Chemistry Concepts and Conversions Quiz

A neutral atom has 8 protons and 8 electrons. How many neutrons does this atom have if its mass number is 16?

• 6

• 8

• 10

• 12

A substance is placed in a container with no lid. Over time, the substance spreads to fill the entire container. What state of matter is this substance in?

• Solid

• Liquid

• Gas

• Plasma

You have a mixture of sand and water. How would you classify the matter?

• Element

• Compound

• Homogeneous mixture

• Heterogeneous mixture

When a piece of paper is burned, it turns into ashes and releases smoke. What type of change is this?

• Physical change

• Chemical change

• Reversible change

• Phase change

How many significant figures are in the number 0.00507?

• 2

• 3

• 4

• 5

Write 0.00092 in scientific notation.

Convert 2500 milliliters (mL) to liters (L).

• 0.25 L

• 2.5 L

• 25 L

• 250 L

A metal object has a mass of 200 grams and a volume of 50 cm³. What is its density?

• 2 g/cm³

• 3 g/cm³

• 4 g/cm³

• 5 g/cm³

Convert 100°F to Celsius.

• 32°C

• 37.78°C

• 40°C

• 45°C

How many protons, neutrons, and electrons are there in an atom of calcium (Ca) with a mass number of 40 and an atomic number of 20?

• 20 protons, 20 neutrons, 20 electrons

• 20 protons, 18 neutrons, 20 electrons

• 18 protons, 20 neutrons, 18 electrons

• 20 protons, 22 neutrons, 20 electrons