Download CP Chemistry Midterm A 2012-2013

COLLEGE CHEMISTRY
Midterm Exam
Test # A
Directions: DO NOT WTITE ON THIS TEST! Instead, mark all of your answers on the
scantron sheet provided. Read each question carefully and mark the response that BEST
answers the question.
1.
A physical change occurs when a
a. peach spoils
b. copper bowl tarnishes
c. bracelet turns your wrists green
d. glue gun melts a glue stick.
2. The temperature that is equivalent to 200 C is
a. 253 K
b. 293 K
c. -293 K
d. 13/7 K
3. To
a.
b.
c.
d.
two significant figures, the measurement 0.0255 g should be reported as
0.02 g
0.025 g
0.026 g
2.5 x10 2 g
4. The number of significant figures in the measurement 0.000305 kg is
a. 3
b. 4
c. 5
d. 6
5. Experiments with cathode rays led to the discovery of the
a. proton
b. nucleus
c. neutron
d. electron
6. The mass of a neutron is
a. about the same as that of a proton
b. about the same as that of an electron
c. double that of a proton
d. double that of an electron
7. An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass
number is
a. 13
b. 14
c. 27
d. 40
8. Which of the following rules requires that each of the p orbitals at a particular energy
level receive one electron before any of them can have two electrons?
a. Hund's rule
b. The Pauli exclusion principle
c. The Aufbau principle
d. The quantum rule
9. The idea of arranging the elements in the periodic table according to their chemical and
physical properties is attributed to
a. Mendeleev
b. Moseley
c. Bohr
d. Ramsay
10. The periodic law states that the physical and chemical properties of elements are
periodic functions of their atomic
a. masses
b. numbers
c. radii
d. particles
11. Elements in a group or column in the periodic table can be expected to have similar
a. atomic masses
b. atomic numbers
c. number of neutrons
d. properties
12. Moving from left to right across ________, electrons are being added to the 4f
orbital.
a. the noble gases
b. the halogens
c. the lanthanides
d. Period 4
13. Nonmetallic elements in Group 17 that react with metals to form salts are called
a. alkali metals
b. halogens
c. lanthanides
d. noble gasses
14. A substance is called malleable if it
a. has a shiny appearance
b. can be hammered into sheets
c. can conduct electricity
d. exists naturally as an element
15. Which of the following is NOT a unit?
a. meter
b. gram
c. mass
d. liter
16. Around 400 B. C., atomic theory
a. was first proposed by John Dalton
b. was the philosophy that all matter is made of atoms
c. stated that atom are made of protons, neutrons and electrons
d. all of the above.
17. Because atoms are electrically neutral, we can conclude that
a. atoms have different numbers of protons and neutrons
b. atoms have different numbers of protons and electrons
c. atoms have equal numbers of protons and neutrons
d. atoms have equal numbers of protons and electrons
18. If you know the atomic number of an atom, you also know
a. the total number of protons and neutrons
b. the number of protons only
c. the number of protons and electrons
d. the number of neutrons only
19. If you know the mass number of an atom, you also know
a. the total number of protons and neutrons
b. the number of protons only
c. the number of protons and electrons
d. the number of neutrons only
20. Atoms of the same element can have different numbers of
a. protons
b. neutrons
c. electrons
d. alpha particles
21. Isotopes are
a. atoms of the same element with different atomic numbers
b. atoms of the same element with different numbers of neutrons
c. atoms of the same element with different mass numbers
d. both b and c are correct
e. both a and b are correct
22. Which of the following is NOT an example of electromagnetic radiation?
a. microwaves
b. radio waves
c. alpha particles
d. visible light
23. Wavelength
a. is the number of waves that pass a point during a given time
b. is the distance between corresponding points on adjacent waves
c. goes up as frequency goes down
d. both b and c are correct
24. When
a.
b.
c.
d.
an electron in an atom is in the ground state
it is in its lowest possible energy state
it is in its highest possible energy state
it is said to be an "excited" electron
its energy is zero
25. When an electron falls back down from an excited state to the ground state
a. it absorbs energy in the form of light
b. it releases energy in the form of light
c. it absorbs energy in the form of electricity
d. none of the above
26. Quantum numbers describe
a. the spin of the electrons in an orbital
b. the properties of the orbital and the electrons in it
c. the orientation of orbital about the nucleus
d. the shape of the orbital
e. all of the above
27. Orbitals are
a. regions around the nucleus where electrons are most likely to be found
b. specific paths around the nucleus that electrons must follow
c. places where protons and neutrons are found
d. all of the above
z
z
y
y
z
x
figure A
x
figure B
x
figure C
28. Which figure above shows an s orbital?
a. figure A
b. figure B
c. figure C
d. none of the above
c. figure C
d. none of the above
29. Which figure shows a pz orbital?
a. figure A
b. figure B
30. A change of state is
a. a chemical change of a substance from one form to another, like from paper
to ash and smoke
b. a physical change of a substance from one form to another, like from a liquid
to a gas
c. a change in which new substances are formed like when water changes to ice
d. all of the above
31. Which of the following is a chemical property?
a. boiling point
b. freezing point
c. flammability
d. all of the above
32. Volume
a.
b.
c.
d.
