Saturday

April 19, 2014

April 19, 2014

Total # Posts: 74

**Biochem**

You have prepared a 400 mL of a .210 M acetate buffer solution with a pH of 4.44. 1. Determine the concentration of both the acetate and acetic acid in the solution. 2. If you made this solution using solid sodium acetate (MW = 136 g/mol) and liquid acetic acid (17.6 M, referr...

**Math**

the larger of the two numbers is 8 more than twice the smaller. The sum of the numbers is 10 less than three time the larger. Find the numbers

**math**

a ball tossed to a height of 4 meters rebounds 40% of its previous height. the total distance travelled by the ball by the time it comes to rest is?

**Chemistry**

Where do you substitute Kc into the expression?

**science**

what type of a drink did not floated or sank?

**maths**

solve 4x/3x+1 = 3?x+5

**poem**

i read this book named abduction and my home work is to write a poem about it but the problem is i dont know how to write poem ?

**physics**

a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.60 cm. Water is gradually poured into the open end of the left arm until the water begins to flow ...

**Physics**

a modified U-tube: the right arm is shorter than the left arm. The open end of the right arm is height d = 10.0 cm above the laboratory bench. The radius throughout the tube is 1.60 cm. Water is gradually poured into the open end of the left arm until the water begins to flow ...

**math**

p = 160/21~7.62

**physics**

An object is dropped onto the moon (gm = 5 ft/s2). How long does it take to fall from an elevation of 250 ft.?

**science**

Which would be most appropriate to measure the mass of my pet panda in? a. kilograms b. centigrams c. Gigagrams d. milligrams its kilograms??????

**9th grade**

Name the set(s) of numbers to which 1.68 belongs. a. rational numbers b. natural numbers, whole numbers, integers, rational numbers c. rational numbers, irrational numbers d. none of the above my answer a)rational numbers

**math**

Simplify the expression. 17 – 6 × 10 ¸ 2 + 12 a. 67 b. 59 c. –1 my answer -1 ?????

**science**

Evaluate the following expression when r = 2 and t = 5. (2r)^t - 2 a. 1022 b. 16 c. 64 d. 62

**science**

Evaluate the following expression when r = 2 and t = 5. (2r)t - 2 a. 1022 b. 16 c. 64 d. 62

**10th grade**

1,500 workers

**10th grade**

A computer manufacturer assembled 21,000 computers in October. For the month of November, they expect to double production. If a worker can assemble one computer per day, how many workers will be needed to complete the job in 28 days? a. 1,500 workers b. 750 workers c. 1,429 w...

**math**

It takes 28 minutes for a certain bacteria population to double. If there are 4,241,763 bacteria in this population at 1:00 p.m., which of the following is closest to the number of bacteria in millions at 4:30 pm on the same day?

**NSU**

The Omega pharmaceutical firm has five salespersons, whom the firm wants to assign to five sales regions. Given their various previous contacts, the salespersons are able to cover the regions in different amounts of time. The amount of time (days) required by each salesperson ...

**Probability**

1/2 Please tell me if this is correct

**Probability**

A number cube, numbered 1 through 6, is rolled once. What is the probability of rolling an even number that is not prime? 1/6 1/3 1/2 2/3

**math**

Please tell me if this is correct 1/2

**math**

7. A bag contains 2 red cubes, 3 blue cubes, and 5 green cubes. If a cube is removed and replaced in the bag and another is drawn, what is the probability that both are green? 1/4 3/8 2/5 1/2

**math**

Please tell me if this is correct 7/20

**Probability**

Help please

**Probability**

1/16 Please tell me if this is correct

**Algebra**

that will be 5 so you are saying that my answer is 5? I though that because it was positive my answers was going to be differents. For example I had x=-1 4x^3+8x-3x-2 and after doing all the problems my answer was 13, but the x was a negative one that was the reason I though t...

**Algebra**

that will be 5 so you are saying that my answer is 5? I though that because it was positive my answers was going to be differents. For example I had x=-1 4x^3+8x-3x-2 and after doing all the problems my answer was 13, but the x was a negative one that was the reason I though t...

**Algebra**

Please help me I have been trying to get the answer and for some reason is not coming up correct can someone please help. evaluate the polynomial for x=1 3x^2-4x+6

**Math**

Wpw, way to post Ross problems on here.

**Geometry**

Planes A and B are both perpendicular to line M. What is the relationship between planes A and B?

**algebra**

Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that t...

**algebra**

Hint: Pay attention to the units of measure. You may have to convert from feet to miles several times in this assignment. You can use 1 mile = 5,280 feet for your conversions. 1. Many people know that the weight of an object varies on different planets, but did you know that t...

**business**

would like to see an example of what the plan should look like to get me started.

**4th grade**

how would i put these words in sentences:(PLEASE HELP ME) THANK YOU! l. general 2. inaccurate 3. interpret 4. evidence 5. demonstrate 6. relevant I start my tutoring classes in two weeks. I have been reading much more which should help me.

**MATH**

I THINK a. 4,000 is the answer am I right

**MATH**

I THINK a. 4,000 is the answer am I right

**MATH**

hello- The question is round to the digit underlined Add or subtract? 7 is the underlined digit. 7,526-3,861. a. 4,000 b. 5,000 c. 3,000 d. not given

**MATH**

Find the word form 0.007 a. seven hundredths b. seven tenths c. seven thousand d. not given I selected a. seven hundredths

**math**

math ? FIND THE VALUE OF 5 - 35,791 a. five hundred b. five thousand c. five thousandths d. not given I selected - b. five thousand correct? or not?

