Thursday

December 8, 2016
Total # Posts: 3,591

**chemistry**

how much toluene (C7H8) is need to make 47.3 (g) of TNT (C7H5N3O6) by the equation given below? C7H8+ HNO3 - C7H5N3O6 + H2O

*March 26, 2013*

**chemistry**

for the reaction of 14.69 g of ethyl alcohol with 22.5 g of oxygen. which is the limiting reagent? how much CO2 will be produced? if 19.5 g of CO2 is actually produced, what is the percent yield? C2H5OH(1) + 3 O2 (g) - 2 CO2 (g) + 3H2O(g)

*March 26, 2013*

**physics**

The figure shows a 0.3 kg baseball just before and just after it collides with a bat. Just before, the ball has velocity of magnitude 11.4 m/s and angle = 31.4 degrees. Just after, it is traveling directly upward with velocity of magnitude 9.00 m/s. The duration of the ...

*March 25, 2013*

**statistics**

In a recent study on gender differences in education, a sample of 7 boys had a mean score of 18.5 and a standard deviation of 4.1 on a Standardized Math Test. A sample of 11 girls had a mean score of 19.9 and a standard deviation of 3.6 on the same test. What is the t-...

*March 24, 2013*

**physics**

a positive test charge of 3.0uC experiences a force of 0.75 N in an electric field. What is the magnitude of the electric field at the location of the test charge?

*March 23, 2013*

**physics**

a positive test charge of 3.0uC experiences a force of 0.75 N in an electric field. What is the magnitude of the electric field at the location of the test charge?

*March 23, 2013*

**math**

Which equivalent fraction would you have to use in order to add 3/5 to 21/25

*March 21, 2013*

**chemistry**

Condition Pressure Volume Temperature Comment initial 1.0 atm 22.4 L 273 K 1 mole of N2 gas fills the tank. final 3.0 atm 22.4 L 273 K 2 moles of O2 gas have been added to the 1 mole of N2 gas in the tank. Key Questions 7. What was the initial pressure caused by the nitrogen ...

*March 21, 2013*

**chemistry**

The mole fraction of oxygen in air is 0.209. Assuming nitrogen is the only other constituent, what are the partial pressures (in torr) of oxygen and nitrogen when the barometer reads 780 torr?

*March 20, 2013*

**chemistry**

Calculate the partial pressure of 3.25 moles of oxygen that have been mixed (no reaction) with 1.25 moles of nitrogen in a 25.0 L container of 298 K.

*March 20, 2013*

**chemistry**

dont answer i figured it out:D

*March 20, 2013*

**chemistry**

Mixtures of helium and oxygen are used in scuba diving tanks to help prevent ‘the bends’, a condition caused by nitrogen bubbles forming in the bloodstream. If 95 L of oxygen and 25 L of helium at STP are pumped into a scuba tank with a volume of 8.0 L, what is the ...

*March 20, 2013*

**socials please check**

thank you :)

*March 19, 2013*

**socials please check**

how many time zones are there in canada? My options are: a.) 5 b.) 10 c.) 7 though i tried answering this and i got 6? what is the correct answer

*March 19, 2013*

**Socials please check my answers**

thanks :)

*March 19, 2013*

**Socials please check my answers**

pleaes chack my answers: what are the horizontal lines on a map called? my answer= latitudes what are the vertical lines on a map called my answer= longitudes

*March 19, 2013*

**math**

thank you :D

*March 18, 2013*

**math**

There are 3 pitchers of juice. Each student will be served one fourth of the juice in a pitcher. How many students will get juice? l a. Draw lines on the pitchers to show how many students these pitchers will serve. b. Write a number model to describe the problem.

*March 18, 2013*

**math**

help?

*March 18, 2013*

**math**

There are 3 pitchers of juice. Each student will be served ^ of the juice in a pitcher. How many students will get juice? l a. Draw lines on the pitchers to show how many students these pitchers will serve. b. Write a number model to describe the problem.

*March 18, 2013*

**grammar help**

thank you :)

*March 11, 2013*

**grammar help**

Aunt Dessie unfolded out of the car like a carpenter’s ruler” is an example of personification. symbol. simile. metaphor.

*March 11, 2013*

**science**

There are three particles inside an atom. One of them has zero electric charge. Which one is it?

