The Atom
Which particles are found in the nucleus of an argon atom?
protons and neutrons
The degree of polarity of a covalent bond between two atoms is determined by calculating the difference in their...
polarity
Name two processes in which a substance releases energy
freezing, condensation, deposition
What is the general formula for the homologous series that included ethene?
CnH2n
Show a numerical setup for calculating the percent composition by mass of oxygen in the sodium hydrogen carbonate (gfm = 84 g/mol)
((3x16)/84) x100
State the electron configuration that represents an atom of chlorine in an excited state.
2-7-8
State the molecular polarity of a CO2 molecule
nonpolar
What is the amount of heat absorbed when the temp of 75 grams of water increases from 20. C to 35 C
4700
In which type of nuclear reaction do two light nuclei combine to produce a heavier nucleus?
fusion
A 26.7-gram sample of which element has a volume of 3.00 cubic centimeters at room temperature?
Ni
Mg and Ca have similar chemical properties because their atoms in the ground state have
the same number of ve-
Based on Table S, determine the electronegativity difference between oxygen and calcium in calcium oxide.
2.4
Convert 23 C to K.
296 K
Based on Table N, identify the decay mode of tritium.
Beta
Solid aluminum has a specifi c heat capacity of 0.90 J/g•K. How many joules of heat are absorbed to raise the temperature of 24.0 grams of aluminum from 300. K to 350. K?
1,100 J
Explain, in terms of subatomic particles, why atoms of H-1, H-2, and H-3 are each electrically neutral.
Each atom has an equal number of protons and electrons.
ION QUESTION: Identify the negative ion in the NaOH(aq) used in the titration.
OH-
State a change in temp and pressure of a gas that would cause it to behave more like an ideal gas.
increase in temp, decrease in pressure
Write the chemical name for CH3COOH
ethanoic acid
In a titration using a pH meter, 16.0 milliliters of 0.18 M NaOH(aq) exactly neutralizes a 24.0-milliliter sample of HCl(aq) in a fl ask.
0.12
A student determines the density of a copper sample at room temperature to be 9.46 g/cm3 . Based on Table S, what is the student’s percent error in determining the density of copper?
5.6%
FREE POINTS
:D
A 200.-milliliter sample of CO2(g) is placed in a sealed, rigid cylinder with a movable piston at 296 K and 101.3 kPa. Determine the volume of the sample of CO2(g) if the temperature and pressure are changed to 336 K and 152.0 kPa.
151mL to 151.4mL
Determine the fraction of an original sample of the radioactive isotope used to test for thyroid problems that remains unchanged after 24.063 days.
1/8
Determine the percent composition by mass of hydrogen in water.