Chemistry Fall Exam 2025

Which statement best describes a mole?

• It is used mainly for writing chemical formulas.

• It is used for chemical equations that have reversible reactions.

• It is used for directly comparing the amounts of substances.

• It is used mainly for dealing with fluid substances.

Tags

NGSS.MS-PS1-5

Avogadro’s number was calculated by determining the number of atoms in

• 12.00 g of carbon-12.

• 14.00 g of carbon-12.

• 12.00 g of oxygen.

• 14.00 g of oxygen.

Which must be the same when comparing 1 mol of oxygen gas, O2, with 1 mol of carbon monoxide gas, CO?

• the mass

• the volume

• the number of molecules

• the number of oxygen atoms

What is the molar mass of fluorine, F2?

• 9.00 g/mol

• 18.00 g/mol

• 19.00 g/mol

• 38.00 g/mol

Tags

NGSS.MS-PS1-1

Which is the correct name of a compound that is formed by Si and O?

• silicon dioxide

• silicon trioxygen

• disilicon dioxygen

• monosilicon oxide

Tags

NGSS.MS-PS1-1

Which statement best describes the properties of metals?

• They are shiny and bend without breaking.

• They are dull and are good electrical insulators.

• They conduct electricity well and are brittle.

• They can be flattened and do not conduct heat well.

Which statement is true about ionic compounds?

• Which statement is true about ionic compounds?

• Ionic compounds have varying solubilities in water.

• Ionic compounds have very low melting points.

• Ionic compounds are very easy to bend.

Tags

NGSS.HS-PS2-4

Which element is classified as an alkali metal?

• Rb

• Sr

• Zr

• Cl

Which characteristic is given by the angular momentum quantum number?

orbital size

• Orbital size

• Orbital mass

• Orbital shape

• Orbital orientation

An element has six valence electrons available for bonding. Which group of the periodic table does this element most likely belong to?

• Group 2

• Group 4

• Group 16

• Group 18