# Buy Energy Changes Discusson Assignment Help

Buy Energy Changes Discussion Assignment Help
Buy Energy Changes Discussion Assignment Help
Neutralization reactions take place between acids and alkalis.
A student investigated the temperature change during the
reaction between sodium hydroxide and hydrochloric acid. They
measured 20.0cm3 of sodium hydroxide solution and placed it in a
polystyrene cup. They recorded the temperature of the solution and
then added hydrochloric acid to it. The student’s results are shown in Table 2.
Volume of acid
added in cm3 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0
Temperature
in °C 19.2 21.4 23.9 26.0 27.8 28.3 26.8 24.8 22.9
Table 2
1–1 Give the word equation for the reaction between sodium
hydroxide and hydrochloric acid. [1]
1–2 Use Table 2 to determine whether the reaction between sodium
hydroxide and hydrochloric acid is exothermic or endothermic.
1–3 Use Table 2 to suggest what volume of hydrochloric acid was
1–4 Another student wanted to investigate how the concentration of
the hydrochloric acid solution affected the temperature change
during the reaction between sodium hydroxide and hydrochloric acid.
Describe a method that the student could use to carry out their
investigation. Your method should give valid results. [6]
Total: 12
p235–7 5.5.1.3 MS1a
p213–4 5.4.2.2
p231–2 5.5.1.1
p234 5.5.1.1 RP4
AT1,3,
5,6
p234 5.5.1.1 RP4
AT1,3,
5,6
12 Energy changes
96
2 One method of producing water is to react hydrogen gas with
oxygen gas. Figure 2 shows the displayed formulae for this
reaction. Table 3 shows the bond energies involved in the reaction.
2 H H O O 2 H
O
H
Figure 2
H–H O=O H–O
Energy in kJ/mol 436 496 463
Table 3
2–1 Calculate the overall energy change for this reaction. Use Figure 2
and Table 3. [4]
2–2 Draw a fully labelled reaction profile for the reaction between
hydrogen and oxygen to form water. [3]
Total: 7
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