CSEC Integrated Science Paper 2 May/June 2014 - Free CXC Past Paper with Answers

Acids

Bases

Acid

Base

A student carried out an experiment to determine the pH of various substances and obtained the following information.

TABLE 2: pH OF SUBSTANCES

What does the term pH mean?

Which substance in Table 2 is NOT an acid?

Which of the two acids shown in Table 2 is stronger?

While painting the inside of her home, Ms Jones got her favourite red dress soiled with paint. Her son, Sam, suggested that she uses bleach to remove the paint from her dress.

Give TWO reasons why bleach is NOT the most appropriate substance for Ms Jones to use.

Suggest a suitable method that Ms Jones could use to remove the paint from her dress and explain how this method works.

State TWO safety precautions that can be taken when using the method stated in (d) (ii) above.

State which cell represents a plant cell.

Give TWO reasons for your answer in (a) (i) above.

Name the cell structure that is responsible for storing genetic information.

Name the type of cell that transports oxygen around the human body.

On a sunny day at an open market a vendor, Ms Milly, occasionally sprinkles water on her wilting lettuce. During the day Ms Milly’s lettuce are firm and ready for sale.

Distinguish between ‘diffusion’ and ‘osmosis’.

Identify the process that resulted in Ms Milly’s wilting lettuce becoming firm.

Explain how the process identified in (b) (ii) kept the lettuce firm.

Suggest a suitable method, other than sprinkling, that a consumer could use to keep the lettuce firm.

The digestive and circulatory systems consist of organs with muscles which are necessary for them to carry out their normal functions. Table 3 shows two organs and the possible effects of muscle damage on the structure and functioning of the organ and the overall effects on the body. Complete the table.

TABLE 3: EFFECT OF MUSCLE DAMAGE ON HEART AND STOMACH

Distinguish between a conductor and an insulator.

State ONE example of how a conductor is used in the kitchen and ONE example of how an insulator is used in the kitchen.

In a practical activity, Ryan was asked to connect three wires to the Live (L), Earth (E) and Neutral (N) contacts, in a three-pin plug. Complete Table 4 to show the colour of the wire that should be connected to EACH contact.

TABLE 4: COLOUR OF WIRE TO BE CONNECTED TO EACH CONTACT

A housewife wants to determine the weekly cost of using three appliances in her home. If one unit of electricity (kWh) costs 25 cents, calculate the cost when she uses the appliances. (All calculations are to be shown below.)

TABLE 5: APPLIANCES AND DAILY QUANTITY OF ELECTRICITY USED

State TWO ways in which energy can be conserved in the home.

List THREE components of air.

Identify TWO likely pollutants that would be present in EACH of the TWO communities.

For ONE of the pollutants identified in EACH community, describe the source of the pollutant and how it may be distributed in the environment.

Outline TWO effects that the pollutants identified for EACH community would have on organisms in the community.

Write your answer to Question 5 here.

Identify and describe briefly the THREE methods by which heat energy is transferred from one point to another.

Ravi wants to know which colour absorbs sunlight best so he uses five containers, each filled with a different coloured solution and a thermometer. He records the results in Table 6.

Outline a procedure that Ravi may have used to get the results in Table 6.

Describe TWO problems that may be faced by people who want to use solar energy in the Caribbean.