Chemistry Notes 1

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Wax and sand form

A heterogeneous mixture

Air is

A homogeneous mixture

Chlorofluorocarbons (CFCs) are a type of industrial chemical. It was noted in the 1980s that as the production of CFCs increased, damage to the earth's ozone layer increased. With this information, classify the statement, "CFCs damage the ozone layer."

A hypothesis

What is the most helpful thing in a chemistry course

Practicing problems

What is the freezing point of pure water?

0C

The state of matter that has a definite volume and rigid shape is called

A Solid

Table salt is

A compound

Which of the following is a possible explanation for a set of observations?

A hypothesis

"What goes up must come down" is an example of a scientific

A law

A quantitative observation is known as

A measurement

Strawberries taste sweet is

A qualitative observation

Some large cars get 3.2 fewer miles per gallon than some small cars is

A quantitative observation

Which of the following is a probable explanation for a set of observations or a set of tested hypotheses?

A theory

When a compound called an acid is mixed with a compound called a base, a reaction always occurs. Thus, the statement, "acids react with bases" is an example of a scientific

Law

Melting is the process by which a solid becomes a

Liquid

__________ is the fundamental measure of how much matter is present.

Mass

One cubic centimeter is equal to one

Milliliter

Matter is composed of atoms is an example of a scientific

Model

Is sweeping the floor a chemical process?

No

Is a phase change chemical or physical?

Physical

Is this a chemical or physical property of phosphorous "Is a white, waxy solution."?

Physical

A successful chemistry student will

Practice solving problems

Chemistry is a(n) _______ science.

experimental

Chemistry deals with

both the nature of and the changes in materials

What does the prefix mega- mean?

10^6

The simplest pure substance is called

An element

What do we call a test to gather more information to support or discredit a hypothesis?

An experiment

Which of the following is another name for a scientific test?

An experiment

Chemistry is often called the __________ science because it involves the study of the materials in the universe and the changes these materials undergo.

Central

A _____ change alters the identity of the materials.

Chemical

Is a reaction chemical or physical?

Chemical

Is copper turning green when exposed to air a chemical or physical property?

Chemical

Silver forming a dark coating of tarnish is a _____ change and is a_____ property of silver.

Chemical, chemical

By definition, a mixture has variable

Composition

When baking a cake, the baking soda (NaHCO3), in the recipe is converted to sodium carbonate, carbon dioxide, and water. Baking soda is a(n)_____ and undergoes a_______ change during the baking process.

Compound, chemical

If you had a homogeneous mixture of ethyl alcohol and water, what method would you use to obtain pure ethyl alcohol?

Distillation

What is a common method for separating solids from liquids?

Filtration

Densities may be expressed in

Grams per milliliter.

Filtration can be used to separate

Heterogeneous mixtures

The scientific approach of critical thinking is useful in resolving many of our everyday problems. In proper order, critical thinking involves

Hypothesis, experiment, and observation

What is the SI unit for measuring temperature?

Kelvin

Chemistry is a science that is useful to everyone since it is used in many different occupational areas.

True

True or false, A heterogeneous mixture has different types of particles and its composition is different in different regions.

True

True or false, Nitrogen takes the shape and volume of it's container.

True

Is this a hypothesis "A car weighs 3,756 lb."?

Yes


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