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Worksheets2020-2021 Chemistry Midterm Exam Review
Total questions: 67
Worksheet time: 34mins
When using a triple-beam balance you should measure the object to the nearest _____.
1 g
0.1 g
0.01 g
0.001 g
The least accurate of the volume measuring tools you might use in the lab is the _____.
100 ml graduated cylinder
50 ml graduated cylinder
Beaker
Burette
The correct way to read a volumetric device is from the ______.
Top of the meniscus
Bottom of the meniscus
Middle of the meniscus
Any of the above is fine
The best way to separate a dissolved solid from its solvent is ________.
Decanting
Evaporation
Filtration
All of the above
An insoluble solid can be separated from a liquid it is mixed with by _____.
Decanting
Decanting and evaporation
Decanting and filtering
Decanting is not used
When using a striker to light a Bunsen burner during lab, you are allowed to attempt to light a flame _____ times before needing to turn off the gas and waving the gas fumes away.
1
2
3
4
I have trouble seeing through my goggles during lab. It is ok for me to remove my goggles _____ to see what I am measuring.
Briefly
Never
Sometimes
Whenever needed
The best type of flame to use in lab is a ______ flame.
Double blue coned
Single blue coned
Flickering
Yellow
To mass out 10.0 g of a solid, crystalline chemical I must do the following:
Set the balance to 10.0 grams and add enough solid to the balance pan to bring the pointer back to zero.
Set the balance to 10.0 grams, use a weigh boat and add enough solid to the boat to bring the pointer back to zero.
Set a weigh boat on the balance pan and move the riders to 10.0 grams, then add enough chemical to bring the pointer back to zero.
Set a weigh boat on the balance pan and add 10.0 grams to the mass of the boat, then add enough chemical to bring the pointer back to zero.
When disposing of left-over chemicals and by-products of a lab you ____.
Rinse the unused portion down the drain and throw the by-product in the trash
Rinse both the unused portion and the by-product down the drain
Throw both the unused portion and the by-product down the drain
Throw both the unused portion and the by-product into the assigned disposals
When you calculate the average atomic mass of an isotope, the size of the sample will make a difference.
True
False
It depends on the isotope
We did not talk about this
Ions are two or more of the same element with different numbers of _____.
Electrons
Protons
Neutrons
Energy levels
What is the name of element number 18?
Fluorine
Argon
Noble gas
None of the above
What is the symbol for Beryllium?
B
Be
Br
By
Use the picture below to determine the mass number, atomic number and isotope name of the atom shown.
Mass # 5, Atomic # 5, Isotope name – Boron
Mass # 9, Atomic # 5, Isotope name – Boron
Mass # 5, Atomic # 9, Isotope name – Fluorine
Mass # 9, Atomic # 9, Isotope name – Fluorine
What unit do you measure the mass of a single atom in?
AMU’s
Grams
Kilograms
Moles
The mass number of an atom tells you the total number of _____.
Protons
Protons and electrons
Protons and neutrons
Protons, electrons and neutrons
The atomic number of an atom tells you the total number of _____.
Protons
Protons plus electrons
Protons plus neutrons
Protons, electrons plus neutrons
Isotopes are different types of atoms of the same element, but have different numbers of _____.
Protons
Electrons
Neutrons
Energy levels
Carbon-14 is an isotope used for radiometric dating. Tell how many protons, neutrons and electrons the neutral atom contains.
6 protons, 6 neutrons and 6 electrons
6 protons, 8 neutrons and 6 electrons
6 protons, 6 neutrons and 8 electrons
6 protons, 14 neutrons and 6 electrons
Read the measurement shown in the picture above.
1.53 cm
1.52 cm
15.32 cm
15.42 cm
Read the measurement shown in the picture above.
0.23 ml
0.25 ml
0.230 ml
0.250 ml
Read the measurement shown in the picture above.
480.50 g
480.55 g
4805.5 g
4800.5 g
The speed of light in a vacuum is 299,792,458 m/s. What is the speed of light given in correct scientific notation with two significant figures?
2.9 x 108 m/s
29 x 107 m/s
3.0 x 108 m/s
30 x 107 m/s
The radius of an argon atom is 0.000000000098 m. What is the radius of an argon atom given in correct scientific notation with three significant digits?
0.098 x 10-9 m
0.98 x 10-10 m
9.80 x 10-11 m
98.0 x 10-12 m
In lab you are asked to calculate the density of an unknown substance in order to identify it. This is an example of what type of lab?
Chemical analysis
Gravimetric analysis
Qualitative analysis
Quantitative analysis
You are asked to perform an experiment to determine which melts faster, salt or sugar. This is an example of what type of lab?
Chemical analysis
Gravimetric analysis
Qualitative analysis
Quantitative analysis
The density of water at 4 0C is 1.00 g/ml. Kayla experimentally found the density of water to be 1.082 g/ml. What is her percent error in the correct number of significant figures?
8.0 %
8.2 %
8.20 %
8.200 %
Josh uses his thermometer and finds the boiling point of ethyl alcohol to be 75.0 0C. He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 80.0 0C. What is his percent error in the correct number of significant figures?
