1. chemistry HELP!

Solve an equilibrium problem (using an ICE table) to calculate the pH of each solution: a solution that is 0.170 M in HC2H3O2 and 0.105 M in KC2H3O2

2. chemistry

How many moles of water, H2O, are present in 75.0 g H2O?

3. physics

20 kg , 30 cm diameter disk is spinning at 300 rpm. How much friction force must be applied to rim to bring the disk to a halt in 3.0s?

4. physics

2. A heavy box is pulled across a wooden floor with a rope. The rope forms an angle of 60.0°with the floor. A tension of 80.0° N maintained on the rope. What are the horizontal and vertical components of the force?

5. chem

Consider the following unbalanced equation: C2H5OH(g) + O2(g) → CO2(g) + H2O(l) 1.55 g of ethanol reacts with 10.0 g of oxygen. What is the total volume of gas present (in L) after the reaction is complete, assuming the reaction takes place at 1.00 atm

6. Chemistry

The gaseous product of a reaction is collected in a 25.0-L container at 27 C. The pressure in the container is 216 kPa, and the gas has a mass of 96.0 g. What is the molar mass of the gas?

7. Chemistry

a chemist needs to order Na2B4O7. One supplier offers it in an anhydrous (without water) form, while another offers it as a hydrated crystal, Na2B4O7*10H20. if the prices from the two suppliers are the same for a 500.0-g bottle, which one would supply more

8. Chemistry

What is the percent by mass of glucose in a solution containing 0.15 moles of glucose dissolved in 410g acetic acid? The molar mass of glucose is 180g/mol

9. Chemistry

Copper sulfate is a hydrated crystal with the formula CuSO4*5H20 and a deep blue color. when its heated, the crystals crumble and turn white. (a) propose an explanation for this change of color. (b) what would you do to restore the blue color?

10. Physics

How long would it take a kettle with a 1kW heating element to heat 1 litre of water? Watts = Joules / second • Mass of 1 litre of water = 1kg • 1 kW = 1 k Joule / second or 1000 joules/ second • 1g of water needs 4.184J to raise the temperature by

11. Chemistry

For the reaction: 2H+(aq) + CO3-2(aq) --> CO2(g) + H2O(l) A. Calculate the deltaHºrxn for the reaction. Given deltaHºf for CO3-2(aq) = -677.1 kJ/mol. B. Using the above reaction, what would be the final temperature of a coffee cup calorimeter when 0.104

12. Chemistry (URGENT)

A gas mixture with a total pressure of 770 contains each of the following gases at the indicated partial pressures: CO2 , 249mmHg ; , Ar 114mmHg ; and , O2 174mmHg . The mixture also contains helium gas. 1. What is the partial pressure of the helium gas?

13. geometry

Write the converse, inverse, and contrapositive of the conditional statement. If an animal is a bird, then it has two eyes.

14. chem

15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.22 M lead(II) nitrate solution. What is the concentration of phosphate ions left in solution after the reaction is complete? A) 0.0 M B) 0.045 M C) 0.13 M D) 0.060 M E) 0.12 M

15. English

Seven brothers' families grew to more than one thousand people in 100 years. Does families need an apostrophe? The mens group made t-shirts for the children. would mens be 's or s' ?

16. physics

A friend throws a baseball horizontally. He releases it at a height of 2.0 m and it lands 21 m from his front foot, which is directly below the point at which he released the baseball. (a) How long was it in the air? (b) How fast did he throw it?

109. Chemistry

Determine how many milliliters of 0.448 M HClO4 will be required to neutralize 38.30 g Ca(OH)2 according to the reaction: 2HCl+Ca(ClO4)2+2H20

110. BK

If the incline is 25 degrees and a box that is resting on the frictionless incline 50 kg, what is the box acceleration

111. chemistry

a buffer is made by mixing 0.1 moles of acetic acd a sodium acetate in 500 ml of solution. determine the pH of the buffer. (Ka for acetic acid - 1.8E-5)

112. english

I need help really quick unscrambling this word!!! AAAATTTLIIRRONNME Its two words and its the name of a mall. the first words starts with I and the second starts with M.

113. other

A cannon mounted on a pirate ship fires a cannonball at 125 m/s horizontally, at a height of 17.5 m above the ocean surface. Ignore air resistance. (a) How much time elapses until it splashes into the water? (b) How far from the ship does it land?

114. physics

A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2. (a) How long does it take for the box to reach the moon's surface?

