The burning of hydrogen is an exothermic reaction. Which statement explains this?

5070_w09_qp_1

MCQ

2009

Paper 1, Variant 0

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A researcher notices that atoms of an element are releasing energy. Why are the atoms releasing energy?

5070_w11_qp_11

MCQ

2011

Paper 1, Variant 1

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A researcher notices that atoms of an element are releasing energy. Why are the atoms releasing energy?

5070_w11_qp_12

MCQ

2011

Paper 1, Variant 2

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Which of these processes are both endothermic?

5070_w14_qp_12

MCQ

2014

Paper 1, Variant 2

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Bond breaking is an endothermic process and bond making is an exothermic process. For which change is it not possible, from the equation, to deduce whether the reaction is endothermic or exothermic?

5070_w14_qp_12

MCQ

2014

Paper 1, Variant 2

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Which change is endothermic?

5070_w15_qp_11

MCQ

2015

Paper 1, Variant 1

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When water is liquid, it ionises slightly. H2OH++ OH–The forward reaction is endothermic. When the temperature of water is increased, which changetake place?

5070_w16_qp_12

MCQ

2016

Paper 1, Variant 2

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Which statements about endothermic reactions are correct?

5070_w18_qp_11

MCQ

2018

Paper 1, Variant 1

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Which statements about endothermic reactions are correct?

5070_w18_qp_12

MCQ

2018

Paper 1, Variant 2

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Which statement about exothermic and endothermic reactions is correct?

5070_w19_qp_11

MCQ

2019

Paper 1, Variant 1

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