20 Questions
Which of the following is essential for a chemical reaction to occur?
Presence of catalyst
What are chemical reactions?
Reactions that result in the formation of new substances
What is the role of enzymes in chemical reactions?
Enzymes speed up chemical reactions by lowering activation energy
In a chemical equation, what does the arrow symbol (->) represent?
Reversible reaction
What is the stoichiometry of a chemical reaction?
The study of the mass relationships in a chemical reaction
Which factor affects the rate of a chemical reaction?
Both concentration of reactants and presence of catalysts
What is true about exothermic reactions?
They release heat to the surroundings
Which statement is true about equilibrium in a chemical reaction?
The concentration of reactants and products remains constant over time
What happens to the mass in a closed system during a chemical reaction?
Mass remains constant before and after the reaction
What is true about a catalyst in a chemical reaction?
It speeds up the reaction without being consumed
What is the total number of 'Stoichiometry' sections found in the text?
20
How many times is '3.2. Stoichiometry' mentioned in the text?
10
What is the average number of 'Stoichiometry' sections in each group of 3 sections?
7
How many times does '3.3. Stoichiometry' appear after '3.1. Stoichiometry'?
5
If the first 'Stoichiometry' section is numbered 3.1, what is the last section's number?
3.25
Which type of chemical reaction involves the transfer of electrons from one substance to another?
Redox reaction
What is the coefficient of oxygen when balancing the following chemical equation: $C_6H_{12}O_6 + O_2 \rightarrow CO_2 + H_2O$?
5
In a stoichiometry problem, if the given quantity is in moles, what should it be converted to for further calculations?
Grams
What factor affects the rate of a chemical reaction by providing an alternate pathway with lower activation energy?
Catalyst
What type of chemical reaction involves a single compound breaking down into two or more simpler substances?
Decomposition reaction
Study Notes
Chemical reaction and equations
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