Chapters 1 & 2 GAC Chemistry

Front

What are significant figures?

Back

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

Front

How many significant figures does the number 0.002570 have?

Back

4

Front

How do you convert micrograms to kilograms?

Back

To convert micrograms to kilograms, divide the number of micrograms by 1,000,000 (1 kg = 1,000,000 µg).

Front

Convert 543 micrograms to kilograms.

Back

0.000543 kg

Front

What is the formula for density?

Back

Density = Mass / Volume.

Front

An object is placed in a graduated cylinder and the water level rises from 50 mL to 60 mL. What is the volume of the object?

Back

The volume of the object is 10 mL.

Front

If the mass of an object is 20 grams and its volume is 10 mL, what is its density?

Back

Density = 20 g / 10 mL = 2 g/mL.

Front

What is the density of an object with a mass of 10 grams and a volume of 5 mL?

Back

2 g/mL

Front

What is scientific notation?

Back

Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form. It is written as a number between 1 and 10 multiplied by a power of 10.

Front

Which answer correctly shows 18934000 in scientific notation?

Back

1.8934 x 10^7