SABIS Chemistry Grade 9 Quiz Week 5

In the words of your book, what is an experiment?

An experiment is a(n) ............ sequence of observations.

• controlled

• uncontrolled

What is the temperature at which a pure substance melts called?

• Boiling point

• Melting point

• Evaporation point

• End point

What other name can be given to Melting point

• Boiling point

• Melting point

• Freezing point

• Condensation point

Given a sample of a pure waxy solid, which of the following is not a physical constant?

• The melting point of this solid

• Its freezing point

• Its density

• Its mass.

What are the

states of matter?

• Compound

• Solid

• liquid

• Gas

Explain what each letter and digit means in the expression 3 H2SO4.

• 3 separate molecules of H2SO4, each molecule containing 3 atoms of hydrogen, 1 atom of

  sulphur and 4 atoms of oxygen chemically bonded together.

• 3 separate molecules of H2SO4, each molecule containing 2 atoms of hydrogen, 1 atom of

  sulphur and 3 atoms of oxygen chemically bonded together.

• Total 2 atoms of hydrogen, 1 atom of

  Sulphur and 4 atoms of oxygen

• 3 separate molecules of H2SO4, each molecule containing 2 atoms of hydrogen, 1 atom of

  sulphur and 4 atoms of oxygen chemically bonded together.

Read this equation in words: 2 H2 + O2 → 2 H2O.

• Two atoms of hydrogen react with one atom of oxygen to give 2 atoms of water.

• Two molecules of hydrogen react with one molecule of oxygen to give 2 molecules of water.

• Two moles of hydrogen react with one mole of oxygen to give 2 moles of water.

• Two volumes of hydrogen react with one volume of oxygen to give 2 volumes of water.

What is the atomicity of: Ne

What is the atomicity of: NO

What is the atomicity of: HCl