My wallet contains two 50p coins and five 20p coins only. I need 70p to buy an item. If I pick two coins at random from my wallet, what is…

A wave travelling through a material has a frequency of 50 Hz and a wavelength of 0.40 m. How long does it take the wave to travel 100 m through…

The diagram below shows the apparatus that can be used in fractional distillation. Which of the following statements is/are correct about the process shown in the diagram?1 Covalent bonds between…

The diagram shows part of the nitrogen cycle. Which of the numbered arrows represent(s) denitrification? Answer: 5) A In Denitrification, nitrate ions are reduced to produce nitrogen gas (N2). This…

Which one of the following is a simplification of 48 m5 p / 40m2 p3 ? Answer: 4) B 48/40 = 6/5 m5 ÷ m2 = m3p ÷ p3 = p-2 The simplification…

Here are four statements about light:1 In a vacuum, green light travels faster than blue light.2 In a vacuum, the wavelength of red light is greater than the wavelength of…

Elements Q and Z are shown in the Periodic Table as: What is the empirical formula and bonding type of the compound formed between these elements? Answer: 2) C Q…

People with cystic fibrosis may be unable to digest their food fully because of thick sticky mucus. This prevents the secretion of pancreatic juices. Doctors sometimes prescribe enzyme supplement medication…

A graph of kinetic energy, in joules ( y - axis) against the square of the speed in (m / s) 2 (x - axis) is plotted for an object…

What is the volume of hydrogen gas formed (measured at room temperature and pressure)when 0.23 g of pure sodium reacts completely with an excess of water?(Ar values: H = 1.0;…