GCSE Chemistry 5

Question 1

Which type of radiation is the most penetrating and requires thick lead or concrete to stop it?

Accepted Answer

Gamma radiation

Answer

Gamma radiation consists of high-energy electromagnetic waves with no mass or charge, making it the most penetrating type.

Question 2

What is produced when an alkene undergoes an addition reaction with hydrogen (hydrogenation)?

Accepted Answer

An alkane

Answer

Hydrogenation of an alkene adds H2 across the double bond, converting it to a saturated alkane.

Question 3

Which of the following is a property of giant ionic lattices?

Accepted Answer

They conduct electricity when molten or dissolved in water

Answer

Ionic compounds only conduct electricity when molten or dissolved because the ions are then free to move and carry charge.

Question 4

The Haber process produces ammonia from nitrogen and hydrogen. What are typical conditions used?

Accepted Answer

450°C, 200 atmospheres, iron catalyst

Answer

The Haber process uses about 450°C, 200 atmospheres pressure, and an iron catalyst as a compromise between yield and reaction rate.

Question 5

Which functional group is present in carboxylic acids?

Accepted Answer

−COOH

Answer

Carboxylic acids contain the −COOH (carboxyl) group, which consists of a carbonyl and a hydroxyl group bonded to the same carbon.

GCSE - General Certificate of Secondary Education Practice Test