Chemistry Chapter 2 "Measurements and Calculations"

Question 1

Hypothesis

Answer 1

A testable statement

Question 2

Model

Answer 2

A model in science is more than a physical object; it is often an explanation of how phenomena occur and how data or events are related.

Question 3

Scientific Method

Answer 3

Is a logical approach to solving problems by observing and collecting data, formulation hypothesis, testing hypothesis, and formulating theories that are supported by data.

Question 4

System

Answer 4

Is a specific portion of matter in a given region of space that has been selected for study during an experiment observation.

Question 5

Theory

Answer 5

Is broad generalization that explains a body of facts or phenomen

Question 6

Conversion factor

Answer 6

Is a ration derived from the equally between two different units that can be used to convert from one unit to the other.

Question 7

Density

Answer 7

Is the ration of mass to volumen, or mass divided by volumne

Question 8

Derived unit

Answer 8

Combinations of SI base units

Question 9

Quantity`

Answer 9

Is something that has magnitude, size, or amount.

Question 10

SI

Answer 10

Le System International d’Unites–single standard measurement system used by scientist.

Question 11

Volume

Answer 11

Is the amount of space occupied by an object

Question 12

Weight

Answer 12

Is a measure of the gravitational pull on matter

Question 13

Accuracy

Answer 13

Refers to the closeness of measurements to the correct or accepted value of the quanity measured.

Question 14

Directly Proportional

Answer 14

Two quantities are directly proportional to each other if dividing one by the other gives a constant value.

Question 15

Percent error

Answer 15

Is caluclated by subtracting the experimental value from the accepted value, dividing the difference by the accpted, value, and then multiplying by 100.

Question 16

Precision

Answer 16

Refers to the closeness of a set of measurements of the same quanitity made in the same way.

Question 17

Scientific notation

Answer 17

Number are written in the form M x 10 to the n power, where the factor M is a number greater than or equal to 1 but less thant 10 and n is a whole number.

Question 18

Significant figures

Answer 18

In a measurement consist of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated.