UCE Chemistry Paper 1 (2025)
Scenario-Based Items
Section A - Items 1 and 2 are compulsory.
Section B - Part I: choose one of Items 3 or 4; Part II: choose one of Items 5 or 6.
Item 1
Section A (compulsory)
Scenario
When preparing chicken sauce for her family, Jane adds common salt only. However, when she visited a restaurant, Jane noted that the chicken sauce served to her contained onions, tomatoes and curry powder in addition to common salt.
Figure 1 shows some of the ingredients used in the preparation of chicken sauce in the restaurant. Jane was highly impressed by the restaurant sauce, which tasted much better than the one she prepares at home. She wants to know more about the ingredients used in the restaurant and has approached you for help.
Task
- (a)State the category of the ingredients and the function of each ingredient.
- (b)Describe the side effect(s) associated with the ingredients.
- (c)State the;
- (i)similarities of the ingredients.
- (ii)differences between the other ingredients and common salt.
Item 2
Section A (compulsory)
Scenario
Mary, a 60-year-old, complains of dental caries, joint pains and muscular cramps. During one of her visits to a hospital, the doctor advised her to drink water from a bore hole because it contains a compound that can solve her problems. Mary would like to know more about the compound and has approached you for assistance.
Your chemistry teacher told you that the compound is chemically written as XY2 (where X and Y are not the actual symbols of the elements). The teacher further informed you that X belongs to group II and period 4, while Y belongs to group VII and period 2 of the periodic table. Figure 2 shows a periodic table of the first 20 elements.
Task
- (a)Explain the nature of substances X and Y, and identify them.
- (b)Describe how X and Y form the compound.
- (c)Explain the properties of the compound.
- (d)How does the compound address Mary's complaints.
- (e)Write down one impact of having a lot of compound XY2 in the environment and how it can be mitigated.
Item 3
Section B, Part I (respond to only one item: 3 or 4)
Scenario
Chlorine is one of the disinfectants commonly used to kill micro-organisms that cause diseases. An investor has set up a chlorine manufacturing industry in an urban centre in Uganda. Figure 3 shows a chlorine manufacturing plant.
However, the population in the area have requested to be informed about the process leading to the production of chlorine, the economic and social benefits of the manufacturing plant and how any side effect(s) is/are mitigated. A radio talk show has been organised to address the request by the population and your school has chosen you as their representative.
Task
Write details of the key issues you will present during the talk show.
Item 4
Section B, Part I (respond to only one item: 3 or 4)
Scenario
Nitrogen is an essential nutrient for crops. Nitrates are one of the sources of nitrogen. A maize farmers' group in an area experienced poor yields in the past season, which was due to very low levels of nitrogen in the soil.
In response, government has authorized an investor to set up an ammonium nitrate manufacturing plant in the area as a source of nitrates. Aware of the merits and demerits of such a factory, your School Science Club wishes to write a sensitisation article in a daily newspaper. The article is to highlight production process of ammonium nitrate, the social and economic benefits of the plant to the community and how any side effect(s) is/are to be mitigated. You have been asked to prepare the article.
Task
Make a write-up of the article.
Item 5
Section B, Part II (respond to only one item: 5 or 6)
Scenario
A youth group has a washing bay along the river. As they wash vehicles, the waste water drains into the river.
When senior one students from a nearby school went for a chemistry study tour to river, they found the youth busy with their routine work. One of the students noticed that the water-body around the washing bay looked abnormal. The student expressed worry about the safety of the people around the river and drew the attention of the area local authority. In response, the local authority has called for a meeting with the youth. You have been selected to give a sensitisation talk.
Task
Write details of the key issues you will address during the sensitisation talk.
Item 6
Section B, Part II (respond to only one item: 5 or 6)
Scenario
Air is an important natural resource that should be conserved. There is improper waste management in some homes and schools involving open dumping and burning of garbage. These activities release toxic fumes into the atmosphere hence affecting the air quality. A head teacher has tasked the School Science Club to organise a sensitisation campaign aimed at mitigating the challenge. The theme of the campaign is Be an air quality champion. You have been chosen to speak to the rest of the students regarding the theme. Figure 4 shows rubbish being burnt in a residential area.
Task
Make a write-up of the message you will present.
Post a Comment