6.25 %
6.3 %
6.67 %
6.7 %
A student measures the length of a line to be 15.85 cm. What is the range of her uncertainty?
+2.0
+0.2
+0.05
+0.005
The density of oxygen gas at STP (0.0 0C and 101.325kPa) is 0.00142 g/ml. What is the density of oxygen in correct scientific notation and three significant digits?
0.14 x 103 g/ml
0.14 x 10-3 g/ml
1.42 x 103 g/ml
1.42 x 10-3 g/ml
How many electrons are in Al+3?
3
10
13
16
What is the most common ion for element 19?
F-1
F+1
K-1
K+1
What is the most common ion for Sodium?
S-2
S+2
Na-1
Na+1
An unknown compound displays the following properties: Melts at 714 0C (1317 0F), dissolves when added to water and conducts electricity in the molten state. How would you classify this compound?
Ionic
Molecular
Non-polar
Polar
Electronegativity ______ going across a period and ______ going down a group.
Increases, Decreases
Increases, Increases
Decreases, Increases
Decreases, Decreases
Atomic Radii _____ going across a period and ______ going down a group.
Increases, Decreases
Increases, Increases
Decreases, Increases
Decreases, Decreases
How do you convert from kelvin to Celsius?
Use a mathematical equation involving multiplying by 1.8
Use a mathematical equation involving dividing by 1.8
Subtract 273
Add 273
What unit shown represents density?
g/ml3
g/cm3
kg/m2
kg/L2
When measuring in chemistry STP stands for
Standard Temperature Practice
Standard Temperature and Pressure
Standard Test Pressure
Standard Test Practice
Which would be larger, Magnesium atomic radius or ionic radius?
Atomic
Ionic
They would be the same
You need numbers to decide
Which is more electronegative, Phosphorus, Sulfur or Chlorine?
Phosphorus
Sulfur
Chlorine
They are all the same because they are in the same period
What happens to the net potential energy as a molecular compound is formed?
It decreases
It increases
It decreases then increases
It stays the same
How are molecular compounds and Noble gases similar?
They both have the same number of valence electrons They both are stable They both have lowered energy All of the above
They both are stable
They both have lowered energy
All of the above
Carbon has an electronegativity of 2.5 and Oxygen has an electronegativity of 3.5. Based on this information what type of bond is found in carbon monoxide (CO)?
Ionic
Polar-covalent
Nonpolar-covalent
Impossible to tell
Calcium has an electronegativity of 1.0 and Chlorine has an electronegativity of 3.0. Based on this information what type of bond is found in calcium chloride (CaCl2)?
Ionic
Polar-covalent
Nonpolar-covalent
Impossible to tell
Which of the following is a mixture?
Carbon
Methane
Air
Ice
Which of the following statements is true?
The composition of the same compound varies depending on where it occurs
A compound is a heterogeneous mixture of two or more elements
In general, the properties of a compound are different from those of its component elements
Filtration can be used to separate a mixture of two liquids
What is the most common oxidation number for group 16?
+2
-2
+6
-6
What is the equivalency between kg and grams?
1 gram = 1000 kg
1 kg = 1000 g
1 gram = 10,000 kg
1 kg = 10,000 g
Convert to correct scientific notation: 0.00476 x 10-5 L
4.76 x 10-2 L
4.76 x 10-8 L
4.76 x 102 L
4.76 x 108 L
Convert to correct standard notation: 14.3 x 102 m
1430 m
0.143 m
143 X 101 m
1.43 X 103 m
What is the temperature in 0C for -20 0F? NOTE: 0C = (0F-32) / 1.8
-4.00 0C
6.67 0C
-28.9 0C
253 0C
Which of the following substances can be decomposed (broken down) by a chemical change?
Ammonia (NH3)
Argon (Ar)
Salt Water
All of the above
Ice, liquid water and water vapor (steam) have:
Similar physical properties and chemical properties
Similar physical properties but different chemical properties
Different physical properties but similar chemical properties
Identical physical properties and chemical properties
At 1 atm pressure and 20 0C all water must have the same
Mass
Density
Volume
Weight
Which of the following is characteristic of a compound?
Pure substance
Homogeneous
Contains different kinds of atoms
All of the above
Which of the following is a diatom?
Boron
Calcium
Hydrogen
Sodium
Which of the following is a compound?
Fe
CO
O2
K
Which of the following is most likely to form an anion?
A metal
A nonmetal
A metalloid
A noble gas
Based on the drawing, what is the length of the rectangle shown?
1.80 cm
1.85 cm
1.90 cm
2.15 cm
Bobby measures the width of an object to be 1.54 cm. Which digits in this measurement are certain?
The 1 only
The 1 and 5
The 1, 5 and 4
None of the digits are certain.
Anything that has mass and occupies space is _____.
A mixture
A solid
A compound
A type of matter
How many Hydrogen atoms are there in a molecule of sugar (C6H12O6)
1
6
12
24
What are the missing entries in Table 4?
X=11, Y=11
X=11, Y=12
X=12, Y=23
X=12, Y=11
To which group does the element lithium belong?
Halogens
Alkali metals
Alkaline Earth metals
Noble gases
To which group does the element Astatine belong?
Halogens
Alkali metals
Alkaline Earth metals
Noble gases
