Sunday

September 25, 2016
Total # Posts: 421

**chemistry -3.2.4**

Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...

*September 15, 2016*

**chemistry - 3.1.6**

At a high temperature, the equilibrium constant for the decomposition of hydrogen iodide is 65.0. If the initial concentration of HI is 1.60 M, what is the concentration of hydrogen at equilibrium? 2Hl(g) H2(g) + I2(g) A. 1.42 M B. 0.753 M C. 0.240 M D. 0.802 M I'm ...

*September 15, 2016*

**chemistry - 4.1.4**

The [OH-] ion concentration of a sample is 1 × 10-10 M. What is the concentration of [H+] in the sample at 25°C? A. 1 × 10-14 M B. 1 × 10-4 M C. 1 × 10-10 M D. 1 × 10-6 M I think the answer is C. is this correct?

*September 15, 2016*

**chemistry**

The titration of HCl with NaOH is an example of: A. a strong acid-weak base titration. B. a weak acid-weak base titration. C. a weak acid-strong base titration. D. a strong acid-strong base titration. I know that this is a strong acid but not sure about the base? what do you ...

*September 15, 2016*

**chemistry**

What is a neutralization reaction? A. A reaction that involves neutral reactants B. A reaction in which the reactants are a salt and water C. A reaction in which the product is either acidic or basic D. A reaction that removes essentially all H+ and OH- I know that it isn'...

*September 15, 2016*

**chemistry**

I think that the answer to this one is A, as i know that the concentration of the reactants is high. I'm not sure about whether its products or reactants as the numerator though?

*September 15, 2016*

**chemistry**

If the equilibrium constant is much less than 1, what can you conclude about the concentrations of the reactants and products? A. Reactants are in the numerator of the equilibrium expression, so the concentration of the reactants is high. B. Products are in the numerator of ...

*September 15, 2016*

**chemistry**

How can you shift the equilibrium of the reaction between hydrogen and chlorine toward the products? H2(g) + Cl2(g) --> 2HCl(g) A. Add Cl2. B. Remove H2. C. Increase the pressure. D. Add HCl. would the answer to this one be to add Cl2? so answer A?

*September 15, 2016*

**chemistry**

not sure. can you show me how to work through it?

*September 15, 2016*

**chemistry**

Given the reaction: Cu2+(aq) + S2-(aq) CuS(s) What will happen (a) if CuSO4(aq) is added? And (b) if Na2SO4(aq) is added? A. (a) Nothing; (b) Less product will form B. (a) Less product will form; (b) Nothing C. (a) Nothing; (b) More product will form D. (a) More product will ...

*September 15, 2016*

**chemistry**

the answer was B? K<Q

*September 15, 2016*

**chemistry**

The equilibrium constant for the formation of phosphorus pentachloride is 1.9. If the partial pressure of each gas is 0.5 atm, will the reaction (as written) proceed forward or backward to reach equilibrium? PCl3(g) + Cl2(g) PCl5(g) A. Backward, because K is greater than Q B. ...

*September 15, 2016*

**chemistry**

What effect does raising the temperature of the reaction chamber at a constant pressure have on the following reaction at equilibrium? 2NO2(g) N2O4(g) + heat A. The equilibrium shifts toward the reactants because the reverse reaction is endothermic. B. The concentration of NO2...

*September 15, 2016*

**chemistry**

Why does the density of gas in a hot air balloon decrease as the gas is heated? A. The mass of gas decreases as temperature increases. B. The mass of gas increases as temperature increases. C. The volume of gas decreases as temperature increases. D. The volume of gas increases...

*September 14, 2016*

**AP Chemistry**

sorry for commenting on a q that isn't mine but my calculator doesn't let me find the value for 10^-7. do you know why? and also what the value is?

*September 14, 2016*

**chemistry**

What is the chemical equation that describes the complete neutralization of H3PO4 by NaOH? A. H3PO4 + 2NaOH Na2HPO4 + 2H2O B. H3PO4 + H2O H2PO4- + H3O+ C. H3PO4 + NaOH NaH2PO4 + H2O D. H3PO4 + 3NaOH Na3PO4 + 3H2O

*September 14, 2016*

**chemistry**

Which of the following is true about the results of a neutralization reaction? A. An acid and a base form water and salt. B. Water reacts with a base to form the hydroxide ion. C. Water reacts with an acid to form the hydronium ion. D. An acid and a base dissociate into their ...

