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WorksheetsChemistry 10 Pre Assessment
Total questions: 69
Worksheet time: 1hrs 8mins
Name
Class
Date
1.
How many independent variables can be tested in a controlled experiment?
a)
one
b)
two
c)
three
d)
as many as possible
2.
What is the group in an experiment that receives treatment with the independent variable?
a)
control group
b)
experimental group
c)
constant group
d)
variation group
3.
Which type of graph shows the differences between groups?
a)
Bar
b)
Pie
4.
When writing your hypothesis, what information follows IF?
a)
dependent variable
b)
how you know it will happen
c)
independent variable
d)
anything
5.
This variable in an experiment is the one being deliberately changed by the scientist.
a)
dependent variable
b)
independent variable
c)
data
d)
control group
6.
What step does every scientific experiment begin with?
a)
hypothesis
b)
question/problem
c)
procedures
d)
conclusion
7.
Type of graph that shows changes in quantities over time and distance.
a)
line graph
b)
pie graph
c)
bar graph
8.
What are compounds?
a)
Substances made of one or more types of elements.
b)
Substances made of one or more types of neutrons.
c)
Substances made of one or more types of nuclei.
d)
Substances made of one or more type of electron.
9.
What is a pure substance?
a)
Protons Neutrons and Electrons.
b)
Particles that collide.
c)
Substance that can be separated by physical means.
d)
Substance that cannot be separated by physical means.
10.
What is an atom made of?
a)
Subatomic elements
b)
Protons Neutrons and Electrons
c)
Microscopic Particles
d)
Positive Negative Neutral
11.
What is the charge of a neutron?
a)
Positive
b)
Negative
c)
Neutral
12.
What is the atomic number of Carbon?
a)
6
b)
12.0107
c)
C
d)
Carbon
13.
Which of the follow are NOT physical properties?
a)
Color
b)
Flammability
c)
State of Matter
d)
Taste
14.
Solubility is
a)
an items ability to dissolve
b)
an items ability to melt
c)
an items ability to freeze
d)
an items ability to boil
15.
The States of Matter are:
a)
Solid Liquid Grass
b)
Solid Liquid Gasp
c)
Solid Liquid Gap
d)
Solid Liquid Gas
16.
Chemical properties are the way a substance
a)
restarts
b)
reacts
c)
renews
d)
reviews
17.
What is the smallest unit of matter?
a)
Element
b)
Atom
c)
Molecule
d)
Compound
18.
Which one is NOT a compound?
a)
H2O
b)
CO2
c)
NaCl
d)
Ne
19.
I am anything that has mass and takes up space!
a)
energy
b)
matter
c)
molecules
d)
atoms
20.
A change in the form of a substance that does not change its identity?
a)
Physical Change
b)
Malleability
c)
Soluability
d)
Density
21.
The relationship between mass and volume?
a)
Volume
b)
Density
c)
weight
22.
Characteristic that can be observed or measure such as color, state, or hardness?
a)
Physical Change
b)
Physical Property
c)
Solubility
23.
Which of the following is not an example of physical Change?
a)
Shaping of a gold bar
b)
explosion of fireworks
c)
sanding a piece of wood
d)
melting of popsicle
24.
What is the best way to tell if a chemical change has taken place?
a)
The matter changes color
b)
The change is reversible
c)
The mixture separates into layers
d)
The composition changes
25.
The tool used to measure the mass of a substance or object is a ______________.
a)
balance
b)
graduated cylinder
c)
ruler
d)
thermometer
26.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
27.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
28.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1,
d)
4, 3, 1, 2
29.
Which box has a higher density?
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
30.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
31.
How many protons does an atom of Nitrogen have?
a)
14
b)
7
c)
15
d)
18
32.
Which of the following is a negatively charged subatomic particle?
a)
Electron
b)
Proton
c)
Neutron
d)
Quark
33.
How many neutrons are in an atom of Beryllium?
a)
4
b)
9
c)
9.01
d)
5
34.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
35.
Which is the correct formula for:
three hydrogen (H)
one sulfur (S)
four oxygen (O)
three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
36.
How many total atoms are in 2Cu(SO4)2?
a)
12
b)
16
c)
20
d)
22
37.
How many atoms of Oxygen (O) are in 2Cu(SO4)2?
a)
8
b)
12
c)
16
d)
20
38.
