Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 49

**Chemistry**

Prior to their phaseout in the 1980s, chemicals containing lead were commonly added to gasoline as anti-knocking agents. A 3.279 g sample of one such additive containing only lead, carbon, and hydrogen was burned in an oxygen rich environment. The products of the combustion we...

**Inverse Trig**

Using -pi/2 ≤ y ≤ pi/2, what are the following solutions? y=arcsin root3/2 y=arcsin 1/2

**Inverse Trig**

What is the general solution to y = arcsin 0?

**Inverse Trig**

How do I simplify arcsin (sin 6 pi) given the interval 0 ≤ theta < 2pi

**Inverse Trig**

What is the general solution to y = arcsin 1?

**Chemistry**

2) What is the empirical formula of a compound containing C, H, O if combustion of 1.23g of the compound yields 1.8g CO2 and .74g of H2O 3) What are the empirical and molecular formulas of a hydrocarbon if combustion of 2.10g of the compound yields 6.59g CO2 and 2.7g H20 and i...

**Chemistry**

Determine the mass of the products formed by the combustion of a 7.6g of a coumpound with emprical formula C7H12

**Chemistry**

but on 4 the spin is Ms= -1/2

**Chemistry**

The principal quantum number, n, describes the energy level of a particular orbital as a function of the distance from the center of the nucleus. Additional quantum numbers exist to quantify the other characteristics of the electron. The angular momentum quantum number (ℓ...

**Chemistry**

A. is wrong that is not one of the answers. I have calculated 1.5912 X 10^-28 but the only near answer is 1.591 x 10^-19

**Chemistry**

1) Calculate the energy. in joules, of a photon of wavelength 1.250x 10^3 nm 2) If 3.011x 10^23 molecules have a mass of 20.04 grams, what is the molar mass of the substance? Is it 40.07g/mol? 3) 47.5g of Boron contains __________ atoms of B? Is it 2.65x10^24 4) What is the wa...

**social studies(check answers)**

please check my answers and if there wrong maybe you could tell me the correct one.but thanks anyways. 1. How did the formation of the National Action Party change Mexican politics? A.It ended the one-party system. B.It consolidated power among a few key leaders. C.It ended th...

**social studies (CHECK ANSWERS)**

1. How did the formation of the National Action Party change Mexican politics? A.It ended the one-party system. B.It consolidated power among a few key leaders.(I PICK THIS) C.It ended the revolution. D.It lessened the power of the president. 2. It is hard for children in rura...

**math(CHECK ANSWERS)**

please check my answers. Mrs. Walters drove 160 miles on 5 gallons of gas. How many gallons of gas will she need to travel 256 miles? (ANSWER):160 divided by 5=32 256 divided by 32=8 Stephen read 90 pages in 6 days. If he continues reading at that rate, how long will it take h...

**math(help)**

can anyone answer these 3 answers showing how your work.thanks Mrs. Walters drove 160 miles on 5 gallons of gas. How many gallons of gas will she need to travel 256 miles? Stephen read 90 pages in 6 days. If he continues reading at that rate, how long will it take him to read ...

**science(1answer)**

4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the trai...

**science (check answers)**

4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the trai...

**science(check answers)**

2.how would the kinetic energy of a 12,000-kg train compare with the kinectic energy of a 900-kg compact car if both were traveling at the same speed? A.the trains kinectic energy would be equal to the cars kinectic energy. B.the trains kinectic energy would be greater than th...

**science(check answers)**

i pickerd A.

**science(check answers)**

1. A 60-kg cheetah reaches a speed of 30 m/s as it chases its prey.What is the kinetic energy of the cheetah? A.900 j B. 1,800 j C.27,000 j D. 54,000 j

**math(CHECK ASNWERS)**

PLEASE CHECK MY ANWERS THANKS 1.The length of the driveway shown on a blueprint is 2 inches. If the actual length of the driveway is 20 feet, what is the scale of the blueprint? 1 in. = 1 ft 1 in. = 2 ft 1 in. = 10 ft (I PICK THIS) 1 in. = 40 ft 2.Marcus built a model car that...

**math**

hey everyone can you guys please answer these 5 questions or 3 or 2 how many you want to answer I just need answers for these last 5 since I did the rest and thanks to you all because I do appreciate this. 1.The length of the driveway shown on a blueprint is 2 inches. If the a...

**MATH !!!**

PLEASE ANSWER THESE 3 I BEEN STUCK ON ALL DAY AND IM SICK OF THEM JUST WANNA SLEEP..PLEASE LABEL ANSWER WITH A B C D ! 1.which pair of ratio form a proportion? choose all that apply. A. 1/6, 4/20 B. 7/9, 28/36 C. 14/18, 21/27 D. 30/80, 8/18 2.which pair of ratios does not form...

**math**

can someone answer these ive been stuck on them for almost 2 hours !!!!! 1.which pair of ratio form a proportion? choose all that apply. A. 1/6, 4/20 B. 7/9, 28/36 C. 14/18, 21/27 D. 30/80, 8/18 2.which pair of ratios does not form a proportion? A. 3/5, 24/40 B. 30/10, 15/3 C....

