To complete the reaction: acid + carbonate → salt + carbon dioxide + ?, we must add the word:

When we are too hot, more blood flows through the capillaries near the surface of the skin. This helps us to cool down because the blood loses heat by:

To make car bodies we use:

You never find native magnesium because:

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

The system used by mission control in Houston, Texas to monitor the operation of space exploration vehicles is an example of the __________ processing mode.

For Mg++ to turn into an atom of magnesium metal it must:

Which of the following is a prime number?

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

When parents display a ............ for one child, the others are likely to feel ............

A girl whose weight is 250 N walks up a slope 40 m long onto a platform 3 m high. Her gain in gravitational potential energy is:

All of these materials are used in a blast furnace EXCEPT for:

The workplace should be:

When gas particles spread out we call it:

Sea breezes result because:

A trader received an invoice for $4,000 less 25% trade discount. Subsequently he returned one eighth of the goods. What amount would be entered in his Returns Outwards Account?

After a 10% discount, an article is sold for $360. The price before the discount was

Items bought by a trader for $80 are sold for $100. The profit expressed as a percentage of cost price is

Which one of the following foods contains the most energy per 100 g?

Which of the following BEST characterizes a primary group?

Plants make growth movements in response to all of the following stimuli EXCEPT for: