2 trang 56 lượt tải

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

112

Key to Pre Lab 5 - Chemistry Laboratory | Trường Đại học Quốc tế, Đại học Quốc gia Thành phố HCM được sưu tầm và soạn thảo dưới dạng file PDF để gửi tới các bạn sinh viên cùng tham khảo, ôn tập đầy đủ kiến thức, chuẩn bị cho các buổi học thật tốt. Mời bạn đọc đón xem!

Môn: Chemistry Laboratory (CH012IU) 59 tài liệu

Trường: Trường Đại học Quốc tế, Đại học Quốc gia Thành phố Hồ Chí Minh 696 tài liệu

Tác giả:

Profile

Mai Nguyệt

1 năm trước
Danh sách Quiz
/2
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)

Tài liệu khác của Trường Đại học Quốc tế, Đại học Quốc gia Thành phố Hồ Chí Minh

Preview text:

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

Tài liệu liên quan: