Midterm PreQuiz 1-4-19

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Name_____________________
Midterm PreQuiz
1. In an experiment, the variable being tested or the variable that is manipulated is
a. dependent
b. Control
c. conclusion
d. independent
2. A scientist hypothesizes how the temperature will affect whether the alligator will be
male or female. The dependent variable is
a. the size of the baby alligators
b. the temperature
c. the gender of the baby alligators
d. the incubator
3. You dampen a tissue and put it into a jar. You close the liquid tightly so no matter can
enter or exit and set it in the sunlight. After a while you notice that the jar looks kind of
cloudy, and small water droplets are on the inside of the jar. What has happened to the mass
of the tissue/jar system?
a. the mass has increased
b. the mass has decreased
c. the mass has not changed
d. the mass could increase or decrease depending on the type of liquid.
4. The accepted value is 23.35. Which correctly describes the student’s experimental data?
Trial
Measurement
1
35.63
2
34.97
3
35.33
a. accurate but not precise
b. precise but not accurate
c. both accurate and precise
d. neither accurate nor precise
5. The graduated cylinder on the right should be read as (Use
significant figures):
a. 6.57 mL
b. 6.600 mL
c. 6.6 mL
d. 6.600 mL
6. Read the length on the ruler below. The units are centimeters. (Use significant figures).
a. 11.7 cm
b. 11.9 cm
c. 11.95 cm
d. 11.900 cm
7. Which element below has the smallest atomic radius?
a. Cl
c. Na
b. Fe
d. Cs
8. Which element below has the lowest electronegativity?
a. Cl
c. Ca
b. Fr
d. F
9. Which of the following is the best definition for electronegativity?
a. The energy it takes to remove an electron from an atom, forming an ion
b. The size of an atom, including its electron cloud
c. How strongly an atom pulls on other atoms’ electrons in chemical bonds
d. How strongly an atom pulls on other atoms’ protons in chemical bonds
10. How many valence electrons are represented on the blank Lewis Dot Diagram below?
(The letter would go in the rectangle.)
c. 3
d. 2
a. 5
b. 4
11 . Which of the following atoms and ions could be represented by the blank Lewis Dot
Diagram above in #10?
a. B
c. C+
b. P
d. S–
Answer Sheet
Question #
from previous
Key
exam
PreQuiz Question # Skills/Standards
PreQuiz
Correct
Answer
Unit 3 Q4
D
1
Periodic Trends
Unit 3 Q5
2
Periodic Trends
C
Unit 3 Q6
3
Periodic Trends
C
Unit 3 Q8
4
Atomic Structure
B
Unit 3 Q11
5
Electron
Configuration
A
Interim Q6
6
Experimental Design C
Interim 9
7
Experimental Design A
Interim 13
8
Conservation of
Mass
B
Interim 21
9
Accuracy vs
Precision
C
Interim 22
10
Significant Figures
A
Interim 23
11
Significant Figures
B
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