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• How many joules does it take to melt 35 g of ice at 0° C?
  
• How much heat is required to warm 1.30 kg of sand from 30°C to 100°C?
  
• How would 0.073 be written in scientific notation?
  
• Question #67003
  
• How can you determine periodic table charges?
  
• Question #02541
  
• Do atoms/molecules change their arrangement during a physical change?
  
• How many molecules are there in 2.3 grams of #NH_4SO_2#?
  
• The neurotransmitter norepinephrine is 56.8% carbon, 6.5% hydrogen, 28.4% oxygen, and 8.3% nitrogen. Its molar mass is 169 g/mol. What is the molecular formula of this substance?