Chemistry Flashcards
7 cards from real GCSE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Chemistry flashcards as text
Which type of radiation is the most penetrating and requires thick lead or concrete to stop it?
Answer: Gamma radiation
Gamma radiation consists of high-energy electromagnetic waves with no mass or charge, making it the most penetrating type.
What is produced when an alkene undergoes an addition reaction with hydrogen (hydrogenation)?
Answer: An alkane
Hydrogenation of an alkene adds H2 across the double bond, converting it to a saturated alkane.
Which of the following is a property of giant ionic lattices?
Answer: They conduct electricity when molten or dissolved in water
Ionic compounds only conduct electricity when molten or dissolved because the ions are then free to move and carry charge.
The Haber process produces ammonia from nitrogen and hydrogen. What are typical conditions used?
Answer: 450°C, 200 atmospheres, iron catalyst
The Haber process uses about 450°C, 200 atmospheres pressure, and an iron catalyst as a compromise between yield and reaction rate.
Which functional group is present in carboxylic acids?
Answer: −COOH
Carboxylic acids contain the −COOH (carboxyl) group, which consists of a carbonyl and a hydroxyl group bonded to the same carbon.
A student tests an unknown solution with universal indicator and it turns yellow. What does this indicate?
Answer: The solution is weakly acidic (pH 5–6)
Yellow on a universal indicator corresponds to a weakly acidic solution with a pH of approximately 5–6.
During the fractional distillation of crude oil, which fraction is collected at the lowest temperature?
Answer: Refinery gases
Refinery gases (such as methane, ethane, propane) have the shortest carbon chains, lowest boiling points, and are collected at the top of the fractionating column at the lowest temperature.