Chemistry Notes 1
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