Chapter 2 - Review

Question 1

Sigfig: 275

Answer 1

3 (all non zero Digits)

Question 2

Sigfig: 2.75

Answer 2

3 (all non zeros Digits)

Question 3

SF: 0.02

Answer 3

1 (Beginning zeros don’t count)

Question 4

SF: 501.0

Answer 4

4 (trailing zero with decimal counts)

Question 5

SF:0.0256

Answer 5

3 (Beginning zeros dont cont

Question 6

SF: 450000

Answer 6

2 (Trailing zeroes don’t count if no decimal)

Question 7

SF: 0.020

Answer 7

2 Beginning zeroes don’t count, trailing do if decimal

Question 8

SF: 5000

Answer 8

1 (Trailing doesn’t count if no decimal

Question 9

SF: 0.0990

Answer 9

3 (Trailing count if yes decimal)

Question 10

SF: 50700

Answer 10

3 surrouded zero counts but trailing zero without decimal don’t

Question 11

SF: 501

Answer 11

3 Surrounded zero

Question 12

5000.

Answer 12

4 Trailing zeroes count because decimal is present.

Question 13

Round to 3 SF: 34595

Answer 13

34600 (ZEROS IN THIS CASE ARE NOT SF SO YOU CAN ADD THEM)

Question 14

Round to 3: 3.935

Answer 14

3.94 (YOU CAN’T WRITE 3.940 BECAUSE THE ZERO WOULD BE AN SF SINCE THERE’S A DECIMAL)

Question 15

Round to 3: 5684

Answer 15

5680 (ZERO NOT SF)

Question 16

Round to 3: 0.008736

Answer 16

0.00874 (BEGINNING ZEROES ARE NOT SF)

Question 17

ROUND TO 3: 28.45

Answer 17

28.5 (NO ZERO BECAUSE IT WOULD BE SF IF ADDED BECAUSE OF THE DECIMAL)

Question 18

ROUND TO 3: 10245

Answer 18

10200 (TRAILING ZEROS ARE NOT SIG IN THIS CASE BECAUSE NO DECIMAL)

Question 19

CALCULATE AND ROUND UP TO PROPER SF: 32.45/4.5

Answer 19

7.2111111 = 7.2 (BECAUSE THE LEAST AMOUNT OF SF IN THE ORIGINAL EQUATION WAS 2 [4.5])

Question 20

CALCULATE AND ROUND UP TO PROPER SF: 567.90 * 4.6

Answer 20

2612.34 = 2600 (2 SF BECAUSE OF [4.6] THE ZEROES ARE NOT SF BECAUSE THEY’RE TRAILING WITHOUT DECIMAL POINTS)

Question 21

CALCULATE AND ROUND UP TO PROPER SF: 56.795 + 1.2

Answer 21

57.995 = 58.0 (THE LEAST PRECISE NUMBER IS 1.2 IN THIS CASE WHICH ENDS IN THE TENTH PLACE AFTER THE DECIMAL)

Question 22

CONVERT TO S.N.: 0.000,000,589,3 m

Answer 22

5.893 * 10^-7 m (KEEP UNITS AND ALL SF)

Question 23

CONVERT TO S.N.: 299,793,000 m/s

Answer 23

2.99793 * 10^8 m/s (KEEP UNITS AND SF)

Question 24

CONVERT TO S.N.: 0.000,000,000,000,000,000,000,001,660,531 g

Answer 24

1.660531 * 10^-24 g (KEEP UNITS AND SF)

Question 25

CONVERT TO S.N.: 602,200,000,000,000,000,000,000

Answer 25

6.022 x 10^23 (KEEP UNITS AND SF)

Question 26

ROUND TO 3 SF: 0.004798

Answer 26

0.00480 (THE BEGINNING ZEROES NEVER COUNT, THE TRAILING ZERO COUNTS IN THIS CASE BECAUSE DECIMAL IS PRESENT)

Question 27

ROUND TO 3 SF: 8125

Answer 27

8130 (TRAILING ZERO DOESN’T COUNT BECAUSE NO DECIMAL)

Question 28

CALCULATE AND ANSWER WITH PROPER SF: 42.1 * 0.10

Answer 28

4.2 (0.10 HAS 2 SF’S WHICH IS THE LEAST AMOUNT)

Question 29

CALCULATE AND ANSWER WITH PROPER SF: (6.02 * 10^23) * (2.0 * 10^2)

Answer 29

1.2 * 10^25 (TWO SF BECAUSE 2.0)

Question 30

CALCULATE AND ANSWER WITH PROPER SF: (0.2465)(0.25)//1.58

Answer 30

0.039 (TWO SF BECAUSE OF THE 0.25)

Question 31

CALCULATE AND ANSWER WITH PROPER SF: 1.01 - 0.585

Answer 31

0.43 (1.01 IS THE LEAST PRECISE AND IT’S ENDS IN THE HUNDREDTH PLACE)

Question 32

CALCULATE AND ANSWER WITH PROPER SF: 20.45 + 214.1 + 0.035

Answer 32

234.6 (214.1 IS THE LEAST PRECISE BECAUSE IT ENDS IN THE TENTH PLACE)

Question 33

WRITE IN SCIENTIFIC NOTATION: 0.001076

Answer 33

1.076 * 10^-3

Question 34

WRITE IN SCIENTIFIC NOTATION: 60170

Answer 34

6.017 * 10^4 (KEE ALL UNITS AND SF, THE TRAILING IS NOT SF IN THIS CASE BECAUSE THERE’S NO DECIMAL PRESENT)

Question 35

WRITE IN REGULAR NOTATION: 3.060 * 10^-4

Answer 35

0.0003060

Question 36

WRITE IN REGULAR NOTATION: 5.1 * 10^2

Answer 36

510

Question 37

THE MASS OF 50.0 ml OF OIL IS MEASURED AS 45.2 grams. WHAT IS THE DENSITY OF THIS OIL?

Answer 37

[DENSITY = MASS/VOLUME] 50.0 ml/ 45.2 grams = 1.10619469 = 1.11 g/ml