Chap 1 Flashcards
(26 cards)
What is a chemical equation?
A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products.
True or False: In a chemical equation, the mass of reactants equals the mass of products.
True
Fill in the blank: The substances that undergo a chemical change are called __________.
reactants
What are products in a chemical reaction?
Products are the substances formed as a result of a chemical reaction.
What is the law of conservation of mass?
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Write the general form of a chemical reaction.
Reactants → Products
What does a balanced chemical equation show?
A balanced chemical equation shows that the number of atoms of each element is the same on both sides of the equation.
True or False: Coefficients in a chemical equation represent the number of molecules or moles.
True
What is the purpose of balancing a chemical equation?
The purpose of balancing a chemical equation is to comply with the law of conservation of mass.
Identify the reactants in the equation: 2H₂ + O₂ → 2H₂O.
H₂ and O₂ are the reactants.
Fill in the blank: A __________ reaction is a reaction in which two or more substances combine to form a single product.
combination
What type of reaction is represented by the equation: AB → A + B?
Decomposition reaction
In a combustion reaction, what is typically produced?
Carbon dioxide and water are typically produced.
True or False: All chemical reactions can be classified as either exothermic or endothermic.
True
What is an exothermic reaction?
An exothermic reaction is a reaction that releases energy in the form of heat.
What is an endothermic reaction?
An endothermic reaction is a reaction that absorbs energy from its surroundings.
Fill in the blank: The symbol ‘→’ in a chemical equation indicates __________.
the direction of the reaction
What is the role of a catalyst in a chemical reaction?
A catalyst speeds up a chemical reaction without being consumed in the process.
Identify the products in the equation: 2Na + Cl₂ → 2NaCl.
NaCl is the product.
True or False: All chemical equations must be balanced to be accurate.
True
What does the term ‘stoichiometry’ refer to in chemistry?
Stoichiometry refers to the calculation of reactants and products in chemical reactions.
Fill in the blank: A __________ reaction involves the exchange of ions between two compounds.
double displacement
What is a redox reaction?
A redox reaction is a type of reaction involving the transfer of electrons between two species.
What is the significance of the coefficients in a balanced equation?
Coefficients indicate the relative amounts of each substance involved in the reaction.
