Answers created by Rita

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• What type of radioactive decay produces no change in mass number?
  
• How many grams are there in #7.50 x 10^23# molecules of #H_2SO_4#?
  
• Given that 0.28 g of dry gas occupies a volume of 354 mL at a temperature of 20°C and a pressure of 686 mmHg, how do you calculate the molecular weight of the gas?
  
• How to find the nucleon number with the information of the number of protons and neutrons?
  
• How do metallic bonds differ from covalent bonds?
  
• A 25-g piece of an unknown metal is heated to 100°c and then placed into a calorimeter containing 45g of water at a temperature of 23.0°c.The final temperature of both is 27.0°c. What is the specific heat of the unknown metal? Show the steps
  
• At a constant temperature, a gas that exerted a pressure of 2.43 atm and that occupied 1.87 L is compressed until its pressure is 6.35 atm. What is the final volume?
  
• If the spin of one electron in an orbital is spin-up, what is the spin of the other electron in that orbital?
  
• What is the distance between #(3,5)# and #(6,2)#?
  
• A balloon is filled with 4.57 liters of air at room temperature(23.3 deg C). Liquid nitrogen is poured over the balloon until the gas is at a temperature of -197 degrees C. What volume with the gas have inside the balloon?
  
• A block of lead, with dimensions 2.0 dm x 8.0 cm x 35 mm, has a mass of 6.356 kg. How do you calculate the density of lead in #g/(cm^3)#?
  
• How many atoms are in 75 grams of calcium?
  
• What are the atomic number and atomic mass of the element formed when 218Po emits a beta particle?
  
• The specific heat capacity of an unknown liquid is #0.32# #"J"/("kgK")#. The density of the liquid is #0.0321# #"g/mL"#. If a chemist applies #243# #"J"# of heat to #300# #"mL"# of this liquid starting at #27.1 ^@# #C#, what is the final temperature?
  
• How do you use the distributive property to simplify #7(z - 4)#?