chem midterm vocab

Question 1

Scientific method

Answer 1

Is a systematic approach used in a scientific study

Question 2

Qualitative data

Answer 2

Information that describes the color, odor, shape, or any other physical characteristic

Question 3

Quantitive data

Answer 3

numerical information that describes how small, how big, how tall, how fast something is

Question 4

Hypothesis

Answer 4

a testable statement or prediction about what has been observed

Question 5

Experiments

Answer 5

is a set of controlled observations that test the hypothesis

Question 6

Independent variable

Answer 6

Is the variable you plan to change

Question 7

Dependent variable

Answer 7

Its value changes depending on the change in the independent variable.

Question 8

Control

Answer 8

is standarad for comparision

Question 9

Conclusion

Answer 9

judgment based on the information obtained

Question 10

Theory

Answer 10

Is an explanation of a natural phenomenon based on many observations and investigations over time

Question 11

Scientific law

Answer 11

nature that is supported by many experiments

Question 12

Base unit

Answer 12

is a defined unit in a system of measurement that is based in an object or event in the physical world.

Question 13

Derived unit

Answer 13

A unit that is described by the combination of base units.

Question 14

Dimensional analysis

Answer 14

Shows how close a measured value is to an accepted value

Question 15

Precision

Answer 15

Refers to how close a series of measurements are to one another

Question 16

Error

Answer 16

the difference between an experimental value and an accepted value.

Question 17

percent error

Answer 17

express error as a percentage of the accepted value