The square ABCD is positioned so that its vertices are at the points with coordinates: (1, 1), (-1, 1), (-1, -1) and (1, -1). The square is rotated clockwise through…

The diagrams show two glass blocks in air. For the rays of light shown, the critical angle for the glass/air boundary is 42°. A ray of light is shown approaching…

1.15 g of sodium completely reacts with water at standard temperature and pressure (STP). What volume of hydrogen at STP is produced by this reaction? [Assume in this question that…

In a reflex action in which a person touches a hot plate and pulls their arm away, neurons of different lengths are involved. Which answer identifies the relative lengths of…

Simplify: Answer: 8) F Break the problem into smaller parts 1st step:  x² (1 – 16x²) = x² – 16x⁴ 2nd step:  2x³ (4x – 1) = 8x⁴ – 2x³…

7 The diagram shows three appropriate meters, P, Q and R, connected in the conventional way in a circuit. The switch is initially open. The switch is now closed. What…

The following reaction is at equilibrium: 2R(g) + 3S(g)  2T(g)      llH is negative which conditions (A-E) would produce most of the product T? Answer: 6) B In order to produce…

The action of which enzyme(s) could decrease the pH of a mixture of carbohydrate, protein and lipid? Answer: 5) F A logical way of solving this question is to identify…

Answer: 4) A Substitute the values given in the problem 4.6 x 10⁷ + 7 (2 x 10⁶)4.6 x 10⁷ – 2 (2 x 10⁶) (4.6 x 10⁷) + (14…

Microwave, X-ray and infra-red radiation can all damage living tissues. Which of the following statements correctly explain why this damage occurs? Microwaves cause damage because they are absorbed by water…