FREE CHEMISTRY AND STUDY GAMES ABOUT

PDF Download

FREE CHEMISTRY AND STUDY GAMES ABOUT

SIGNIFICANT DIGITS EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -35 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Which is more precise?

6329.1 cm or 63.21 cm

Answer:

63.21 cm

Question 2: Which number is more precise?

0.33 m or 0.3 m

Answer:

0.33 m

Question 3: Round 0.001775 to two Significant Figures.

Answer:

0.0018 To get this, first determine the number of SD's. Drop all digits after last significant place below

• However if that digit is above 5, round up the value of the last significant figure.

Question 4: How many Significant Digits does 50.002 have? Why?

Answer:

• SD's because zeroes are in between non-zeroes.

Question 5: How many significant digits does 9800 have?

Answer:

Two significant digits

Question 6: How many significant figures would 500.0 have? Why?

Answer:

• SD's because zeroes are to the right of a significant figure and a decimal place.

Question 7: Perform the calculation and express the answer in the correct number of sig.figs.

0.350 ml + 1.70 ml + 1.019 ml

Answer:

3.07 ml

Question 8: Which is more precise?

7.92 L or 792 L

Answer:

7.92 L

Question 9: Write the number of SD's for: 0.0003 ml

Answer:

1 Question 10: Perform the calculation and express the answer in the correct number of sig.figs.

1.12 g/92 ml

Answer:

0.12 g/ml

Question 11: How many significant digits does 7003 have? Why?

Answer:

7003 has four significant figures because zeroes between two significant figures are always significant.Question 12: Perform the calculation and express the answer in the correct number of sig.figs.

1.2 m x 3.33 m

Answer:

4.0 m>2 meters squared)

Question 13: Which is least precise?

8.094 mm or 80.94 mm

Answer:

80.94 mm

Question 14: How many SD's would 2400 g have if you had measured the quantity?

Answer:

• SD's. This is because you measured the quantity.

Question 15: Which is least precise?

7000.0 kg or 7000 kg

Answer:

7000 kg Question 16: Perform the calculation and express the answer in the correct number of sig.figs.

87.9478 L - 86.25 L

Answer:

1.70 L

Question 17: If you have no idea how a value of 1300 km was measured, how many SD's would it have?

Answer:

• SD's. This is because zeroes after a non-zero number are insignificant, they only act as placeholders.

Question 18: What is precision?

Answer:

Precision is the consistency of a result or how reproducible it is. Precision depends on the unit used to measure - the smaller the unit, the more precise the measurement is.Question 19: Write the number of SD's for: 24.7 kg

Answer:

3

Question 20: Write the number of SD's for: 2.5 g

Answer:

2 Question 21: Write the number of SD's for: 0.24701 L

Answer:

5 Question 22: Perform the calculation and express the answer in the correct number of sig.figs.

5.841 g x 6.03 g

Answer:

35.2 g>2 (grams squared) Question 23: Write the number of SD's for: 247.7 ml

Answer:

4

Question 24: How many Significant Digits does 5002 have? Why?

Answer:

• SD's because zeroes are in between 2 non-zeroes.

Question 25: Which is least precise?

7742.34 g or 7.74234 g

Answer:

7742.34 g

Question 26: Does 0.0005 have one, four or five SD's?

Answer:

Therefore, only the 5 is significant so there is only 1 SD.Question 27: Perform the calculation and express the answer in the correct number of sig.figs.

55.671 g + 45.78 g

Answer:

101.45 g