Unit 0 Review

Quiz
•
Chemistry
•
11th Grade
•
Hard
Standards-aligned
Samantha Hyde
FREE Resource
18 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is NOT a standard safety rule in the laboratory?
Always wear safety goggles when working with chemicals
Never leave a lit Bunsen burner unattended
You can dispose of chemicals in the sink as long as they are liquid
Always wash your hands after handling chemicals
Answer explanation
Disposing of chemicals in the sink is unsafe and against standard laboratory rules, as it can cause contamination and environmental hazards. The other options are essential safety practices.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many significant figures are in the number 0.004520?
4
3
5
2
Answer explanation
The number 0.004520 has 4 significant figures. The leading zeros are not counted, but the digits 4, 5, 2, and the trailing zero after 2 are significant.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the result of the following addition, reported to the correct number of significant figures: 12.11 + 3.7
15.81
15.8
16
15.7
Answer explanation
To add 12.11 and 3.7, align the decimal points: 12.11 + 3.70 = 15.81. The result should be reported with the least number of decimal places, which is one (from 3.7). Thus, the answer is 15.8.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the correct result when multiplying 5.12 and 3.004, rounded to the correct number of significant figures?
15.37
15.36
15.4
15.3
Answer explanation
To multiply 5.12 (3 significant figures) and 3.004 (4 significant figures), the result is 15.36608. Rounding to 3 significant figures (the lesser count) gives 15.4, making it the correct answer.
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it important to report your final answer in a calculation with the correct number of significant figures?
To match the precision of your measuring instrument
To make your calculations look more accurate
To avoid rounding errors
To make your answers easier to understand
Answer explanation
Reporting your final answer with the correct number of significant figures is crucial to match the precision of your measuring instrument. This ensures that the accuracy of your calculations reflects the limitations of your measurements.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Round the following number to 2 significant figures: 0.003642
0.0036
0.0037
0.00364
0.0040
Answer explanation
To round 0.003642 to 2 significant figures, we focus on the first two non-zero digits, which are '3' and '6'. The next digit is '4', which does not round up. Thus, the answer is 0.0036.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many significant figures are in the number 4.500 x 10²?
3
4
2
5
Answer explanation
The number 4.500 x 10² has four significant figures. The digits 4, 5, 0, and 0 are all significant because the trailing zeros in a decimal number indicate precision.
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