Download Section 416-A: Multiple Choices

Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
Section 1: Circle the correct answer:
1.
Several models have been developed to represent matter. The following
information relates to two of these models.
Model 1:
Matter is continuous. Everything is made from four elements: water,
fire, air and earth.
Model 2:
Matter is composed of atoms. The nucleus is positively charged
and electrons float around this nucleus.
To which scientists are these models associated?
a) The first with Democritus and the second with Rutherford
b) The first with Democritus and the second with Rutherford and Bohr
c) The first with Aristotle and the second with Rutherford
d) The first with Aristotle and the second with Rutherford and Bohr
Science and Technology 444
2.
QUIZ Chapters 1 and 2
Name: ______________________
In the laboratory, Christian performs experiments on two pure substances
provided to him. He records the following observations:
Substance 1
Characteristic
Before Heating
After Heating to 400°C
Conductivity
none
none
Colour
white
white
Form
powder
granular
Magnetism
none
none
Mass
15.25 g
13.50 g
Solubility in water
yes
no
Note. A gas is released upon heating; this gas has a characteristic
odour and is brownish in colour.
Substance 2
Characteristic
Before Heating
After Heating to 400°C
Conductivity
good
good
Colour
grey
grey
Form
rectangular
round
Magnetism
none
none
Mass
22.60 g
22.60 g
Density
11.40 g/cm3
11.40 g/cm3
Solubility in water
none
none
With the help of these notes, Christian has to describe each of these two
substances in terms of an element or a compound.
Which statement best corresponds to the descriptions that Christian should give?
a) Substance 1 is a compound; substance 2 could be a compound or an element.
b) Substance 1 is an element; substance 2 is a compound.
c) Substance 1 could be a compound or an element; substance 2 could be a
compound or an element.
d) Substance 1 could be a compound or an element; substance 2 is an element.
Science and Technology 444
3.
QUIZ Chapters 1 and 2
Name: ______________________
Which element is correctly associated?
a) Mercury
Mc
b) Iron
Ir
c) Phosphorous
P
d) Sodium
So
H. Brand discovers
Phosphorous.
4.
In the following periodic table, three elements are selected for research. The first
element reacts violently with water to produce a base, another belongs to the
noble gases and the third is a metalloid.
W X
Y Z
U
Which elements are they?
a) W, U, X
b) W, Z and U
c) X, Y and Z
d) W, X and Z
Science and Technology 444
5.
QUIZ Chapters 1 and 2
Name: ______________________
Which of the following is a characteristic common to both the Thomson and the
Rutherford models of the atom?
a) The atom is made up of positive and negative charges.
b) The negative charges are evenly distributed throughout the atom.
c) The electrons revolve around the nucleus.
d) The nucleus of atoms is made up of protons and neutrons.
6.
Throughout time, the model of the atom has changed considerably.
Thomson and Rutherford were scientists worthy of particular attention.
Match the atomic model characteristics given below with the appropriate scientist.
Scientist
Atomic Model Diagram
Atomic Model Description
1- Thomson
I- The atom is a positive sphere in
which
negatively
a-
charged
electrons are embedded like
e
raisins in a pudding.
2- Rutherford
II- The atom is made of a positively
charged
nucleus
that
is
encircled by electrons.
3- Bohr
III- The nucleus contains neutrons
b+
+ + +
+
c-
and protons. Electrons revolve
around the nucleus on energy
levels.
a)
1- I - b
2- III – a
3- II - c
b)
1- III - a
2- II – c
3- I - b
c)
1- I - b
1- II - c
2- II – c
2- III – a
3- III -a
3- I - b
d)
e
++
+++
+
+
n+n
n+n
e
Science and Technology 444
7.
QUIZ Chapters 1 and 2
Name: ______________________
What number of neutrons would an atom have knowing that it contains 24
protons, 24 electrons and a mass of 52 u?
a) 24
b) 26
c) 28
d) 48
8.
What characterizes isotopes of the same element?
a) Same mass number but different atomic number
b) Same atomic number but has a different mass number
c) Same atomic mass but different atomic number
d) Same atomic mass but a different mass number
9.
Which of the following best represents the phosphorous (P) atom according to the
Rutherford-Bohr model?
a)A)
c)
C)
+
+
27pp+
31
14 nn00
13
14pp+
15
0
16
13nn 0
22e-é¯ 88 é¯
e- 17
21é¯
e-
b)
B)
33eé¯
88é¯e- 3 4é¯e-
d)
D)
+
+
13pp+
15
16
27nn00
13pp+
15
14nn0 0
16
34 é¯
32eé¯
e- 88é¯
e-
22 é¯
e- 88é¯
e- 3 5é¯e-
Science and Technology 444
10.
You have seven protons
You have seven neutrons
You are a halogen
You group number is VI
How do atoms acquire the electronic configuration of their closest inert gas?
a)
b)
c)
d)
12.
