Quick questions for chemistry

Test Preparation SAT Subject Test Preparation
1

<p>Just doing some review before tomorrow's test, so please give a helping hand :)</p>

<p>1.
A fluoride ion, F-, and an oxide ion, O2-, have the same diameter
(The - and 2- are oxidation numbers)</p>

<p>BECAUSE</p>

<p>the fluoride ion, F-, and the oxide ion, O2-, have the same number of electrons.</p>

<p>The answer is F, T. I understand why the second statement is true, but how can I determine the diameter of F- and O2-?</p>

<p>2.
A 1 mol sample of electrons is required to reduce 0.5 mol of chlorine gas to chloride ions</p>

<p>BECAUSE </p>

<p>chlorine molecules are diatomic and the charge on the chloride ion is -1.</p>

<p>Answer: T, T, CE. Need help with this as well...</p>

<p>3.
A 1 M sucrose solution and a 1 M NaCl solution have the same freezing point</p>

<p>BECAUSE</p>

<p>a 1 M sucrose solution and a 1 M NaCl solution contain the same number of solute particles per liter of solution.</p>

<p>Answer: F, F. Explainnnnnnn</p>

<p>4.
In 0.1 M acetic acid, [H+] is smaller than [H+] is in 0.1 M hydrochloric acid</p>

<p>BECAUSE</p>

<p>a molecule of acetic acid contains more atoms than does a molecule of hydrogen chloride.</p>

<p>Answer: T,T. Someone definitely needs to explain this one.</p>

2

<p>1.Oxygen has more protons that pull the electrons in
2. Cl2 forms 2Cl^- ions. So you need 2 electrons for every one Cl
3. They have completely different structures and atomic masses
4. HCl is a strong acid so concentration (brackets are concentration) of H+ will be greater because strong acids dissociate completely and create more H+. It is true that acetic acid (CH3COOH or C2H6O2) has more atoms, but that has nothing to do with concentration of H+</p>