25/26 Sci 6A 5.8 - 5.11

What do all the elements in Group 3 have in common? (5.8)

• They are all metalloids.

• They are all nonmetals.

• They are all rare earth elements.

• They are all metals.

Which of these elements is a metal? (5.8)

• He

• Cl

• Cu

• B

Which of these is the best conductor of electricity? (5.8)

• As

• Ag

• He

• N

Which of these elements that is necessary for life is a metal? (5.8)

• Carbon

  C

• Oxygen

  O

• Hydrogen

  H

• Calcium

  Ca

The mirrors on the Webb telescope are made from beryllium (Be). What is a disadvantage of working with this material? (5.8)

• It is a weak metal.

• It is rare.

• • 
    

    It is a poor conductor of heat.

• It is a heavy metal.

A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components:

• one red ball

• two black balls

• six white balls

• eight sticks

• What do the black balls in the model represent? (5.9)

• oxygen atoms

• carbon atoms

• hydrogen atoms

• bonds between atoms

Use the model of a molecule to answer the question.

How many atoms of carbon does this molecule have? (5.9)

• 6 atoms

• 4 atoms

• 1 atom

• 2 atoms

Which term describes the repeated arrangement of the same molecule? (5.9)

• bonds

• extended structure

• molecular model

• atoms

Use the table to answer the question.

Color of Atom in Molecular Model

Which option correctly describes a model of methanol, CH₃OH? (5.9)

• two red spheres, four white spheres

• one blue sphere, four white spheres, one red sphere

• one gray sphere, three white spheres, one red sphere, one blue sphere

• one gray sphere, four white spheres, one red sphere

Which describes the characteristics of solid? (5.10)

• A solid has a fixed volume, but the shape changes.

• A solid has a fixed shape, but the volume changes.

• A solid has a fixed shape and volume.

• A solid has a volume and shape that both change.