IGCSE Co-ordinated Science Semester 1 Revision Questions

The circuit shown contains a component X and two meters Y and Z in an electrical circuit. Which unit is used when stating the value of X, and which units are used when stating the readings on Y and Z?

An electrically charged student produces soap bubbles. When he holds his hand near the bubbles, they move away quickly from his hand. For this movement of the bubbles to happen, which statement is correct?

When a liquid evaporates, molecules escape from its surface and the temperature of the remaining liquid changes. Which row in the table shown is correct for the escaping molecules and for the temperature change of the remaining liquid?

The diagram shows a helium atom. Which particles in the helium atom have approximately the same mass?

Which diagram represents a single element?

The diagram shows the electrolysis of a dilute solution of copper( II ) chloride using inert electrodes. Which row shows the products formed at each electrode and describes the bonding in copper( II )chloride?

An element is a solid at room temperature and does not conduct electricity. What is the proton number of this element?

These are distance/time graphs. Which graph shows an object moving at constant speed?

Which statement about weight is correct?

A student pours liquid into a measuring cylinder. The student records the volume of the liquid from the scale on the measuring cylinder. He then puts the measuring cylinder containing the liquid on a balance and records the mass. What else needs to be measured before the density of the liquid can be calculated?

An electric motor is used to lift a container off a ship. The output power of the motor is changed by changing the time taken to lift the container and by changing the work done in lifting the container. Which row in the table shows changes that both increase the output power?

On a warm day, a swimmer climbs out of a swimming pool into the open air and water evaporates from his skin. As the water evaporates, which molecules escape into the air first and what happens to the average speed of the remaining water molecules?

A sample of a solid is heated for 12 minutes and its temperature noted every minute. The results are shown in the table. How should the sample be described at the end of the 12 minutes?

Food is kept in a loosely-packed cool-box which uses two ice packs to keep it cool. Where should the ice packs be placed to keep all the food as cool as possible?

A certain electrical appliance is powered from a mains supply. The appliance normally uses a current of 3.0 A, but the current briefly rises to 4.0 A at the instant the appliance is switched on. The cable to the appliance is designed for currents up to 6.0 A. A fuse is used to protect the circuit. What should be the rating of the fuse?

A lamp is connected in four circuits in turn. The batteries are identical and the resistors are identical. In which circuit is the lamp brightest?

The table compares an atom of carbon-13 and an atom of nitrogen-14. A neutral atom of carbon-13 and a neutral atom of nitrogen-14 have the same number of:

In which substance are the particles close together and slowly moving past each other?

A student was provided with only a thermometer, a stopwatch and a beaker. What could the student measure?

Mixture 1 contains sand and water. Mixture 2 contains salt and water. Which method of separation could be used to obtain each of the required products from each mixture?

The diagram shows the electronic structures of atoms P and Q. P and Q combine to form a molecule. What is the formula of this molecule?

Two isotopes of helium are Helium-3 and Helium-4. Which two diagrams show the arrangement of particles in these two isotopes?

The first table describes the structures of four particles. What are the correct values of X , Y and Z ?

The relative formula mass, Mr, of copper(II) sulfate, CuSO4, is 160. Which mass of sulfur is present in 160g of copper(II) sulfate?

The diagram shows a section of an overhead power cable. Which statement explains why a particular substance is used?

Metals could be extracted from their molten chlorides using electrolysis. Which substances are formed at each electrode?

Some reactions are listed below. methane + oxygen → carbon dioxide + water sodium + water → sodium hydroxide + hydrogen magnesium + hydrochloric acid → magnesium chloride + hydrogen Which word correctly describes all of these reactions?

An experiment to determine the rate of a chemical reaction could be carried out using the apparatus shown. Which reaction is being studied?

Which type of reaction always forms a salt and water?

Which property is not characteristic of a base?