Section 5. Chemical energetics for Chemistry, IGCSE - revisedeck

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5. Chemical energetics

A section of Chemistry, 0620

Listing 10 of 192 questions

The initial and final temperatures of four different reactions are measured. Which reaction is the least exothermic?

0620_w23_qp_22

MCQ

2023

Paper 2, Variant 2

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Which equation represents an endothermic reaction?

0620_w23_qp_22

MCQ

2023

Paper 2, Variant 2

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Which reaction pathway diagram represents an endothermic reaction?

0620_w24_qp_11

MCQ

2024

Paper 1, Variant 1

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The temperature of the water in two beakers, X and Y, is measured as 21.5 C. 5 g of sodium chloride is dissolved in the water in beaker X. The temperature changes to 18.0 C. 5 g of calcium oxide is dissolved in the water in beaker Y. The temperature changes to 29.4 C. Which types of process are occurring in beakers X and Y?

0620_w24_qp_12

MCQ

2024

Paper 1, Variant 2

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Which row describes the reaction pathway diagram and energy change in an exothermic reaction?

0620_w24_qp_13

MCQ

2024

Paper 1, Variant 3

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The table shows the initial and final temperatures for four different reactions. reaction initial temperature / C final temperature / C Which reactions are endothermic?

0620_w24_qp_13

MCQ

2024

Paper 1, Variant 3

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Which row describes a reaction where the overall energy change is exothermic?

0620_w24_qp_23

MCQ

2024

Paper 2, Variant 3

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Limestone can be changed into slaked lime in two chemical reactions. When limestone, CaCO3, is heated it decomposes into lime, CaO. Water is slowly dripped onto the cooled lime. The lime appears to expand and steam is produced. Slaked lime, Ca(OH)2, is formed. Which row shows the correct description of each of the chemical reactions?

0620_m15_qp_12

MCQ

2015

Paper 1, Variant 2

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Which row describes an endothermic reaction?

0620_m16_qp_22

MCQ

2016

Paper 2, Variant 2

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The diagram shows a match. By striking the match, a chemical reaction takes place. Which row describes the chemical reaction?

0620_m18_qp_12

MCQ

2018

Paper 1, Variant 2

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Questions Discovered

192