C)
D)
metals and non-metals
the ratio of atoms present in the compound
C)
D)
of relatively high mass and negatively charged.
of relatively low mass and negatively charged.
number of neutrons in an atom may be calculated by using the formula:
number of neutrons = mass number + atomic number
number of neutrons = mass number - atomic number
number of neutrons = atomic number - mass number
number of neutrons = mass number
12. Which of the following statements best describes the structure of an atom?
A) A positively charged nucleus, consisting of protons and neutrons, orbited by electrons.
B) Electrons and protons within the nucleus, orbited by neutrons.
C) A dense, positively charged nucleus, orbited by protons and electrons.
D) Negatively charged protons and neutrons in the nucleus, orbited by electrons.
13. An object is found to have a charge of positive three on it. This means it . . .
A) gained three electrons
C) gained three protons
B) lost three electrons
D) lost three protons
Part C: Short Answers
2.
a)
What two conclusions did Rutherford make based on the following observations?
Almost all the high-speed alpha particles passed through gold foil without changing course.
A few (1/20 000) alpha particles bounced straight back when fired at a gold foil
[2]
b)
What was the problem with Rutherford’s model? Who fixed this problem?
Draw a diagram of this new model.
[2]
Part D: Numerical Problems (15 Marks)
Answer the questions below in the space provided. Show all your work and be careful to include correct
units.
4.
An empty container has a mass of 1245 g. When it is filled with 2.50 L of liquid it has a mass
of 4395 g. Would an object of density 1.7 g/mL float or sink in the liquid?
2