Name: ______________________
For a given element, a valence electrons of seven means that:
a)
b)
c)
d)
11.
QUIZ Chapters 1 and 2
Those of group VIIA gain two electrons
Those of group VA lose one electron
Those of group IA gain two electron
Those of group IIIA lose three electrons
In the following equation:
2 As + 6 NaOH ---> 2 Na3AsO3 + 3 H2
What does the coefficient six indicate?
a)
b)
c)
d)
The presence of 6 sodium atoms
A grouping of 6 sodium, oxygen and hydrogen atoms
The presence of isotope 6 of sodium hydroxide (NaOH)
The number of valence electrons of sodium
Science and Technology 444
13.
QUIZ Chapters 1 and 2
Name: ______________________
The histogram below shows the distribution of the melting points of elements
within the first four periods of the periodic table.
Melting Point in Relation to Atomic Number
Period 1
Period 2
Period 3
Period 4
4400
4000
Melting Point (°C)
3600
3200
2800
2400
2000
1600
1200
800
400
0
-400
He
H
Be
Li
C
B
O
N
F
Ne Mg Si
S
Ar Ca Ti Cr Fe Ni Zn Ge Se Kr
Na Al P
Cl K Sc V Mn Co Cu Ga As Br
What pattern can be observed for the melting points?
a)
The melting points increase regularly among the alkali metals.
b)
The melting points increase regularly among the alkaline earth metals.
c)
The melting points increase among the halogens.
d)
The melting points decrease regularly among the metals across period 4.
Science and Technology 444
14.
Diiodine monocarbon
Carbon diiodide
Carbon diiodine
Carbon tetraiodide
What is the molecular formula of dinitorgen trisulphide?
a)
b)
c)
d)
17.
Aluminium sulphide
Sulphur aluminide
Dialuminium sulphide
Dialuminium trisulphide
What is the name of the following molecular formula CI4?
a)
b)
c)
d)
16.
Name: ______________________
What is the name of the following molecular formula Al2S3?
a)
b)
c)
d)
15.
QUIZ Chapters 1 and 2
N2S3
N3S2
NS
N2(SO4)3
What molecular formula do you get if you combine aluminium and arsenic?
a)
b)
c)
d)
AlAs
Al3As3
AlAs3
Al3As
Science and Technology 444
18.
QUIZ Chapters 1 and 2
Name: ______________________
The diagram below shows the paths of alpha (α), beta (β) and gamma
rays (γ) emitted from a radioactive source during an experiment on radioactivity.
Positively
charged
plate
Radioactive
source
Fluorescent
screen
β
+
γ
Negatively
charged
plate
α
Fluorescent
screen
What conclusion can be made from this experiment?
a)
The alpha particles and gamma rays have opposite charges.
b)
The alpha and beta particles have electrical charges.
c)
The alpha and beta particles and gamma rays each have different masses.
d)
The alpha and beta particles and gamma rays have the ability to pass
through matter.
Science and Technology 444
19.
QUIZ Chapters 1 and 2
Name: ______________________
Becquerel’s discovery of radioactivity led to an understanding of the properties
and structure of matter.
Which of the following statements best describes radioactive decay?
a)
Radioactive substances can emit neutral alpha particles, negatively charged
beta particles, or positively charged gamma rays.
b)
Radioactive substances can emit negatively charged alpha particles, neutral
beta particles, or positively charged gamma rays.
c)
Radioactive substances can emit positively charged alpha particles, neutral
beta particles, or negatively charged gamma rays.
d)
Radioactive substances can emit positively charged alpha particles,
negatively charged beta particles, or neutral gamma rays.
20.
What is an ion?
a)
b)
c)
d)
21.
A cathode ray
A charged atom
An element
An electric charge
Rutherford modified the atomic model after doing experiments where alpha
particles were dispersed by a sheet of gold foil. Consider the following
statements:
1. The number of protons equals the number of electrons.
2. Protons are concentrated in a small positive space at the center of the atom.
3. Atoms consist mostly of empty space.
4. Electrons are contained in a positive sphere made up of protons.
5. Electrons move about in specific energy levels (shells).
Which of these statements are based on Rutherford's experiments?
a) 1 and 2
c) 2 and 3
b) 1 and 4
d) 3 and 5
Science and Technology 444
22.
QUIZ Chapters 1 and 2
Name: ______________________
Element «X» has two isotopes.
Isotope
Mass number
Atomic number
I
64
30
II
66
30
The isotope with 34 neutrons has an abundance of 30.9%.
What is the average atomic mass for this element?
23.
a)
29.00 
b)
30.00 
c)
65.38 
d)
64.38 
Element X has three stable isotopes and an atomic number of 10.