115. geometry

Triangle ABC is an isosceles triangle, where angle B is the vertex angle. If BC = 10x-4 , AC= 2x+18 , and AB= 6x+32, find the value of x.

116. English

What are some main points of rising action in the Scarlet Ibis?

117. Creative Writing

I need helps with finding the mood for this: Your school needs more money for basic supplies. I kind of have to "beef" that sentence up to show the mood better, but I don't know how to do that. HELP?!?!

118. math

If O is 31 degrees and T is 121 degrees then what is the measure of angle A?

119. math

two runners jog around an oval path at constant rates, but in opposite directions. One runner completes a lap every 10 minutes, and the other does a lap every 12 minutes. How many minutes elapse between consecutive meetings of the runners?Express your

120. science

Why is the acceleration the same between a tennis ball and a cannon ball?

121. Finance

What problems may be indicated by an average collection period that is substantially above or below the industry average?

122. math

My study group is lost on this one also.. Suppose you are managing 25 employees, and you need to form three teams to work on three different projects. Assume that all employees will work on exactly one team. Also, each employee has the same

123. college maths

One and one-half cups of native blueberries have 232 calories. How many calories does one cup of native blueberries have? (Points: 5) 233.5 calories per cup 232 calories per cup 154.7 calories per cup 0.006 Calories per cup Not sre how to calclate this one

124. French

Please check if this is right: Demain matin, je vais aller à la ferme. Je n’ai jamais visité une ferme avant. D’abord, je vais faire une randonnée à pied. Ensuite, je vais voir: un cochon, un lapin, un cheval, une vache, un ècureuil, et un oiseau,

125. Language arts

Figurative language

126. Chemistry (URGENT)

Calculate the molarity of the Co^2+ ion in each of the solutions 1-5. The new molarity is given by the molarity of the stock solution multiplied by the dilution factor. Solution: Co(NO3)2 Original molarity: 0.160 Dilution #1: none D#2: 12mL to 16mL D#3:

127. English

1. Keep your fingers crossed. (Why do you use this expression? When we wish somebody good luck, we keep our fingers crossed. Why do we do that? Do you have some reason for that?)

128. Chemistry

Can the 5% approximation be used to determine the pH of the following solutions? How do I do this question? (A) 0.56 M hypochlorous acid - yes (B) 3.00 M nitrous acid - yes (C) 0.010 formic acid - no

129. Help pls

A box is dropped from a spacecraft moving horizontally at 27.0 m/s at a distance of 155 m above the surface of a moon. The rate of freefall acceleration on this airless moon is 2.79 m/s2. (a) How long does it take for the box to reach the moon's surface?

130. math

Six people are going to be seted in a row of 8 chairs. How many different ways may they be seated?

131. Chemistry

A 10.0 mL sample of 12.1 M hydrochloric acid is added to 90.0 mL of distilled water and added to a sealed 1.04 L reaction vessel containing 1.463 g of calcium hydrogencarbonate at 22.1ºC and 743 mmHg. What is the pressure of carbon dioxide gas?

132. Aims math [help please very appreciated]

Solve fro x. 15x+4=21+2x

133. math

A woman throws a cricket ball upwards into the air. The ball leaves the womans hand at 1.8m above the ground at speed of 9.7. It rises and then falls back to the ground. Considering the energies involved calculate the speed at the point it hits the ground.

134. chemistry

I am doing a boiling point problem and don't know the value of i for the equation delta T = i(kb)(m) solution contains 45.0g caffeine in 25.0 g benzene.

135. calculus

what is the equation of the tangent line to the curve x^3 + 2y^2 + 3xy = 6 at the point (1,1)?

136. chemistry

the molar solubility of PbS, in a 0.150 M ammonium sulfide (NH4)2S solution is? The Ksp for PbS= 3.2E-28.

137. grammar

How does one diagram " He helps build the house" "helps" is not a helping verb, but "build" is not an infinitive, or is it?

138. english

around how many percent of people think they don't need college degree to find a job

139. Science

Where on a rollercoaster is potential energy the greatest? The least? Please help me, this is due tomorrow. I have a bunch of other questions along with this. I am such a procrasinator. >.< Thank you! -Pancake

asked by The Official Pancake Queen
140. Life Sciene

How would the cell theory be affected if scientists could make living cells from carbon, oxygen, and other elements found on earth.

