Chemical reactions Flashcards
(26 cards)
What is a chemical reaction?
A process that involves the transformation of one or more substances into different substances.
True or False: In a chemical reaction, atoms are created or destroyed.
False: Atoms are neither created nor destroyed in a chemical reaction.
What is the law of conservation of mass?
The law states that mass is neither created nor destroyed in a chemical reaction.
Fill in the blank: In a chemical equation, the substances that are formed are called __________.
products
What are reactants?
Substances that undergo a chemical change in a reaction.
Which of the following is a sign of a chemical reaction? A) Color change B) Temperature change C) Gas production D) All of the above
D) All of the above
What is a balanced chemical equation?
An equation where the number of atoms of each element is the same on both sides.
True or False: A catalyst is used to speed up a chemical reaction without being consumed.
True
What is the purpose of a chemical equation?
To represent a chemical reaction using symbols and formulas.
Fill in the blank: The __________ is the starting material in a chemical reaction.
reactant
What type of reaction occurs when two or more substances combine to form a single product?
Synthesis reaction
What is the difference between an endothermic and exothermic reaction?
Endothermic reactions absorb heat, while exothermic reactions release heat.
Which of the following represents a decomposition reaction? A) A + B → AB B) AB → A + B C) A + B → C
B) AB → A + B
What is an example of a physical change?
Melting ice or boiling water.
True or False: All chemical reactions are reversible.
False: Some chemical reactions are irreversible.
Fill in the blank: The __________ of a reaction is the time it takes for reactants to be converted into products.
rate
What are oxidation and reduction reactions commonly known as?
Redox reactions
What is the role of an inhibitor in a chemical reaction?
To slow down or prevent a chemical reaction.
What is a combustion reaction?
A reaction that involves oxygen and produces heat and light, often resulting in flame.
Fill in the blank: In a __________ reaction, an acid reacts with a base to produce salt and water.
neutralization
What is the pH scale used for?
To measure the acidity or alkalinity of a solution.
True or False: A single replacement reaction involves one element being replaced by another in a compound.
True
What is a precipitate?
A solid that forms and settles out of a liquid mixture during a chemical reaction.
What does a coefficient in a chemical equation indicate?
The number of molecules or moles of a substance involved in the reaction.
