Chemical Names and Formulas
What are the elemental symbols in the compound Nickel Oxide?
Ni and O
What are the chemicals on the left side of a chemical equation called?
Reactants
In exothermic reactions heat is ______.
released
What is on the y-axis of an energy diagram
Potential energy
It will increase the reaction rate.
What is the formula for Carbon tetrafluoride?
CF4
What type of reaction is this: 2 Al2O3 --> 4 Al + 3 O2
Decomposition Reaction
Is burning wood endothermic or exothermic? How do you know?
Exothermic; burning wood results in the release of heat and light in the form of fire.
What does the x-axis of an energy diagram represent?
The progress of a reaction
It reduces the activation energy.
How many carbon atoms are depicted here:
3 (CH3CH2CH2CH3)2
24 Carbon atoms
What 2 types of reactions will definitely produce water as one of the products?
Acid-Base Reactions and Combustion Reactions
Is boiling water endothermic or exothermic? How do you know?
Endothermic; the water absorbs heat in order to increase the energy of its particles to boil.
In an endothermic reaction, how does the potential energy of the products and reactants compare?
The products will have higher potential energy than the reactants
Would you expect a square block of 100 atoms to react quicker or slower than 5 blocks of 20 atoms? Why?
Slower because the singular block has less surface area than the 5 blocks. The chance of collisions between the reactants is higher when you have more surface area exposed.
What is the name of the following compound: C3F8?
Tricarbon octafluoride
Write a balanced chemical equation for elemental aluminum and hydrogen monochloride reacting to produce hydrogen gas and aluminum chloride.
(You should be able to figure out how many aluminum and chloride atoms are in aluminum chloride.)
2 Al + 6 HCl --> 3 H2 + 2 AlCl3
Is digestion endothermic or exothermic? Explain how you know.
Exothermic; the breakdown of food releases heat, making you feel warmer after you eat.
In an exothermic reaction, what is represented when you subtract the energy of the products from the energy of the reactants?
The amount of heat that was released from the reactants
Beaker A contains 500 grams of a reactant in 500 ml of water. Beaker B contains 20 grams of a reactant in 10 ml of water. Which beaker would you expect to have a quicker rate of reaction and why?
Beaker B because the concentration of reactants is higher.
What is the name of the following compound: Fe3As2
Iron arsenide
Balance this chemical equation and then write what type of reaction it is.
C8H18 + O2 --> CO2 + H2O
(We will not give you something this big on the quiz.)
2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O
Combustion reaction
Plants creating sugar inside of them is an exothermic or endothermic process?
Endothermic Process, it is storing sunlight into the bonds of glucose.
What is happening in the reaction during the upwards sloping part of the energy diagram?
The reactants are absorbing energy to break their bonds.
You want to see what will affect the rate at which wood burns.
For the first trial, you burn wood out in the open and find that it takes 5 hours to turn into charcoal and ash.
For the second trial, you burn wood in a highly oxygenated chamber and find that it takes 2 hours to turn into charcoal and ash.
What type of reaction was this? Why was there a difference in reaction rates?
Combustion reaction; the highly oxygenated chamber makes it so that the concentration of O2 is higher, meaning higher rate of collisions are possible to allow the reaction to happen.