Answers edited by Meave60

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• What is the first step of cellular respiration?
  
• A sample of rhenium (Re) is `"37.40% Re-185"` and `"62.60% Re-187"`. What are the atomic masses of these isotopes? The sum of the masses of the two isotopes is `"371.9087 u"`. Find the mass of the individual isotopes.
  
• Question #f2b92
  
• What is an example of an isotope abundance practice problem?
  
• What are the ways in which the mass of a body can be determined without using a laboratory balance?
  
• How can matter be classified?
  
• How do compounds differ from their component elements?
  
• How do you calculate mass using density and volume?
  
• Question #59866
  
• What is the oxidation state of chromium in the dichromate ion, `"Cr"_2"O"_7^(2-)`?
  
• Why does DNA polymerase proofread the new strand?
  
• How many molecules of water in `"6.25 g"`?
  
• Question #df3c0
  
• How many molecules of `"BF"_3"` are in `1.25` moles?
  
• Question #f79bb
  
• How do you evaluate the expression `|b+c|- a` given that `a=-1`, `b=2`, and `c=4`?
  
• What is density?
  
• Question #209d0
  
• Question #8855a
  
• What are some examples of precipitation?
  
• What are the molecular, complete ionic, and net ionic equations for the reaction between lead(II) nitrate and ammonium phosphate?
  
• What is the correct name for `"SO"_3"`?
  
• Convert the mass of your limiting reactant to a number of moles.
  
• What number is `3/4`% of 16?
  
• Question #922a3
  
• What is the chemical formula of calcium chloride?
  
• What happens when a metal reacts with an acid?
  
• How many moles of electrons are in one kilogram?
  
• A gas has a volume of 435 mL at `25^@"C"` and `"98.7 kPa"`. What would the volume of the gas be at STP?
  
• Question #bab32
  
• What are the products of the reaction between the aqueous solutions of `"Na"_2"SiO"_3"` and `"Cu"("NO"_3)_2"`?
  
• A ball of aluminum (cp = 0.897 J/g°C) has a mass of 100 grams and is initially at a temperature of 150°C. This ball is quickly inserted into an insulated cup with 100 ml of water at a temperature of 15.0°C. What will be the final, equilibrium temperature of the ball and the water?
  
• How do you balance a single replacement reaction?
  
• How much energy is required to raise the temperature of a `"36.00 g"` sample of ice from a temperature of `-30.00^@"C"` to a temperature of `"85.00"^@"C"`? The heat of fusion, `H_"f"`, of water is `"334 J/g"`.
  
• What is the wavelength of an electron with a velocity of `3.85xx10^6" m/s"`?
  
• Question #5c044
  
• How do you calculate the percent yield of recrystallized product?
  
• Question #51278
  
• A gas occupies 175 mL at a pressure of 825 torr. What is the volume when the pressure is decreased to 415 torr?
  
• What is the rate of reaction if `"12.0 mL H"_2"` gas is produced in `"30.0 s"` at STP?
  
• Question #feca2
  
• What is double bonding?
  
• What is density?
  
• What are nucleotides?
  
• How can a mutation lead to evolution?
  
• What is the net force acting on a yo-yo when it doesn't move?
  
• The temperature measured in an experiment was `"64.9"^@"C"`. The theoretical temperature is `"55.0"^@"C"`. What is the percent error?
  
• How do covalent bonds form?
  
• Question #f1fda
  
• How are the nitrogenous bases attached to the sugar-phosphate backbone of DNA and RNA?
  
• Are viruses living?
  
• Question #8b63a
  
• Question #5f1ff
  
• Question #b69fa
  
• What type of reaction occurs when barium nitrate reacts with sulfuric acid?
  
• What are the molecular, word, complete ionic, and net ionic equations for the reaction between `"AuBr"_3"` and `"H"_2"CO"_3"`?
  
• Question #19ae7
  
• What are orbitals?
  
• What determines whether a solid is soluble in water?
  
• How to determine the wavelength and frequency of electromagnetic radiation?
  
• What is the ionic compound with the formula Pr2(SeO4)3?
  
• Question #de777
  
• Question #dd886
  
• Cl-35 has an atomic weight of `"34.9689` and Cl-37 has an atomic weight of `"36.9695`. What is the percent abundance of Cl-35?
  
• Question #47500
  
• Question #347fb
  
• Question #942bc
  
• Question #f8d64
  
• What are dehydration synthesis reactions?
  
• Is the `"O-O"` bond in `"H"_2"O"_2"` polar covalent or nonpolar covalent?
  
• Question #942bc
  
• Can you explain the formation of an ionic compound from zinc and chlorine?
  
• Are lone pairs of electrons involved in chemical bonding?
  
• Question #916e4
  
• How do you calculate atmospheric pressure at an altitude?
  
• What is the mass of `"0.475 mol"` of calcium arsenate, `"Ca"_3"(AsO"_4)_2"`?
  
• A container holds three gases: helium, argon, and xenon. The partial pressures are 0.450 atm helium and 0.350 atm argon. The total pressure is 3.00 atm. What is the partial pressure of xenon?
  
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