Answers edited by Grace

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• How can I demonstrate Boyle's law?
  
• How can you use the VSEPR theory?
  
• 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 #c75aa
  
• How do you solve empirical formula calculations?
  
• Question #269de
  
• Question #7a915
  
• How many moles of NaCl are in 0.350 L of a 1.5M solution?
  
• 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.
  
• 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?
  
• 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 electric current produced when a voltage of `9 V` is applied to a circuit with a resistance of `69 Omega`?
  
• Question #6e96b
  
• How are animal behaviors measured and interpreted?
  
• In what order do electrons fill orbitals within a sublevel?
  
• 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 is a metallic compound?
  
• Question #f3a4d
  
• Question #21241
  
• What is energy input and output on earth?
  
• Are acids or bases more dangerous? Why?
  
• Question #9bc50
  
• Question #4012f
  
• 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?
  
• Question #3f1d8
  
• 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!
  
• Question #eebf3
  
• How does chemistry relate to our lives?
  
• How would you calculate the formal charge of NH3?
  
• Which of the following doesn't give a precipitate when dil.HCl is added? 1. NaAlO2 2. Na2ZnO2 3. BiOCl 4. AgNO3 5. NaOCl
  
• 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?
  
• What is the lattice energy?
  
• What are the similarities between the Rutherford and Bohr atomic models of the atom? How did Bohr improve on the Rutherford model?
  
• What is the functional group contained in the compound `CH_3-CH_2-NH_2`?
  
• Question #5a7e3
  
• What is a general formula for an ester?
  
• How fast will an object with a mass of `3 kg` accelerate if a force of `24 N` is constantly applied to it?
  
• 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?
  
• What is the pH of a 0.0235 M `HCl` solution?
  
• Question #2f296
  
• Complete the EQUATION:- NaOH (aq) + Na2SO4 (s) + Al (s) ----------> ?
  
• 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?
  
• In the reaction represented by the equation `2Al_2O_3 -> 4Al + 3O_2`, what is the mole ratio of aluminum to oxygen?
  
• Question #2c065
  
• How do cohesion and adhesion explain capillary action?
  
• 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?
  
• How would you identify a limiting reagent in a chemical reaction?
  
• What is the difference between a colloid and a solution?
  
• Question #af34e
  
• What is the density of methyl chloride gas, `CH_3Cl`, at STP?
  
• How many total atoms are in .660 g of `P_2O_5`?
  
• Question #c3d97
  
• What is the balanced equation for the complete combustion of pentane (C5H12)?
  
• 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?
  
• What is the percent composition of `K_3PO_4`?
  
• How do you find `sp^2` carbons?
  
• How much work does it take to raise a `7 kg` weight `9 m`?
  
• Question #0899c
  
• 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.
  
• What is the relationship between chlorophyll and the color of plants?
  
• Question #2b111
  
• 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?
  
• What is the final temperature after 840 J is absorbed by 10.0 g of water at 25°C?
  
• John took 45 minutes to bicycle to his grandmother's house, a total of four kilometers. What was his velocity in km/hr?
  
• What is the relationship between energy and the speed of light?
  
• Question #85744
  
• What is the Doppler shift, and why is it important to astronomers?
  
• How would you write a balanced chemical equation for CH4 reacting with oxygen gas to produce water and carbon dioxide?
  
• What are some examples of aggregate fruits?
  
• What nuclear reaction is the basis of an atomic bomb?
  
• Question #295a0
  
• Calculate the volume of hydrogen required for complete hydrogenation of 0.25 `dm^3` of ethyne at STP?
  
• What is the molecular formula of a compound if its empirical formula is `CFBrO` and its molar mass is 381.01 g/mol?
  
• Question #1bdb3
  
• How heavy will `6.14 * 10^25` atoms of gold be?
  
• Phosphoric acid is neutralized by a solution of sodium hydroxide. What is the name of the salt formed from the neutralization?
  
• 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 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?
  
• What are the number of sub-levels and electrons for the first four principal quantum numbers?
  
• Question #f7fe6
  
• Question #35e62
  
• 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!
  
• Question #3c6bf
  
• What is a amino acid?
  
• What is rotational dynamics?
  
• If a current of `5 A` passing through a circuit generates `435 W` of power, what is the resistance of the circuit?
  
• Question #8fe41
  
• In a series circuit, what effect will adding more resistors to the circuit have?
  
• Summarize HSAB theory?
  
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