Properties of Matter Pretest

Which of the following best describes why the electrons remain in the atom?

• A membrane hold the atom together

• A strong force holds them in place

• An electrical attraction exists between the negative protons and positive electrons

• An electrical attraction exists between the positive protons and negative electrons

Which of the following combinations represents Phosphorus-32?

• 15 protons, 15 neutrons, 15 electrons

• 15 protons, 17 neutrons, 15 electrons

• 15 protons, 32 neutrons, 17 electrons

• 15 protons, 17 neutrons, 17 electrons

Tags

NGSS.MS-PS1-1

According to the table below, which of the following substances will float in water

(density= 1.00 g/cm3)?

Densities of Common Substances

Substance Density

Wood (oak) 0.85 g/cm3

Aluminum 2.7 g/cm3

Silver 10.5 g/cm3

Lead 11.3 g/cm3

• aluminum

• lead

• silver

• wood

Which of the following is not true for the element represented below?

• The element is an alkali metal

• The element has one electron in the third energy level

• The element is found in group 1A

• The element is found in period 4

Tags

NGSS.MS-PS1-1

A self-warming packet can be used to warm hands during cold weather. Powdered iron (Fe) reacts with oxygen (O₂) when the packet is exposed to air. With the addition of a salt catalyst, Fe₂O₃ (iron oxide) is quickly formed and heat is given off.

4Fe + 3O₂ → 2Fe₂O₃

Which term BEST describes iron oxide?

• Compound

• Element

• Ion

• Mixture

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student observes a substance that is highly reflective and able to conduct electricity. The substance also has a high melting point. Which is the MOST likely classification for this substance?

• salt

• glass

• metal

• plastic

What do any two samples of the element mercury (Hg) have in common?

• the same mass

• the same volume

• the same type of atoms

• the same number of electrons

A student added 10 mL of sodium chloride, NaCl, to 100 mL of water and then stirred the mixture until the salt was no longer visible. Which of the following BEST describes the mixture?

• Sodium chloride is the solute, water is the solvent, and salt water is the solution.

• Sodium chloride is the solute, salt water is the solvent, and water is the solution.

• Water is the solute, sodium chloride is the solvent, and salt water is the solution.

• Water is the solute, salt water is the solvent, and sodium chloride is the solution.

Isotopes of an element have

• the same number of neutrons

• the same number of protons

• a different number of protons

• a different number of electrons

The isotope carbon-14 has

• 6 neutrons

• 7 neutrons

• 8 neutrons

• 7 protons