Chemistry chapter 1 Flashcards


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created 9 years ago by bryanbalducki
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1

molecule

smallest particle of pure substance that is capable of a stable independent existence

2

atoms

particles that make up molecules

3

matter

anything that has mass or takes up space

4

mass

measurement of the amount of matter in an object.

Object in Earth has same mass as on the moon.

5

weight

a measurement of the gravitational force acting on an object

6

physical properties of matter

can be observed without changing the composition

7

chemical properties of matter

can be observed only by attempting to change the matter into new substances

8

compounds

pure substances that are made up of 2 or more heteroatomic molecules or individual atoms.

9

elements

pure substances made up of homoatomic molecules or individual atoms of the same kind

10

Difference between law and theory

a law describes what nature does under certain conditions and will predict what will happen as long as those conditions are met. A theory explains how nature works.

11

kinetic energy

energy in motion

12

potential energy

energy an object has due to its position

13

multiplying scientific notation: (a x 10y)(b x 10z)=

=(a x b)(10y+z)

14

scientific notation division: (a x 10 y )

(b x 10z) =

(a/b) (10y-z)

15

scientific notation addition:

adding and subtracting exponential expressions MUST have like terms

16

significant figures

leading 0s are never significant figures

17

exact numbers

numbers that have no uncertainty

18

1 m/x cm

1 m/100 cm

19

precision

how close a series of measurements are to one another

20

accuracy

how close the measure value is to the actual value