A 35.00 mL solution of 0.25M HF is titrated with a standardized 0.1408 M solution of NaOH at 25C.

a.What is the PH of the HF solution before titrant is added?

b.How many milliliters of titrant are required to reach the equivalence point?

c.What is the PH at 0.5ml before the equivalence point?

d.What is the PH at the equivalence point? e.What is the PH at 0.5 ml after the equivalence point?

A block of mass 2 kg and a block of mass 3 kg are sliding on a frictionless surface. They collide and stick together. Before the collision the first block was travelling at 5 m/s in the positive x direction. After the collision the two blocks are travelling at 6 m/s in the negative x direction. What was the x component of the velocity of the second block before the collision?

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 10.0 m/s. the cliff is 50.0 m above a flat horizontal beach. (a) how long after being released does the stone strike the beach before the cliff? (b) find the speed just before the stone strikes the beach. (c) find the traveling horizontal distance for the stone

A 890 g wooden block is initially at rest on a rough horizontal surface when a 15.8 g bullet is fired horizontally into (but does not go through) it. After the impact, the block-bullet combination slides 6.50 m before coming to rest. If the coefficient of kinetic friction between block and surface is 0.750, determine the speed of the bullet immediately before impact.
(No Response) m/s

1. If by mistake, chemist used 100% ethanol rather than THF as a solvent, would the synthesis proceed as expected? Why or why not?

2. Why is bromotoluene added dropwise to the reaction flask rather than all at once?

3. Draw a dipole moment (see chapter 1) to explain the polarity of the following Grignard reagent?

MgBr

1. In this reaction we will be heating butadiene sulfone to perform a Diels-Alder reaction. What side product is generated upon heating butadiene sulfone and how will we trap this side product?

2. In most chemical reactions it is a bad idea to create a closed system, that is a system which cannot attenuate to pressure changes. In this reaction what measures are taken to avoid a closed system and why would it be a particularly bad idea to create a closed system for this Diels-Alder reaction?

Explain the physiological principles behind the recommendations for daily carbohydrate intake for athletes in training and the intake of specific kinds and amounts of carbohydrate -containing foods before, during and after excercise

Customers are arriving to a shop according to Poisson process with mean 3.2 customers/hour. What is the probability that the next customer will arrive after 10 minutes but before 33 minutes?

You have just interviewed a prospective employee for the personnel department.
Outline the main steps you should have taken before, during and after the
interview. for 20 marks

What is the meaning of ‘apocalypse’ and ‘eschaton’? Why were such writing popular in the time before, during and after Jesus? Why would Jesus be considered a first century apocalyptic prophet?