Measurement and Sig Figs

Question 1

How many sig figs are in: 0.0070080 g

Answer 1

5 sig figs, leading zeros to the left of the first nonzero # are not significant

Question 2

How many sig figs are in: 4.800 x 10^6 km

Answer 2

4 sig figs

Question 3

How many sig figs are in: 301000. s & 2.00000 g

Answer 3

Both have 6 sig figs

Question 4

How many sig figs are in: 0.000001 g & 0.00361 L

Answer 4

The one in grams has 1 sig fig and the one in liters has 3 sig figs

Question 5

How many sig figs are in: 6150000 m

Answer 5

3 sig figs. Trailing zeros at the end of a number are not significant

Question 6

Convert 6150000 m to scientific notation

Answer 6

6.15 x 10^6

Question 7

If 5983 were converted to scientific notation, would it have a positive or negative exponent?

Answer 7

It would have a positive exponent since it is moved to the left. 5983 > 5.983 x 10^3

Question 8

If 0.00034 were converted to scientific notation, would it have a positive or negative exponent?

Answer 8

It would have a negative exponent since it is moved to the right. 0.00034 > 3.4 x 10^-4

Question 9

How do sig figs relate to uncertainty in measurement?

Answer 9

Every digit is certain except for the last, which we estimate; the more certain a measurement is, the more digits it can have.

Question 10

What is an exact number?

Answer 10

A value that is known with complete certainty, it has no uncertainty associated with it. They have unlimited sig figs

Question 11

What are examples of EXACT numbers?

Answer 11

i. 12 inches in a foot
ii. 1 meter=100 centimeters

Question 12

What is an inexact number and examples of them?

Answer 12

Numbers recorded as part of a data set (approximations); the length of a table measured 1.5 meters, the temperature is 22.5° C

Question 13

What is the relationship between length and volume?

Answer 13

Length = length x width

Question 14

SI unit for volume

Answer 14

Cubic meter (m^3)

Question 15

SI unit for mass

Answer 15

Kilogram (kg)

Question 16

SI unit for time

Answer 16

Second (s)

Question 17

SI unit for temperature

Answer 17

Kelvin (K)

Question 18

Symbol, numerical meaning & meaning for Mega

Answer 18

M, 10^6, million

Question 19

Symbol, numerical meaning and meaning for kilo

Answer 19

k, 10^3, thousand

Question 20

Symbol, numerical meaning and meaning for deci

Answer 20

d, 10^-1, tenth

Question 21

Symbol, numerical meaning and meaning for centi

Answer 21

c, 10^-2, hundredth

Question 22

Symbol, numerical meaning and meaning for milli

Answer 22

m, 10^-3, thousandth

Question 23

Symbol, numerical meaning and meaning for micro

Answer 23

u, 10^-6, millionth

Question 24

Symbol, numerical meaning and meaning for nano

Answer 24

n, 10^-9, billionth

Question 25

What is n equality statement?

Answer 25

A relationship between two quantities are the same. ex. 1 yd=3ft

Question 26

What is a conversion factor?

Answer 26

A number used to change one set of units to another by multiplying or dividing

Question 27

Problem solving method for multi step problems

Answer 27

Sort - identify the given and what you need to find Strategize - relationships (conversion factors, formulas) solution map & dimensional analysis Solve - correct units & sig figs Check

Question 28

Why is density?

Answer 28

A measurement of how tightly packed the mass of a substance or object is. (D = m/v) (1cm^3 = 1 mL)