CHM 101 Exam 2

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): __FeCl3 + __NaOH --> __Fe(OH)3 + __NaCl

1 3 1 3

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): ___N2+___H2 --> ___NH3

1 3 2

How many core electrons are in a chlorine atom? Hint see larger group number.

10

What is the angle between electron groups if they have tetrahedral geometry?

109.5 degrees

Acetylene gas (C2H2) is produced as a result of the following reaction. CaC2(s) + 2H2O(l) -> C2H2(g) + Ca(OH)2(aq) If 3.20 moles of CaC2 are consumed in this reaction, how many grams of H - 2O are needed?

115 g H2O

C3H8 + 3O2 -> 3CO2 + 4H2 How many moles of oxygen are necessary to react completely with 4.0 moles of propane (C3H8)?

12 moles of oxygen

If we have the following equation: 1 cup flour + 2 eggs + 1/2 tsp baking powder---> 5 pancakes How many pancakes can we make with 3 cups of flour? Express your answer as a number only

15

How many valence electrons are in sulfur dioxide?

18

Mg(s) + 2HCl(aq) -> MgCl2(aq) +H2(g) How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

183 g HCl

How many electrons can exist in an orbital?

2

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): __NaBr + __CaF2 --> __NaF + __CaBr2

2 1 2 1

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): __NaCl + __F2--> __NaF + __Cl2

2 1 2 1

Zn + 2HCl -> ZnCl2 + H2 How many moles of hydrogen are produced from the reaction of 3.0 moles of zinc with an excess of hydrochloric acid?

3.0 moles of hydrogen

K3PO4 + Al(NO3)3 -> 3KNO3 + AlPO4 How many moles of potassium nitrate are produced when 2.5 moles of potassium phosphate react?

7.5 moles potassium nitrate

Fill in the Blanks The Lewis structure of oxygen should have ___________ valence electrons. Express your answer as a number.

8

2KClO3 -> 2KCl + 3O2 How many moles of oxygen are produced by the decomposition of 6.0 moles of potassium chlorate?

9.0 moles of oxygen

Why don't the noble gases bond very often? These do bond but are typically exceptions to normal rules. They have 2 valence electrons so have a filled shell. They have 8 total valence electrons so have a filled shell. A and C. B and D.

A and C.

Solid aluminum reacts with gaseous chlorine. If you begin with 0.552 mol of aluminum and 0.887 mol of chlorine, what is the limiting reactant and theoretical yield of the product in moles?

Al, 0.552molAlCl3

Which of the following statements about Lewis structures is FALSE? An octet is when an atom has 8 valence electrons. A covalent bond occurs when electrons are shared. All of the above statements are true.

All of the above statements are true.

Lewis theory predicts that the formula for a compound between barium and sulfur:

BaS

Which element has the highest electron affinity?

C

Which of the following answers shows a complete and balanced equation showing the combustion of propane (C3H8)?

C3H8(g) + 5O2(g) -> 3CO2(g) +4H2O(l)

For the following reaction, determine what the products of this reaction will be. When you have predicted the products, balance the equation and use a table of solubility products to determine which of the products (if any) will precipitate. Assume all reactions take place in water. __Ca(OH)2(aq) + __HF (aq) ->

Ca(OH)2(aq) + 2HF(aq) -> 2H2O(l) + CaF(s) (CaF2precipitates)

What is the complete name of the most electronegative element in the periodic table?

Flourine

What is unique about nitrogen gas?

Forms a triple bond.

Which of the following answers shows a complete and balanced equation showing the reaction of nitric acid with potassium hydroxide?

HNO3(aq) +KOH(aq) -> KNO3(aq) +H2O(l)

Classify the following reaction: 3HBr(aq) + Al(OH)3(aq) -> 3H2O(l) + AlBr3(aq)

acid-base

Fill in the Blanks The following reaction: HCl(aq) + KOH(aq) -> KCl(aq) + H2O is an ________ reaction.

acid-base

2HCl(aq) + K2S(aq) -> H2S(g) + 2Kcl(aq) What type of reaction is this? End your answer with the word reaction.

acid-base reaction

Classify the following reaction: 2NH3(aq) + H2SO4(aq) -> (NH4)2SO4(aq)

synthesis

What is the molecular geometry of CCl4?

tetrahedral

What is the molecular geometry if you have 3 single bonds and 1 lone pair? Answer as a word only-may be more than one word.

trigonal pyramidal

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): __C8H18 + __O2 --> __CO2 + __H2O

2 25 16 18

How many valence electrons are in the nitrate ion?

24

Write a balanced chemical equation for the following description:Aluminum metal reacts with copper (II) chloride to produce aluminum chloride and copper metal.

2AL + 3CuCl2 --> 2AlCl3 + 3Cu

Write the ionic equation for Iron II chloride and magnesium metal.

2Fe3+(aq) +6Cl-(aq) + 3Mg(s) -> 3Mg2+(aq) +6Cl-(aq) +2Fe(s)

Write the molecular equation that show the reaction of Iron III chloride with magnesium metal.

