L.O.R.Y

So I calculated a critical point of (0,0) but my second derivative test was equal to 0.....hence it should be inconclusive but obviously when you plot this function, you get a global min...what have I done wrong??

At what points on the curve (y^2 − 2y − x)(y^2 − 2y + x + 2) = 1 does dy/dx not exist?

How do I solve this?

I did implicit differention but then Im not sure how to identify dy/dx that do not exist? Do I use limits?

Thanks

I'm doing a project to observe the behaviour and movement of a particular fish....we can see periodicity in our data but with a lot of variability....is it good to use chaos theory to achieve a mathematical model for this....

Hi guys I'm new to python and I was wondering how do you get python to read data from excel and generate graphs from it. Actually I need it to generate multiple seperate graphs all at the same time.

My data sort of like this

Name Time Velocity

Caren 3.5 10

Kasey 3.5 8

Abbey 3.5 7

So i basically want python to generate seperate time and velocity graphs for each of the girls

How do I do that?? The data I'm trying to analyse is complicated than this...but I just need a general hint and suitable websites that could direct me to it

What does Neuron's polarity exactly mean biologically??? I know that neuronal precursor cells become polarised when they start to form dendrites and axons but what exactly does that mean....how does it become polarised

Can someone explain to me what neurite outgrowths mean?

Can someone explain to me what a presynaptic locus is??

1.) 3.0 g of NaOH was added to a 3.0 L of a 0.5 M HCl solution. What is the resulting [OH-]?

2.)

1.0×10-3 micromoles of HCl was added to 1.0 L of water. What is the resulting pH?

3.) The sodium salt of an acid’s conjugate base, NaA, was added to 1.5 L of water. The Ka of HA is

4.3×10-3. If the resulting pH of the solution was 8.3, how much NaA was added?

1.) Consider a pressure – temperature phase diagram with the triple point at a pressure of

pt and a temperature of Tt. If a system is on the phase boundary between solid and

liquid phases, which of the following statements is always true for the system?

(A) ΔG = 0, pressure > pt

(B) ΔG ≠ 0, temperature > Tt

(C) ΔG = 0, pressure < pt

(D) ΔG = 0, temperature < Tt

(E) ΔG ≠ 0, pressure > pt

I really have no clue about this question apparently the answer is A

2.)PbCl2 has a Ksp of 1.6×10-5. If 500 mL of X M HCl must be added to 500 mL of 0.035

M Pb(NO3)2 before a precipitate is observed, what is the value for X?

For this one I calculated how many moles of Pb+ and Cl- I had and I got 0.0175 moles for Pb and 0.5n for Cl and the concentration is just the same and so I solved for this

1.6 x 10^-5 = [Pb] [2 x Cl-]

but I'm getting the wrong answer which is X>or = to 0.06..

help pls

What is the pH in the titration of 47 mL of 0.1 M HCl with 0.1 M NaOH after the addition of 47 mL 0.1 M NaOH?

Is the answer just 0????..or 1....or is something wrong with this question

cause there are no excess H+??? =0

Given the following mechanism, which species below may be classified as intermediates in the formation of XO2 from X and O2?

I think that its YO...its that right?

X + YO2 → XO + YO

XO + YO → XO2 + YO

YO + O2→ YO + O

YO + O → YO2

A.

X only

B.

YO only

C.

both XO and YO

D.

both YO2 and O2

E.

both X and YO2

If I let 100 ml of 0.1 M acetic acid react with magnesium inside a flask and 100 ml of 0.1 M HCl react with magnesium in a different flask....which one will produce the most hydrogen gas? Or do I need pka of acetic acid to figure this out?

The concentration of bromate ion, BrO3- can be determined by titration with I- ion, where the endpoint can be detected by adding a small amount of starch. The reaction occurs by the following unbalanced equation:

BrO3- + H+ + I- → Br- + I3- + H2O

How many mL of 0.6114 M aq. KI solution will be required to react with 60 ml of 0.6015 M aq. NaBrO3 solution?

Do I just use C1V1=C2V2????

Lithium metal reacts with molecular fluorine gas to form lithium fluoride. A closed container of volume 9.00 x 103 mL contains fluorine gas at 7.72°C and 11.7 x 105 Pa. Then 32.2 g of solid lithium is introduced, and the reaction goes to completion. What is the final pressure (in Pa) if the temperature rises to 81.42°C?

do I just use P1V1=P2V2??

Lead is oxidised in air to produce lead oxide(IV). The reaction of lead follows the thermochemical equation

Pb(s) + O2(g) → PbO2(s) ΔrH° = -277.4 kJ mol-1

How much heat (in kilojoules) is liberated by the combustion of 6.16 g of lead?

is the answer just 277.4kJ? because deltaH = -q

The combustion of 0.43 g of a compound that consists only of carbon and hydrogen atoms results in 672 mL CO2 (g) and 0.63 g H2O (standard conditions). When the reaction is initiated the 0.43 g of the unknown compound forms a gas with a volume 156 mL at 50 ºC and a pressure of 861 mbar (check literature to find the definition of the pressure unit bar). Using the information above make a prediction about the composition of the unknown compound.

1.)For a hypothetical reaction, Kp at 300K equals 257.5. If a 2L flask is used, and initial moles of reactant was 7, calculate the equilibrium concentration of Z.

Y ⇌ 2Z

2.)

What do you get if you mix acetic acid and copper sulphate?

What happens if you then mix the products of that reaction with sodium hydroxide?

Sammy is walking through the jungle and comes across a creek that is quite wide. To get across, Sammy decides to use a nearby vine as a swing. Holding onto the vine, he launches off the bank towards the other side of the creek.

(a) If the vine is 3 m long, how much time will it take Sammy to swing to the other side of the creek?

(b) If the vine has a breaking stress of 4:9  106 Nm^2 and a cross-section of 12 cm2 , and Sammy has a mass of 65 kg, will Sammy make it across the creek without breaking the vine?

(c) Say the vine did break and Sammy fell into the creek with a loud splash. Elise is standing 1.5 km away from the creek, how much time will the sound of the splash take to reach Elise? Assume that the speed of sound in air is340 ms^-1

.

Given the following two reactions at 298 K and 1 atm pressure, which of the statements below is CORRECT?

N2(g) + O2(g) → 2NO(g) ΔH1

NO(g) + ½ O2(g) → NO2(g) ΔH2

(A) ΔHºf for NO(g) = ΔH1

(B) ΔHºf for NO2(g) = ΔH2

(C) ΔHºf for NO2(g) = ΔH2 + ½ ΔH1

(D) ΔHºf for NO2(g) = ΔH2 - ½ ΔH1

(E) ΔHºf for NO2(g) = ΔH2 + ΔH1

The answer is C...not sure why

My lecture notes say

that

Network solids> metallic solids> ionic solids

is that right? shouldnt ionic solids be stronger than metallic solids

or ionic bonds stronger than metallic bonds?

Also when I form bonds why do I always absorb energy