chels

Most popular questions and responses by chels
1. Chemistry

A solution has a pH of 3.90. What is the hydroxide ion concentration? I know that I need to find H30+ first but my teacher doesn't allow calculators on the test. So how would I find the answer WITHOUT a calculator?

2. Physics

A 0.53-kg billiard ball initially at rest is given a speed of 12 m/s during a time interval of 4.0 ms. What average force acted on the ball during this time?

3. Chem

Which of the following solutions would require the greatest volume of 1.0M NaOH for complete neturalization? a)10.0ml of 1.0M HCl b) " of 2.0 M H2S04 c) " of 3.0M H3P04 d) " of 4.0M H2C204 I don't understand what to do to solve it.

4. Algebra 2

An ice-cream parlor sells sundaes with 3 different types of ice-cream and 4 different toppings. They have 8 flavors of ice-cream and 10 toppings for their customers to chose from.what is the probability that a customer orders a sundae including chocolate

5. math

Zared plays basketball on his high school team. One of the things he needs to practice is his free throws. On his first shot, there is a probability of 0.6 that he will make the basket. If he makes a basket, his confidence grows and the probability he

6. science

In the following equation , 417.96 g of Bi reacts completely with 200 g of F . How many grams of BIF (to the third power) are formed?

7. U.S History

Why were the Vietcong so successful against the United States? A.The Vietcong held the strategically important Ho Chi Minh Trail. B.U.S. troops could not engage the Vietcong in traditional warfare. C.Vietcong forces had superior weapons and military

8. math

you purchase a bicycle with a retail (pre-tax) price of \$760. the local sales tax rate is 7.6%. what is the final cost

9. Math

Two teams, the Exponents and the Radicals, square off in a best of 5 math hockey tournament. Once a team wins 3 games, the tournament is over. The schedule of the tournament (for home games) goes: E-R-E-R-E If the Exponents are playing at home, there is a

10. Algebra 2

I=2V/R+2r Solve for r.

11. Help

dissonance : resonace :: harh : rich music : polyphony polyphony : instrument cacophony : telepragh I presume you mean "harsh" not harh. So, to do an analogy, you really need to understand the meanings of all the words involved. Do you know what dissonance

12. accounting

Post-closing trial balance What am I supposed to do when the balance is not equal? As in credits do not match debits. I follow the instructions in the book but no matter what it just does not match, even if i do all the debits on one side and all the

13. statistics

The time that it takes a randomly selected job applicant to perform a certain task has a distribution that can be approximated by a normal distribution with a mean value of 120 sec and a standard deviation of 25 sec. The fastest 10% are to be given

14. Chem 219

If 48.9g of barium chloride dihydrate, BaCl2.2H20, was treated with excess silver nitrate solution. (show formula) a). how many moles of silver chloride precipitated? b). how many grams of silver chloride precipitated? thank you!

15. Algebra 2

half life carbon -14 is 5,730 years. If you start out 50 grams, how long will it take until it reaches 2 grams?

16. maths

San Jay is 2 years younger than Sara. Who is 5 years old than Sasha. San Jay age and Sasha s age total 31. How old is Sara?

17. Math Probability

We have looked at the probability that two non-mutually exclusive events A or B can happen in this learning experience. We will take it one step further and look at the probability that event A or B or C will happen. The formula is: P(A or B or C) = P(A) +

18. Algebra 2

two resistors are connected in parallel. Their resistances are 8 ohms and 17 ohms. What is the resistance (R) of the combination? R=---ohms

19. Tx. History

What was the American experience?

20. Physics

Pulling the string on a bow back with a force of 28.7 lb, an archer prepares to shoot an arrow. If the archer pulls in the center of the string, and the angle between the two halves is 138*, what is the tension in the string?

21. Physics???

When the air temperature is below 0 C, the water at the surface of a lake freezes to form a sheet of ice. If the upper surface of an ice sheet 24.2 cm thick is at -10.7 C and the bottom surface is at 0.00 C, calculate the time it will take to add 1.80 mm

22. health

the ability to gather, understand, and use health information to improve your health

23. Algebra 2

what is the opposite of 49x^2y A. 49x^-2y b. -49x^2y c. 1/49x^2y d. -49/x^2y

24. chemistry

What is the number of moles of NaOH in 1.91 mL of a 872.25 molar solution?

25. spanish

La cocina esta muy sucia. Tu padre dice estas lavando los platos lavan los platos lava los platos y saca la basura Estas sacando la basura

Find the measure of the reference angle for 400 degrees. How would I do this?

27. Algebra 2

I=2V/R+2r Solve for r. simplify

You wish to study a variant [a close relative] of the Tobacco Mosaic virus. Specifically you want to characterize the capsid and genetic component as well as determine the viral load required to cause a disease state. a. What methodologies might you use to

29. Accounting

A deposit of \$1,250 that was incorrectly in the checkbook as 1,200 should be a. added to the checkbook b. deducted from the cheeckbook c. added to the bank statement balance d. deducted from the bank statement balance ok so I know for sure its not c or d

30. Trigonometry

Which Triangle has 2 solutions? a. A=130 degrees, a=19, b=11 b. A=45 degrees, a= 4(sqrt 2) b=8 c. A=32 degrees, a=16, b= 21 d. A=90 degrees, a=25, b=15 I really don't know how to do this one so I can't put what my answer is.

