Unit 1 Test Study Guide

Question 1

Write 0. 000 000 000 542 in scientific notation?

Answer 1

542 x 10^12

Question 2

Write 5008 km in scientific notation

Answer 2

.5008 x 10^-4

Question 3

What is the result of multiplying 2.5 10 by 3.5 10?

Answer 3

8750

Question 4

Spongebob was trying to make Krabby Patties that weighed 12oz. He made 4 Krabby Patties. They all had the following weights: 12.12oz 11.9oz 12.2oz 12.1oz.

Answer 4

This is an example of Significant figures.

Question 5

A class had a glass jar full of marbles. Each student guessed how many marbles the jar contained. Christina guessed 87 marbles and the jar had 88 marbles.

Answer 5

This is an example of Hypothesis.

Question 6

Make your own example of a group of measurements that are precise.

Answer 6

Length of the stem of plants: 1.12cm, 2.32cm and .056cm

Question 7

Make your own example of a group of measurements that are not precise.

Answer 7

Lengths of a pen: 2 and 1/3 of an inch

Question 8

Make your own example of a group of measurements that are not accurate and not precise.

Answer 8

Length of a car: 24 inches and ¾ of an inch

Question 9

How many significant figures are in the measurement 0.003415050 kg?

Answer 9

8 Significant Figures

Question 10

Express the product of 232 km and 251.0 km using the correct number of significant digits.

Answer 10

200km and 250 km = 500000 km

Question 11

Express the sum of 232.56 km and 251.2 km using the correct number of significant digits.

Answer 11

230 km and 250 km = 480 km

Question 12

Round 171.009 m to four significant digits:

Answer 12

171.0

Question 13

three significant digits:

Answer 13

171

Question 14

two significant digits:

Answer 14

170

Question 15

one significant digit:

Answer 15

200

Question 16

What is the volume of an object measuring 2.44 x 10-3 by 1.44 x 10-2 by 8.5 x 10-2?

Answer 16

0.000298656

Question 17

What is the main advantage of using the metric system over other systems of measurement?

Answer 17

You can have more precise and accurate answers.

Question 18

What are the SI (metric) units of:

Answer 18

a. Mass- m
b. Length-cm
c. Volume- cm^3
d. Temperature- F or C

Question 19

A substance boils at 259 K. What is the boiling point of this substance expressed in degrees Celsius?

Answer 19

.15 degrees Celsius

Question 20

What is 0.0088 meters in centimeters?

Answer 20

.88 cm

Question 21

What is the equation for density? (Write the words AND symbols)

Answer 21

Symbol is D for density, M for mass, and V for volume and its Density equals mass divided by volume

Question 22

What is the density of an object having a mass of 18.0 g and a volume of 55 cm?

Answer 22

.327 cm

Question 23

What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?

Answer 23

4.34385

Question 24

The mass of the electron is 9.10939kg. Round the mass to 1, 2, 3, and 4 significant figures.

Answer 24

10, 9.1, 9.11, 9.110

Question 25

The density of osmium, which is the densest metal, is 22.57 g/cm. What is the mass of a block of osmium that measures 1.00 cm 4.00 cm 2.50 cm?

Answer 25

225.7

Question 26

You are given a large irregularly shaped metal. Describe a method for determining the identity of the metal.

Answer 26

By weighing the mass and the volume, divide those and you get the density

Question 27

A student measures a mass of 202.2 g, whereas the correct mass is 205 g. What is the percent error?

Answer 27

She/He did not round the mass

Question 28

Scientific method-

Answer 28

A method of procedures where you do a systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypotheses.

Question 29

Hypothesis-

Answer 29

Where you make a statement without using an experiment to figure out it is true or false

Question 30

Independent variable-

Answer 30

a variable that is changed or controlled.

Question 31

Dependent variable-

Answer 31

variable that stays the same throughout the experiment

Question 32

Accuracy-

Answer 32

How close to correctness your answer is

Question 33

Precision-

Answer 33

How fined tuned your answer is

Question 34

Error-

Answer 34

When the answer or ending is not correct or when an experiment fails through the work of the scientist making a mistake

Question 35

significant figures-

Answer 35

are digits that carry meaning contributing to its measurement resolution

Question 36

Absolute zero-

Answer 36

the lowest possible temperature where nothing could be colder and no heat energy remains in a substance

Question 37

Kelvin-

Answer 37

A measurement of temperature

Question 38

Density-

Answer 38

the result when you divide mass over volume

Question 39

Weight-

Answer 39

How much mass an object has