Powders react faster than lumps because they have:

At 20 ℃ all of the halogens are:

More collisions between particles are likely to happen if a solution is made:

When focussing on distant objects:

In pea plant size, tall is dominant to dwarf.You cannot tell whether a tall plant is homozygous (TT) or heterozygous (Tt).To find its genotype you perform a test cross.This involves:

If a reaction takes 50 seconds at 25 ℃, then at 50 ℃ the time for the reaction in seconds is likely to be about:

The rate of reaction between marble and hydrochloric acid can be speeded up by using:

The marked price of a stove was $520. A worker bought the stove on hire-purchase by making a down payment of $100, and twelve monthly payments of $40 each.
How much could she have saved if she had bought the stove for the marked price?

The following diagram shows a model used to show how breathing movements take place:

Which part of the model represents the diaphragm?

Which of the following statements about photosynthesis is NOT true?

The range of values of v when 5 - v ≤ 2v - 1 is

g/dm³ are units of:

All gas exchange surfaces in vertebrate animals have:

Which of the following entries should be used to post Sales return?

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

The units we use for heat given out by a reaction are:

Instruction: Choose from the four options the word or pair of words which BEST completes the meaning of the sentence.

An attack on someone when that person is most vulnerable may be ............ but is always ............

Excretion is best defined as:

Instructions: Select the option A, B, C or D that BEST describe the sentence.

Seldom do people declare that they are not the products of their environment.

In a box, there are 3 white, 4 red and 2 blue marbles. What is the probability that a marble taken at random is NOT blue?