Prelim Chemistry Revision

A nonpolar molecule may contain polar bonds

• True

• False

Which of the following molecules is trigonal pyramidal?

• H2_S

• PF₃

• SO₃

• CCl₄

Flourine has a .............................. atomic radius than potassium

If Uranium-230 decays to Thorium-226, what kind of radiation has been released

• Gamma

• Alpha

• Beta

• Positron

Which allotrope of Carbon conducts electrcity?

• Diamond

• Graphite

• Buckyballs

What type of bonding is present in Ca(NO₃)₂?

• Ionic

• Metallic

• Covalent

• Ionic and covalent

The bonds within caesium oxide are?

A silicon chip has a mass of 7.02 g. How many moles of silicon is this?

• 4.00

• 2.00

• 5.00

• 0.250

Consistent or uniform solutions are

• Orderly

• Disorderly

• Homogenous

• Heterogeneous

Calculate the percent by mass of silver in silver nitrate

• 107.9%

• 8.2%

• 63.5%

• 28.3%