Atomic Structure Review

Front

What is the atomic number of potassium?

Back

19

Front

How do you calculate the number of neutrons in an isotope?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is the mass number of potassium-40?

Back

40

Front

What is density?

Back

Density is the mass of an object divided by its volume (Density = Mass/Volume).

Front

If an object has a density greater than 1 g/ml, what will it do in water?

Back

It will sink.

Front

What is the unit of density commonly used in chemistry?

Back

g/ml (grams per milliliter).

Front

How do you convert grams to milliliters using density?

Back

Volume (ml) = Mass (g) / Density (g/ml).

Front

What is significant figures?

Back

Significant figures are the digits in a number that contribute to its precision.

Front

How many significant figures are in the number 3.20?

Back

3 significant figures.

Front

What is the volume of an object that weighs 3.2 grams and has a density of 2.70 g/ml?

Back

1.185 ml, rounded to 1.2 ml.