31. math

I have fewer ones than tens. The value of my tens is 20. What two numbers can I be?

32. Algebra 2

Use the associative property of multiplication to write an expression equivalent to 8x*(4y*7z)

33. Economics

A buyer is usually not willing to spend a lot of time and energy researching the market when: c. savings to be made are small or d. prices vary but quality is still the same I read the text but I couldn't really find this exactly, both answers seem like

How do you graph y>= sqrt(3x+12) Show how to get certain points.

35. Algebra 2(graphing)

Solve 2x^2=3x+2 by graphing. If exact roots can't be found, state the consecutive integers between which the roots are located. Can you show how to do this step by step?

Use the value of the discriminant to determine the number and type of roots for the equation: (x^2+20=12x-16) 1 real, irrational 2 real, rational no real 1 real, rational

37. algebra 1

v(v-3)= v^2+6 Does any one know if this is in the quadratic form or not The v^2 means v second power No it is not. Please read: http://www.wtamu.edu/academic/anns/mps/math/mathlab/col_algebra/col_alg_tut20_quadform.htm

38. Algebra 2

A company can produce T-shirts for \$0.99 each. They spent \$1,000,000 on their building and machines. What is the horizontal asymptotes of the graph that models the average cost of each t shirt, including the start up cost?

39. Algebra 2

I=nE/R+nr Solve for R. Simplify

40. chemistry

What is the number of grams of KCIO3 to make 750 mL of 0.227 M?

41. Math

My qestion is how do you find out how many degrees of latitude separtae each other. For example How many degrees of latitude separate (45N, 65W) and (32S, 65W)? Thanks for your help

You wish to study a variant [a close relative] of the Tobacco Mosaic virus. Specifically you want to characterize the capsid and genetic component as well as determine the viral load required to cause a disease state. a. What methodologies might you use to

43. chemistry

what happens when you place sodium hydroxide and water into a calorimeter?

44. science

what are all of the formulas for physical science?

45. Pre-calc

Simplify i^51 Im really not sure what they are saying. i to the 51ith power? Wouldnt it already be simplfied or what. It doesnt make sense to me.

46. Physics

Doubling the amplitude of a wave will double the amount of energy the wave can transfer. true or false Is it true? That's what I think but I am not that good at this sort of thing.

47. philosophy

Beautiful harmony comes from things that are in opposition to one another [Heraclitus ok i need to write my personal philosophy and i cant think of any examples of this quote for my body pargraphs...except velcrow..i don't think that a good one thought

D, D, B. Got a 100%

posted on December 19, 2018
2. algebra graphing

It’s for halving fun

posted on April 13, 2018
3. math

A ) 10*6 = 60 10*6= 60 60+60 = 120 20 heaps

posted on November 29, 2016
4. Chem

A 4.369 g sample of metal is placed in a flask. Water is added to the flask and the total volume in the flask is read to be 126.4 mL. The mass of the water, flask, and metal is 268.5 g. If the mass of the flask is 139.3 g and the density of water is 1.000

posted on August 31, 2016
5. math

No, for the tree I start with a branch of 0.6 and 0.4 and from there branch off to .35,.45,.55, and .65?

posted on February 20, 2016
6. Chemistry

37.5ml 1L .152 mol NaCr 1 mol AgNO3 -------|-------|-------------|-------- 10^3ml 1L 1 mol Na2cr 1 L 25ml -------------|-------- 1 mole AgNo3 10^3ml

posted on November 15, 2012
7. Algebra 2

I tried that already, it didn't work.

posted on May 24, 2012
8. chemistry

Ni with +2 electron

posted on February 9, 2011
9. Chem 219

thank you for your response, I think I can solve the stoichiometry, the main issue for me is trying to set up the formula. do you think could help me try to set up the formula? the components confuse me.

posted on February 9, 2011
10. Chemistry

Molar Mass of KCLO3 (potassium chlorate)= 39.10+35.45+3(16.00)=122.55 First use what you are given, then use the mole to mole ratio to cancel out moles KClO3 and multiply keeping mol O2. (12.00 moles KClO3)x(3 mol O2/2 mol KClO3) =18 moles O2 :D

posted on February 9, 2011
11. Chem

So would the answer be c because it has 3 times the H+?

posted on December 15, 2010
12. Tx. History

I know like the Americas/us wanted to take over the Mexians territory which was Texas or something like rhat.

posted on November 18, 2010
13. Tx. History

For the Mexicans and The us. Around early 1800s in Texas

posted on November 18, 2010
14. spanish

No I know what it says but the first is the question and the others are the answer choices. They didn't seem to make sense to me, like none of them were right

posted on May 20, 2008
15. Accounting

Yeah I know that's why Im confused.....I know how to use and balance a checkbook but these are the only choices they gave me.

posted on February 13, 2008
16. accounting

This is what my book says The first step in closing is to transfer the balance of the revenue account to Income summary, the balance is found in the Income Statement section of the work sheet Then to record into the general journal 1. Enter "closing

posted on February 13, 2008