Flashcards on Chemical reactions: law of conservation of mass and balancing equations
Chemical Reactions: Law of Conservation of Mass and Balancing Equations
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Chemical Reactions
14 cards
Card 1
Question: What defines a chemical reaction?
Answer: A chemical reaction is a process that involves the rearrangement of the atomic, ionic, or molecular structure of a substance, as opposed to a change i
Card 2
Question: What are the starting substances in a chemical reaction called?
Answer: Reactants
Card 3
Question: What are the new substances formed in a chemical reaction called?
Answer: Products
Card 4
Question: What drives the transformation of substances in a chemical reaction?
Answer: Changes in the chemical bonds between atoms.
Card 5
Question: What must happen to existing bonds in reactant molecules for a chemical reaction to occur?
Answer: They must first break.
Card 6
Question: What typically happens to energy when chemical bonds break?
Answer: It requires an input of energy.
Card 7
Question: What happens after existing bonds break in a chemical reaction?
Answer: The atoms are free to rearrange themselves, and new bonds form.
Card 8
Question: What typically happens to energy when new chemical bonds form?
Answer: It usually releases energy.
Card 9
Question: What determines the overall energy change of a reaction?
Answer: The balance between the energy required to break bonds and the energy released when new bonds form.
Card 10
Question: In the combustion of methane (CH₄), what bonds break and what new bonds form?
Answer: The C-H and O=O bonds break, and new C=O and O-H bonds form.