prefinals Flashcards
What is the suggestion of Svante Arrhenius in 1888 about chemical reaction?
Particles must possess a certain minimum amount of kinetic energy in order to react
Which of the following statements best describes Collision Theory?
Atoms or molecules must collide with sufficient amount of energy in order to react.
How will you increase the rate of a chemical reaction?
add catalyst
The amount of energy required to break the bonds between the reacting molecules is known as?
activation energy
One of the factors that affect the rate of chemical reaction is concentration of solution. Describe this factor
It is the measure of the number of particles of solute in a given volume of solution.
What refers to the peak of the energy diagram for a chemical reaction?
Activated Complex
How will crushing a solid into a powder increase reaction rate?
The powdered form has more surface area
The rate of reaction increases as the temperature increases. Which of the following statements provides the best explanation for this?
At higher temperature, the particles have more energy, move faster and collide more often.
When a lit match touches the wick of a candle, it begins to burn. When the match is removed, the candle continues to bum. The match_
supplies the activation energy
Manganese (IV) dioxide acts as a catalyst in the decomposition of hydrogen peroxide. How does a catalyst increase the rate of reaction?
increasing the activation energy of the overall reaction
Particle size is a factor which affects reaction rates. Which statement (s) is/are met true about particle size?
- As the temperature rises, the molecules move faster and therefore collide more and have greater chances to react with each other.
II. The smaller pieces have a greater surface area, thus, providing much greater contact among the reactants and effecting more collisions. When solid reactants are present in small pieces, reaction rates increase.
III. As the temperature rises, the molecules move faster and therefore collide more and have greater chances to react with each other
You sent
II only
Perishable goods that are not properly stored show signs of spoilage in less than a day. Which of the following is not a possible cause of this spoilage
amount of goods
Filipino farmers use different natural ripening agents such as the use of kalburo, leaves of kakawate and acacia leaves. This practice intends to address the need for the availability of fruits all the time. What factor affecting the rate of reactions influences this situation?
catalyst
The following statements describe concentration of solution as a factor that affects the rate of reaction. Which among the given statement is NOT correct?
When solid reactants are present in small pieces, reaction rates can decrease
To remove clothes stains faster, one either uses higher amounts of calamansi extract or laundry bleach. What factor influences this situation?
concentration of the reactants