*September 14, 2016*

**chemistry**

Knowing what information would allow you to order gas molecules according to their velocity? A. Pressure and temperature B. Volume and molecular mass C. Pressure and volume D. Temperature and molecular mass

*September 14, 2016*

**chemistry**

How does table salt (NaCl) dissolve in water? A. Water molecules hydrogen bond with sodium ions and chloride ions. B. Each sodium ion is surrounded by chloride ions. C. Each NaCl molecule is surrounded by water molecules. D. The oxygen atoms in water molecules attract sodium ...

*September 14, 2016*

**geometry**

The perimeter of triangle ABC is 13 cm. It was dilated to create triangle A'B'C' The perimeter of triangle...is cm

*August 31, 2016*

**Biology**

What is your answer?

*August 30, 2016*

**medical insurance**

the patient is seen by his family physician for follow-up treatment of recently diagnosed asthmatic bronchitis. the physician's fee is 75$. the patient copayment is 20$, and the patient is not required to pay any additional amount to provider. the payer reimburses the ...

*July 14, 2016*

**math help please **

The distance a spring stretches varies directly with the force applied to it. If a 7-pound weight stretches a spring a distance of 24.5 inches, how far will the spring stretch if a 12-pound weight is applied?

*January 12, 2016*

**math help please **

A jewelry store uses a markup rate of 70% on all items. If the wholesale price of a pair of earrings is $15.00, what is the retail price for the earrings?

*January 12, 2016*

**math help please **

Morgan had a bag of jolly ranchers. She counted 8 watermelon flavored candies in the bag of 46. If she bought a super-size bag with 138 jolly ranchers, how many could Morgan expect to be watermelon flavored?

*January 12, 2016*

**math help please **

Chumley from the TV show "Pawn Stars" bought some vintage watches for $15 each. He sold five of the watches for $36 each. What was the total amount of profit made for the watches sold?

*January 12, 2016*

**math help please **

On the blueprint of a portable stage is 1 cm = 10 m. The length of the stage on the blueprint is 2 cm and the width is 1/2 cm. What is the perimeter of the actual portable stage?

*January 12, 2016*

**math help please **

The graph gives a breakdown of the hours students use the tutoring center. If the graph is based on 300 students, how many used the center 8 to 10 hours during the week? 1-3 h 27% 3-5 h 22% 5-8 h 26% 8-10 h 15% over 10 h 10%

*January 12, 2016*

**math help please **

Miranda baked 48 muffins to sell at the school bake sale. She sold 2/3 of the muffins and gave the rest to her friends to eat. How many muffins did she sell?

*January 12, 2016*

**math help **

Claire earns a 15% commission from her lipstick sales. Her sales for the month of April were $400. How much commission did Claire earn for her April sales?

*January 12, 2016*

**math help **

On the blueprint of a portable stage is 1 cm = 10 m. The length of the stage on the blueprint is 2 cm and the width is 1/2 cm. What is the perimeter of the actual portable stage?

*January 12, 2016*

**math help **

The temperature at 1:00 pm on Tuesday was -13C. There was an increase of -6 per hour starting at 1:00 pm. Which of the following best represents the Celsius temperature n hours after 1:00 pm on Tuesday?

*January 12, 2016*

**math help **

Tia's parents gave her $20 to spend at the Spring Carnival. She spent $5 on a funnel cake and the remaining money on tickets for rides. If each ride ticket costs $0.75, how many ride tickets did she purchase?

*January 12, 2016*

**math help **

Jimmy spends ¾ of an hour getting ready for school. It takes 30 minutes to travel to school. If he needs to be at school at 9:00 am, what time should he get up?

*January 12, 2016*

**math help **

Hank rode his motorcycle half the distance from Lumberton to Wilmington, which are 70 miles apart. How many miles did he ride?

