Key to Pre Lab 5 - Chemistry Laboratory | Trường Đại học Quốc tế, Đại học Quốc gia Thành phố HCM

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Môn: Chemistry Laboratory (CH012IU)

Trường: Trường Đại học Quốc tế, Đại học Quốc gia Thành phố Hồ Chí Minh

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Tác giả:

Profile Mai Nguyệt
1
International University, Vietnam National University HCMC –
CHEMISTRY LABORATORY
Instructor: Ngo Nguyen Tien Dat, MSc
KEY TO PRE-LAB 5 FACTORS AFFECTING REACTION RATE –
1. What does the rate of a chemical reaction describe? How can the rate of a
chemical reaction be determined? (5 pts)
- The rate of a chemical reaction describes how fast the reaction occurs. (2.5 pts)
- The rate of a reaction can be determined by measuring the time of a certain amount of
a reactant reacted or a product formed. (2.5 pts)
2A. What are the factors that can affect the rate of a chemical reaction? (5 pts)
- the nature of the reactants
- temperature of the reaction
- concentration of the reactants
- the surface area of the reactants
- the presence of a catalyst
- the pressure of the reaction system.
2B. What is a catalyst? Will a catalyst be consumed in a chemical reaction? (5 pts)
- A catalyst is a substance that can speed up the rate of a chemical reaction. (2.5 pts)
- A catalyst will not be consumed in a chemical reaction. (2.5 pts)
2
3A. A test tube was prepared by combining the following reagents: 10 mL (NH
4
)S
2
O
8
0.1 M, 5 mL Na
2
S
2
O
3
0.005 M, 4 mL starch, 10 mL KI 0.2 M. Calculate the
concentration of (NH assuming that the reaction have not occurred. Show
4
)S
2
O
8
your work for full credit. (5 pts)
Total volume of reagents in the test tube:
(1.5 pts)
The number of moles of (NH in the test tube:
4
)S
2
O
8
(1.5 pts)
The concentration of (NH
4
)S
2
O
8
in the test tube:
(2 pts)
3B. A test tube was prepared by combining the following reagents: 10 mL (NH
4
)S
2
O
8
0.1 M, 5 mL Na
2
S
2
O
3
0.005 M, 4 mL starch, 10 mL KI 0.2 M. Calculate the
concentration of assuming that the reaction have not occurred. Show your work KI
for full credit. (5 pts)
Total volume of reagents in the test tube:
(1.5 pts)
The number of moles of KI in the test tube:
(1.5 pts)
The concentration of in the test tube: KI
(2 pts)
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International University, Vietnam National University HCMC – CHEMISTRY LABORATORY
Instructor: Ngo Nguyen Tien Dat, MSc
KEY TO PRE-LAB 5 FACTORS AFFECTING REA – CTION RATE
1. What does the rate of a chemical reaction describe? How can the rate of a
chemical reaction be determined? (5 pts)
- The rate of a chemical reaction describes how fast the reaction occurs. (2.5 pts)
- The rate of a reaction can be determined by measuring the time of a certain amount of
a reactant reacted or a product formed. (2.5 pts)
2A. What are the factors that can affect the rate of a chemical reaction? (5 pts) - the nature of the reactants - temperature of the reaction
- concentration of the reactants
- the surface area of the reactants - the presence of a catalyst
- the pressure of the reaction system.
2B. What is a catalyst? Will a catalyst be consumed in a chemical reaction? (5 pts)
- A catalyst is a substance that can speed up the rate of a chemical reaction. (2.5 pts)
- A catalyst will not be consumed in a chemical reaction. (2.5 pts) 1
3A. A test tube was prepared by combining the following reagents: 10 mL (NH4)S2O8
0.1 M, 5 mL Na2S2O3 0.005 M, 4 mL starch, 10 mL KI 0.2 M. Calculate the
concentration of (NH4)S2O8 assuming that the reaction have not occurred. Show
your work for full credit. (5 pts)
Total volume of reagents in the test tube: (1.5 pts)
The number of moles of (NH4)S2O8 in the test tube: (1.5 pts)
The concentration of (NH4)S2O8 in the test tube: (2 pts)
3B. A test tube was prepared by combining the following reagents: 10 mL (NH4)S2O8
0.1 M, 5 mL Na2S2O3 0.005 M, 4 mL starch, 10 mL KI 0.2 M. Calculate the
concentration of KI assuming that the reaction have not occurred. Show your work for full credit. (5 pts)
Total volume of reagents in the test tube: (1.5 pts)
The number of moles of KI in the test tube: (1.5 pts)
The concentration of K in the test tube: I (2 pts) 2