2FeCl3(aq) +3Mg(s) -> 3MgCl2(aq) +2Fe(s)

For the following reaction, determine what the products of this reaction will be. When you have predicted the products, balance the equation and use a table of solubility products to determine which of the products (if any) will precipitate. Assume all reactions take place in water. __ NaC2H3O2 + __H2SO4 ->

2NaC2H3O2(aq) + 1H2SO4(aq) --> Na2SO4(aq) +2CH3COOH(aq) (noprecipitate)

Review the photosynthesis reaction: 6CO2(g) + 6H2o(l) -> 6O2(g) + C6H12O6(aq) How many grams of glucose can be synthesized from 58.5 g of CO2? Assume there is more than enough water present to react with all of the CO2. Express your answer as a number only with three sig figs.

39.9

For the following reaction, determine what the products of this reaction will be. When you have predicted the products, balance the equation and use a table of solubility products to determine which of the products (if any) will precipitate. Assume all reactions take place in water. __Cu(OH)2 + __H3PO4 -->

3Cu(OH)2(aq) + 2H3PO4(aq) --> 6H2O(l) + Cu3(PO4)2(s)

Fill in the Blanks Balance the following equation by filling in the blanks (use a 1 if needed): __P + __O2 --> __P2O5

4 5 2

Sodium chloride forms in this reaction between sodium and chlorine. How many moles of NaCl result from the complete reaction of 3.4 moles of Cl2? Assume that there is more than enough Na. Express your answer as a number with two sig figs only.

6.8

How many valence electrons are in a chlorine atom?

7

Lewis theory predicts that the formula for a compound between flourine and calcium is:

CaF2

Please show the net ionic equation for the reaction of Copper II chloride with silver acetate.

Cl-(aq) +Ag(aq) -> AgCl(s)

Using the reaction of 2Na(s) + Cl2(g) -> 2NaCl(s) If we have 53,2 g Na and 65.8 g of Cl2 , what is the limiting reactant? Answer by writing the word for the product (not the formula).

Cl2

Which of the following atoms is the largest?

Cs

Please show the ionic equation of the reaction of Copper II chloride with silver acetate.

Cu2+(aq) +2Cl-(aq) +2Ag+(aq) +2C2H3O2 - (aq) -> Cu2+(aq) +2C2H3O2-(aq)

Fill in the Blanks The molecular equation that shows the reaction of Copper II chloride with silver acetate is ______________ Please show states of matter in parentheses and depict ---> to show the reaction.

CuCl2(aq) + 2AgC2H3O2(aq) ---> Cu(C2H3O2)2(aq) + 2AgCl(s)

Lewis theory predicts that the formula for a compound between potassium and sulfur is:

K2S

Which of the following elements have the least metallic character?

Li

How is metallic character defined?

Metallic character is defined as how readily an atom can lose an electron.

Which of the following atoms have the following electron configuration 1s22s22p63s1?

Na

Identify the reactant(s) in the following reaction: 2KClO3 --> 2KCl + 3O2

Potassium Chlorate KClO3

In this type of reaction, two aqueous compounds produce a solid product.

Precipitation

Which of the following elements have the lowest ionization energy?

Rb

Classify the following reaction: Magnesium and oxygen gas produce magnesium oxide

Redox

For covalent compounds, how does polyatomic ions typically impact these structures?

They add the amount of electrons needed.

How are the patterns seen in the periodic table for ionization energy and electron affinity related?

They both have the same trends seen.

Refer to the following chemical equation to answer this question: H2 + O2 -> 2H2O Explain this in words.

Two hydrogen atom combine with one oxygen molecule to produce two water molecules.

Which of the following is considered a single group of electrons? single bond double bond triple bond all of these

all of these

Classify the following reaction: 4C5H9O(aq) + 27O2(g) -> 20Co2(g) + 18H20(l)

combustion

Fill in the Blanks The following reaction: CH4 + 2O2 -> CO2 + 2H2O is a ______________reaction.

combustion

The Lewis structure for oxygen gas includes which of the following?

double bond

Classify the following reaction: 2NaBr(aq) + Ca(OH)2(aq) -> CaBr2(aq) + 2NaOH(aq)

double replacement

What other reaction types can an acid-base reaction also be?

double replacement Precipitation

Fill in the Blanks Neon has _________ valence electrons. Enter the word.

eight

Which of the following show evidence of a chemical reaction?

formation of gas

What is the molecular geometry of carbon dioxide?

linear

What does l refer to when placing phases within a chemical equation?

liquid

Fill in the Blanks The following reaction: AgNO3(aq) + KCl(aq) -> AgCl(s) + KNO3(aq) is a _____ reaction.

precipitation

What type of reaction does the following statement describe? electrons are transferred from one substance to another

redox

What type of bond does bromine gas have?

single bond

Classify the following reaction: 3Pb(s) + 2H3PO4(aq) -> 3H2(g) + Pb3(PO4)2(s)

single replacement

Classify the following reaction: Calcium and hydrochloric acid produce calcium chloride and hydrogen gas

single replacement

Classify the following reaction: magnesium metal reacts with hydrochloric acid to form aqueous magnesium chloride and hydrogen gas

single replacement

The central atom in the chlorate anion, ClO3- is surrounded by:

three bonding and one unshared pair of electrons

The central atom in the chlorate anion, ClO2- is surrounded by:

two bonding and two unshared pairs of electrons