Thermo concepts
to find the change of heat, you subtract the ____ with the _____
a) Initial with the final
b) Final with the initial
b
Q=MCΔT
What's the quantity of heat energy when the mass is 30.0 g, specific heat is 0.129, and the temperature increased by 55 degrees Celsius?
212.85 joules
_Li + _O ->_Li2O
what is the mole ratio between Lithium and Lithium Oxide?
2 Li + 1 O -> 1 Li2O
Mole ratio- 2:1
If there is a mole ratio of 1:1 on the chemical reaction between Beryllium and Beryllium Chloride, how much Beryllium Chloride would be there if there were 14 moles of Beryllium?
14 moles
The higher the activation energy the higher the...
a) higher the energy to start the reaction
b) higher volume to start the reaction.
a
how much heat is gained if 24.8g of ice melts?
8283.2 J
_B+_N2 -> _BN
How many moles of Nitrogen goes into 13 moles of Boron Nitride?
2 B + 1 N2 -> 2 BN
6.5 moles
If the ratio of moles for Lithium and Lithium Nitride is 3:1 (Lithium is 3, and Lithium Nitride is 1), how much moles of Lithium is there when there's 9 moles of Lithium Nitride?
27 moles.
A cold ice bucket is put into a hot car. The ice melts, while the car is cooled down. Explain this.
a) The heat from the car went into the ice, creating a cooler environment.
b) the heat from the ice went into the car, creating a cooler environment.
a
How much is the mass when 75000 J of heat is gained when water steams?
33.186g (rounded to three decimal points).
_MgH2+_Li->_LiH+_Mg
How much grams of Li makes 3 moles LiH?
1 MgH2+2 Li -> 2 LiH + 1 Mg
20.82g
The closer the actual amount is to the theoretical, is the percentage higher or lower?
The percentage would be higher.
Would you use heat of vaporization of water or fusion of water when the question deals with the amount of heat gained when water steams?
You would use vaporization of water.
If the mass of an unidentified metal is 60.0g, the temperature changed from 20 C degrees to 60 degrees C, and absorbs 2152.8 J of heat, what is the metal?
Aluminum (0.897).
_Ca + _P -> _Ca3P2
What's the limiting reactant in the reaction if 65.0 g of Ca reacts with 40.0 g of P? What's the percentage yield if only 80.7 g of Ca3P2 is made?
3 Ca + 2 P ->Ca3P2
Limiting reactant: Ca 98.48
percentage yield: 81.95%
If there is a limiting reactant of 50 when making toys, how much can be made?
50.
Calorimetry depends on the law of...
law of conservation of energy.
60.5 g of a metal is heated to 40.5 C degrees, it's then placed into water containing 43.2 g at 18 C degrees. If the final temperature is 30 degrees, what's the specific heat of the object?
3.411 (rounded to three decimal points)
_C4H5+_O2->_CO2+_H2O
What is the limiting reactant when 120 g of C4H5 reacts with 45.1 g of O2? What's the mass in grams would be produced for CO2
4 C4H5 + 21 O2-> 16 CO2 + 10 H2O
The limiting reactant is O2 and the mass that can be made is 47.26 g.
In a situation you're making a bicycle, you have:
80 bike handles, 120 wheels, 130 bike seats. Assume that every other material you need has an unlimited number, what is the limiting reactant and how much bicycles can you make?
You can make 60 bikes.