... neutrons and electrons are in each of the following atoms? a) Number of protons = number of electrons = atomic number = 11 Number of neutrons = mass ... 80 – 35 = 45 b) Answer: 35 protons, 35 electrons, 45 neutrons c) Number of ... atom, and ...
... burner flame. A flame test can be used to identify them. Method • Make a loop on the end of a. It is possible to identify the ions present in a salt by carrying out cation tests and anion tests. Figure 6.22 Procedure for a flame test.
... reacts with structure A to form the same ester. [1] 8–4 Structure A has a melting ... Benzene reacts with nitric acid in the presence of a catalyst to form ... reactions can be used to produce 5-amino-2-methylbenzenesulfonic acid from ...
... amine. Naming amines can be confusing as there are many variations on the names. The following examples will illustrate how to name different amines. TIP. The easiest way to recognise a primary, secondary or tertiary amine is to count ...
AQA GCSE (9-1) Combined Science Trilogy Student Book 2
... term that means the same as 'selective breeding'? 15 Describe the dangers of inbreeding. 16 Define the term 'transgenic organism'. 17 Explain how scientists genetically engineered a glow-in-the-dark rabbit. 18 Explain how and why golden ...
... enthalpy change is endothermic so a '+' is placed in front of the value to indicate an endothermic enthalpy change. Calculating enthalpy of neutralisation The enthalpy change that occurs during a neutralisation reaction when.
... mechanism for mononitration is shown in Figure 47. Exam. tip. In the ... nitration in the laboratory, methyl benzoate, a compound of low toxicity is ... methyl 3nitrobenzoate is formed, which is filtered off using suction filtration, washed ...
... calculate a value for the enthalpy change to 3 significant figures in kJ mol1 . ( The specific heat capacity of water is 4.18 J K ̄1 g - 1 . ) Answer AT 13.7 ° C = q = mc AT = 25.0 x 4.18 x 13.7 1431.65 J number of moles ( n ) = 0.0770 ...
... enthalpy of reaction for the hydrogenation of ethene is: The units of standard enthalpy changes of reaction may be given as kJ or kJ mol−1. kJ mol−1 are ... enthalpy change of reaction Symbol: Calculating enthalpy change of combustion.
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