*January 12, 2016*

**math**

It is 3 miles around Westwood Park exercise trail. After skating around the trail 5½ times, Mr. Zorn lost a wheel. How many miles had he skated? Round your answer to the nearest mile.

*January 12, 2016*

**math**

Donald bought 10 woodcarvings for a total of $220. If they were all the same price, how much did he pay for each wood carving?

*January 12, 2016*

**math 1**

An advertiser needs a 4-inch picture of a 14 foot automobile. What is the scale factor? Write your answer in simplest form using a colon.

*January 11, 2016*

**math 1**

Sarah calculated the points she earned on her test. Sarah thought she earned 95 points but the teacher told her she actually only scored 85 points. What was Sarah's percent error. Round to the nearest tenth.

*January 11, 2016*

**math**

target is advertising a Sony camcorder for $299.99 this week. If the regular price is $329.99, what is the percent of discount customers are receiving for this item? Round your answer to the nearest whole number.

*January 11, 2016*

**math**

3.6 is 12% of what number?

*January 11, 2016*

**math**

A jewelry store purchases earrings from a manufacturer for $5.00 each. If the store wants to mark up the price by 75%, what will be the retail price of the earrings?

*January 11, 2016*

**chemistry**

How many formula units are in 1.31 mg of hydrogen peroxide (H2O2)? Answer in units of formula units. For 508 g of butadiene (C4H6) calculate the number of moles. Answer in units of mol. Calculate the number of molecules. Answer in units of molec. 016 1.0

*January 10, 2016*

**chemistry**

How many molecules are in 24.0 g NO2? Answer in units of molec.

*January 10, 2016*

**chemistry**

How many molecules are in 0.0700 mol NH3? Answer in units of molec.

*January 10, 2016*

**chemistry**

How many molecules are contained in 1.30 mol O2? Answer in units of molec.

*January 10, 2016*

**chemistry**

How many grams do 6.2×1024 atoms of argon weigh? Answer in units of g.

*January 10, 2016*

**Math And Science for Young Children**

No, A

*January 9, 2016*

**Chemistry **

A pot containing 500 g of water at 100 degrees Celsius would require how much energy to boil off completely

*December 7, 2015*

**math 7th **

a candle was 45 cm long .It was lit and 20% burned off .The candle went out.The next day it was lit again ,and 25% of the remaining candle burned out .then it went out On the third day the candle was lit 1/3 of the remaining amount burned off .then it went out .how long was ...

*December 1, 2015*

**math 7th **

the cost (c) is twice of the cost of a 7$ tape what is the price of the cd

*December 1, 2015*

**math **

Juan sold a boat that he bought 5 years ago. He sold it for 70%less than he originally paid for it. If the original cost is b , write an expression that shows how much he sold the boat for

*November 18, 2015*

**math**

Ms.Sue i need your help please

*November 18, 2015*

**math **

pine city (x) is less than or equal to 20 miles from sun vally depending on the route you take how many miles is pine city from sun vally

*November 18, 2015*

**math**

Ms .sue i think s is for march sales

*November 18, 2015*

**math **

this month`s sales of $85,000 are greater than 1/2 of the sales of march repesented by the letter . What was March`s sales .

*November 18, 2015*

**Chemistry**

How do you find the Ka1 and Ka2 of oxalic acid when it is in a solution that is 1.05 M H2C2O4 and has a pH of 0.67. [C2O4^2-] = 5.3x10^-5 M. I have tried using an ICE table for both reactions, as oxalic acid is a diprotic acid, but I am having trouble knowing where to put ...

*November 1, 2015*

**Physics**

A student standing on the ground throws a ball straight up. The ball leaves the student's hand with a speed of 17.0 m/s when the hand is 1.50 m above the ground. How long is the ball in the air before it hits the ground? (The student moves her hand out of the way.)

*September 17, 2015*

**Algebra**

I'm trying to find the sum of this geometric series but I can't find a common ratio. How do I find it? 1+1/5+1/25+...

*September 8, 2015*

**Algebra **

I'm trying to find the sum of this geometric series but I can't find a common ratio. How do I find it? 1+1/5+1/25+...