*March 10, 2013*

**science**

There are four forces in nature. Name the four forces and rank them from strongest to weakest.

*March 10, 2013*

**5th grade math (word problems)**

Nevermind.. 1st problem was 6.25 and stayed at 6 because that would be the same amount for everyone. For #2, 3.75 was the average. But, need to stay at whole cup which would 3 for everyone to have equal amount, right?

*March 9, 2013*

**5th grade math (word problems)**

oh.. so you multiplied 8 * 3 instead of 4. But, I thought I needed to round 3.75 up to 4. But, if using 8 *3, then 30-24 = 6. There are 6 cups left over. So, when shouldn't i round up? THe 1st problem with the pizza, I also rounded up.

*March 9, 2013*

**5th grade math (word problems)**

So for #2, I should have divided by 8 members? 30/8 = 3.75; but 8*4 = 32 which is more than 30cups. I'm not sure how to solve this now.

*March 9, 2013*

**5th grade math (word problems)**

I got these problems wrong in class. but, think i have the right answer now. Can you check? 1. Jim's mother made pizzas for his birthday. SHe sliced the pizzas into 50 slices. She served Jeff and his 7 guests the same number of slices and she ate the rest. How many pieces ...

*March 9, 2013*

**Math**

$27 is left.

*March 8, 2013*

**Social Studies**

Pacific.

*March 7, 2013*

**5th grade math (word problems)**

Thank you Ms. Sue!!

*March 7, 2013*

**5th grade math (word problems)**

I'm not sure how to solve the following problem. I don't think i have enough information. Ali deposited $120 in her savings account. This represents 75% of the money she received for her birthday. She pent the rest of her money on a lego toy. How much did the lego cost...

*March 7, 2013*

**english**

Clark sees that the wind in the nebraska setting has changed aunt georgina by? A. bending her shoulsers B. rotting her teeth C. yellowing her skin D. dirttying her clothes

*March 7, 2013*

**spanish**

this is part of a spanish project and i need to know if i placed the accent marks correctly or forgot to put some of them. please help! Inglés Matemáticas Ciencias Sociales Ciencias Naturales Arte Música Geometria Biologia Hay que llevar el carnet de ...

*March 6, 2013*

**Social studies **

what are the 50 us states postal abbreviations and state numbers?

*March 6, 2013*

**algebra one**

{n|n<13} which is the same as n<13

*March 6, 2013*

**Physics**

A 100 watt bulb emits light in all directions. The distance R from the bulb is equal to 1.0 meter. Complete the table below with calculated values of intensity of the bulb. Distance from Source Intensity (W/m2) R ? 2R ? 3R ? c) If the bulb was replaced by a 75 watt bulb, at ...

*March 5, 2013*

**Physics**

A radio tunes in radio waves which have a wavelength of 3.13 meters. What frequency is the radio tuned to in MHz?

*March 5, 2013*

**Physics**

An astronomer looks at a comet which is 5.92 x 109 km away. How many minutes did it take the light from the comet to reach the astronomer?

*March 5, 2013*

**3rd grade math**

4 Quarters times 8 Minutes times 7 games is 224 minutes.

*March 5, 2013*

**physical science**

Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why?

*March 4, 2013*

**chemistry**

Hey, I was just struggling with a question that I need to figure out to help me with my next lab, so if any of you guys could help me that would be greatly appreciated. Question: write a balanced equation for the reaction between H2O2 and acidified MnO4-

*March 4, 2013*

**Math**

6_5

*March 3, 2013*

**physical science**

Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why?

*March 3, 2013*

**physical science**

10. A balloon has a volume of 0.5 L at 20°C. What will the volume be if the balloon is heated to 150°C? Assume constant pressure and mass.

*March 3, 2013*

**physical science**

3. Atmospheric pressure at the top of Mt. Everest is about 150 mm Hg. That is why climbers always bring oxygen tanks. If a climber carries a 12.0 liter tank with a pressure of 35,000 mm Hg, what volume will the gas occupy if it is released at the top of Mt. Everest?

*March 3, 2013*

**physical science**

3. Atmospheric pressure at the top of Mt. Everest is about 150 mm Hg. That is why climbers always bring oxygen tanks. If a climber carries a 12.0 liter tank with a pressure of 35,000 mm Hg, what volume will the gas occupy if it is released at the top of Mt. Everest?

