intro to chemistry

INTRO TO

CHEMISTRY

Get started!

Which of the following is NOT matter?

SMOKE

SAND

AIR

LIGHT

VERY GOOD!!

Light is a form of energy and energy is NOT matter!

LIGHT

Next QuestionBack to the question

INCORRECT

Try again…

Which of the following is NOT one of the three physical states of

matter?Solid

Gas

Aqueous

Liquid

Very good!

Solid, liquid, and gas are the three physical states of matter

Aqueous

Next QuestionBack to the question

INCORRECT

Try again…

Which of the following best describes carbon monoxide (CO)?

Element

Heterogeneous mixture

Homogeneous mixture

Compound

Very Good!

Carbon monoxide (CO) is a compound. It is made up of two or more elements

CHEMICALLY combined.

Compound

Next QuestionBack to the question

INCORRECT

Try again…

Salt water is an example of a…

Element Compound

Homogeneous mixture

Heterogeneous mixture

Very good!

Salt water is an example of a homogeneous mixture. The mixture looks uniform

throughout. However, it is a mixture because both the salt and the water maintain their original properties and can be physically

separated.

Homogeneous mixture

Next QuestionBack to the question

INCORRECT

Try again…

Which of the following CANNOT be broken down into a simpler

substance?

Carbon (C)Juice

Oil and water

Sodium chloride (NaCl)

Very Good!

Carbon is an element. Elements cannot be broken into simpler substances.

Sodium chloride is a compound, oil and water is a heterogeneous mixture, and juice is a

homogeneous mixture. All three of these can be broken into simpler substances.

Carbon (C)

Next QuestionBack to the question

INCORRECT

Try again…

The following are observations of what happens when two solutions are mixed. Which is NOT evidence that a chemical reaction has

occurred?

There is fizzing and bubbling

One of the solutions

was yellow to

start

The test tube feels

hotter

A solid forms

Very Good!

Production of a gas (seen by the fizzing and bubbling), energy released (the test tube felt hotter), and the formation of a solid are all

evidence that a chemical reaction has occurred.

One of the solutions

was yellow to

start

Next QuestionBack to the question

INCORRECT

Try again…

Which of the following is an example of a chemical change?

Breaking a pencil in half

Salt dissolving in water

The corrosion of metal

Grinding garlic

Very good!

Remember in a chemical change…something NEW is produced

The corrosion of metal

Next QuestionBack to the question

INCORRECT

Try again…

Phase changes are an example of a…

Chemical change

Physical change

Chemical property

Extensive property

Very good!

A phase change is only a change in state of mater so it is a physical change.

Physical change

Next QuestionBack to the question

INCORRECT

Try again…

What would be the correct symbol for when solid salt (NaCl) is melted?

NaCl (l)

NaCl (g)

NaCl (aq)

NaCl (s)

Very good!

When salt is melted it becomes a liquid.

Remember that a liquid is different than an aqueous solution. An aqueous solution is made when a solid is dissolved in water.

NaCl (l)

Next QuestionBack to the question

INCORRECT

Try again…

Mercury is a silver colored liquid. The silver color of mercury is an example of a ….

Extensive physical property Physical change

Intensive physical propertyChemical property

Very good!

Intensive properties to not depend on the amount of a substance.

Extensive properties DO depend on the amount of a substance…like mass or length

Intensive physical property

Next QuestionBack to the question

INCORRECT

Try again…

What is true about the following reaction:

A (s) + B (aq) C (g) + D (aq)

C and D are reactants

D is a solid

A and B produce solid products

A and B are reactants

Very good!

A chemical reaction has this general form:

Reactants Products

A and B are reactants

Next QuestionBack to the question

INCORRECT

Try again…

SCIENTIFIC

NOTATION

& SIG FIGS

Get started!

How do you write 0.00560 in scientific notation?

5.60 x 10-3 0.560 x 10-2

56.0 x 10-4 5.60 x 1030.560 x 102

Very good!

Remember that when writing a number in scientific notation, there should be ONE

number to the LEFT of the decimal. Since the number is less than 1, the exponent should be

negative.

5.60 x 10-3

Next QuestionBack to the question

INCORRECT

Try again…

3.6 x 105 could be also written as…

3600000

0.360000

0.000036

0.00036

360000

Very good!

Since the exponent is positive, your decimal should be moving to the right.

360000

Next QuestionBack to the question

INCORRECT

Try again…

How many sig figs are in the 0.0003005600?

10 3 711 4

Very good!

Remember that zeros in front of a number are placeholder zeros and are NOT significant.

Terminating zeros to the right of the decimal are significant. Any zero in between

significant numbers is significant

7

Next QuestionBack to the question

INCORRECT

Try again…

How many sig figs are in the 70800000?

3

4

8

2

Very good!

Remember that zeros after a number but before the decimal are placeholder zeros and are

NOT significant. Any zero in between significant numbers is significant

3

Next questionBack to the question

INCORRECT

Try again…

What is the correct answer to the following problem:7.815 + 2.07 =

9.885

9.88

9.89

9.9

Very good!

7.815 + 2.07 = 9.885When adding or subtracting two numbers, your

answer should have the same number of decimal places as the measurement with the least number of decimal places. 2.07 has two

decimal places so your answer should be rounded to 9.89

9.89

Next QuestionBack to the question

INCORRECT

Try again…

CLOSE! But not quite correct…don’t forget about rounding!

Try again…

What is the correct answer to the following problem:

8.670 x 0.54 =

4.682

4.684.6818

4.7

Very good!

8.670 x 0.54 = 4.6818When you multiply or divide two numbers your

answer should have the same number of total sig figs as the answer with the fewest sig figs. 0.54 has two sig figs so your answer should be

rounded to 4.7

4.7

Done!Back to the question

INCORRECT

Try again…

Great Job! Good luck on your quiz!

Back to the start

I’m in chemistry

I’m in honors

chemistry

Chemistry

• Don’t forget to also study how to record a measurement with the correct number of significant figures

• Finish the quiz review given in class for homework due Monday.

Back to the start

Honors Chemistry

• Half of your quiz will be on the information in the presentation, the other half will be on dimensional analysis

• Don’t forget that the three dimensional analysis worksheets are due on Monday

Back to the start