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Types of Chemical Reactions-Inquiry Activity (KJ)

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Recognizing patterns allows us to predict future behavior. Weather experts use patterns to predict dangerous storms so people can get their families to safety. Political analysts use patterns to predict election outcomes. Similarly, chemists classify chemical equations according to their patterns to help predict products of unknown but similar chemical reactions.
Question 1
1.

The chemical equations in Model 1 contain the phase notations (s), (l), (g), and (aq). Match each symbol with its meaning.

Draggable itemarrow_right_altCorresponding Item
Dissolved in water
arrow_right_alt
(aq)
liquid
arrow_right_alt
(l)
solid
arrow_right_alt
(s)
gas
arrow_right_alt
(g)
Question 2
2.

Based on the examples provided, which set(s) of reactions in Model 1 typically involve ions in solution?

Question 3
3.

Based on the examples provided, which set(s) of reactions in Model 1 typically involve gases and/or solids?

Question 4
4.

Categorize the following as elements or compounds:

  • 2NaBr (aq)
  • MgCO3 (s)
  • S8 (s)
  • 4 Fe (s)
  • 3 O2 (g)
  • 3 H2 (g)
  • H2O (l)
  • 2 Fe2O3 (s)
  • Elements
  • Compounds
Question 5
5.

Which of the following would be classified as "ionic compounds dissolved in water"?

Question 6
6.

Match each description below to one of the reaction sets

Draggable itemarrow_right_altCorresponding Item
Ionic compounds dissolved in water switch partners
arrow_right_alt
Set D
Part of an ionic compound is removed and replaced by a new element
arrow_right_alt
Set B
One compound breaks into elements or smaller compounds
arrow_right_alt
Set A
Two or more elements or compounds combine to form one product
arrow_right_alt
Set C
Question 7
7.

Define the following term in your own words: Synthesis

Question 8
8.

Define the following term in your own words: Decomposition

Question 9
9.

Define the following term in your own words: Replacement

Question 10
10.

The four sets of chemical reactions shown in Model 1 have the following general names. Decide which name belongs to which set of chemical reactions.

Draggable itemarrow_right_altCorresponding Item
Synethsis
arrow_right_alt
Set A
Decomposition
arrow_right_alt
Set D
Single Replacement
arrow_right_alt
Set B
Double Replacement
arrow_right_alt
Set C
Question 11
11.

FeCl3 + Zn --> Fe + ZnCl2
Which of the following is a PRODUCT for the reaction above?

Question 12
12.

Can two elements be used as reactants for a synthesis reactions? If yes, give at least one example from Model 1 to support your answer.

Question 13
13.

Can two compounds be used as reactants for a synthesis reaction? If yes, give at least one example from Model 1 to support your answer.

Question 14
14.

What types of substances (elements or compounds) are seen in the products of decomposition reactions? Use examples from Model 1 to support your answer.

Question 15
15.

In single replacement reactions, do any of the atoms change their charge? If yes, use an example from Model 1 to describe the changes that take place.

Hint: When an element is all alone, it has a charge of zero. It only has a charge when it is in a compound.

Question 16
16.

In double replacement reactions, do any of the atoms change their charge? Use an example from Model 1 to support your answer

Question 17
17.

Choose one example from the set of synthesis reactions in Model 1. Write the chemical reaction in reverse.

(Make the products the reactants)

Question 18
18.

For the reaction your wrote in reverse for the previous question, what type of reaction is it now?

Question 19
19.

Classify the following reaction:
K2O (s) + H2O (l) --> KOH (aq)

Question 20
20.

Classify the following reaction:
2MgCl2 (aq) + Na2CO3 (aq) --> 2NaCl (aq) + MgCO3 (s)

Question 21
21.

Classify the following reaction:
2Al2O3 (s) --> 4Al (s) + 3O2 (g)

Question 22
22.

Classify the following reaction:
Cu(NO3)2 (aq) + Zn(s) → Cu(s) + Zn(NO3)2 (aq)

Question 23
23.

Classify the following reaction:
H2SO4 (aq) + 2NaOH(aq) → Na2SO4 (aq) + 2H2O(l)

Question 24
24.

Classify the following reaction:
2K(s) + 2H2O(l) → 2KOH(aq) + H2 (g)

Question 25
25.

Classify the following reaction:
2O2 (g) + N2 (g) → N2O4 (g)

Question 26
26.

Classify the following reaction:
2NaF(s) → 2Na(s) + F2 (g)

New Fun Fact! There are seven elements who are labeled as "diatomic". These seven elements can never be alone with only one atom, instead they will always be found in a pair if they are not in a compound. The seven elements are Hydrogen (H2), Nitrogen (N2), Oxygen (O2), Fluorine (F2), Chlorine (Cl2), Bromine (Br2), and Iodine (I2).

For example, you have seen the synthesis of water as 2H2 + O2 --> 2 H2O. The reason you cannot just say H2 + O --> H2O is because both oxygen and hydrogen are diatomic elements.
A student writes the following incorrect chemical equation for the synthesis of magnesium oxide:
Mg + O2 → MgO2

Another student writes the following incorrect synthesis reaction:
Mg + O → MgO
Question 27
27.

What is the correct formula for magnesium oxide? Hint: Magnesium oxide is an ionic compound.

Question 28
28.

What is the correct formula for the element oxygen? Hint: Think about the new fun fact you learned!

Question 29
29.

A student writes the following incorrect chemical equation for the synthesis of magnesium oxide:
Mg + O2 → MgO2
Explain why this student is incorrect.

Question 30
30.

A student writes the following incorrect chemical equation for the synthesis of magnesium oxide:
Mg + O → MgO
Explain why this student is incorrect.

Question 31
31.

Write the correct balanced chemical equation for the synthesis of magnesium oxide.

Question 32
32.

Put the following ions in the correct group

  • F
  • Li
  • Br
  • Na
  • OH
  • Forms a cation
  • Forms an anion
Question 33
33.

A student writes the following incorrect chemical equation for a single replacement reaction between lithium bromide and fluorine.
2LiBr(aq) + F2 (g) → 2Li(s) + 2FBr(g)
In a single replacement reaction, part of an ionic compound is removed and replaced by a new element. What element will fluorine replace in lithium bromide? Hint: What is the most common ionic form of fluorine?

Question 34
34.

A student writes the following incorrect chemical equation for a single replacement reaction between lithium bromide and fluorine.
2LiBr(aq) + F2 (g) → 2Li(s) + 2FBr(g)

What is wrong with the student’s prediction of the products in the above reaction?

Question 35
35.

Predict the products for the single replacement reaction between lithium bromide and fluorine.

Question 36
36.

Write the correct balanced equation for the single replacement reaction between lithium bromide and fluorine.

Question 37
37.

What is the charge of sodium?

Question 38
38.

What is the charge of bromide?

Question 39
39.

What is the formula for iron (III) bromide?

Question 40
40.

What is the formula for sodium bromide?

Question 41
41.

A student writes the following incorrect chemical equation for a double replacement reaction between iron(III) bromide and sodium hydroxide solutions.
FeBr3 (aq) + NaOH(aq) → FeOH(s) + NaBr3 (aq)

What is wrong with the chemical formula(s) of the product(s) predicted by this student?

Question 42
42.

A student writes the following incorrect chemical equation for a double replacement reaction between iron(III) bromide and sodium hydroxide solutions.
FeBr3 (aq) + NaOH(aq) → FeOH(s) + NaBr3 (aq)

Write the correct balanced equation for the double replacement reaction between iron(III) bromide and sodium hydroxide.