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Energy Change and Reaction Rate
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What is a catalyst?
A catalyst is a substance that speeds up a chemical reaction by providing an alternative pathway with lower activation energy
The Collision Theory states that...
The reactant particles must collide and the collisions must have enough energy and correct orientation to be successful
How does temperature relate to the rate of reaction? Explain using the collision theory
as the temperature increases, the particles will gain more kinetic energy, the collision frequency also increases, and so the reaction rate increases
How does reactant concentration relate to the rate of reaction? Explain using the collision theory
as the concentration increases, the number of particles per volume increases, increasing the collision frequency, the rate also increases
In the reaction between magnesium and hydrochloric acid, why do we need to clean the magnesium ribbon with sand paper?
to remove the layer of magnesium oxide on the magnesium ribbon
Looking at the rate graph: How can you tell from it when the reaction was over?
The curve goes flat
Looking at the rate graph: The faster the reaction, ______________
The steeper the slope
What apparatus do we use to measure the gas volume?
Gas syringe
Define Reaction Rate
A measure of change in the amount of reactants consumed (or products produced) per unit time
ENDOTHERMIC OR EXOTHERMIC: Cooking steak.
Endothermic
ENDOTHERMIC OR EXOTHERMIC: Neutralization reaction (acid + base)
Exothermic
ENDOTHERMIC OR EXOTHERMIC: Ice cubes in your glass of soda melt.
Endothermic
ENDOTHERMIC OR EXOTHERMIC: You freeze juice to make ice pops.
Exothermic
What type of reaction is portrayed in this energy diagram? Where there is MORE energy in the reactants, and LESS energy in the products.
Exothermic Reaction
What type of reaction is portrayed in this energy diagram? Where there is MORE energy in the products, and LESS energy in the reactants.
Endothermic Reaction
Is photosynthesis an Exothermic or an Endothermic reaction?
Endothermic (light energy is absorbed)
An endothermic reaction is occurring in a beaker. We are part of the surroundings and touched the beaker, so it would feel _______.
Cooler
Do the REACTANTS in an Exothermic Reaction have a higher or lower energy than the products?
Higher
Do REACTANTS in an Endothermic Reaction have a higher or lower energy than the products?
lower
If a chemical reaction is EXOTHERMIC, the temperature would....
increase
In an endothermic reaction, energy is ...
Absorbed / Taken in (by the system from the surroundings)
In an exothermic reaction, energy is ...
Released / Given out (by the system to the surroundings)
A change in temperature, formation of bubbles, precipitate forms, color change, change in smell, difficult to reverse are all signs of ?
Chemical Reaction
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