Intro To Chemistry

Question 0

Chemistry is often called….?

Answer 0

The central science.

Most of the phenomena that occur in the world around us involve chemical changes, changes where one or more substance become different substances.

*understanding most other fields of science requires an understanding of chemistry.

Question 1

Define Chemistry

Answer 1

Science that deals with the materials of the universe and the changes that these materials undergo.

Question 2

Define Quantitative

Answer 2

1) that is or may be estimated by quantity.
2) of or related to the describing or measuring of quantity.

Quantitative=Measurements

Question 3

Define Qualitative

Answer 3

Relating to, measuring, or measured by the quality of something rather than the quantity.

Question 4

Define The Scientific Method

Answer 4

A process of studying natural phenomena

Involves:
•making observations
•forming laws and theories
•testing theories by experimentation

Question 5

Define Law

Answer 5

A generally observed behavior
*w/out explanation as to why the behavior occurs.

*while experimenting we may observe the same behavior all the time, and therefore can predict this behavior will always occur in the future

Question 6

Define Theory

Answer 6

A set of assumptions put forth to explain some aspect of the observed behavior of matter

*may need to modified or discarded as new info (observations) becomes known

Question 7

What is the difference between laws and theories?

Answer 7

• Laws predict what will happen

* Theories explain why something happens

Question 8

Notes:

Solving problems using a scientific approach

Answer 8

1) Define the problem
* Gather Info
- Facts, observations

2) Propose Solutions
* Organize information and look for patterns
* Hypotheses

3) Evaluate your proposed solutions
* Test your patterns by using them to predict what will happen
* Experiments

Question 9

EXAMPLES of chemical changes

Answer 9

• Emissions from a power plant lead to the formation of acid rain
• Wood burns in air; forming water, carbon dioxide, and other substances
• A plant grows by assembling simple substances into more complex substances
• The steel in a car rusts
• Eggs, flour, sugar, and baking powder are mixed and baked to yield a cake
• The definition of the term chemistry is learned and stored in the brain
• Grape juice ferments to form wine