Runnels/Agbobock Spring Final Exam 2019

Which set of procedures and observations indicates a chemical change?

• Large crystals are crushed with a mortar and pestle, and the crystals become a powder

• A cool, shiny metal is added to water in a beaker, and rapid bubbling occurs.

• Ethanol is added to an empty beaker, and the ethanol eventually disappears.

• A solid is gently heated in a crucible, and the solid slowly turns to a liquid.

Which statement describes a chemical property of iron?

• Iron can be flattened into sheets.

• Iron conducts electricity and heat.

• Iron can be drawn into a wire.

• Iron combines with oxygen to form rust.

The atomic mass of titanium is 47.88 atomic mass units. This atomic mass represents the-

• weighed average mass of the most abundant isotope of Ti.

• total mass of all the protons and neutrons in an atom of Ti.

• total mass of all the protons, neutrons, and electrons in an atom of Ti.

• weighted average mass of all the naturally occurring isotopes of Ti.

Which value of an element is calculated using both the mass and the relative abundance of each of the naturally occurring isotopes of the element?

• Atomic number

• Molar volume

• Atomic mass

• Half-life

A compound is made up of iron and oxygen, only. The ratio of iron ions to oxide ions is 2:3 in this compound. The IUPAC name for this compound is-

• iron (III) oxide.

• triiron dioxide.

• iron trioxide.

• iron (II) oxide.

What is the IUPAC name for the compound Mg(OH)₂ commonly found in antacids?

• Manganese dihydroxide

• Magnesium hydroxide

• Magnesium dihydroxide

• Manganese hydroxide

What is the correct name for Fe₂O₃

• Iron (I) oxide

• Iron (III) oxide

• Iron (II) oxide

• Iron (V) oxide

What is the correct formula for ammonium carbonate?

• NH₄CO₃

• NH₄(CO₃)₂

• (NH₄)₂CO₃

• (NH₄)₂(CO₃)₂

What is the name for NaClO₃?

• Sodium perchlorate

• Sodium chlorite

• Sodium chloride

• Sodium chlorate

What is the correct formula for iron (II) bromide?

• Fe₂Br

• FeBr₂

• FeBrO₂

• Fe₂BrO₂