*March 3, 2013*

**physical science**

Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why? this is the answer

*March 3, 2013*

**physical science**

I was not wrong

*March 3, 2013*

**physical science**

1. Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why in your own words.

*March 3, 2013*

**chemistry**

What volume (mL) of a 3.23 %w/v saline solution contains 69.1 mg of NaCl?

*March 3, 2013*

**science**

3. Atmospheric pressure at the top of Mt. Everest is about 150 mm Hg. That is why climbers always bring oxygen tanks. If a climber carries a 12.0 liter tank with a pressure of 35,000 mm Hg, what volume will the gas occupy if it is released at the top of Mt. Everest?

*March 1, 2013*

**science**

1. Boyle’s law states that if you squeeze a fixed amount of a gas into a smaller volume, the pressure will increase. Explain why in your own words.

*March 1, 2013*

**Alg. I**

A cylinder has a radius of 3 cm and length of 10 cm. Every dimension of the cylinder is multiplied by 3 to form a new cylinder how is the ratio of the volumes related to the ratio of corresponding dimensions

*February 28, 2013*

**Math**

3000, the farmer can just carry the bananas over.....

*February 28, 2013*

**CHEMISTRY**

Hydrogen cyanide is used in the production of cyanimid fertilisers. It is produced by the following reaction: 2CH4 + 2NH3 + 3O2 2HCN + 6H2O (a) How much hydrogen cyanide can be produced starting with 100 kg of each of the reactants? (b) Which is the limiting reagent?

*February 27, 2013*

**biology**

what characteristics appear to show consistent development over the 4 million years of hominid evolution?

*February 26, 2013*

**English**

Help! I need help unscrambling these letters into two words it is due tommorow! The letters are tttrrlnemisianaaon it is the name of a mall, remember its a two letter word

*February 26, 2013*

**Math **

At a certain time of day, a tree that is Xft tall cast a shadow that is X-35 meters long if the distance from the top of the tree to the end of the shadow is X+5 meters, what is the height, X, of the tree?

*February 26, 2013*

**Math**

24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers

*February 26, 2013*

**Math**

24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers

*February 26, 2013*

**Math**

24x^3y^2/42x^7y^-6 please help i need to simplify i can only use positive intergers

*February 26, 2013*

**biology**

In a chorus of male frogs of one species, which would be considered by evolutionary biologists to be the fittest? The biggest frog. The frog that has the most descendants. The frog with the largest territory. The loudest frog. The frog that attracts the most females. I am ...

*February 24, 2013*

**biology urgent **

In mice, a gene controlling coat colour has 2 alleles; B (black) and b (white). A pure breeding black mouse is crossed to a white mouse and all the offspring are black. The offspring are then crossed to white mice. The phenotypes of the offspring of this second cross are ...

*February 24, 2013*

**Math help**

thank you

*February 24, 2013*

**Math help**

Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth length 10 cm width 4 cm height 10 dont tell me the answer just show me how to do it

*February 24, 2013*

**Math Alex**

the options are 14.7 10.8 12.2 15.6

*February 24, 2013*

**Math Alex **

Calculate the length of the diagonal for the given rectangular prism. Round to the nearest tenth length 10 com width 4 height 10

*February 24, 2013*

**Chemistry**

Ammonia is composed of hydrogen and nitrogen in a ratio of 9.33 g of nitrogen to 2.00 g of hydrogen. If 2.19 g of nitrogen combined completely with hydrogen to form ammonia, what mass (g) of ammonia would be formed?

*February 23, 2013*

**Algebra**

I am pretty sure this goes like this 4y+3=3y+x (i) 2x+4y=18 (ii) Rearrange (i) so that x=4y+3-3y Take (ii) and sub x it will become 2(4y+3-3y)+4y= 18 2(y+3)+4y =18 2y+6+4y=18 6y+6=18 6y=18-6 6y=12 y=12/6 y=2 (iii) Now use what you found for y in (iii) and sub in the (ii or i ...

*February 22, 2013*

**Math question?**

how to get diagonal saying lenght hight width

*February 22, 2013*

**Math question?**

Calculate the length of the diagonal for the given rectangular prism. It says length hight width but in the lesson it says length hight deph how to i find the diagonal example

*February 22, 2013*

**Math ASAP**

Bonnie has a rectangular photographic print that is 5 inches wide and 7 inches long. If she multiplies both the length and width by 1.5, how will the perimeter of the print increase?

