Module 2 Assignment
Which of the following elements are in the noble gas column of the periodic table of the elements?
Krypton Helium
Estimate of the energy (in joule) contained in a quart of soda.
1,520,000
A 19.1 kilogram shotput is held 1.7 meters above the ground. What is the gravitational potential energy of the shotput relative to the ground? Use exact numbers; do not estimate.
324.7
What is the energy density (energy per mass) of butter and similar foods?
45 MJ/kg
What is the energy density (energy per mass) of gasoline?
45 MJ/kg
What are the roles of a catalyst in the energetics of a chemical reaction?
A catalyst is not consumed by the reaction. A catalyst increases the rate of reaction.
Match the quantity on the left with the beset answer on the right.
Chemical Element- Different number of protons Isotope- Different number of neutrons Molecule- Two or more atoms Ionization- Electron freed from an atom
Match the quantity with their unit.
Energy- Joule Speed- Meter per Second Acceleration- Meter per Second per Second Power- Watt
You are given 12 grams of an unknown substance. How you would accurately determine the precise composition of the unknown substance?
Excite a small portion of it and identify the spectral lines.
Glow sticks are an example of what type of chemical reaction?
Exothermic
What happens energetically when chemical bonds are formed?
Forming bonds releases energy.
The activation energy of a chemical reaction is the...
energy input needed to get the atoms to start sharing their electrons.
Combining hydrogen and oxygen to make water
releases a lot of energy.