Chemistry Flashcards
What is the main focus of Chapter 1?
The main focus of Chapter 1 is the introduction to chemical reactions and their types.
True or False: A chemical reaction involves the rearrangement of atoms.
True
Fill in the blank: The law of conservation of mass states that mass is __________ in a chemical reaction.
neither created nor destroyed
What are the two main types of chemical reactions discussed in Chapter 1?
Synthesis and decomposition reactions.
Multiple choice: Which of the following is an example of a decomposition reaction? A) A + B → AB B) AB → A + B C) A + B → C
B) AB → A + B
What is a reactant?
A reactant is a substance that undergoes a chemical change in a reaction.
Name one factor that can affect the rate of a chemical reaction.
Temperature, concentration, surface area, or catalysts.
True or False: Exothermic reactions absorb heat from their surroundings.
False
What is the definition of an endothermic reaction?
An endothermic reaction is a reaction that absorbs heat from the surroundings.
What is Chapter 2 primarily about?
Chapter 2 is primarily about the different types of reactions and their characteristics.
Multiple choice: Which type of reaction is characterized by the exchange of ions between two compounds? A) Synthesis B) Decomposition C) Double displacement
C) Double displacement
Fill in the blank: In a __________ reaction, two or more substances combine to form a single product.
synthesis
What is the general form of a combustion reaction?
Hydrocarbon + O2 → CO2 + H2O
True or False: Catalysts are substances that speed up a chemical reaction without being consumed.
True
What does Chapter 3 cover regarding chemical equations?
Chapter 3 covers how to write and balance chemical equations.
What is a balanced chemical equation?
A balanced chemical equation has the same number of each type of atom on both sides of the equation.
Multiple choice: What is the purpose of balancing a chemical equation? A) To increase the speed of reaction B) To ensure mass conservation C) To change the reactants
B) To ensure mass conservation
Fill in the blank: In a balanced equation, the coefficients represent the __________ of the reactants and products.
moles
How do you start balancing a chemical equation?
Start by counting the number of atoms of each element on both sides.
True or False: It is acceptable to change the subscripts in a chemical formula to balance an equation.
False
What is the first step in balancing the equation C3H8 + O2 → CO2 + H2O?
Balance the carbon atoms first.
What does the symbol ‘→’ represent in a chemical equation?
The symbol ‘→’ represents the direction of the reaction, indicating the products formed from the reactants.
What is meant by the term ‘stoichiometry’?
Stoichiometry refers to the calculation of reactants and products in chemical reactions.
Fill in the blank: The __________ of a reaction is the maximum amount of product that can be formed.
theoretical yield
True or False: The actual yield is always equal to the theoretical yield.
False
