Abbyy01

State two sustainability issues resulting from the use of oil-based inks. [2 marks] Issue 1 ___________________________________________________________________________ ___________________________________________________________________________________ Issue 2 __

Give the name of the mechanism for reaction 1. State one essential condition needed for reaction 1. [2 marks] Name of mechanism Essential condition 0 1 . 2 Give equations to show three essential steps in the mechanism for reaction 1. [3 marks]

A halide ion X– reduces concentrated sulfuric acid to hydrogen sulfide. Identify the halide ion. Give an equation for the reaction. [2 marks] Halide ion Equation 0 2 . 8 Some solid sodium halides react with concentrated sulfuric acid without any redox reaction taking place. Identify a sodium halide that behaves in this way. Give an equation for the reaction. State the role of the halide ion in this reaction

S box ection A Answer all questions in this section. You are advised to spend no more than 1 hour and 15 minutes on this section. 0 1 . 1 Describe binary fission in bacteria.

In the following passage, the numbered spaces can be filled with biological terms. Glycolysis is the first stage of respiration. It occurs in the (1) of cells and is an anaerobic process. Glycolysis involves the (2) of glucose to glucose phosphate, using ATP. The oxidation of triose phosphate to (3) results in the net gain of ATP and reduced (4) . Write the correct biological term beside each number below that matches the space in the passage.

The digestion and absorption of lipids involves: • emulsification by bile salts • micelles. Explain each of the following. [4 marks] The importance of emulsification in the digestion of lipids

The continuous random variable X has standard deviation 16 Find Var(5X – 12) Circle your answer. [1 mark]

A motorcycle has a maximum speed of 44 m s–1 on a straight, horizontal road. The maximum power of the motorcycle is 55 kilowatts. Find the magnitude of the total resistance force acting on the motorcycle at its maximum speed on this road. Circle your answer. [1 mark] 1.25 N 125 N 1250 N 2420 N

The group A is of order 9 The group B is a proper, non-trivial subgroup of A Find the order of B Circle your answer. [1 mark] 1 3 9 18

The vectors a b       and     1 c are perpendicular. Which one of the following statements must be true? Tick () one box. [1 mark] a = bc b = ac a = –bc b = –ac

The equation + += 2 4 0 x xc has non-real roots. Find the range of possible values of c Circle your answer. [1 mark] c < 4 c ≤ 4 c ≥ 4 c > 4 2 The point A on the Argand diagram represents the complex number z The point B is the reflection in the imaginary axis of the point A

The continuous random variable A has probability density function f (a) and variance 16 It is given that f (a) = 0 for a < 0 and ∫∞ 0 a2f (a)da = 52 Find the mean of A Circle your answer. [1 mark] 4 6 36 68 2 The random variable X ~ Po(6.50) The random variable Y ~ Po(20.54) The random variables X and Y are independent. Find the standard deviation of X + Y Circle your answer. [1 mark] 3.75 5.20 14.04 27.04

A particle travels around a horizontal circle of radius r metres with a constant angular speed of ω radians per second. _ State an expression for the magnitude of the acceleration, in m s–2, of the particle. _ Circle your answer. [1 mark] r2ω ω r2 rω2 ω2 r

A student is solving a network flow problem involving water pipes. They have correctly found a flow through the network of 36 m3 s–1 They have correctly found a cut of the network with value 36 m3 s–1 Which one of the following is correct? Tick () one box. [1 mark] The maximum flow through the network is less than 36 m3 s–1 The maximum flow through the network is equal to 36 m3 s–1 The maximum flow through the network is greater than 36 m3 s–1 It is not possible to make a con...

Answer all questions in the spaces provided. 1 Calculate the product (3 + i)(2 – i) Circle your answer. [1 mark] 5 – i 5 + i 7 – i 7 + i 2 The complex number 3 + 5i is a root of the quadratic equat

A student states that the product of two irrational numbers is always irrational. One of the options is a counter example that shows the student’s statement is incorrect. Identify the counter example. Circle your answer. [1 mark] e × 0 = 0 1π × π = 1 1 √ 2 × √ 6 = √ 3 2 × √ 3 = √ 6

Describe the single transformation which maps the curve with the equation y = ln x onto the curve with the equation y = 2 ln x Tick () one box. [1 mark] Stretch, scale factor 2, parallel to the y‑axis Stretch, scale factor 12 , parallel to the x‑axis Translation 2 0 Translation 0 2

Answer all questions in the spaces provided. 1 The equation of a curve is given by y = 3ex Find an expression for dy dx Circle your answer. [1 mark] 3e–x 3e1 3ex 3xex–1 2 A sequence is defined by xn+1 = –14 xn with x1 = 32

Answer ALL questions. SECTION A Read Extracts A–D in the Source Booklet before answering Question 1. Write your answers in the spaces provided. 1 (a) Discuss whether the growth of a firm will always lead to diseconomies of scale

Answer ALL questions. SECTION A Read Extracts A–D in the Source Booklet before answering Question 1. Write your answers in the spaces provided. 1 It is estimated that the income elasticity of demand (YED) for frozen food is -2.37. (a) Using this data and data in Extract D, calculate to 2 decimal places, the likely change in demand for frozen food in December 2022. You are advised to show your working.