Chemistry Homework Help: Answers & Questions Page 57

• How do you convert 28.0 centimeters to meters with the correct number of significant figures? And how do you convert 1000 meters to kilometers with the correct number of significant figures?

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• What is the valency of alkaline earth metal?

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• How to draw lewis structure NH3?

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• An aqueous solution of lead II phosphate is added to an aqueous solution of potassium iodide. When the two colorless solutions mix, a bright yellow precipitate forms in a double replacement reaction. What is the balanced chemical equation?

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• ##CaCO3 + 2HCl -> CaCl2 + H2O + CO2## If it takes 0.0456 mol ##HCl## to completely react with all the ##CaCO3## in a 2.50g eggshell sample, a.) What is the mass of ##CaCO3## in the eggshell sample? b.) % ##CaCO3## in the eggshell sample?

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• Why is the periodic table organized by atomic number rather than alphabetically?

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• What is the principal quantum number for the outermost electrons in a Ca atom in the ground state?

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• What is the simplest formula for chromium (II) and selenide?

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• What volume of 0.255 M K2S solution is required to completely react with 170 mL of 0.110 M Co(NO3)2?

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• What is the formula for magnesium iodide?

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• How do you write an equation to represent "Calcium sulfite decomposes to form calcium oxide and sulfur dioxide"?

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• Do both elimination reactions, E1 and E2, follow Zaitsev’s rule?

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• Converting centiliters to nanoliters: can you please explain the process of this? 35.7cL = ?nL

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• Why are strong acids and bases also strong electrolytes?

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• What is a chromophore?

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• What is the valence electron configuration for chlorine?

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• How would you explain the phase diagram of sulphur?

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• Can anyone explain to me how to identify epimers and anomers in carbohydrates (sugars)? Also, state examples.

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• How many chiral centers are there in cholesterol?

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• Can I separate acetic anhydride from asprin?

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• What is the difference between matter and substance?

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• The Ksp for Zn(OH)2 is 5.0x10^-17 . Determine the molar solubility of zn(OH)2 in a buffer solution with pH of 11.5 ?

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• Explain the functions of the parts of a cathode ray tube?

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• How many moles of chloride ions, Cl- , are there in 0.50g of copper(II) chloride, CuCl2?

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• What is the definition of the latent heat of fusion?

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• 500 mL of hydrogen at 27°C and 3 atmospheres pressure is compressed to 100 mL at 100°C. What is the new pressure in atmospheres?

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• What does Ammonium phosphate + Barium acetate yield?

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• What does the "2, 3" part of this compound mean? 2,3-dimethylbutane.

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• If a point is below the curve on a solubility chart, than it is saturated or unsaturated?

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• A track runner ran exactly 400 meters in 45.23 seconds. what was the average speed in miles per hour?

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• Fe(26) has eight(8) valence electrons, but it's valency is 2 and 3. How can I calculate this?

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• Why lead chloride is soluble in hot water but not in cold water?

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• What is the definition of pH?

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• How do you balance a single replacement reaction?

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• All atoms of a given element contain the same number of protons and the same number of neutrons?

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• What are the noble gases, the representative elements, the transition elements, and the inner transition elements?

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• What is the formula for zinc bromide?

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• What is the electron configuration of copper?

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• How do you write chemical equations for combustion reactions?

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• How do physical properties of metals differ from nonmetals?

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• Is evaporation a chemical or physical change?

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• Is an endothermic process an example of a physical or chemical change?

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• How does a solute differ from a solvent?

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• What does the word aqueous mean?

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• How many ions in, Mg(NO3)2?

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• How does the electron cloud model differ from the Bohr model?

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• What are some examples of matter?

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• Why is water liquid where as H2S is gas at room temperature?

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• What is the scientific definition of half life?

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• What is an ion?

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