# Chemstry Ch -1 at Coastline

## 31 terms

### SI

International System of Units

### Purpose fo the SI

Provides uniformity for units used in science.

### Meter

Length, 39.4 inches just longer than a yard

### Centimeter

1/100 of a meter or 2.54 cm to an inch.

### Liter

Volume, slightly larger than a quart or 1.06 quart.

### Gram

Weight, 1000g = 1kg = 2.20 lb

### Celcius

Temperature, 0c = 32f = freezing; 100c = 212f = boiling.

### Kelvin

Lowest obtainable temperature is 0K, Kelvin (K)

### Length

metric = meter (m)
SI= meter (m)

### Volume

metric = liter (L)
SI = Cubic Meter (m^3)

seconds (s)

### Scientific Notation

a method of writing very large or very small numbers by using powers of 10

### Two parts of scientific notation:

Coefficient and power of ten.

### Measured numbers

Numbers obtained from a measurement that have some degree of uncertainty or error.

### SIgnificant figures

The digits in a measured number that include all certain digits and the first uncertain digit.

### Exact numbers

numbers that have no uncertainty; numbers from defined relationships, counting numbers, and numbers that are part of reduced simple fractions.

### tera

T 1,000,000,000,000 or 10^12

### giga

G 1,000,000,000 or 10^9

### mega

M 1,000,000 or 10^6 note the use of upper case"M" for mega while a lower case "m" for mili

k 1,000 or 10^3

d 0.1 or 10^-1

c 0.01 or 10^-2

### mili

m 0.001 or 10^-3 note the lower case "m" for mili where as mega uses upper case "M"

### micro

μ 0.000001 or 10^-6

### nano

n 0.000000001 or 10^-9

### pico

p 0.000000000001or 10^-12

### Conversion factor

Every equality can be written in the form of a fraction, in which one of the quantities is the numerator and teh other is the denominator.

mass/volume

### Density of solids and liquid is generaly expressed as:

grams per cubic centimeter, or g/cm^3

### Density of gases is usually expressed as:

grams per liter, or g/L

### Specific gravity

ratio of a mineral's weight compared with the weight of an equal volume of water.