Chemistry Need to Know!! chem 1010

Mass

kg

time

sec

temp

K

To find Kelvin, what is the formula (converting Celcius to K)

K=C+273

Length

Meters

Amount

moles

Volume

cm³

Energy

joules

Mega

1,000,000 (10^6)

Kilo

1,000 (10³)

Deci

0.1 (10^-1)

Centi

0.01 (10^-2)

Milli

0.001 (10^-3)

Micro

0.000001 (10^-6)

Nano

0.000000001 (10^-9)

All non zero digits are significant? ex) 54.34

True

Zeros between non zero digits are significant, also known as interior figures? ex) 122001.3

True

Why is it when you go from a small number and make it larger you get a negative exponent?

Because in scientific notation, the negative exponent is showing you that the original value is smaller than the original value.

How do you do math for positive exponents?

Multiply by 10’s

How do you do math for a negative exponent?

Divide by 10’s

Trailing figures after a decimal point are significant? Ex) 132.00

True

Zeros at the end of a number without a written decimal point are ambiguous and should be avoided by using scientific notation. Ex) 95,000

True

What is the reason why we use sig figs?

We preserve precision by using sig figs when doing calculations. Helps to not claim false precision.

Group 1 on periodic table (name and charge)?

Alkaline Metals +1

Group 2 on the periodic table?

Alkaline earth metals +2

Group 13 on the periodic table?

Group 13, +3

Group 16 on the periodic table?

Chalcogens, -2

Group 17 on the periodic table?

Halogens -1

Group 18 on the periodic table?

Halogens, 0

When multiplying and dividing with sig figs, what number do you round to?

Round to least number of decimal places

When dividing and multiplying sig figs, what number do you round to?

Round to least number of sig figs.

Accuracy

How close you are to the average

Precision

How close the data is the each other

1m³=1000L