Question 1

Which of the following is an example of qualitative data collected during a chemical experiment?

Accepted Answer

The magnesium burned with a bright, white flame.

Question 2

Which SI base unit is used to measure the amount of substance?

Accepted Answer

mole (mol)

Question 3

A measurement is recorded as 0.003000 m. How many significant figures does this value have?

Accepted Answer

5

Question 4

Which of the following SI prefixes represents a factor of $$10^6$$?

Accepted Answer

mega

Question 5

A student measures the mass of a sample using different balances. Which balance is likely to provide the most precise measurement?

Accepted Answer

Exacto-Balance

Question 6

Which of the following numbers has three significant figures?

Accepted Answer

1.00

Question 7

When adding $$2.987$$, $$0.23$$, and $$5.0000$$, what is the correct answer rounded according to significant figure rules?

Accepted Answer

$$8.22$$

Question 8

Which derived SI unit is correctly matched with its expression in base SI units?

Accepted Answer

Pascal (Pa): $$kg\ m$$^{-1}$$\ s$$^{-2}$$

Question 9

A measurement is recorded as 56000. How many significant figures does this value have?

Accepted Answer

2

Question 10

Which of the following is an exact number?

Accepted Answer

The number of students in a classroom

Question 11

When multiplying $$2.34 	imes 45.779 \div 0.0344$$, what is the answer rounded to the correct number of significant figures?

Accepted Answer

$$3110$$

Question 12

Which measurement device would provide the least precise measurement of a 5 cm object?

Accepted Answer

Ruler A

Question 13

Which of the following statements about significant figures is TRUE?

Accepted Answer

Trailing zeros in numbers with a decimal point are significant.

Question 14

A student records a measurement as 0.120 g. How many significant figures does this value have?

Accepted Answer

3

Question 15

Which SI prefix would you use to express a distance of $$0.000001$$ meters?

Accepted Answer

micro

Question 16

If you add $$104.250$$ and $$90.8966$$, what is the correct answer rounded according to significant figure rules?

Accepted Answer

$$195.15$$

Question 17

Which of the following is NOT a base SI unit?

Accepted Answer

joule (J)

Question 18

A scientist measures a sample as 1.00 g. What does the number of significant figures indicate about the measurement?

Accepted Answer

The measurement is more precise than 1 g.

Question 19

Which of the following is a derived SI unit?

Accepted Answer

joule (J)

Question 20

A student rounds the number 402.5367 to four significant figures. What is the result?

Accepted Answer

402.54

Measurement in Chemistry: Uncertainties, SI Units, and Significant Figures

스터디 가이드 - 연습 문제