The masses of atoms and molecules can be determined using a mass spectrometer. The masses can be shown as a series of peaks. Element X exists as a diatomic molecule.…

The diagram shows three different types of animal cell. 1 epithelial cell2 mature red blood cell3 muscle cellWhich of these cells is/are found as part of a tissue? Answer: 13)…

All four corners of a rectangle are on the circumference of a circle.The rectangle has a perimeter of 24 cm.The ratio of length : width for the rectangle is 3…

Quantities associated with a moving vehicle include its velocity, speed, momentum and kinetic energy. Which of these quantities will always change if the vehicle changes direction? Answer: 11) E Speed…

Iron is extracted from iron ore (which contains Fe2O3) using carbon monoxide. This overall reaction is slow and so must be heated. The chemical equation for this reaction under certain…

A sample of healthy human cells contains 4 cells. After they were allowed to divide 5 times using the same type of cell division, there were 128 cells in the…

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…