*September 8, 2015*

**Algebra**

I've been try to solve this equation and I can't seem to get far. Do you add 3 to both sides? If not please explain to me how you solve this. Thanks :) 1/2=2/5c-3

*September 1, 2015*

**organic chemistry**

isobutyl tert pentyl acetylene has how many hyrogen atoms? iso=2 butyl=4 tert=4 pentyl=5 acetylene=2 28 h atoms? can you please teach me how to compute hydrogen atoms.. Neoheptane has how many atoms?

*July 11, 2015*

**organic chemistry**

evaluate the number of carbon for the ffg. pairs by writing G if greater, L if less than or E if equal 1. butene E sym dimethylethylene sol'n: butene has 4 carbons and sym dimethylethylene also has 4 carbons so it's equal. Am i right? 2. methylbutane L isopentane ...

*July 11, 2015*

**algebra**

morgan saw 10 blue cars 8 red cars and 42 white cars drive by her house in 1 hour what is the experimental probability that the next car will not be white

*March 12, 2015*

**math**

maria throws a ball straight up with an initial velocity of 10m/s what is its velocity at the highest point?

*March 10, 2015*

**Math**

Pick any single digit number. Multipy it by 12,345,679. Then multiply the result by 9. What happens? Explain why this works.

*March 1, 2015*

**Math**

John and Miles each had some money. First Miles gave John a quarter. Then John gave Miles one-third of his money. Then Miles gave John one-third of his money. At the end, John had $2.50 and Miles had $2.00. How much did they each start with?

*February 26, 2015*

**Math**

After dinner, three friends at a restaurant paid their bill and noticed a bowl of mints on the front counter. Sean took one-third of the mints but returned four because he had a momentary pang of guilt. Fred then took one-fourth of what was left but returned three for similar ...

*February 22, 2015*

**Math**

Three boxes each contain a number of billiard balls. One box contains only even-numbered balls, one box contains only odd numbered billiard balls, and the third box contains a mixture of odd and even numbered balls. All the boxes are mislabeled. By selecting one ball from only...

*February 17, 2015*

**Math**

A 6 story building has stairs between equally spaced doors. How many times higher is the climb from the first to the sixth floor than the climb from the first to the third floor?

*February 16, 2015*

**math**

Suppose in a town three-fourths of the men are married to one-half of the women. What is the ratio of men to women in this town?

*February 12, 2015*

**Math**

How did you get y=1.56x?

*February 12, 2015*

**Math**

Suppose in the early 1900s the levels of CO2 in the atmosphere was only 64% of the levels of CO2 today. What percentage more is the level of CO2 today compared to the levels of CO2 in the early 1900s?

*February 12, 2015*

**Math**

A mixture is 20% red paint, 35% yellow paint, and 45% water. If 5 quarts of red paint are added to 20 quarts of the mixture, what is the percentage of red paint in the new mixture?

*February 10, 2015*

**Math**

Well, I subtracted 1000-800= 200 miles, which was my remaining miles. She wants to finish at an average of 1000 mph so that she would have flown at an average of 1000mph, so speed is 1000mph. I plugged in this values in the formula: average speed=distance/time... 1000=200/time...

*February 10, 2015*

**Math**

A jet pilot is making a 1000 mile trip in her military Tomcat. She flies 800 mph for one hour and decides she wants to finish the trip so that she would have flown at an average of 1000 mph. How fast should she go to finish the trip and meet her goal?(Hint: Think carefully ...

*February 10, 2015*

**Math**

But, what shapes are those measurements?

*February 10, 2015*

**Math**

If a field has perimeter P, what shape maximizes the area? Justify your reasoning.

*February 10, 2015*

**Math**

Explain why the product of any two consecutive natural numbers is even. Prove your conjecture.

*February 10, 2015*

**Math**

Find all pairs of integers such that when they are added they equal 100, and when they are multiplied they are at least 2000.

*February 10, 2015*

**Math**

Pick what age you would like to be (may be your actual age if you like). Add 10. Multiply the result by 4. Add 200. Divide by 4. Subtract your original number. The final result is 60. Explain how I knew that.

