Ecuaciones químicas Flashcards
What is a chemical equation?
A representation of a chemical reaction using symbols and formulas.
True or False: In a balanced chemical equation, the number of atoms of each element is the same on both sides.
True
What does the arrow in a chemical equation signify?
It indicates the direction of the reaction, from reactants to products.
Fill in the blank: The substances that undergo a chemical change are called __________.
reactants
What is the purpose of balancing a chemical equation?
To ensure the law of conservation of mass is obeyed.
Which of the following is NOT a type of chemical reaction? A) Synthesis B) Decomposition C) Multiplication D) Combustion
C) Multiplication
Define a synthesis reaction.
A reaction where two or more reactants combine to form a single product.
True or False: A decomposition reaction involves a single compound breaking down into two or more simpler substances.
True
What is a combustion reaction?
A reaction that occurs when a substance reacts with oxygen, producing energy in the form of heat and light.
Fill in the blank: In a double displacement reaction, two compounds exchange __________.
ions
What is the general form of a combustion reaction?
Hydrocarbon + O2 → CO2 + H2O
What do coefficients in a chemical equation represent?
The number of moles of each substance involved in the reaction.
True or False: The states of matter for each reactant and product are usually indicated in a chemical equation.
True
What is the significance of the ‘Δ’ symbol in a chemical equation?
It indicates that heat is applied to the reaction.
What type of reaction is represented by the equation: AB → A + B?
Decomposition reaction
What does it mean to balance a chemical equation?
To adjust the coefficients so that the number of atoms of each element is equal on both sides.
Fill in the blank: The product of a synthesis reaction is generally a __________.
compound
What is an example of a physical change?
Melting ice.
What is the difference between an exothermic and endothermic reaction?
Exothermic releases heat, while endothermic absorbs heat.
True or False: Catalysts are substances that speed up a chemical reaction without being consumed.
True
What does the symbol ‘→’ represent in a chemical equation?
It separates reactants from products.
What is the first step in balancing a chemical equation?
Write the unbalanced equation.
Fill in the blank: The Law of Conservation of Mass states that mass is neither created nor __________ in a chemical reaction.
destroyed
What is the role of a catalyst in a chemical reaction?
To increase the reaction rate without being consumed.
