1st Six Weeks Chemistry Re-Test

Which of the following is not a chemical change?

• freezing of water

• rusting iron

• mixing two clear liquids together and the liquid changes to purple

• burning a piece of cedar wood

Which of the following is a basic unit of mass in the metric system?

• centimeter (cm)

• grams (g)

• milliliter (mL)

• meter (m)

A sample of element X contains 90% abundance and 35 amu, 8.0% abundance and 37 amu, and 2.0% abundance and 38 amu. The average atomic mass is closest to -

• 32 amu

• 35 amu

• 37 amu

• 39 amu

In atom, all three subatomic particles play a very important role. Which of the subatomic particles has to do with the identity of the atom and is different for every single element?

• Protons

• Neutrons

• Electrons

• Neutrinos

Based on the chemical symbol for the isotope of Aluminum, how many neutrons would this isotope have?

• 27

• 14

• 13

• 40

What does this lab safety symbol represent?

• Caution/Hazardous

• Electrical Safety

• Toxic Safety

• Fume Safety

What is the purpose of the following piece of lab equipment?

• To record the volume of a gas

• To record the volume of a liquid

• To heat up liquids over a bunsen burner

• Used to hold liquids for titration

An object with a mass 7.5 g raises the level of water in a graduated cylinder from 25.1 mL to 30.1 mL. What is the density of the object?

• 1.5 g/mL

• 2 g/mL

• 1.0 g/mL

• 3.2 g/mL

Pure gold has a density of 19.32 g/cm³. What would be the volume of a piece of gold be if it had a mass of 318.97 g?

• 16.51 cm³

• 2.02 cm³

• 16.51 g/cm³

• 2.02 g/cm³

What is the correct number of protons, neutrons, and electrons for an atom of Zinc?

• 35 protons / 35 electrons / 35 neutrons

• 30 protons / 35 electrons / 35 neutrons

• 30 protons / 30 electrons / 35 neutrons

• 30 protons / 35 electrons / 30 neutrons