Chemical reactions and combustion Flashcards
(24 cards)
What is a chemical reaction?
A process in which one or more substances are converted into different substances.
True or False: During a chemical reaction, the mass of the reactants equals the mass of the products.
True
Fill in the blank: A __________ reaction is a type of chemical reaction where a substance combines with oxygen to release energy.
combustion
What are the main products of complete combustion of hydrocarbons?
Carbon dioxide and water.
What is the general equation for a combustion reaction?
Fuel + Oxygen → Carbon Dioxide + Water + Energy
Multiple Choice: Which of the following is NOT a sign of a chemical reaction? A) Color change B) Formation of a gas C) Change in state D) Temperature change
C) Change in state
What is an exothermic reaction?
A reaction that releases energy, usually in the form of heat.
True or False: Combustion reactions can only occur in the presence of a catalyst.
False
What is the difference between complete and incomplete combustion?
Complete combustion produces carbon dioxide and water, while incomplete combustion produces carbon monoxide and/or soot.
Fill in the blank: The __________ of a reaction is the starting substance that undergoes change.
reactant
Multiple Choice: Which of the following is a common reactant in combustion reactions? A) Nitrogen B) Oxygen C) Hydrogen D) Argon
B) Oxygen
What is the law of conservation of mass?
In a chemical reaction, mass is neither created nor destroyed.
True or False: All chemical reactions require heat to occur.
False
What is a catalyst?
A substance that increases the rate of a chemical reaction without being consumed.
Fill in the blank: In a combustion reaction, the fuel is typically a __________.
hydrocarbon
Multiple Choice: Which of the following is a product of incomplete combustion? A) Carbon Dioxide B) Water C) Carbon Monoxide D) Both A and C
D) Both A and C
What is the role of oxygen in combustion?
Oxygen acts as an oxidizer that reacts with the fuel to produce energy.
True or False: Combustion can occur without a heat source.
False
What does the term ‘stoichiometry’ refer to in chemical reactions?
The calculation of reactants and products in chemical reactions.
Fill in the blank: The __________ of a chemical reaction describes the energy changes that occur during the reaction.
enthalpy
Multiple Choice: What type of reaction involves the breaking and forming of chemical bonds? A) Physical Change B) Chemical Reaction C) Nuclear Reaction D) Thermal Reaction
B) Chemical Reaction
What is the significance of activation energy in a chemical reaction?
Activation energy is the minimum energy required to initiate a chemical reaction.
True or False: All combustion reactions are spontaneous.
False
What is the effect of temperature on the rate of chemical reactions?
Increasing temperature generally increases the rate of chemical reactions.
