Chem Unti Test 1

Front 1

Precision

Back 1

The exactness of a value

the more significant digits that can be recorded the more precise

Precision is also related to the closeness of each trial

range is used to calculate Percision

Range is = highest trial value - lowest trial value

Front 2

Accuracy

Back 2

How close a measurement is to expected value if there is more than one child the results are averaged the average (experimental value) is compared to an expected value

Front 3

Significant digits

Back 3

The numbers you record when you take a measurement

The more the numbers the more exact value is

Front 4

Adding/subtracting measured values

Back 4

When adding and subtracting measured values the answer must have the same number of decimal places as the measured meaning the lowest decimal places in the question

Front 5

Supplying/dividing measurements

Back 5

When multiplying/dividing the answer has the same number of significant digits as the measurement with the fewest number of significant digits in the question

Front 6

Significant digits rule

Back 6

Zeros that appear after death my point and follow after a nonzero digit are always significant

Front 7

Significant digits rule

Back 7

Zeros between two nonzero digits are always significant

Front 8

Significant digits rule

Back 8

Zeros used need a space to decimal are never exact like 300

Front 9

Chemistry

Back 9

Chemistry is the study of matter and its composition chemistries of the study of what happens when matter interact with other matter

Front 10

Energy changes

Back 10

Adding energy to matter or removing energy from matter results in change

Front 11

Change of state

Back 11

I change your state alters the appearance of matter

Front 12

Chemical change

Back 12

Changes at all to the composition of matter like I am resting what burning and bread baking

Front 13

Physical change

Back 13

Changes that affect the physical appearance of matter but not its composition like changes in color and texture

Front 14

Elements

Back 14

An element is a pure substance that cannot be separated chemically into any simpler substances like copper zinc hydrogen and oxygen

Front 15

Matter

Back 15

Anything that has mass and volume takes up space

Front 16

Properties

Back 16

Examples of properties include physical state color Oder texture boiling temperature density inflammability

Front 17

Physical properties

Back 17

A property that you can observe without changing one kind a matter into something new

Front 18

Chemical properties

Back 18

A property that you can observe one one kind of matter is converted into a different kind of matter

Front 19

Qualitative properties

Back 19

Can we describe but not measured numerically

Front 20

Quantitative properties

Back 20

Can be measured and express numerically