Molecules & Atoms
SPECIAL QUESTION!
Any team can win these points if every team member does their best interpretive dance of the different types of chemical reactions :)
Looking good!
M1V1 = _________
M2V2
What is the difference between endothermic and exothermic reactions?
Endothermic: Pulls heat into an object/area
Exothermic: Expels heat
N2 + 3H2 → 2NH3
How many moles of H2 are needed to produce 10.0 moles of NH3?
15 moles
DOUBLE JEOPARDY
Identify in the following scenarios if the boiling point of water would change or not.
Scenario 1
I am adding alcohol to the water.
Scenario 2
I am increasing the volume of the water I am boiling.
In scenario 1, the boiling point WOULD change
In scenario 2, the boiling point WOULD NOT change
What is another way to say the following compound?
2H2 O
Dihydrate
True or false: S2Cl2 is a strong electrolyte when dissolved in water
FALSE: S2Cl2 is NOT a strong electrolyte because it is NOT an ionic bond!! (S2Cl2 is a covalent bond, ionic bonds are the ones that are strong electrolytes)
A sample of a compound is added to distilled water in a clean beaker. A reaction occurs, and the water temperature increases rapidly. Was the reaction endothermic or exothermic?
Exothermic
When the equation is balanced, what is the coefficient for H2O?
___NH3 + ___O2 → ___N2 + ___H2O
6
What is specific heat capacity?
The amount of energy needed to raise one gram of a substance one degree Celsius
How many molecules are in 1.00 mole of N2O5?
6.02x1023 molecules
True or False: NaNO3 is a strong electrolyte when dissolved in water.
TRUE - NaNO3 IS a strong electrolyte!!!
If an endothermic reaction occurs, will the products feel hotter or colder than before?
COLDER :)
2C2H6 + 7O2 → 4CO2 + 6H2O
How many moles of H2O can be produced from 3.5 moles of O2?
3 moles
Use the equation below to answer the following question.
BaCl2 (aq) + Na2SO4(aq) -> 2NaCl(aq) + BaSO4(s)
The theoretical yield of BaSO4 is 59.93 g. If 41.32 g of BaSO4 are produced from the reaction shown above, what is the percent yield of BaSO4?
68.95%
Percent Yield = Actual yield/Theoretical yield
How many molecules are in 0.500 mole H2O?
3.01 x 1023 molecules :)
Why is NaCl able to dissolve in water?
(Hint: think polarity!)
because sodium ions are attracted to the partial negative charge of oxygen
FREEBIE QUESTION!
Every team can win these points if they give the opponent teams a high five and tell them, "You're going to do great on the test!"
YOU ARE GOING TO DO GREAT ON THE TEST
When the equation is balanced, what is the coefficient for CO2?
___Fe2O3 + ___CO → ___Fe + ___CO2
3
2HCl(g) ← → H2 (g) + Cl2 (g)
Would an increase in reaction temperature cause shift in the equilibrium of the above reaction?
YASS!
If we increased the reaction temperature, then the speed of the reaction would no longer be the same. This means that the equilibrium point would change. :)
How many atoms are present in 179.0 g of iridium?
5.606 ×10 23 atoms
What volume of 2.5 M sodium phosphate, to the nearest tenth of a liter, must be used to make 6.0 L of 0.70 M sodium phosphate?
1.68 L
Is melting ice an endothermic or exothermic reaction?
Endothermic
2SO2 + O2 → 2SO3
How many moles of SO3 can be produced from 1.5 moles of O2?
3 moles
A 6.0 g sample of aluminum with a specific heat of 0.70 J/(g °C) was heated from 21.1°C to 30.1°C. How much heat, to the nearest joule, did the aluminum gain?
38 (37.8) joules!