The “calories” listed on food packaging are actually kilocalories and a distinction is often made by capitalizing the C when referring to the calories in food. 1 food calorie= 1 Cal= 1kcal A serving of pancakes contains 230 Cal, how many Joules (J) would a serving contain?  1 cal = 4.184 J (here cal is not a food calorie) 

A researcher reacted 25.5 g of aluminum sulfate in excess in hydrogen gas. When they measured the mass of aluminum there was 3.12 g. What is the percent yield of this reaction? 

Determine the signs of heat and work based on the following scenarios: The reaction is endothermic q=[q] The volume increases w=[w]. 

Sodium is a very reactive metal that reacts with water to produce sodium hydroxide and hydrogen gas. If 12.6 g of sodium reacts with excess water how much hydrogen gas (in grams) can be produced? 

For the following hypothetical reaction how much heat is released in kilojoules (kJ) if 210.0 g of propanol (C3H7OH ) is added to excess oxygen?   

Answer the following questions about what happens when hydrobromic acid (HBr) and calcium hydroxide (Ca(OH)2) react.   

Determine if the following are a strong electrolyte, weak electrolyte, or not an electrolyte.  Potassium hydroxide (KOH) [1] Lactic acid (C3H6O3) [2] Methanol (CH3OH) [3]

Which of the following radiation type will cause pyrimidine dimers to occur?

A lab has a stock solution of 5.50 M hydrochloric acid. A scientist needs 0.500 L of 0.410 M hydrochloric acid, how many milliliters of the stock solution does the scientist need to use? 

What is the oxidation number on the sulfur atom in the polyatomic ion sulfate (SO42-)?