Answers created by Chuck W.

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• Question #35197
  
• The half-life of an element is #5.8 x 10^11#. How long does it take a sample of the element to decay to #2/5# its original mass?
  
• Red light of frequency #4.37 x 10^14# Hz is required to excite a certain electron. What energy did the electron gain from the light?
  
• What is the number of molecules of 140 g of CO?
  
• Question #c1b5b
  
• Question #dd2c7
  
• Question #d7c8a
  
• Question #2add8
  
• Why can two #s# orbitals NOT be degenerate?
  
• What is the formula for calculating the pressure of a gas?
  
• Container A holds 757 mL of ideal gas at 2.60 atm. Container B holds 164 mL of ideal gas at 4.80 atm. If the gases are allowed to mix together, what is the resulting pressure?
  
• Question #197e4
  
• Suppose #"2.83 g"# of ammonium chloride solid is placed into a closed, evacuated rigid container, and allowed to decompose at a certain temperature. If 40% of it decomposed into ammonia and hydrogen chloride gas, what is #K_c# for this reaction?
  
• How do you determine the electron configuration of Cl?
  
• How much work does it take to raise a #5 kg # weight #14 m #?
  
• Question #0bc73
  
• A container has a volume of #18 L# and holds #9 mol# of gas. If the container is compressed such that its new volume is #8 L#, how many moles of gas must be released from the container to maintain a constant temperature and pressure?
  
• How do water molecules dissolve a salt?
  
• How can metals be distinguished from non metals on the periodic table?
  
• The density of aluminum is #2.70# #g##/cm^3#. What is the mass of a solid piece of aluminum with a volume of #1.50# #cm^3#?
  
• Question #890cf
  
• Question #92e99
  
• Question #6f0e8
  
• What is the oxidation state of each element in #COH_2#?
  
• Question #dc3c2
  
• Question #f7a41
  
• A 3.0 mL sample of #HNO_3# solution is exactly neutralized by 6.0 mL of .50 M #KOH#. What is the molarity of the #HNO_3# solution?
  
• What are the impacts of acid rain?
  
• Question #6181b
  
• Question #fb741
  
• Question #6aab1
  
• What does binding energy measure?
  
• Question #0ef49
  
• Are OXIDANTS and OXIDIZING AGENTS the same thing?
  
• How can low temperatures for superconductivity be reached?
  
• Question #87123
  
• What mass of oxygen gas can be be produced when 1.15 g sodium peroxide reacts with excess water?
  
• Question #6f539
  
• Question #e675f
  
• Question #5dbac
  
• Question #d2fe3
  
• How does concentration effect dynamic equilibrium?
  
• Question #24a44
  
• How do elements make up compounds?
  
• What quantum numbers refer to a 7s orbital?
  
• How can I calculate wavelength of a photon?
  
• Question #3d61b
  
• Why is FeCl3 the product, when Fe and Cl2 reacts and not FeCl2?
  
• Question #94dc7
  
• Question #21639
  
• Question #557f1
  
• Question #e4180
  
• Question #bc43f
  
• How is Keq related to molality?
  
• Question #8954c
  
• Question #babca
  
• Question #16ac1
  
• Question #85cb9
  
• Question #a7b16
  
• Question #f6ebb
  
• Question #b60b5
  
• Is magnetic force perpendicular to the magnetic field?
  
• What is the law of mass action? What determines the direction of a chemical reaction in a formula equation?
  
• Question #597fc
  
• What is an example of a thermochemistry practice problem?
  
• What is the wave particle duality of electrons?
  
• Has Heisenberg's Uncertainty Principle been proven?
  
• How can I calculate the molar mass?
  
• Question #b2485
  
• How are metals similar to metalloids?
  
• How does the degree of dissociation affect ka?
  
• How is the equilibrium constant related to Gibbs free energy?
  
• How can I calculate osmolarity of dextrose?
  
• Is a metallic bond the only type of chemical bonding a metal can exhibit?
  
• Can a polarized object have a net charge of zero?
  
• Why is positron emission important?
  
• What conditions must be met in order for a reaction to be considered exothermic?
  
• What are some examples of orbital hybridization?
  
• Why do supersaturated solutions crystallize?
  
• How can I calculate delta G of a reaction?
  
• How can I explain the difference between quantitative and qualitative methods?
  
• Why is enthalpy an extensive property?
  
• What is a galvanic cell made of?
  
• How does the rate of reaction change when reactants mix?
  
• How can polar molecules pass through a membrane?
  
• If the frequency of a wave is 2.0 cycles per second and its speed is 0.04 meter per second,what is the wavelength of the wave?
  
• How does nuclear energy change into electricity?
  
• How is dynamic equilibrium related to vapor pressure?
  
• What is the boiling point elevation?
  
• Are matter waves the same as de Broglie waves?
  
• Why are ionic compounds solid at room temperature?
  
• Which of the following molecules has a dipole moment? CCl4, H2S, CO2, BCl3, Cl2
  
• What is the ionization of a strong acid?
  
• Why is ideal gas law important?
  
• How does atmospheric pressure change in the troposphere?
  
• Can dynamic equilibrium be disrupted?
  
• What are some examples of anodes?
  
• Will a reaction with a negative ΔH° be spontaneous?
  
• Why is hydrogen included in the metal activity series?
  
• How many atomic orbitals are there in an h subshell?
  
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