**4th grade-MATH**

Are there any websites that will help me with my division?

**MATH**

I DESPERATELY NEED TO KNOW HOW TO READ A PLACE VALUE CHART DEALING WITH DECIMALS IF ANYONE CAN GIVE ME AN EXAMPLE??

**MATH**

I DESPERATELY NEED TO KNOW HOW TO READ A PLACE VALUE CHART DEALING WITH DECIMALS IF ANYONE CAN GIVE ME AN EXAMPLE??

**Math Quotations place value **

Good evening, I am not sure if Ross wrote the questions for homework correctly however, I am a little confused as to the difference in hundreds place value vs. hundreths place value is there such a place value as HUNDRETHS? Would HUNDRETHS APPLY TO DECIMAL PLACE VALUE? Thanks ...

**math**

thanks much!!!!

**math**

please, does anyone know of a site I can go to online to help my son with some simple practice division? THX!!!

**division**

how can I learn simple division

**physics**

The way I solved the first part of the question was: Vo=? d=7.18 m Vf = 7.80m/s a = 9.81m/s^2 So find the initial Vo velocity using: Vf^2 - Vo^2 = 2ad Then once you get Vo, use the same equation to find the d, when Vf = 0, that's when the height is maximal. Hope that helps...

**RS**

How do Christians help others?

**3rd grade**

Good evening ~ I have 2 questions. Kelsey was assigned math homework. He was given 8 word problems to solve. He estimated that it would take him 5 mins. to solve each problem (THAT WOULD TAKE 40 MINS. FOR KELSEY TO COMPLETE HIS MATH HOMEWORK) ? HOW TO WRITE A MULTIPLICATION SE...

**3rd grade**

Just would like to know if you have any suggestions on how I would help my son tell time better. He really struggles with this. Thankks!

**3rd grade**

thank you thank you thank you!!!

**3rd grade**

how do I write the time in three different ways for 3:50

**Math**

What do we call the nunmbers that cannot be arranged ito 2-row arrays

**science**

what is meant by an animal or plant being in the same species

**chemistry**

Calculate the solubility of calcium sulfate 0.010 mol/L calcium nitrate at SATP

**chemistry**

Calculate the pH of the following aqueous solutions: 1.00 mol/L sulfuric acid H+ = 1.00 M for the first ionization THe second one is guided by K2 K2 = (H+)(HSO4-)/(HSO4-) Plugging in K2 as follows: H+ = 1.00 + x SO4- = x HSO4= 1.00 - x Can someone please solve for x ?

**chemistry**

Strychnine, C21H22N2O2(aq) is a weak base but a powerful poison. Calculate teh pH of a 0.001 mol/L solution of strychnine. The Kb of strychnine is 1.0 x 10^-6 My work: I called Strychnine SN SN + HOH --> SNH+ + OH- Kb = (SNH+)(OH-)/(SN) (SNH+) = x (OH-) =x (SN) = 0.001-x Pl...

**chemistry**

Strychnine, C21H22N2O2(aq) is a weak base but a powerful poison. Calculate teh pH of a 0.001 mol/L solution of strychnine. The Kb of strychnine is 1.0 x 10^-6 My work: I called Strychnine SN SN + HOH --> SNH+ + OH- Kb = (SNH+)(OH-)/(SN) (SNH+) = x (OH-) =x (SN) = 0.001-x Pl...

**chemistry**

Please calculate the pH and [H+] of a 0.30 mol/L solution of butanoic acid,. The Ka of butanoic acid is 1.52 x 10^-5

**chemistry**

Wow , thanks you are a really excellent expert! :)

**chemistry**

I am still getting the wrong answer. YOu are positive this is the answer? Perhaps my computer system is wrong?

**chemistry**

0.003898-- this is H+? Ka = ( )(0.00398)/( ) What would be the concentration of C6H5COO- ?

**chemistry**

Thank you! I still have to read over it but for now I beleive I got the jist of it

**chemistry**

For the titration of 20.0 mL of 0.1500 mol/L NH3(aq) with 0.1500 mol/L HI(aq)(the titrant), calculate a) the pH before any HI(aq) is added b) the pH at the equivalence point

**chemistry**

In a titration, how many millilitres of 0.23 mol/L NaOH(aq) must be added to 11 mL of 0.18 mol/L HI(aq) to reach the equivalence point?

**chemistry**

To clean a clogged drain, 26 g of sodium hydroxide is added to water to make 150 mL of solution. What are the pH and pOH values for the solution?

**Year 12 can't do year 7 simple math-help**

i cant tell the difference .... i cant even do it and im in year 12

**Algebra**

3 x -x factor completely x to the third power -x

**English**

What is the theme of the Medusa myth?

**Chemistry**

I wanted to now what is the molecular geometry of SeBr4, because I believe is a trigonal bipyramid...but I am not sure...please help me.... I thought it was a see-saw shape. See http://www.stolaf.edu/depts/chemistry/mo/struc/explore.htm You can see SeF4, the shape of SeBr4 is ...

**Nature**

I am researching about why water is blue. I am wondering why is the water in the Caribbean bluer that that of the North Atlantic? Thank you for using the Jiskha Homework Help Forum. This is an interesting question and here are some sites to explain it: http://www.dartmouth.edu...

**making dot arrays**

odd numbers

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