ASCHEM Unit 3 Rview

Write the reaction equation that occurs when strontium nitrate is strongly heated

When barium or its compounds are heated in oxygen they do not burn.

• True

• False

Compared with a molecule of HF, the bond energy of the HCl bond is ​ (a)   .

• lower
• higher
• longer
• faster

Which sodium salts form a precipitate when AgNO3 followed by dilute NH3(aq) is added to its aqueous solution?

• chloride

• bromide

• iodide

• nitrate

Which sodium salts form a precipitate when AgNO3 followed by concentrated NH3(l) is added to its aqueous solution?

• chloride

• bromide

• iodide

• acetate

Which is faster, the reaction of magnesium with cold water or strontium with cold water?

• magnesium

• strontium

Which is faster, the reaction of calcium with cold water or barium with cold water?

• calcium

• barium

A stone has been carved as a statue. The stone is made of CaCO3. The statue is suffering damage over time. What is the cause of this?

• sulfur dioxide from fossil fuels forming acid rain

• hydrocarbon emissions from motor vehicles

• increased temperature from global warming

• increased ultraviolet radiation as the ozone layer is destroyed

Draw a graph of the group 17 elements and their strengths of their van der waals forces.

Compared with the HBr molecule, the bond length of the HI molecule is ​ (a)   .

• longer
• shorter
• stronger
• vagrant