Ch 2 Vocab

Question 1

Scientific method

Answer 1

Logical approach to solving problems by observing and collecting data, formulating hypotheses, testing hypotheses, and formulating theories that are supported by data

Question 2

System

Answer 2

Specific portion of matter in a given region of space that has been selected for study during an experiment or observation

Question 3

Hypothesis

Answer 3

Testable statement

If-then statements

Question 4

Model

Answer 4

More than a physical object, often an explanation of how phenomena occur and how data or events are related

Question 5

Theory

Answer 5

Broad generalization that explains a body of facts or phenomena

Question 6

Quantity

Answer 6

Something that has magnitude, size, or amount

Question 7

SI

Answer 7

Le system international d’unites

Single measurement system scientists all over the world have agreed on

Question 8

Weight

Answer 8

Measure of the gravitational pull on matter

Question 9

Derived unit

Answer 9

Formed by combinations of SI base units

Question 10

Volume

Answer 10

Amount of space occupied by an object

Question 11

Density

Answer 11

The ratio of mass to volume, or mass divided by volume

Question 12

Conversion factor

Answer 12

Ratio derived from the equality between two different units that can be used to convert from one unit to the other

Question 13

Dimensional analysis

Answer 13

Mathematical technique that allows you to use units to solve problems involving measurements

Question 14

Accuracy

Answer 14

The closeness of measurements to the correct or accepted value of the quantity measured

Question 15

Precision

Answer 15

The closeness of a set of measurements of the same quantity made in the same way

Question 16

Percentage error

Answer 16

Calculated by subtracting the accepted value from the experimental value, dividing the difference, by the accepted value, and then multiplying by 100

Question 17

Significant figures

Answer 17

Consists of all the digits known with certainty plus one final digit, which is somewhat uncertain or is estimated

Question 18

Scientific notation

Answer 18

Numbers r written in the form M x 10 to the n’th power, where the factor M is a number greater than or equal to 1 but less than 10 and n is a whole number

Question 19

Directly proportional

Answer 19

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

Question 20

Inversely proportional

Answer 20

Two quantities are inversely proportional to each other of their product is constant