Plugs of cotton wool containing concentrated aqueous ammonia and concentrated hydrochloric acid are placed at opposite ends of a tube, at room temperature. A white ring of solid ammonium chloride…
Solve the inequalityx^2 ≥ 8 – 2x Answer: 13) D We need to use the inequalities given in the options to solve this question. x² ≥ 8 – 2x Rearranging,x²…
The diagram shows a family tree. The grandfather, individual 1, carries a recessive allele on his X chromosome. Which other individuals could have inherited this allele? Answer: 12) D Individual…
One of the steps in the breakdown of glucose is the conversion of pyruvic acid, CH3COCO2H, into lactic acid, CH3CH(OH)CO2H. This is an example of. Answer: 11) B Counting the…
The diagram shows two sets of parallel lines. Angles θ, α, β and γ are as marked. Which of the following statements are true? (shade all that apply). Answer: 10)…
A ball is thrown vertically upwards and leaves the thrower’s hand with a speed of 12m/s.Calculate the height to which it rises. You may assume that all of the initial…
An oxide of tungsten contains 79.31% by mass of tungsten.What is the formula of this oxide? (relative atomic masses: O = 16; W = 184) Answer: 8) E Round up…
The table shows some properties of five substances A - E. From the substances in the table, select the substances that could be: Answer: 7) E, B, A and C…
The diagram shows a section through the thorax. When breathing out (expiring), what happens to the muscles at X and Y and the pressure at Z? Answer: 6) E The…
During the electrolysis of hydrochloric acid, positively charged hydrogen ions move towardsthe cathode at a rate of 1018 ions per second. Negatively charged chloride ions movetowards the anode at the…