We use expanded polystyrene cups for heat of reaction experiments because the cups are:

0.045 × 10^-3 in scientific notation is

What is the value of u in the sequence 2 , 7 , 14 , 23 , 34 , u ?

Measuring plant growth by measuring height is convenient, but inaccurate because:

The active catalyst in a car′s catalytic converter is:

Which of the following sets has a finite number of members?

The correct pathway of water through a plant is:

Which one of the following factors does NOT affect the rate of transpiration?

The aim of the experiment shown above was to find out if:

The Earth′s first atmosphere contained all of these gases EXCEPT for:

Which of the following characteristics MUST ALL formal groups possess?

1. Membership requirements
2. Code of conduct
3. Specific objectives
4. Elected leaders

Which of the following would play an important part in a government′s efforts to increase consumption of locally produced food?

In the diagram, B is due north of A; C is east of B, and AB = BC.

To remove limescale from a tap you need:

Transpiration is:

A __________ is a device that is externally connected to and under the control of the central processing unit.

Arrange the following secondary storage devices in order of increasing capacity from smallest to largest: a 1GB memory card, CD-ROM, DVD and a 128 MB flash drive.

The non-metal used to make margarine is:

If a flask containing marble and acid is placed on a balance, the mass decreases steadily with time, which means that:

A species of mouse has 32 chromosomes in its muscle cells.What will be the numbers of chromosomes in the mouse′s skin cells and sperm cells?