Cyclobutadiene combusts with oxygen according to the following reaction:
C4H4 + 5O2 --> 4CO2 + 2H2O
Determine the magnitude of the estimated enthalpy change of this reaction, in kilojoules per mole of reaction. Record just the numerical value. Show your work!
Question 12
12.
An experiment is done to determine the calories released per gram of peanut when combusted. Measurements are taken and recorded in the table below.
According to this data, how many Calories (kilocalories) does each gram of peanut contain? Record just the numerical value, and not the units. Show your work!
Without the strong nuclear force, the nuclei of atoms would
collapse into themselves.
fly apart.
gain electrons.
double in size.
To what element does polonium-208 (atomic number 84) decay when it emits an alpha particle?
210Pb
210Po
204Pb
214Rn
Reaction _____ in the figure shown is an example of a fission reaction.
What particle is needed to complete this nuclear reaction?
The image above represents a reaction that (select all that apply)
results in products with less potential energy
results in products with increaed potential energy
would feel cool to the touch
would feel warm to the touch
Units of energy include which of the following? (Select all that apply)
calories
Newtons
Kelvin
joules
Chemicals have chemical potential energy because (select all that apply)
atoms can be attracted or repelled from other atoms
atoms are in motion
chemical bonds can break and the atoms can reach lower energy configurations
atomic nuceli are unstable
In order to determine the energy content of food, chemists (select all that apply)
have the food undergo nuclear decay
burn the food
measure the temperature change in a calorimeter
measure the wavelength of light in the emission spectra of the food
Endothermic reactions result in: (Select all that apply)
energy given off to the surroundings
energy absorbed from the surroundings
the substance feeling cold
the substance feeling hot
Convection currents in the Earth’s crust (select all that apply)