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Chemistry per 9

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Environmental Biology

on 6 May 2014

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Transcript of Chemistry per 9

Group 2
B- decomposition
Group 4
11. No
12a. H2SO4+H2O->SO3+H2O
Group 5
14.
a. MgO
b. O2
c. The first student kept the subscript of 2 by Oxygen when it should not have been there. Also, their equation was not balanced.
d. The second student did not recognize Oxygen as a diatomic. They also did not balance the equation.
e. 2Mg + O2 -> 2MgO
Group 1
1) aq, l, s, g
2) set A & D
3) set B & C
4) Set D, Set B, Set A, Set C
5) Synthesis- combining to make bigger.
Decomposition- breaking down
Replacement- using something in the place of something else
6) Set C Set A
Set D Set B
Group 3
15. A student writes the following incorrect equation for a single replacement reaction between lithium bromide and fluorine.
2LiBr(aq) + F2(g) -> 2Li(s) + 2FBr(g)
a.) 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?

Fluorine replaces Lithium
Chemistry per 9
"Types of Chemical Reactions"

Real World
In the real world, synthesis would be like combining many ingredients to create chocolate chip cookies. Decomposition would be like eating all of the cookies. Replacement could be shown by replacing the chocolate chips with M&M's.
What We Learned
We learned the different types of reactions (synthesis, decomposition, single replacement, double replacement).
15 continued
Summary
We learned the correct way to
write a chemical formula as well
as the incorrect way(s) to write
a chemical formula.
group 6
Answers to 17 and 18
17a) Synthesis
17b) P2O5+H2O->H3PO4
17c) P2O5+3(H2O)->2(H3PO4)
18a) 2Al+N2->2(AlN)
18b)2(N2O)->2N2+O2
18c)SrCl2+2(AgNO3)>2(AgCl)+Sr(NO3)2
18d)2Cr(NO3)3+3ZnCl2>3(Zn(NO3)2)+2(CrCl3)
18e)2Na+Cl2->2NaCl
18f)Zn+2HCl->ZnCl2+H2



Real world examples.
One example of reactions like these is the act of breathing
One example of reactions like these is the act of breathing and cellular respiration.
12b. decomposition
Summary of what we learned
13.S
SR
D
SR
DR
SR
S
D
We improved our balancing skills
and improved our ability to identify
different kinds of reactions in nature.
Real World
1. synthesis reaction:
rusting of iron= 4Fe+3O2->2Fe2O3

2. Decomposition reaction:
the production of quicklime=
Ca(OH)2->CaO+H2O

3.Single displacement:
silverware soaking with Al
2Al+3Ag2S->6Ag+Al2S3

Double displacement:
Magnesium from seawater
MgCl2+2NaOH->Mg(OH)+2NaCl
Summary
the difference between the
four types of chemical reactions.
Synthesis you add elements together to form a compound. Decomposition you break a compound apart into elements. Single Replacement one element on the reactant side changes places with another element on the product side. Double replacement two elements on each side change places.

Summary
These questions helped define the different types of chemical reactions. It also gave examples and showed what to look for when deciding between types.
b. What is wrong with the student's prediction in the above reaction?

Fluorine would go with Lithium, not Bromine.

c. Predict the products and write the correct balanced equation for the single replacement between lithium bromide and fluorine.

2LiBr + F2 -> Br2 + 2FLi
16. 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)
a.) What is wrong with the chemical formula(s) of the product(s) predicted by this student?

Bromide subscript shouldn't be 3 in NaBr3.
b.) Write the correct equation for the double replacement reaction between iron(III)bromide and sodium hydroxide.

FeBr3 + NaOH -> Fe(OH)3 + NaBr
16
Real World Example
A real world example of a single replacement would be if a couple went to a dance and another person went to the same dance alone. If one of the people from the couple switched with the person who is alone it would be like a single replacement.

AB + C -> A + BC
An example of a double replacement would be if two couples went to a dance and they switched partners during the dance.

AB + CD -> AC + BD
Summary
These two problems helped us improve our ability to balance equations. We learned you really have to watch the placement of the elements on the periodic table when you are balancing.
7. yes; 2H2 (s) + O2 (s) --> 2H20 (l)
8. yes; MgO (s) + H2O --> Mg(OH)2
9. elements and compounds may be formed.
10. yes; 2FeCl3 + 3Zn --> 2Fe + 3ZnCl2
11. no
12. A- 2Fe2O3 --> 4Fe (s) + 3O2
Real World Example
An example of a synthesis reaction is rusting iron.
4Fe + 3O2 --> 2Fe2O3
Real World
Magnesium Oxide is a
popular drying agent. It
can be used in or as dietary substances for humans and animals.Magnesium oxide is used as a refractory agent in the construction of crucibles (a crucible is a container which is intended to be placed in extremely hot temperatures.)
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