142. geometry

In rectangle ABCD line EF joins the midpoint of line AB and BC. Line BE equals 5, line BF equals 12, find line EF, line AC and perimeter of the rectangle.

143. physics

An electron starts at rest. Gravity accelerates the electron in the negative y direction at 9.80 m/s2 while an electric field accelerates it in the positive x direction at 3.80×106 m/s2. Find its velocity 2.45 s after it starts to move.

144. physics

school question? A long jumper travels 8.95 meters during a jump. He moves at 10.8 m/s when starts his leap. At what angle from the horizontal must he have been moving when he started his jump? You may need the double-angle formula: 2 sin u cos u = sin

239. Chemistry!!

Determine the pH of 0.100 M aqueous HCN to two decimal places, and determine the concentration of CN- at equlibrium to two singificant figures. Can you show me all the steps to this question? Please and thank you!

240. Music

Did will smith write his own music?

241. PSY 202

Identify the benefits of life experiences for the adult student? Help!!

how do you find the range of a math problem if you have all even numbers?

Can you tie in a leaked U.S. document that referred to particular countries called the "Axis of Mischief" according to the Bolivarian Alternative for the Nations of Our America?

244. math

Write the product 35/14 x 3/125 in scientific notation.

245. PSY 202

why is it important to considereach domain in the study of adult development?

246. algebra

simplify (x+3)^2= 19

247. trigonometry

solve: 2cosx-1=0

248. spanish

need pictures about story on fian arroyo

249. geography

Taken as a whole, what would you say is the single most pressing problem found in Latin America or South America? What possible solutions can you develop?

250. PSY 202

How can adults reject negative influences and benefit from positive ones in their current life?

251. maths

how arithmetic and geometric progression can be used to solve problems related to banking business?

252. global

Does cultural diffusion unite or divide our world today?

253. Mathematics

If a pentagon is dialated which of the folloeing characteristics change? 1.side lenght 2.area 3.the coordinates i think tis 2 & 3 but not sure.

254. chemistry

my moth balls froze at 54 degrees celsius, what kind are they?

255. french

How would you say it would be necessary using the verb falloir?

256. math

Solve 9-2(3x+1)>37

257. Algebra

Make d the subject L=4ðCx(x is set off the line)d^2

258. MATH

simplify |-7+2|-|-4|

259. algebra

parallel lines never meet because they are a) far apart b)equidistant c)horizontal d)vertical

260. math

when you put something in parenthesis like C(25,8) what does that mean or how do you solve it?

261. math

im a fourth grader asking if 13 feet, 6inches is greater than or less than 5 yards. please tell me the correct answer

262. math

what are all the factors of 30?

263. math

what is the greatest common factor of 6 and 12?

264. math

What is the average of two real numbers is 17.5 and their product is 250

265. English

Thank you very much for your corrections. Here are some more sentences I'm not sure of. 1) Shopping list: how do you call ten one-litre bottles of sparkling water? a half-a-litre bottle of wine 2) I usually spread nut-cream on a slice of bread for (?)

266. bio

what is the sociobiology controbersy?

267. Simplify alegebra 2

-5ã2(4ã2 - 3ã3)

268. algebra 1

Find-x when x=- 7/51

269. Algebra 1

What are three ordered pairs that are a soultion to the equation 3x-1=-2?

270. algebra

y = 1/2 x -3. what is the slope? a)-3 b)3 c)1 d)1/2

271. Math

-x^2+4x=-43 I forgot how to do this? Any help would be appreciated.

272. infinitives

Adena wants Sam to learn to change a tire. to learn -infinitive used as adj. to change - infinitive used as an adverb?

273. Toms River

If you have 23 kids in a class how many of them are 5ft 2ins or taller? And how many are shorter?

Name 2 fractions that are equivalent to 3 4th

275. Science

Which of earth's layers contains the most mass?

asked by The Official Pancake Queen
276. Math

I have two unknown numbers x and y, and the sum of x and y(x+y) is 78 and the product is (x*y) is 896

277. Music

dose anyone know who influenced black sabbath?

278. ALgebra

x/3x^2 - x-3/3x^2+x-10

279. social studies

what is considered alexander the great most lasting achievment?

280. social studies/writing

we have i pproject and i need to find some information on washhiington d.c. i need to find a hisstoric place in washington d.c that starts a d-z. (i am still working on them.)

10 - 5 4/11

282. Math

9 1/8 - 2 5/8 can you explain to me how 9 becomes 8 something?