Midterms

Question 1

What does the first law of motion mean?

Answer 1

If an object was still, it will remain still.

If an object was moving, it will keep moving.

It takes force to change the motion of an object.

Question 2

What must happen to show that mass is preserved?

Answer 2

There must be the same amount of elements on both sides of an equation.

Question 3

What are the prefixes and their values in the metric system?

(greatest to least)

Answer 3

Kilo Hecto Deca Base Beci Centi Milli

Question 4

What is a mass number?

Answer 4

of neutrons = mass # - atomic #

Question 5

What is an atomic number?

Answer 5

The number of protons in an atom

Question 6

True or false?

The atom contains a nucleus

Answer 6

True

Question 7

Question

Answer 7

First in the order of Scientific Method

Ask a question about something you observe. Has to be testable and not opinion based.

An observation can be any of the five senses.

Question 8

Research

Answer 8

Second in the order of Scientific Method

Research what is already known about your question. It may already be answered.

Question 9

Hypothesis

Answer 9

Third in the order of Scientific Method

Educated guess about the answer. Allows you to make a prediction about the outcome.

Question 10

Experiment

Answer 10

Fourth in the order of Scientific Method\

Designed to test your hypothesis. Fair test, should be able to be reported.

Question 11

Collect Data

Answer 11

Fifth in the order of Scientific Method

Take notes of data + observations. Never make data fit hypothesis. Use correct units of measurement.

Question 12

Analyse

Answer 12

Sixth in the order of Scientific Method

Organizing data in charts and/or graphs.

Question 13

Conclusion

Answer 13

Seventh in the order of Scientific Method

The step whether you find out whether your hypothesis is correct.

Question 14

Report

Answer 14

Eighth in the order of Scientific Method

Communicate to other scientists about your findings whether they were right or wrong.

Question 15

Variable

Answer 15

A word used to describe a quantity or condition that can change.

Question 16

Independent Variable

Answer 16

The factors as you as a scientists change during the experiment

What you have control over in the experiment.

Question 17

Dependent Variable

Answer 17

Factors you observe or measure.

What you do not have control over in the experiment.

Question 18

Controlled Variable (Constants)

Answer 18

Factors that need to remain unchanged during an experiment so they don’t influence the outcome or affect the results.

Question 19

What are the three base units?

Answer 19

Meter, gram, and liter

Question 20

Convert 2.5 milligrams to kilograms

Answer 20

0.0000025 kilograms

Question 21

Convert 6 hectometers to centimeters

Answer 21

50,000 centimeters

Question 22

Convert 7.8 deciliters to liters

Answer 22

0.78 liters

Question 23

Mean

Answer 23

Computed by adding all the numbers in the data together and dividing by all the numbers in the data set.

Question 24

Median

Answer 24

First reorder the data set from smallest to greatest. The median is the element in the middle of the data set. If there are two numbers in the middle, add those two numbers up and divide them by two.

Question 25

Mode

Answer 25

The number that appears most in the data set

Question 26

What are the columns called on the periodic table and how many are there?

Answer 26

Called a group or family, and there are 18 columns.

Question 27

What are the rows called on the periodic table and how many are there?

Answer 27

Called a period, and there are seven of them.

Question 28

What is the zigzag line for on the periodic table?

Answer 28

It is there to separate the metals and the non-metals (also called the staircase).

Question 29

What are the elements touching the staircase called on the periodic table?

Answer 29

Metalloids - they have properties of both solids and metals.

Aluminum is not a metalloid even though it touches the staircase. It is a metal.

Question 30

Astronomers theorize that billions of years ago, the universe formed in a huge, cosmic _________.

Answer 30

Explosion

Question 31

What are the two pieces of evidence that confirm the Big Bang Theory?

Answer 31

1. The fact that galaxies are constantly moving
2. Cosmic background radiation