An AC voltage is induced in a coil of wire when it is rotated in a magnetic field. This voltage can be displayed on the screen of an instrument called…

Mohr’s Salt is a common laboratory reagent. Use the information of the most abundantisotopes below to calculate the formula mass, Mr , of the hydrated salt.Formula of Mohr’s Salt: (NH4)2Fe(SO4)2.6H2OMost…

The following statements are features of an enzyme from a healthy human.1 It works at an optimum pH below 4.2 It digests a substrate into amino acids.3 It works at…

The mean mass of a group of N people is 75 kg.Jim, Karen and Leroy join this group, without anyone leaving; the new mean mass is 78 kg.The mean mass…

Nickel has an atomic number of 28. The mass numbers of four of its isotopes are 58, 60, 61and 62.Below are three statements about these isotopes of nickel.1 All of…

Which one of the following mixtures could not be separated using the technique given? Answer: 5) B It is easy to identify W as a chromosome. This rules out options…

The diagram shows some of the stages of how a length of DNA can be removed from one organism and introduced into another organism. Which row is correct? Answer: 4)…

A straight line passes through the points P ( 3,− 3) and Q (6, 9). Which one of the following is an equation of a straight line which is parallel…

A student carries out an experiment to determine the density of the material from which two identical solid objects are made. She uses a balance and a measuring cylinder containing…

Element X has the electronic structure 2, 8, 3.Which of the following statements about this element are correct?1 The element is in Group 12, Period 3 of the Periodic Table.2…