**soical studies**

goodjob matt

**soical studies**

yay !!

**Redland ES**

6 children share 5 small pizzas equally? How do I solve this?

**Algebra 2**

A lamppost casts a shadow that is 24 feet long. Tad, who is 6 feet tall, is standing directly next to the lamppost. his shadow is 15 feet long. How tall is the lamppost?

**can some1 plz recheck my answers**

n n

**maths**

v h vhv g g

**Science**

Each student is pulling with a force of 10 newtons

**chemistry**

So I would assume that the answer would be (-393.5)-(0)= -393.5 However, the problem lists the compound heat of formation for water also, which makes me think I have the wrong balanced equation up top, but at the same time no type of coal is specified, so there is no way to kn...

**chemistry**

From the following information, calculate the standard change of enthalpy for the combustion of coal. C + O2 -> CO2 COMPOUND HEAT OF FORMATION coal 0.0 carbon dioxide -393.5 water (l) -285.9 oxygen 0.0

**Physics**

When I follow your steps I get 1284 cm/s, so I'm not sure how you're getting 2.08 m/s. What gravitational potential energy term are you referring to?

**Physics**

A 100-g block hangs from a spring with k = 5.2 N/m. At t = 0 s, the block is 20.0 cm below the equilibrium position and moving upward with a speed of 216 cm/s. What is the block's speed when the displacement from equilibrium is 27.0 cm? The answer is 172 cm/s; but I cannot...

**Physics**

How did you go from -(104+64)g*1 + 64gL to L=168/64? When I sum the forces of -(104+64)g*1 + 64gL, I get 3060.72.

**Physics**

A wooden plank with length L = 7.5 m and mass M = 104 kg is centered on a granite cube with side S = 2.0 m. A person of mass m = 64 kg begins walking from the center of the plank outward, as shown in the figure. How far from the center of the plank does the person get before t...

**chemistry**

50.00 mL of OOH was diluted to 250.0 mL with deionized water. In the determination of the total cation concentration, 25.00 mL aliquots of the dilute OOH were passed through a cation exchange column and the eluent titrated with an average 27.42 mL of 0.1134 M NaOH. In the dete...

**Science**

Which of the following describes the function of the central vacuole in plant cells? a. It helps reproduction b. It helps regulate water content c. It plays key role in photosynthesis d. It stores food. I think it's D. Am I wrong? 2) What are the similarities of Monocots a...

**Chemistry- please help ASAP!!!! thank you**

S(rhombic)+O2(g)--->SO2(g) change in H(rxn)= -296.06 kJ/mol S(monoclinic)+O2(g)--->SO2(g) change in H(rxn)= -296.36 kJ/mol 1. Calculate the enthalpy change for the transformation. S(rhombic)-->S(monoclinic) Our goal is to calculate the enthalpy change for the formatio...

**chemistry (quatatative analysis)**

How many grams of Ba(IO3)2 can be dissolved in 500 mL of a 0.100 M KIO3 solution at 25 oC? Use activities for this calculation. The solubility product constant for Ba(IO3)2 is 1.57×10-9 at 25 oC.

**ENGLISH**

I've been given this question for the novel THE GREAT GATSBY and have been stuck on how to answer it for hours. "Boy meets girl...boy loses girl" this novel is merely another love story. to what extentdo you share this opinion of the novel? Im not sure how to str...

**making dot arrays**

to make a 14-dot array that has exactly two rows, is this going to have a total of 14 dots or will it be 14 dots per row

**Spanish 2**

Sorry didnt realize I didn't put my answers. Aburran encante fascine interesen molesten Reasoning- to for an Ud. or Uds. command drop the o of the present tense yo form and add e and en for ar verbs and a and an for er and ir verbs

**Spanish 2**

Complete the sentences with the appropriate indirect object pronouns and present tense verb forms.? Modelo- (gustar) A mi ME GUSTAN las peliculas de accion. 1. (aburrir) A nosotros _____ los efectos especiales que no son muy realistas. 2. (encantar) A ti ____ las peliculas de ...

**statistics**

a sample of n=25 scores has a mean of M=60 and a std dev of s=12. Find the z-score corresponding to each of the following scores from this sample. X=66,X=48,X=84,X=55

**algebra**

Help with these please?! Simplify the complex expression: -3 --- 5 - + y x and 2 -- + 2 x+4 ---------- 3 -- + 1 x+4 I cannot decipher what you meant to type. Try using parentheses instead of changing to a new line for fractions. -3/[(5/x)+y] (2/x+4)+2 over [3/(x+4)]+1

**biochemistry**

What chemical transformations are catalzyed by the enzyme i) catalase and ii) nitrogenase ???? confused, please help! In nitrogen-fixing microorganisms, nitrogenase catalyzes the conversion of nitrogen to ammonia. Catalase accelerates the breakdown of H2O2 into H2O and O2, in ...

**Biochemistry**

What properties of the enzymes give rise to their ability to distinguish one substrate from another??? And where can I find information on this? http://en.wikipedia.org/wiki/Enzyme Scroll to Specificity then read from there to Allosteric modulation

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