What is the mole used for?
a)
To measure the amount of grams in a substance
b)
To measure the amount of atoms or molecules in a substance
c)
To measure the amount of energy in a substance
d)
To measure the amount of bonding in a substance
39.
What is Avogadro's Number?
a)
6.02 x 1023
b)
- 6.02 1023
c)
6.02 x 1022
d)
6,020,000,000,000
40.
A mole of Neon contains
6.02 x 1023 _____.
6.02 x 1023 _____.
a)
atoms
b)
formula units
c)
ions
d)
molecules
41.
Calculating percent composition determines the ___________ of each atom in a compound
a)
percent by mass
b)
percent by volume
c)
percent by number
42.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
43.
In this image, what are the information to the right of the arrow (in black) is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
44.
What is the empirical formula for the following molecular formula: C6H14
a)
C6H14
b)
C3H7
c)
CH2
d)
CH3
45.
What is the empirical formula for the following molecular formula: C5H12
a)
C5H12
b)
CH3
c)
CH2
d)
C2.5H6
46.
The law of conservation of mass states that....
a)
Matter can be made
b)
Matter can be destroyed
c)
Matter can neither be made or destroyed
47.
You mix lemon juice and baking soda. The temperature drops on the thermometer. This is a ______reaction.
a)
Exothermic
b)
Endothermic
c)
Ionic
48.
Is this balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
NO!
49.
Balance this equation...
HgO --> 2Hg + O2
HgO --> 2Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
50.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO
N2+O2--> _NO
a)
1
b)
2
c)
3
d)
4
51.
Which of these substances is acidic?
a)
tap water
b)
lemon
c)
ammonia
d)
baking soda
52.
How is a standard hydrogen atom different from a hydrogen ion?
a)
a hydrogen ion has an extra electron.
b)
a hydrogen ion is missing an electron.
c)
a hydrogen ion has an extra proton.
d)
a hydrogen ion is missing a proton.
53.
What might happen if you mixed a strong acid with an equally strong base?
a)
You would see an explosive chemical reaction.
b)
The acid would destroy the base.
c)
The base would destroy the acid.
d)
You'd wind up with a pH-neutral substance.
54.
An extremely strong base would have a pH of:
a)
1
b)
7
c)
9
d)
14
55.
Healthy environments for life have a pH closest to:
a)
1
b)
3
c)
7
d)
10
56.
A beaker contains a mixture of a sand and small pebbles. What kind of mixture is this?
a)
Homogeneous
b)
Solution
c)
Heterogeneous
d)
Compound
57.
How many grams of K2Cr2O7, are soluble in 100 g of water at 95 ºC?
a)
83 grams
b)
75 grams
c)
40 grams
d)
12 grams
58.
Which substance is MOST soluble at 0 ºC?
a)
KI
b)
NaNO3
c)
NaCl
d)
Ce2(SO4)3
59.
Which substance is reduced in the following reaction?
NaOH + Li --> LiOH + Na
NaOH + Li --> LiOH + Na
a)
Li
b)
Na
c)
O
d)
H
60.
If in a reaction, copper is reduced; its number of electrons has:
a)
Increased
b)
Decreased
c)
Remained Constant
d)
Varies Randomly
61.
If an atom loses electrons during a chemical reaction, the atom was:
a)
Oxidized
b)
Reduced
c)
Neutralized
d)
Precipitated
62.
True or False - Elements in the same group have similar chemical properties.
a)
True
b)
False
63.
The electron configuration of an atom is 1s22s22p6. The number of electrons in the atom is
a)
3
b)
6
c)
8
d)
10
64.
Ionic Bonds form between two ions that have
a)
ionic compounds
b)
negative charges
c)
positive charges
d)
opposite charges
65.
Ions that are made of more than one atom bonded covalently are called
a)
ionic compounds
b)
crystals
c)
polyatomic atoms
d)
ionic bonds
66.
Nonmetals are most likely to _____________ valence electrons in order to have a stable arrangement.
a)
lose
b)
gain
c)
gain or share
d)
share
67.
Which of the following is NOT a polyatomic ion?
a)
NH4+
b)
HCO3-
c)
Ca2+
d)
SO42-
68.
How many are shared in a double bond?
a)
2
b)
4 pairs
c)
6
d)
4
69.
When a metal reacts with a nonmental, it makes
a)
an ionic compound
b)
a covalent compound
c)
a low melting point
d)
water molecules
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