*February 22, 2013*

**English help ASAP**

thanks

*February 21, 2013*

**English help ASAP**

Which of the sentences below is punctuated correctly? (1 point )I opened the door and my cat ran outside. I opened the door, and my cat ran outside. I opened the door, my cat ran outside. i think its 2

*February 21, 2013*

**music**

Started by the creoles and went away from the norm of the classical and romantic style in western Europe. Also, it had slave rhythms which were unique to each plantation.

*February 21, 2013*

**Math**

Kelsea has 6 coins. One-third of her coins are dimes. The value of the dimes is one-fourth the value of the coins. How much money does Kelsea have?

*February 21, 2013*

**Math Please answer**

how to find slope of a graph without points please make it as simple as possible

*February 19, 2013*

**math!!!!!!**

the options are 6 3 9 and 12 i think its 9

*February 13, 2013*

**math!!!!!!**

How many lateral edges are there in a triangular prism

*February 13, 2013*

**Math problem**

The area of a triangle is equal to 1/2 the hight times the base. A triangle has a height of 10 and a base of 20. If the height of the triangle is increased by 10% and the base is decreased by 10%, then the area of the new triangle formed___________. ? a)stayed the same b) ...

*February 12, 2013*

**Physics**

A quantity of monatomic ideal gas expands adiabatically from a volume of 2.0 liters to 6.0 liters. If the initial pressure is P0, what is the final pressure?

*February 12, 2013*

**physics**

As your bus rounds a flat curve at constant speed, a package with mass 0.900 , suspended from the luggage compartment of the bus by a string 46.0 long, is found to hang at rest relative to the bus, with the string making an angle of 27.0with the vertical. In this position, the...

*February 10, 2013*

**physics**

A toboggan approaches a snowy hill moving at 15.0 m/s. The coefficients of static and kinetic friction between the snow and the toboggan are 0.460 and 0.350, respectively, and the hill slopes upward at 41.0 above the horizontal. Find the acceleration of the toboggan as it is ...

*February 8, 2013*

**Social studies ASAP**

Which of the following helped to increase the populations of northeastern cities more diversity successful cotton crops growth of factories and trade building of the Erie Canal i chose building of the erie canal

*February 8, 2013*

**science**

1. When you hold a piece of chocolate in your hand, why does the chocolate melt? 2. Which is a larger unit of heat: calorie, kilocalorie, Btu, or joule?

*February 7, 2013*

**math probability**

If I had the many black grey and white socks and i pulled out 2 socks that did not match. How many more socks do i have to take out of my drawer to be certain to have a matching pair

*February 6, 2013*

**maths**

Using properties of the triple scalar product and triple vector product, prove that (a ^ b) (c ^ d) = (a *c)(b * d) - (a * d)(b * c): [Hint: start by thinking of (a ^ b) (c ^ d) as (a ^ b) e, where e = c ^ d]

*February 6, 2013*

**math**

Find the percent of decrease. Original rent: $600 New rent: $450

*February 6, 2013*

**history**

who was the united states able to win the war in the pacific?

*February 5, 2013*

**history**

who was commander of the u.s. troops on bataan?

*February 5, 2013*

**5th grade math**

Dick

*February 4, 2013*

**Physics**

The radio station WBRU broadcasts in the radio spectrum at 95.5 MHz. What is the wavelength of this electromagnetic wave in meters?

*February 4, 2013*

**Math**

Please help with the following questions: 1. write 12 million in scientific notation 2. Write 17,600 in scientific notation 3. write 1.2 * 10 to the fourth power in standard form 4. write 5 * 10 to the sixth power in standard form

*February 4, 2013*

**history**

thanks

*February 2, 2013*

**history**

what was necessary for the united states to be able to increase its production of war materials in a short period of time?

*February 2, 2013*

**Geography**

What is the name of the salt lake located on the border between Israel and Jordan? I think the answer is the Dead Sea, is that right?

*January 30, 2013*

**science**

Would you expect a substance to be a solid, liquid, or gas at absolute zero? Explain your answer.

*January 29, 2013*

**math ALGEBRA 1 PLEASE HELP!**

You have $2.75 in dimes and quarters, and you have a total of 17 dimes and quarters. How many of each type of coin do you have?

*January 28, 2013*