Quiz: The Chemistry of LIfe

If an atom contain 3 protons, 4 neutrons, and 3 electrons, its mass number is...

• 3

• 4

• 7

• 10

If an atom contains 11 protons & 12 neutrons, its atomic number is...

• 11

• 12

• 23

• 1

Which of the following make up a molecule of water?

• one atom of hydrogen

  one atom of oxygen

• one atom of sodium

  one atom of chlorine

• one atom of hydrogen

  two atoms of oxygen

• two atoms of hydrogen

  one atom of oxygen

A covalent bond is formed as the result of

• transferring electrons

• sharing electrons

• transferring protons

• sharing protons

Water molecules are polar, with the

• oxygen side being slightly positive and the hydrogen side being slightly negative

• oxygen and hydrogen sides being slightly positive

• oxygen and hydrogen sides being slightly negative

• oxygen side being slightly negative and the hydrogen side being slightly positive

If you stir salt into boiling water, you produce a

• mixture called a suspension

• mixture called a solution

• solution and suspension

• mixture only

A substance with a pH of 6 is called

• a weak acid

• a weak base

• a strong acid

• a strong base

Solutions that have more OH- than H+ ions are

• reactants

• acids

• bases

• enzymes

Why is carbon so special compared to other elements?

• Carbon atoms can bond to one another and form a lot of different structures.

• Carbon atoms have 4 valence electrons and can form quadruple bonds.

• Only carbon atoms can form covalent bonds with oxygen and hydrogen.

• Only carbon atoms can be dissolved in water solutions and suspensions.

Carbon-12 is the most common isotope of carbon. It has 6 protons, 6 neutrons, and 6 electrons. Of its 6 electrons, 4 are valence electrons. How many covalent bonds can a carbon atom form?

• 1

• 4

• 6

• 12