Final Exam- The Last 30!

Which of the following elements is a member of the halogen family and located in period 3

• argon (Ar)
• chlorine (Cl)
• bromine (Br)
• sulfur (S)

In which of the following lists are the elements shown in order of increasing electronegativity?

• Li, Be, O, F
• O,F, Be,Li
• F, Li, O, Be
• Li, F, Be, O

Which of the following statements explains why elements of the alkali metal family are highly reactive?

• Alkali metals are easily ionized.
• Alkali metals are negatively charged.
• Alkali metals have an odd number of protons.
• Alkali metals have an odd number of electrons.

An element located at Group 18, Period 4 would be classified as which type of substance?

• a halogen
• a lanthanoid
• a metalloid
• a non metal

Which of these elements is the most chemically reactive?

• zinc (Zn)
• potassium (K)
• iron (Fe)
• germanium (Ge)

Which molecule represents an element?

• bromine gas (Br₂)
• carbon dioxide (CO₂)
• hydrogen fluoride (HF)
• sodium chloride (NaCl)

Which chemical property places neon (Ne) and argon (Ar) in the same group?

• Both elements form ionic compounds.
• Both elements have a full outer energy level.
• Both elements have a low ionization energy.
• Both are liquids at 38 ⁰C.

Sodium (Na) metal reacts violently with water to form hydrogen gas. Which element has a similar reaction when combined with water?

• gold (Au)
• lithium (Li)
• silicon (Si)
• zinc (Zn)

Which equation shows that the total mass during a chemical reaction stays the same?

• 1
• 2
• 3
• 4

__ NH₃(g) + __ O₂(g) --> ___N₂(g) + ___ H₂O (g)
When the reaction above is completely balanced, the coefficient for NH₃ will be? 

• 2
• 3
• 4
• 6