Unit 5
What are 3 things needed to have a successful reaction according to collision theory?
Particles need to...
* Collide with one another
* Have enough energy
* Be oriented correctly
253.8 g/mol
A spoon at room temperature (25°C) is placed in a bowl of hot soup (90°C). Does the spoon get hotter or colder when it is added to the bowl of soup? Does this mean heat energy is entering or leaving the spoon?
The spoon gets hotter. Heat is entering the spoon
How many moles of KNO3 must be dissolved in water to make 1.5 L of a 2.0 M solution?
What is 3.0 mol KNO3?
What is the molar ratio of oxygen gas to water?
2 C3H7OH + 9 O2 → 6 CO2 + 8 H2O
9 mol O2 : 8 H2O
What is the molar mass of H2O?
18 g/mol
Calculate the amount of heat released when 7.40 g of water (C = 4.184 J/g°C) cools from 49°C to 28°C.
q = -650.19 J
How many moles of helium gas would be in a balloon with a volume of 2.0 L and pressure of 0.9 atm at 25°C?
0.0735 moles of helium gas
If reaction A took place in a 2L container and reaction B took place in a 1.5L container, which reaction would happen faster?
Reaction B because it has more concentration
How many molecules of CO2 are in 0.20 moles of CO2
1.2 x 1023 molecules of CO2
If a heated metal is placed into a cup of cold water. Will the water absorb less, the same, or more heat than the metal releases?
According to the law of thermodynamics, it will absorb the same amount as is released.
Based on the following reaction will the solution be acidic or a base?
Ca(OH)2 -> Ca2+ + 2OH-
Is will be a Base because it produced OH-
Balance the following reaction
___H2O → ___H2 + ___O2
2 H2O → 2 H2 + O2
How many moles of N2 are in 3g of N2?
0.107 moles of N2
Calculate the amount of heat absorbed when 9.88 g of silver (C = 0.235 J/g°C) goes from 23°C to 25°C.
q = 4.64 J
Which of these will be the strongest acid?
Lemon Juice has a pH of 2.0
Soda has a pH of 3.0
Coffee has a pH of 5.0
Lemon Juice
What will happen to the rate of reaction if the temperature of a reaction is lowered?
The reaction will slow down.
1 CH4 + 4 S → 1 CS2 + 2 H2S
If the reaction above started with 36 grams of CH4 and 224 grams of S, determine the limiting reactant.
The LR is 224 grams of S
An unknown metal that weighs 32 grams is cooled from 95°C to 28°C. It is determined that the metal sample released 836 Joules of heat energy. What is the specific heat capacity of the metal?
C = 0.39 J/g°C
A gas has a volume of 0.3 L at -45°C. What would be the new volume of the gas if the temperature increases to 105°C?
The new volume of the gas will be 0.50L