Tris (C4H11NO3) is commonly used as a buffer component in biochemistry research. How many grams of Tris is needed to create a 350. mL solution of 0.0390 M Tris solution? 

Which of the following is/are oxidation reduction (Redox) reactions? 

A calorimeter containing 769.0 g of water at an initial temperature of 25.00 °C was used to measure the heat involved in a reaction. When the reaction was finished, the temperature of the water increased to 33.90 °C. Is the reaction endothermic or exothermic and how much heat energy involved in the reaction? (swater=4.184 J/goC)  The reaction is [1]. The amount of heat exchanged is [2]. 

What is the pH when [H3O+]= 8.76 x 10-4 M? 

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.