Isotope
Number of Neutrons
Relative
(%)
1
10
95.92
2
11
0.26
3
12
?
abundance
Which of the following represents the atomic mass of element X?
a)
10.0 μ
b)
20.0 μ
c)
20.1 μ
d)
20.8 μ
Science and Technology 444
24.
Name: ______________________
Which molecular formula is improbable (not possible)?
a)
b)
c)
d)
25.
QUIZ Chapters 1 and 2
KCl
SiO2
Mg2I
FrBr
The atomic number of potassium, K, is 19 and its mass number is 39.
Which of the following diagrams correctly represents the simplified atomic model
(Rutherford-Bohr) of a potassium atom?
A)
C)
19 p+
19 n°
19 p+
39 n°
2e-
8e- 8e- 1e-
B)
2e-
8e- 8e- 1e-
2e-
8e- 8e- 1e-
D)
19 p+
20 n°
20 p+
39 n°
2e-
8e- 8e- 1e-
Science and Technology 444
26.
QUIZ Chapters 1 and 2
Name: ______________________
Which of the following illustrations corresponds to the simplified atomic model of a
fluorine (F) atom?
a)
c)
10 p +
9n 0
10 p +
9n 0
2e
8e
b)
2e
7e
2e
7e
d)
9p +
10 n 0
9 p+
10 n 0
2e
8e
Science and Technology 444
27.
QUIZ Chapters 1 and 2
Name: ______________________
After conducting an experiment involving cathode ray tubes, a student concluded
that cathode rays consist of negatively charged particles.
Which one of the following results supports this conclusion?
A)
a)
The cathode rays travel in a straight
line.
B)
b)
The cathode rays are deflected
towards the positively charged plate.
C)
c)
The cathode rays drive a small
propeller located in their path.
D)
d)
The cathode rays are deflected by
the magnetic field of a magnet.
magnet
Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
Section 2: Development:
(Be clear and precise in your explanations, your work must be organized)
28.
Three different substances were heated separately in crucibles. The
following observations were noted during the experiments:
Experiment 1:
• Before heating
The substance is a yellow solid with a mass of 100 g.
• After heating
The substance is a silvery liquid with a mass of 92.6 g;
oxygen was released during the heating.
Experiment 2:
• Before heating
The substance is a silvery solid with a mass of 150 g.
• After heating
The substance is a silvery solid with a mass of 150 g.
Experiment 3:
• Before heating
The substance is a silvery solid with a mass of 50 g.
• After heating
The substance is a white solid with a mass of 83.3 g.
From which experiment can one conclude that the original substance was a
compound? Justify your answer by giving two reasons (one word each).
Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
29.
Name the experiment that brought changes to Thomson’s model to create
Rutherford’s model?
30.
Name three properties of halogens.
31.
What is the name of group VIIIA?
32.
Draw the Newton-Lewis diagram for the following atoms:
a. Calcium
b. Nitrogen
c. Arsenic
d. Krypton
e. Germanium
Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
33.
Draw the electronic configuration, in detail, of the selenium atom.
34.
Name the following molecules using the binary compound rules of naming.
35.
a. PO2
___________________________________________________
b. As2S3
___________________________________________________
c. CaF2
___________________________________________________
d. I2S6
___________________________________________________
e. AlBr3
___________________________________________________
Write the molecular formula of the binary compounds when combining the
following atoms using the Crossover Rule.
a. Aluminium and Iodine
___________________________________________________
b. Strontium and Bromine
___________________________________________________
c. Thallium and Sulphur
___________________________________________________
d. Rubidium and Chlorine
___________________________________________________
e. Phosphorous and Sulphur
___________________________________________________
Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
36.
Describe the organization of the modern periodic table. Full marks are allotted to
a detailed description of trends and other characteristic properties of the principal
chemical groups. Mention three trends.
38.
Show the molecule formed by Bromine and Gallium using the Newton-Lewis
diagram according to the octet rule.
39.
Part 1:
What will be the molecular formula of the compounds formed by the following
atoms using the Crossover Rule?
a)
K
&
S
___________________________________________________
b)
Ca
&
Se
___________________________________________________
c)
In
&
Se
___________________________________________________
d)
Ba
&
P
___________________________________________________
e)
Cs
&
O
___________________________________________________
f)
Si
&
I
___________________________________________________
Science and Technology 444
QUIZ Chapters 1 and 2
Name: ______________________
Part 2:
What is the Newton-Lewis diagram of the compounds formed by the following
atoms?
40.
a)
O
&
O
___________________________________________________
b)
Si
&
S
___________________________________________________
c)
Ca
&
F
___________________________________________________
d)
Al
&
Cl
___________________________________________________
Aluminium reacts with calcium oxide to form aluminium oxide and calcium
powder.
a. Using the crossover method for bonding, draw the molecular formulae for
calcium oxide and aluminium oxide.
b. Write the equation that describes this reaction that involves pluses and an
arrow.
_________________ + _________________ _____________+_____________