Physical Chemistry Answers

A reaction is of first order in a reactant A and of second order in a reactant B . How is the rate of this reaction affected when
a) The concentration of B alone is increased to three times?
b)The concentration of A as well as B are doubled ?

methane is a fuel. it completely burns to form carbondioxide and water. when one mole of methane is burned 890 kj of energy is released
i don't know they've given these some symbols nd i don't how to solve them let me try writing them
H-C-H apart from that one H is over the C and the other one is below C than +2o=o gives you o=c=o+2 o and H on both the upper sides

Suppose 1900 J of heat energy are put into a sample of liquid water at 21°C, and the final temperature of the water is 76°C. How many grams of water are present?

I dissolved two different white solids into water. One solid dissolved and gave off heat and the other became cold. Reading various texts online, I was not sure if these were physical or chemical changes. Some texts say if these solids are salts then these are physical changes. Other texts say since ionic bonds are broken, these are chemical changes. Which one is correct?

10. You have received an order for 3 L of 0.9% NaCl to be infused by an infusion set rated at 60 gtt/mL set at 60 gtt/min. How long will it take to infuse the 3 L of fluid?

How many grams of dextrose are in 500ml of D50W?

Provide symbols (where appropriate) and definitions for the following terms:
(a) Enthalpy change
(b) Entropy change
(c) Free-energy change
(d) Spontaneity process
(e) Non-spontaneous process

Calculate the moles of Cl atoms in .0555g of C2H4Cl2?

What is meant by 'order' of a reaction?