chem test.txt

kg

m(to the third)

K

mole

d=m/v

% error=accepted value - experimental value/accepted value x 100

relitive error=your largest density - your smallest density/your average density x 100

the measurement of how close a measurement comes to the accepted/true value of whatever is being measured. It's compared to the true/accepted value.

a measure of how close a series of measurements are to another. It's two or more repeated measurements.

Accuracy

Precision

When taking any measurement, the number of sig. figs. is equal to the number of divisions on the measurement device, plus one more digit that is estimated.

• 1. Every non-zero digit is significamt
• 2. Zeros between non-zero digits are significant
• 3. Leftmost zeros infront of non-zero digits are not significant
• 4. With digits to the right of a decimal point, zeros to the right of the last non-zero digit are significant
• 5. If there is no decimal point, zeros to the left of the implied decimal point and before a non-zero digit ane not significant

then there an unlimited number of significant digits.

addition subtraction=decimal points (not digits) as the measurement with the least number of decimal places.

multiplication division=significant digits as the measurement with the least number of sig. figs.

• If number next to number to be rounded is 5 or greater, round up and vise versa.
• Example: 245.6 (only want 2 sig. figs.) = 250

The specific gravity of a substance is a comparison of its density to that of water (1 mL). It's unit less.

The ability of an object to float in a liquid. The buoyancy is determined by specific gravity.

K=C+273

C=K-273

• 1. Add 40
• 2. Conversion units factor (9 F/5 C)
• 3. Subtract 40