SltLfe92

I am so lost as to trying to understand this process..Any help will be most appreciated

So I just did a recrystallization lab and calculated my percent recovery ( Pure=0.618g, Impure=1.188g) which was at 52 %...What does percent recovery specifically let you know about your compound?

Predict which acid is stronger and explain why.

(CH3)2=O(+)H or (CH3)2CH-O(+)H2

Please help me to understand this. I know you have to look at the element effect, resonance, induction, and hybridization. I am stuck on where to begin. I really want to understand this conceptually.

Part A

0.35g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution?

Part B

0.10g of sodium hydroxide (NaOH) pellets are dissolved in water to make 7.5L of solution. What is the pH of this solution?

A beaker with 195mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.20mL of a 0.440M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.760.

Part A:

Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction

2COF2(g)⇌CO2(g)+CF4(g), Kc=5.30

If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium?

Part B:

Consider the reaction

CO(g)+NH3(g)⇌HCONH2(g), Kc=0.880

If a reaction vessel initially contains only CO and NH3 at concentrations of 1.00 M and 2.00 M, respectively, what will the concentration of HCONH2 be at equilibrium?

Please help im a little stuck on these two problems

Based on a Kc value of 0.260 and the given data table, what are the equilibrium concentrations of XY, X, and Y, respectively?

http://session.masteringchemistry.com/render?tex=\...

Part A

0.35g of hydrogen chloride (HCl) is dissolved in water to make 6.5L of solution. What is the pH of the resulting hydrochloric acid solution?

Part B

0.10g of sodium hydroxide (NaOH) pellets are dissolved in water to make 7.5L of solution. What is the pH of this solution?

A mixture initially contains A, B, and C in the following concentrations: [A] = 0.500M , [B] = 0.950M , and [C] = 0.650M . The following reaction occurs and equilibrium is established:

A+2B⇌C

At equilibrium, [A] = 0.300M and [C] = 0.850M . Calculate the value of the equilibrium constant, Kc

The half-life of a reaction, t1/2, is the time required for one-half of a reactant to be consumed. It is the time during which the amount of reactant or its concentration decreases to one-half of its initial value.

Determine the half-life for the reaction in Part B using the integrated rate law, given that the initial concentration is 1.65mol⋅L−1 and the rate constant is 0.0017mol⋅L−1⋅s−1 .

Part B =rate of reaction =

1.7×10−3 mol⋅L−1⋅s−1

Part A)

A certain reaction has an activation energy of 70.0kJ/mol and a frequency factor of A1 = 7.30×1012M−1s−1 . What is the rate constant, k, of this reaction at 20.0∘C ?

Part B)

The Arrhenius equation can be rearranged to a form that resembles the equation for a straight line:

lnky==−(EaR)m(1T)x++lnAb

where y is lnk, m is the slope or −EaR, x is 1T, and b is the y-intercept or lnA. The linearity of this equation is illustrated graphically in the image

An unknown reaction was observed, and the following data were collected:

T k

(K) (M−1⋅s−1)

352 109

426 185

Determine the activation energy for this reaction.

Consider the reaction

A+2B⇌C

whose rate at 25 ∘C was measured using three different sets of initial concentrations as listed in the following table:

Trial [A](M) [B](M) Rate(M/s)

1 0.35 0.050 7.4×10−3

2 0.35 0.100 1.5×10−2

3 0.70 0.050 2.9×10−2

Calculate the initial rate for the formation of C at 25 ∘C, if [A]=0.50M and [B]=0.075M.

The rate constant for a certain reaction is k = 1.10×10−3s−1 . If the initial reactant concentration was 0.350 M, what will the concentration be after 15.0 minutes?

How much electric potential energy does an electron have when placed 5.3E -11 m from a proton? Express answers in Joules and in " eV"

Im having a hard time just knowing where to start. I know im solving for potential electric energy, but do I use the equation u=qV...Im so lost on how to solve this problem...Any help is greatly appreciated!

A CD-ROM drive in a computer spins the 12-cm-diameter disks at 8800rpm .

What is the acceleration in units of g that this speck of dust experiences?

A toy train is pushed forward and released at Xi = 1.5m with a speed of 1.5 m/s . It rolls at a steady speed for 1.4s , then one wheel begins to stick. The train comes to a stop 4.6m from the point at which it was released.

What is the train's acceleration after its wheel begins to stick?

Please help..I want to understand how to go about this problem. Physics is not my strong point