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Questions and Answers
Which statement is the most accurate description of the role of a catalyst in a chemical reaction?
Which statement is the most accurate description of the role of a catalyst in a chemical reaction?
In a neutralization reaction between hydrochloric acid and sodium hydroxide, what are the products formed?
In a neutralization reaction between hydrochloric acid and sodium hydroxide, what are the products formed?
How many molecules are present in a 2-mole sample of hydrogen gas (H2)?
How many molecules are present in a 2-mole sample of hydrogen gas (H2)?
Which of the following best describes an exothermic chemical reaction?
Which of the following best describes an exothermic chemical reaction?
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Which of the following best describes a displacement reaction?
Which of the following best describes a displacement reaction?
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Study Notes
Chemical Reactions
- Catalyst: A substance that speeds up a reaction without being chemically changed. It lowers the activation energy.
- Enzyme: A biological catalyst, an example is Amylase.
- Relative Formula Mass: The sum of the atomic masses of all elements in a compound, expressed in grams.
- Mole: One mole of any substance contains the same number of molecules/atoms as 12 grams of carbon-12 (Avogadro's constant, 6.02 x 1023).
- Exothermic Reaction: A reaction that releases heat (ΔH is negative).
- Endothermic Reaction: A reaction that absorbs heat (ΔH is positive).
- pH: A scale (0-14) that indicates whether a solution is acidic, neutral, or alkaline.
- Base: A substance with a pH higher than 7. Bases react with acids to form salts and water. Examples include metal hydroxides, oxides, and carbonates.
- Acid: A substance with a pH less than 7. Acids react with bases to form salts and water. Acidity is caused by a high concentration of hydrogen ions.
- Alkali: A soluble base (a base that dissolves in water). Alkalis have a pH greater than 7 and react with acids to form salts and water. They have a high concentration of hydroxyl ions (OH-).
- Neutralization: A reaction where an acid and a base react to form a salt and water. H+ + OH- → H2O
- Combustion: A reaction where a substance burns in oxygen, forming an oxide and releasing energy.
- Displacement: A reaction where a more reactive element takes the place of a less reactive element in a compound.
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Description
Test your knowledge of chemical reactions with this quiz. Explore important concepts like catalysts, enzymes, and the pH scale. Understand the differences between exothermic and endothermic reactions while learning about acids and bases.
