Unit 4 Practice Exam

Find the density of a rectangular prism with a mass of 140.67 grams. The sides of the prism are 6cm, 12cm, and 3 cm.

• 0.65 g/cm3
• 1.54 g/cm3
• 1.27 g/cm3
• 0.98 g/cm3

Which characteristics describe all organic compounds? Choose TWO correct answers.

• The compound must contain a metal.
• Electrons are shared by the atoms.
• The compound must contain carbon.
• Electrons are transferred between atoms.
• They are found in nonliving things only.

The diagram shows a model of an atom. Atoms contain three different subatomic particles. Which statement best describes the outermost particle?

• Particle A exists outside the nucleus.
• Particle A has a negative charge.
• Particle A does not contribute to an atom’s mass.
• All of the above are correct.

Which subatomic particles have no electrical charge and may not always be the same in number as the protons?

• electrons
• neutrons
• atoms
• nucleus

If an oxygen atom has a mass number of 16, how many neutrons are in the atom?

• 5
• 6
• 7
• 8

In a neutral atom, the number of protons and electrons are as follows:

• more protons than electrons
• equal
• more electrons than protons
• need more information

What is the number of protons?

• 10
• 11
• 12
• 13

Which of the following is an example of a compound?

• helium (He)
• sodium (Na)
• carbon dioxide (CO2)
• iron (Fe)

What is the name of this atom?

• Cesium
• Carbon
• Calcium
• Chlorine

Which statement about molecules is true?

• Molecules are always composed of only one type of atom.
• Molecules are the smallest unit of an element that keeps its chemical properties.
• Molecules are formed by atoms bonding together.
• Molecules cannot be represented by chemical formulas.