hanitb2009

Let f(x,y)=2x+y−3f(x,y)=2x+y−3 be defined on  Ω:−1≤x≤2,0≤y≤2Ω:−1≤x≤2,0≤y≤2. Let P1={−1,0,2}P1={−1,0,2} be a partition of  [-1, 2] and let P2={0,2}P2={0,2} be a partition of [0, 2]. Let P=P1×P2P=P1×P2. Then Lf(P)Lf(P) is

(1 point) In the study of red/green color blindness, 750 men and 2750 women are randomly selected and tested. Among the men, 64 have red/green color blindness. Among the women, 6 have red/green color blindness. Test the claim that men have a higher rate of red/green color blindness.

(a) State the null hypothesis:

(b) State the alternative hypothesis:

(c) The test statistic is

(d) Is there sufficient evidence to support the claim that men have a higher rate of red/green color blindness than women? Use a 1% significance level.

A. Yes

B. No

(e) Construct the 99% confidence interval for the difference between the color blindness rates of men and women.

(1 point) Suppose a group of 900 smokers (who all wanted to give up smoking) were randomly assigned to receive an antidepressant drug or a placebo for 6 weeks. Of the 513 patients who received the antidepressant drug, 110 were not smoking one year later. Of the 387 patients who received the placebo, 101 were not smoking one year later. Given the null :   and the alternative hypothesis: ≠ 0 , conduct to see if taking an antidepressant drug can help smokers stop smoking. Use,  α= 0.05

(a) The test statistic is

(b) The P-value is

(c) The final conclusion is

    ◯ A. There seems to be evidence that the patients taking the antidepressant drug have a different success rate of not smoking after one year than the placebo group

    ◯ B. There is not sufficient evidence to determine whether the antidepressant drug has an effect on changing smoking habits after one year.

 Let  . Determine the derivative  at the point  .

So now that weekly race has been done with, any idea when weekly contributions will be rewarded ? I don't see anything related to last week's results or sort on my profile at all.

Find  by implicit differentiation when :

 Let  . Determine the derivative  at the point  .

Let f(x,y)=2x+y−3f(x,y)=2x+y−3 be defined on  Ω:−1≤x≤2,0≤y≤2Ω:−1≤x≤2,0≤y≤2. Let P1={−1,0,2}P1={−1,0,2} be a partition of  [-1, 2] and let P2={0,2}P2={0,2} be a partition of [0, 2]. Let P=P1×P2P=P1×P2. Then Lf(P)Lf(P) 

Using Appendix D, calculate the molar solubility of zinc hydroxide in pure water.

Arrange the following in order of increasing radius and increasing ionization energy.

1. N⁺, N, N⁻
2. Se, Se⁻, Cl, Cl⁺  
3. Br⁻,  Rb⁺ , Sr²⁺

Arrange the following ionisation potential order of N3-, N2-, N-, N ,N+

Explain why monosaccharide show high solubility in water and low solubility in organic solvent

 10 ml of commercial vinegar solution was added to 100ml volumetric flask distilled water was added till the line mark. 5 ml of the dilute vinegar was titrated against standardized NaOH solution of molar concentration 0.25M. The end point was reached after the addition of 3.32 ml NaOH solution. The concentration of acetic acid in commercial vinegar solution is:

If 1,210.5 g of copper (II) chloride (CuCl₂) reacts with 510.0 g aluminum metal (Al) to produce 525.0 g copper metal (Cu), what is the limiting reactant?

30.0 g of an aluminum mineral is reacted with enough HCl to produce the corresponding chloride and 5,548 L of hydrogen gas (coming exclusively from the reaction of aluminum). If the reaction was carried out at 30 ° C and at a pressure of 1.12 atm.

Calculate the % composition of the aluminum in the mineral sample.

A month repellent,para-dichlorobenzene ,has the composition 49.1%C,2.7%H and 48.2% Cl. its molecular mass is 147 amu. what is molecular formula?

Ethyl acetate has a vapor pressure of 118.3 mmHg at 29.5 degrees C and a normal boiling point of 77.0 degrees C. Estimate the vapor pressure at 45 degrees C using Antione equation

What is benzene 

A welder’s acetylene tank has a volume of 84.9L.  It is stored at a temperature of 20.79 °C and has a pressure of 7274. kPa.  How many moles of acetylene are in the tank?

I am not getting it

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If 5.40 g of reacts with excess oxygen and produces 0.350 L of  at 299 K and 1 atm, what is the percentage yield of the reaction?

%

A piece of metal has a density of 7.5 and a volume of 39.6 . What is its mass in grams?

