Chemistry Practice Midterm Part 1
This 'quiz' is to help prepare introductory chemistry students for their first midterm.
- 1.Which branch of chemistry focuses on compounds with carbon?
- A.
Inorganic
- B.
Organic
- C.
Analytical
- D.
Biochemistry
- 2.Which of the following is not a step of the scientific method?
- A.
Hypothesis
- B.
Conclusion
- C.
Observations
- D.
Graphing
- 3.What is the goal of the scientific method?
- A.
To prove the hypothesis correct.
- B.
To find a conclusion that you want.
- C.
To explore and test a hypothesis in order to find a conclusion.
- D.
To create a new theory.
- 4.Which of the following is correct about ozone?
- A.
It shields plants and animals from harmful UV rays.
- B.
It is located in the stratosphere.
- C.
It is made around the equator.
- D.
All of the above is correct.
- 5.Covert 4.0 x 103 kilometers to millimeters
- A.
4.0 x 10^3 mm
- B.
4.0 mm
- C.
4.0 x 10^9 mm
- D.
4.0 x 10^-3 mm
- 6.Which of the following is not true about the rules of graphing?
- A.
The independent variable goes on the x axis.
- B.
The dependent variable goes on the x axis.
- C.
Titles should be written as y vs. x.
- D.
The dependent variable is on the y axis.
- 7.When recording data for a experiment or measurement you should always....
- A.
Record every value you know with certainty.
- B.
Wait to write down numbers until the calculations are finished.
- C.
Count significant digits.
- D.
Record every value you know with certainty plus one estimated digit.
- 8.Which of the following conversions is correct?
- A.
1000 cm^3 = 1 liter
- B.
1 dm^3 = 100 ml
- C.
1 cm^3 = 100 ml
- D.
They are all incorrect.
- 9.What is an extensive property?
- A.
A form of qualitative data.
- B.
A property that depends upon the amount of a substance.
- C.
A property that doesn't depend upon the amount of a substance.
- D.
A chemical property that depends upon an external variable.
- 10.Which of the following are a physical changes?
- A.
Leaves changing colors in the fall.
- B.
Dry ice subliming into CO2.
- C.
Copper turning green in moist air.
- D.
Fruit ripening.
- 11.Which of the following are chemical changes?
- A.
An explosion
- B.
Iron rusting.
- C.
Frying an egg.
- D.
All the above are chemical changes.
- 12.Which of the following are considered a homogeneous mixture?
- A.
Salad
- B.
Vegetable soup
- C.
Water
- D.
Alloy
- 13.How do the properties of a compound relate to the properties of the elements that comprise it?
- A.
The properties of the individual elements do not determine the properties of the compound.
- B.
The element that is most abundant determines the properties of the compound.
- C.
It depends if the ratio is 50/50; if it is, the properties of the compound will be equally shared from the elements.
- D.
The properties of the compound will that of one of the elements. We just don't know which one.
- 14.What was discovered from the cathode ray tube?
- A.
Protons
- B.
Electrons
- C.
Neutrons
- D.
Atoms
- 15.What ratio makes an atom neutral?
- A.
1:1 ratio of protons to neutrons
- B.
1:1 ratio of electrons to neutrons
- C.
1:1 ratio of protons to electrons
- D.
None of these. It depends upon the protons only.
- 16.What ratio makes an atom most stable?
- A.
1:1 ratio of protons to neutrons
- B.
1:1 ratio of electrons to neutrons
- C.
1:1 ratio of protons to electrons
- D.
None of these. It depends upon the protons only.
- 17.What are isotopes?
- A.
A charged atom that has gained or lost an electron.
- B.
An atom that has a different number of protons.
- C.
An atom that has a different number of neutrons.
- D.
An atom that has a different number of electrons.
- 18.Which relationship is true?
- A.
Wavelength increases as frequency decreases.
- B.
Wavelength increases as frequency increases.
- C.
Energy increases as frequency decreases.
- D.
Energy decreases as wavelength decreases.
- 19.What do the joules measure?
- A.
Atomic radius
- B.
Energy
- C.
Wavelength
- D.
Frequency
- 20.What is the SI for frequency?
- A.
Meters
- B.
Joules
- C.
Seconds
- D.
Hertz
- 21.Which of the following is true about atomic emission spectra?
- A.
It shows all the colors of the rainbow and therefore all visible wavelengths.
- B.
Each element produces a unique sequence of bright lines.
- C.
It is produced when atoms absorb energy.
- D.
All of the above it correct.
- 22.How many valence electrons are in the following configuration?[Ar] 4s2 3d10 4p4
- A.
2
- B.
10
- C.
4
- D.
6
- 23.What is the octet rule?
- A.
An atom will gain, lose or share electrons to achieve 8 valence electrons.
- B.
The maximum number of valence electrons an atom can have is 8.
- C.
Chemical properties repeat every 8 elements.
- D.
None of the above are correct.
- 24.Which of the following is/are true?A) Negative ions gain an electron and their radius gets smaller.B) Positive ions gain an electron and their radius gets smaller.C) Negative ions gain an electron and their radius gets larger.D) Positive ions gain an electron and their radius gets larger.E) Negative ions lose an electron and their radius gets smaller.F) Positive ions lose an electron and their radius gets smaller.G) Negative ions lose an electron and their radius gets larger.H) Positive ions lose an electron and their radius gets larger.
- A.
D and E
- B.
B and G
- C.
A and H
- D.
C and F
- 25.The control in the experiment....
- A.
Is always held constant.
- B.
Is the same as the dependent variable.
- C.
Is the standard for comparison.
- D.
Is the independent variable.
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