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Open Ended

How do Venn diagrams help in classifying chemical reactions, and what advantages do they offer in understanding similarities and differences between reaction types?

Multiple Choice

Which of the following statements about combination and decomposition reactions is correct based on the information provided in both variants of the test?

• Combination reactions always produce a single compound, while decomposition reactions always produce simple substances.

• Combination reactions and decomposition reactions both involve only simple substances as products.

• Combination reactions always decrease the mass of the reactants, while decomposition reactions increase it.

• Combination reactions and decomposition reactions never involve gases as reactants.