Choose the correct response for each of the following questions.  

1.  Which type of reaction is NaOH + HCl à NaCl + H₂O?

a) Synthesis

b) Decomposition

c) Single displacement

d) Double displacement

2.  Protons are

a) positively charged particles found outside the nucleus in an atom.

b) negatively charged particles found outside the nucleus of an atom.

c) neutral particles found in the nucleus of an atom.

d) positively charged particles found in the nucleus of an atom.

3.  An atom with an atomic number of 38 and a mass number of 88 contains:

a) 50 neutrons

b) 50 electrons

c) 38 neutrons

d) 88 protons

4.  A liquid with a pH of 6 is:

a) neutral

b) very acidic

c) very basic

d) weakly acidic

5.  Find the missing mass for the following equation:

2Mg + O₂ à 2MgO

mass of magnesium metal = 45.2 g         

mass of magnesium oxide = 66 g

mass of oxygen = ?