QUESTION 8

If 75mL of a 2.6M solution is diluted to a final concentration of 0.9M, what is the final volume of the solution?

A gas sample contains 4.0 g of CH₄ and 2.0 g of He. What is the volume of the sample at STP?

A gas cylinder A has a volume of 48.2 L and contains N2 (g) at 8.35 atm and 25 ° C. Gas cylinder B, the volume of which is unknown, contains He (g) at 9.50 atm and 25 ° C. When the two cylinders are connected and the gases are mixed, the pressure in both cylinders is 8.71 atm.

What is the volume, in liters, of bottle B?

The pH of a solution is 6.

What is the pOH? pOH = 

What is the hydrogen concentration? [H+] =    M

 A 0.2121 g sample of an organic compound was burned in a stream of oxygen, and 
the CO2 produced was collected in a solution of barium hydroxide. 
Calculate the percentage of carbon in the sample if 0.6006 g of BaCO3 was formed.

In order to verify the heat of reaction, a chemist mix is 1 L of one more NAOHM1 liter of one more HCl the initial temperature of the two solutions is 25°C specific heat of water is 4.184 J Program Celsius the enthalpy of reaction of the following is -58 kJ per mole considering on with the specific heat of the 2 L of water and no heat transfer to or from the surroundings. What is the final temperature of the solution?

 

Substance	Enthalpy of Formation (kJ/mol), 298 K
Oxygen ()(g)	0
Methane ()(g)	-74.8
Carbon Dioxide ( )(g)	-393.5
Water ()(g)	-241.8
Water ()(l)	-285.8

1. A student analysed several tablets of one brand of iron supplement for its iron content using atomic absorption spectroscopy. Following are the set of data obtained. 192 mg, 216 mg, 202 mg, 195 mg and 204 mg. Should the value 216 be rejected?

Silver arsenate is slightly soluble in water. What happens to it? Does polarity, size, ionic bonding affect it?

What product would you expect from SN2 reaction of 1-bromobutane with NaI?

How many moles of NaCl are present in 25.00mL of 1.85M NaCl(aq)?

The conformation of the following butane molecule is rather high in energy. What type of conformation is butane in currently?

The cylinder-piston device holds 0.2 m of air at a pressure of 200 kPa, at which condition a linear spring touches the piston.  But without force acting on the piston as shown in the following figure, the air is heated until the volume and pressure change to 0.5 m and 800 kPa, respectively. Find (a) the total work performed by the air; (b) the work performed against the spring.  (c) Draw a Pu diagram showing the process. (Answer (a) 150 KJ (b) 90 kJ).

If it takes 72 mL of 9 M KOH to neutralize 415 mL of sulfuric acid (H2SO4) solution, what is the concentration of the H2SO4 solution?

Element A has two isotopes. The first isotope is present 13.00% of the time and has a mass of 240.39. The second isotope has a mass of 189.67. Calculate the atomic mass of element A.

⭕ 5,590.8

⭕ 233.8

⭕ 16,532.54

⭕ 196.3

⭕ The atomic mass cannot be calculated without more information.

What is the shape of ?

⭕ trigonal pyramidal

⭕ tetrahedral

⭕ trigonal planar

⭕ bent

⭕ linear

What is the angle of ?

Assume that you are working with an Antacid tablet that contains 550mg CaCO₃ and 110mg Mg(OH)₂. Each tablet weighs 745mg.

Part A step 1. Determine the amount of tablet powder that would need to be weighed to give you 1000mg of CaCO₃.

Part A Step 3. How much CaCO₃ is in the 20 ml portion?

Part A Step 4. How much EDTA is needed for one titration? Given that each mL of EDTA is equivalent to 5.004 mg of CaCO₃.

If the tablets (tablet powder) actually contain both CaCO₃ and Mg(OH)₂ – How much Mg(OH)₂ was weighed in Part A Step 1 along with the CaCO₃.

Part B Step1: In each ml of filtrate, how much (mg) of each, CaCO₃ and Mg(OH)₂, exist?

So how much filtrate would be equal to 120mg of CaCO3 and Mg(OH)₂?

Part B Step 3: How much EDTA is needed for one titration? (Remember for the Ca present: each mL of EDTA is equivalent to 5.004 mg of CaCO₃ and for the Mg present: each mL of EDTA is equivalent to 2.916 mg of Mg(OH)₂.)

If stomach acid, given as 0.1 M HCl, reacts completely with an antacid tablet containing 500mg of CaCO3, what volume of acid in millilitres will be consumed? The balanced equation is:
CaCO3(s) + 2HCl(aq)  CaCl2(aq) + CO2(g) + H2O