Scientific Measurements

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. They include all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal part.

Front

How many significant figures are in the number 0.0045?

Back

2 significant figures.

Front

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

Calculate the density of a substance with a volume of 5.0 mL and a mass of 45.3 g.

Back

Density = 45.3 g / 5.0 mL = 9.06 g/mL.

Front

What is the SI base unit of length?

Back

The SI base unit of length is the meter.

Front

What is the SI unit for mass?

Back

The SI unit for mass is the kilogram.

Front

What is the process of rounding?

Back

Rounding is the process of adjusting the digits of a number to make it simpler while keeping its value close to what it was.

Front

Round the number 12,678.56 to one significant figure.

Back

10,000.

Front

What is the rule for rounding numbers?

Back

If the digit to the right of the rounding digit is 5 or more, round up. If it is less than 5, round down.

Front

Calculate 23 x 678.0 and round to the correct significant figures.

Back

23 x 678.0 = 15,594, rounded to 16,000.