Answers edited by Grace

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• How many total atoms are in .660 g of #P_2O_5#?
  
• What is the Doppler shift, and why is it important to astronomers?
  
• Question #f7fe6
  
• What is the density of methyl chloride gas, #CH_3Cl#, at STP?
  
• Question #eebf3
  
• A balanced lever has two weights on it, the first with mass #5 kg # and the second with mass #8 kg#. If the first weight is # 12 m# from the fulcrum, how far is the second weight from the fulcrum?
  
• Question #c75aa
  
• What are some examples of aggregate fruits?
  
• How much power is produced if a voltage of #15 V# is applied to a circuit with a resistance of #5 Omega#?
  
• What is the pH of a 0.0235 M #HCl# solution?
  
• A 0.310 mol sample of xenon gas has a volume of 22.0 L at a pressure of 0.470 atm. What is the temperature of the gas in degrees Celsius?
  
• Question #1bdb3
  
• What is energy input and output on earth?
  
• What is the balanced equation for the complete combustion of pentane (C5H12)?
  
• Hello. Can someone tell me why is DNA the genetic material in most of the organisms & not RNA? I need answers with reasoning & explanation. Thanks!
  
• How would you identify a limiting reagent in a chemical reaction?
  
• Question #f3a4d
  
• Question #3f1d8
  
• In the reaction represented by the equation #2Al_2O_3 -> 4Al + 3O_2#, what is the mole ratio of aluminum to oxygen?
  
• A car is traveling at a constant speed of 12 m/s. When the driver accelerates, the car reaches a speed of 26 m/s in 6 s. What is the average acceleration of the car?
  
• What is the functional group contained in the compound #CH_3-CH_2-NH_2#?
  
• What is the relationship between chlorophyll and the color of plants?
  
• Question #af34e
  
• How much work does it take to raise a #7 kg # weight #9 m #?
  
• How would you calculate the formal charge of NH3?
  
• Why do most of the plants grow on land and not in water? What are the reasons which makes land more favourable for growth of a plant as compared to water?
  
• Are acids or bases more dangerous? Why?
  
• How heavy will #6.14 * 10^25# atoms of gold be?
  
• How do cohesion and adhesion explain capillary action?
  
• Can you help me? From a 0.5 M #Na_2CO_3# solution having a volume of 300 ml, prepare a 0.075 M #Na_2CO_3# solution with a volume of 150 ml.
  
• Ryan hit a baseball with an acceleration of 40 m/#s^2#. The mass of the baseball is 0.5 kg. What is the force?
  
• What is the difference between a colloid and a solution?
  
• Question #2f296
  
• Summarize HSAB theory?
  
• Can you solve this? The concentration of the #Zn^(2+)# ions in blood serum is 1.2 ppm. Express this amount in terms of millimole/L and milliequivalent/L.
  
• What is the density of a material that has a mass of 5.6 g and when placed in a graduated cylinder changes the volume of water from 17.0 mL to 19.2 mL?
  
• Question #35e62
  
• How can you use the VSEPR theory?
  
• What is the final temperature after 840 J is absorbed by 10.0 g of water at 25°C?
  
• What is a metallic compound?
  
• Phosphoric acid is neutralized by a solution of sodium hydroxide. What is the name of the salt formed from the neutralization?
  
• Hello. Can someone help me with drawing hydrogen bonds among different molecules, with an example below? I understood how water molecules are linked to each other by hydrogen bonds. But I have a problem drawing these bonds in other biomolecules. Thanks!
  
• Calculate the volume of hydrogen required for complete hydrogenation of 0.25 #dm^3# of ethyne at STP?
  
• In a series circuit, what effect will adding more resistors to the circuit have?
  
• What is the percent composition of #K_3PO_4#?
  
• If a current of #5 A# passing through a circuit generates #435 W# of power, what is the resistance of the circuit?
  
• Complete the EQUATION:- NaOH (aq) + Na2SO4 (s) + Al (s) ----------> ?
  
• Question #9bc50
  
• I have a great confusion in significant and rounding off data, 834.8501 I have to be asked to round off to four significant, I have done it as 834.8, but teacher said it would be 834.9, she says rounding of 501 is greater than 500 so one is add into 8. ?
  
• Question #3c6bf
  
• Question #5a7e3
  
• What is the relationship between energy and the speed of light?
  
• How can I demonstrate Boyle's law?
  
• What is a general formula for an ester?
  
• A circuit with a resistance of #3 Omega# has a fuse with a capacity of #2 A#. Can a voltage of #5 V# be applied to the circuit without blowing the fuse?
  
• How fast will an object with a mass of #3 kg# accelerate if a force of #24 N# is constantly applied to it?
  
• How are animal behaviors measured and interpreted?
  
• Question #8fe41
  
• Question #7a915
  
• What is the electric current produced when a voltage of #9 V# is applied to a circuit with a resistance of #69 Omega#?
  
• Question #85744
  
• A current of 1.6 A is measured through a light-bulb when it is connected across a 110 V source. What power is dissipated by the bulb?
  
• How would you write a balanced chemical equation for CH4 reacting with oxygen gas to produce water and carbon dioxide?
  
• Question #21241
  
• How many moles of NaCl are in 0.350 L of a 1.5M solution?
  
• Question #2b111
  
• What are the similarities between the Rutherford and Bohr atomic models of the atom? How did Bohr improve on the Rutherford model?
  
• Question #4012f
  
• How does chemistry relate to our lives?
  
• Question #295a0
  
• What is the molecular formula of a compound if its empirical formula is #CFBrO# and its molar mass is 381.01 g/mol?
  
• Question #c3d97
  
• Question #269de
  
• What nuclear reaction is the basis of an atomic bomb?
  
• John took 45 minutes to bicycle to his grandmother's house, a total of four kilometers. What was his velocity in km/hr?
  
• A circuit with a resistance of #6 Omega# has a fuse melts at #5 A#. Can a voltage of #18 V# be applied to the circuit without blowing the fuse?
  
• What are the number of sub-levels and electrons for the first four principal quantum numbers?
  
• Question #6e96b
  
• Question #0899c
  
• What is a amino acid?
  
• How do you solve empirical formula calculations?
  
• In what order do electrons fill orbitals within a sublevel?
  
• What is rotational dynamics?
  
• A circuit with a resistance of #6 Omega# has a fuse that melts at #8 A#. Can a voltage of #49 V# be applied to the circuit without blowing the fuse?
  
• How do you find #sp^2# carbons?
  
• Which of the following doesn't give a precipitate when dil.HCl is added? 1. NaAlO2 2. Na2ZnO2 3. BiOCl 4. AgNO3 5. NaOCl
  
• Question #2c065
  
• What is the lattice energy?
  
• A ball with a mass of #9 kg# moving at #14 m/s# hits a still ball with a mass of #18 kg#. If the first ball stops moving, how fast is the second ball moving?
  
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