33. Weight
a.
b.
c.
d.
is the amount of matter in an object
is the amount of space an object occupies
can be measured in grams
all answers are correct
is the same as mass
is not affected by gravity
is measured on a scale
is measured on a triple beam balance
34. Significant figures are
a. all of the certain digits plus one uncertain digit
b. all of the certain digits only
c. all of the certain digits plus one unknown digit
d. none of the above
35. Which
a.
b.
c.
d.
of the following is true about significant figures?
nonzero digits are always significant
nonzero digits are never significant
zeros are always significant
zeros are never significant
36. Zeros are significant when
a. they serve as place holders
b. they appear in front of a nonzero number in a decimal
c. they are sandwiched between two nonzero numbers
d. all of the above
37. Zeros are NOT significant when
a. they appear between two nonzero numbers
b. they appear at the end of a number and to the right of a decimal
c. they appear at the end of a number without a decimal point
d. they appear at the end of a number with a decimal point
38. When multiplying or dividing using significant figures
a. round the answer to two places beyond the decimal
b. round the answer to the same number of significant figures as the measurement
with the most significant figures
c. round the answer to the same number of significant figures as the measurement
with the least significant figures
d. round the answer after adding the exponents
39. When adding or subtracting using significant figures
a. the answer can have no more digits to the right of the decimal point than there
are in the measurement with the smallest number of digits to the right of the
decimal point
b. the answer can have no more digits to the right of the decimal point than there
are in the measurement with the greatest number of digits to the right of the
decimal point
c. round the calculation to the same number of significant figures as the
measurement having the least number of significant figures
d. round the calculation to the same number of significant figures as the
measurement having the most significant figures
40. All measurements in science
a. must be written in scientific notation
b. have some uncertainty in them
c. are always accurate and precise
d. only include digits that are certain
41. The study of matter and the changes it undergoes best describes the science of
a. biology
b. physics
c. microbiology
d. chemistry
42. Matter that is free to move and fills its available volume is in the ________state.
a. liquid
b. solid
c. gaseous
d. elemental
43. Matter includes all of the following EXCEPT
a. air
b. light
c. smoke
d. water vapor
44. The state of matter in which a material has definite shape and definite volume is the
_________state.
a. Liquid
b. Solid
c. gaseous
d. vaporous
45. The particles in a solid are
a. packed closely together
b. very far apart
c. constantly in motion
d. able to slide past each other
46. To
a.
b.
c.
d.
determine density, the quantities that must be measured are
mass and weight
volume and weight
volume and concentration
volume and mass
47. The smallest unit of an element that maintains the properties of that element is
a. an atom
b. a compound
c. a pure substance
d. an element
48. Mass is
a. anything that takes up space
b. a measure of the amount of matter in an object
c. measured on a triple beam balance
d. both b and c are correct
49. Which of the following is a compound?
a. water
b. aluminum
c. air
d. both a and c above
50. Which of the following is a chemical change?
a. water boiling
b. ice melting
c. salt dissolving
d. none of the above
COLLEGE CHEMISTRY
Midterm Exam Worksheet
1.
Name________________________
Date______________Per________
Solve the following Metric conversions. Show all work!
461mL =_____________L
5.64 cm =___________ m
0..360Kg =_________ g
36mg = _________ Kg
0.0048hg = _________cg
2. Put the following numbers in scientific notation
3500
.000450
_________________
_________________
40360004
_________________
.8060
_________________
90600
_________________
3. Determine the number of significant figures in the following measurements.
a.
40050 g ________________
b. 0.774 kg________________
c.
30.06 mL _______________
d. 25500 mg________________
e.
0.0009m_______________
4. Perform the following calculations, and express the result in the correct units and
number of significant figures.
a. 58.0 /3.2
answer: ________________
b. 250 x 46
answer:________________
c. 3.60 + 2.302
answer:________________
d. 2.534 - .32
answer: _______________
e. 0.00605 x 0.053
answer:________________
5. Identify each region corresponding to a s,p,d,f block
A______
B______
C______
D______
6. Write the orbital notation, electron configuration, and noble gas for S, sulfur.
Answer: Orbital notation
_________________________________________________________________
Answer: electron configuration
_________________________________________________________________
Answer: noble gas notation
__________________________________________________________________
7. Use the graph and data (Table 1-1) below to answer the following questions:
Table 1-1
Block Mass (g)
1
1.2
2
5.7
3
15.3
4
22.7
Volume (cm3)
0.4
2.1
5.7
8.4
a. Plot the data
b. Draw best-fit line
c. Calculate the slope (show work below and on the graph)
Answer: ____________________
8. How many electrons, neutrons and protons does U-238 have (atomic number 92)?
Protons:_________________________
Neutrons:________________________
Electrons:________________________
9. Solve the following density problems. Show all work!
a. Diamond has a density of 3.26 g/cm3. What is the mass of a diamond that has a
volume of 0.460 cm3? (Show your work and units)
b. What is the volume of a sample of liquid mercury that has a mass of 87.3 g, given
that the density of mercury is 13.6 g/mL? (Show your work and units)
c. A sample of aluminum metal has a mass of 8.4 g. The volume of the sample is 3.1
cm3. Calculate the density of aluminum. (Show your work and units)
10. Read the length of the arrow shown and the volume of liquid shown in the figure below.
Be sure to read as accurately as possible and include the proper units in your answer.
______0 cm
___
___
___
___
_______
___
___
___
___
_______1 cm
a. ___________________
_____10 mL
___
___
___
___
_______
___
___
___
___
______9 mL
b. ____________________