Chemistry Homework Help: Answers & Questions Page 68

• Any important information about the element Gold (Au)? i.e. uses, characteristics, history, etc.

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• If silver has a density of 10.5 ##"g/cm"^3## and gold has a density of 19.3 ##"g/cm"^3##, which would have the greater mass, 5 ##"cm"^3## of silver or 5 ##"cm"^3## of gold?

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• How can I write nuclear equations for alpha decay?

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• How many liters is 3.75 kiloliters?

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• How to learn the valancies of the first 20 elements?

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• What is thermochemistry?

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• How can you tell if a molecule is polar or not?

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• Find [H+] in an aqueous solution that is 0.50 M in NaNO2 and is 1.40 M in HNO2. For HNO2(aq), Ka = 4.5 × 10–4.?

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• How do you recognize a molecular compound from its formula?

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• What is ##E_"cell"^@## of the cell?

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• What is the bond used between zinc acetate? How to learn to write such formulas?

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• Why are alkyl groups hydrophobic?

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• How many lone pairs of electrons are on the ##Xe## atom in ##XeF_6##? A) 0 B) 3 C) 2 D) 1

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• What is potassium and iron combined?

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• What is the molecular shape of ICl2^-1 , NO2 & ICl4^-1?

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• What do parentheses mean in chemical formulas?

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• How can we determine whether a compound is oxidant or reductant by its molecular formula?

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• Why are molecules important?

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• How do I determine the molecular shape of a molecule?

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• What is an example chemical energy practice problem?

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• What is titration?

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• Is tryptophan an aromatic amino acid?

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• Silver iodide, ##AgI##, has a Ksp value of ##8.3 xx 10^-17##. What is the solubility of ##AgI##, in mol/L?

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• How do you name alkenes with alcohols?

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• How to calculate the effective nuclear charge of the 1s electrons in helium ?

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• What is the solubility (in M) of PbCl2 in a 0.15 M solution of HCl? The Ksp of PbCl2 is 1.6 × 10-5?

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• What are the oxidation numbers in the compound H2SO4?

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• How does thermal energy affect the three states of matter?

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• What are examples of physical properties? Chemical properties?

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• How can the enthalpy change be determined?

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• At ##20°C##, the density of copper is ##8.9## ##g####/####cm^3##. The density of platinum is ##21.4## ##g####/####cm^3##. What does this tell you about how the atoms are "packed" in each material?

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• State the Pauli exclusion principle in your own words. Explain why the Pauli exclusion principle is important to the understanding of the periodic table?

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• What is polarity?

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• What is purging? why mostly purging with nitrogen is preffered? and how purging is done in industries?

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• CuO(s)+HCl(aq) equation and net ionic equation ?

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• In a word equasion, eg Copper (II) Flouride, what does the "(II)" mean?

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• How can I calculate the partial pressure of a dry gas?

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• In the ideal gas equation, which term is always constant?

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• How are absolute temperature and volume of a gas related?

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• What does the cytoplasm do in a plant cell?

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• What happens to the number of protons in the nucleus as you go across a period? Use this to explain the trends in atomic radius and ionization energy across a period.

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• Use the Rydberg equation to calculate the wavelength in nanometers of the spectral line for which n2=6 and n1=3. Would we be expected to see the light corresponding to spectral line?

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• How do you calculate the energy of a photon of electromagnetic radiation?

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• How long does it take a 100.00g sample of As-81 to decay to 6.25g?

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• How can I draw the Lewis structure for CO?

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• What is the isotope notation for lithium?

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• How do I translate chromium Oxide into formula? Please explain a little more in depth as I know chromium has multiple charges.

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• How many grams of NaCl are produced when 80.0 grams of O2 are produced? 2 NaClO3 ---> 2 NaCl + 3 O2

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• How can I draw Fischer projections from wedge and dash?

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• What is the metric unit of measuring the volume of liquids?

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