*February 10, 2015*

**Math**

What is 100^2-99^2+98^2-97^2+96^2-95^2 +...+ 4^2-3^2+2^2-1^2 ? (Find an expression where n is the largest number being squared, then use it to calculate the sum when n = 100. Hint: Examine specific cases where n is small. Then generalize).

*February 9, 2015*

**Math**

In a group of 9 coins, one is fake and weighs slightly less. What is the fewest number of times you need to use a pan balance to find the counterfeit coins? (A pan balance is a scale used to measure weights, where weights are placed in two pans. The heaviest pan will go down ...

*February 3, 2015*

**Math**

Find the remainder when 3^997 is divided by 5. n=1 3n/5=3/5 n=2 3^2=9/25 n=3 3^3=27/5 n=4 3^4=81/5 n=5 3^5=243/5 r=3,4,2,1,3,4,2,1 n=997

*February 3, 2015*

**Math**

Randy had a sheep that started eating more and more as each day passed. on the first day, Tandy's sheep ate 5 carrots. On the second day, Randy's sheep ate 11 carrots. On the third day, the sheep ate 18 carrots. And on the fourth day, the gluttonous sheep ate 26 ...

*February 3, 2015*

**statics**

A1 Helicopter in flight with unbalanced stores A helicopter in forward flight is shown in Figure 1. The helicopter in forward flight experiences a horizontal drag force DF . The drag force DF is assumed to pass through O. The helicopter is held up in the air ...

*February 2, 2015*

**Physics**

You swing a 2.40kg stone in a circle, using the full length of a thin 60.0cm rope.

*November 1, 2014*

**Physics**

Your new designer chair has an S-shaped tubular metal frame that behaves just like a spring with the spring constant 13500 N/m. When your friend, who weighs 910 N, sits on the chair, how far does it bend?

*September 26, 2014*

**math**

never mind, i figured it out! :) g= 50

*September 7, 2014*

**math**

Given that: 4(2g + 104) - 96 = 504 + 6(g - 14), solve for g. i'm confused on how to set this problem up - if anyone could help that would be great. thank you.

*September 7, 2014*

**Biology 30**

In what size populations might you expect it to be relatively common for alleles to become fixed? Why? I think that larger populations would be more likely to have fixed alleles, since perfect Hardy-Weinberg equilibrium states that there will be no change in allele frequency ...

*May 23, 2014*

**HELP!**

Next year (sophomore year) I'm taking the following courses: Honors Algebra II/Trig Spanish III Health AP Biology Honors English AP World History Is AP Bio and world history hard? or no it's not just the exam. Please tell me because this is my first year taking AP.

*April 14, 2014*

**statistics**

a. with replacement? b. without replacement?

*April 7, 2014*

**statistics**

if 2 out of 100 second graders are randomly selected, find the probability that they are both boys and like spring. boys/spring 39

*April 7, 2014*

**math**

a storage room measures 11.35 feet in length by 9.5 feet in width by 8.3 feet in height. it contains a box which is 4.25 feet in length 6.5 feet in width and 4.0 feet in height.how many cubic feet of storage space are left in the room rounded to the nearest cubic foot

*April 7, 2014*

**Chemistry**

How would you start and finish these questions by a step by step process? Does Amp equal to Joules? 1. How many grams of aluminum can be produced by the electrolysis of aqueous aluminum chloride by a current of 5.00 amps for 5.00 hours? 2. Consider the following ...

*April 6, 2014*

**math**

Jorge sees that there are small and large squares in the tile design belo.how many squares are there in all in the design?

*March 20, 2014*

**science**

- Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...

*February 27, 2014*

**Geology**

Pleistocene mammoth bone from La Brea Tar Pits of Los Angeles, California. Age: 12,200 ± 35 years

*December 10, 2013*

**Biology 20**

I'm using chromatography to identify compounds in a leaf extract for a lab, and one of the evaluation questions is 'Suggest a step that could be added to the procedure to isolate a specific compound for chemical testing.' What step could I use?

*October 30, 2013*