Chemical Reactions Flashcards
What is a chemical reaction?
The processes by which chemicals interact to form new chemicals with different compositions.
What is evidence of chemical reactions?
Change in color, energy change (temperature change or light produced), gas production, formation of precipitate and change in properties.
What are reactants?
The substances which participate in a chemical reaction, are called reactants.
What are products in a chemical equation?
The substances produced at the end of the reaction are known as the products.
What is a exothermic reaction?
A chemical reaction that releases energy by light or heat.
What is a endothermic reaction?
Chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
What are reactions that involve oxygen?
Oxidation is a process in which a substance is reacted with oxygen to produce one or more oxides; it is also defined as a loss of hydrogen atoms.
What are reactions that involve combustion?
When a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat.
What are reactions that involve corrosion?
Oxidation reaction of the metal (anodic reaction) and the reduction reaction of a reaction partner in the surroundings (cathodic reaction).
What are reactions that involve cellular respiration?
The chemical reaction for cellular respiration involves glucose and oxygen as inputs, and produces carbon dioxide, water, and energy as outputs.
What is the Law of Conservation of Mass?
The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. For example, the carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom changes from a solid structure to a gas but its mass does not change.
How do open and closed systems affect the mass of products?
Open systems allow both matter and energy to be exchanged with the environment, while closed systems only permit energy exchanges, keeping the mass constant within the system.
What are catalysts?
A substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one, without itself being consumed during the reaction.
What is concentration?
The amount of a substance in a defined space
What is surface area?
The area of the chemical components utilised in a chemical reaction is known as surface area.
