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Posts by Nancy

Total # Posts: 805

Chemistry
2Na + 2H2O → H2 + 2NaOH is the balanced equation. from that, .113 mole/2=.0565 x -368 = -20.79kj or 20.79 kj heat is created in the reaction.

chemistry
Yes this does help! Thanks!

chemistry
A 1.50 liter gas sample at 745mm HG and 25 celsius contains 3.55% radon by volume radon-220 is an alpha emitter with a half life of 55.6 seconds. how many alpha particles are emitted in 5 minutes by this sample? I got an answer 1.59x10^19 I started at 745/760=.980263 then ....

Chemistry
X-rays have a wavelength in the range of 0.01 to 10 nanometers.. That would be a wavelength of up to 10 billions of a meter

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 the toppings of whipped cream, ...

math
To turn a %number into a decimal just move the decimal over two spots from the whole number. So, for example 100% would be 1, or 33 1/3 would be .33333 which is 1/3 of 100%. The 1/3 part turns into .33 because 1/3 of a dollar is 0.33 cents. another example would be 25% is 0.25...

chemistry
Thank you Dr.Bob for your speedy reply-I also tutor in other subjects, but chem. is my nemesis.

English
"Spielberg's ability to communicate visually in the media of film is no doubt matched by his versatility as a public speaker." take it from there. giving examples of the oral topics he might cover as expressed already in his incredibly varied kinds of films, from...

English 2 Animal Farm
He simply represents a worldly point of view rooted in negativism based on experience (vs. the Intellect, the Evil, the populist)

chemistry
How many joules to vaporize 1.5 L of H2O at 19 degrees Celsius?

English
Note the individual words that have common associations:stagger, fall. note the repetition of vowel sounds within the lines to strengthen the mood.note how short the lines and words are, to mimic the nature of the scenery--harsh, barren, ie., tough.

Biology
I think that you calculate algebraically: since 400% is quadruple, divide that by 5.5% to get the # of years

Algebra 2
a hyperbola is centered at (3,7). The vertices are (9,7) and (-3,7). The slopes of the aymptotes are m==/-5/6. Enter the equation of the hyperbola in the form: (x-h)^2/a^2-(y-k)^2/b^2=1

Algebra 2
Soo the equation is 25y^2-9x^2-200y-36x+139=0 and for the center is got (2,4) and the vertices I got (2,7) and (2,1) But i cant figure out how to find the slopes of the asymptotes and it wants the answer is reduced fraction please explain

Writing
My own opinion on this issue is that it is past time for the government to take some responsibility in legislating the food products/garbage that is so heavily marketed through advertising--the detrimental effects of eating junk foods that lead to cancer, heart disease, ...

chemistry
I think that the base always contains hydroxide, aka OH; the original components were water mixed with an ammonium compound ( NH2)Check the chemistry reference tables too, which have tables that identify the bases and acids.

poems
Sammy sold seashells by the shoreline on oysters and mussels he did dine when the tide rolled in he went for a swim and forgot about selling those seashells

Algebra 2
A package with square ends has combined length and girth(girth is perimeter of a cross section) of 120 in. The surface area of the entire package is 3600 sq. in. Determine the dimensions of the package. s in. * s in.* l in. One solution is: 11.08in. * 11.08in. * 75.68in. Find ...

Math
a cylinder has a radius of r and a height of h. A rectangular box has a length of r, a width of h and height of h. Their combined volume is V=πr^2h+h^2r If their combined volume is 600 cubic inches and h is 5 inches, solve for the radius(r).

Math
the formula for the surface area of a cylinder is: A=2πrh+2πr^2 If the height of the cylinder is 10 inches, and the surface area is 200 sq. inches, determine the length of the radius

Algebra
The formula for the volume of a cylinder is: V=πr^2*h If the volume is 432 cubic inches and the height is 8 inches, solve for the length of the radius.

algebra2
If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft, t is in seconds and v is in ft/sec) Solve for t when the object hits the ground. (when h=0) t...

Algebra 2
If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s (where h and s are in ft, t is in seconds and v is in ft/sec) If a rock is dropped from the top of a 200 ft building, ...

Algebra 2
A rectangular piece of cardboard has length that is 16 inches more than the width. The area of the cardboard is 297 sq. in. Find the measures of its width and length. Enter width in., length in.

Algebra 2
A farmer has 120 ft. of fencing available to enclose 2 adjacent rectangular pens alongside his barn. NO fencing is required along the bard side. He needs to have a total of 930 sq.ft. Determine the width (x) and the combined length of the pens. There are two solutions. One is ...

Algebra 2
√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma

Algebra 2
x= √3x+12+2

Algebra 2
√3x-4=2√x-5 Solve this equation, if there is more then one answer separate with a comma

Algebra 2
Solve this equation: √4x+8=6 If there is more then one solution enter with a comma

algebra2
evaluate without using a calculator 216 2/3

Algebra 2
SIMPLIFY: 3√(63x^5/(72y^6)) Example to enter answer: n√b, enter (b)^(1/n) Example: For 4√3:2, enter 4(2)^(1/3).What is my answer and how do i answer it?

Pharmacology
3/100

algebra2
How do i enter my answer? so the question is Simplify: √3:(63x^5/(72y^6)) and for my answer i got x√3:(7x^2/(2y^2)) but my work page says: Enter example: For 4√3:(2), enter 4(2)^(1/3) so how do i enter my answer

math
at a store you bought 2 pounds of apples and 1 1/3 pounds of grapes. If the store's scale measures to the nearest half pound, what is the range of possible actual weights for the sum of both purchases of fruits.

how do i enter my answer
√4:(32x^11y^15)/√4:(2x^3y^-2) for this equation i got =2x^2y^4√4:y and in my worksheet it says enter it: √b, enter sqrt(b). For example: For 4√3 enter 4sqrt(3) so how would i enter my answer

Algebra 2
√(21x^2y/(75xy^5) it says on my paper to enter it: √b, enter sqrt(b). For example: For 4√3 enter 4sqrt(3) Please help, I've got 5 wrong! :(

Algebra 2
An airplane flies 1050 km with the wind. In the same amount of time, it can fly 750 km against the wind. The speed of the plane in the still air is 200 km/h. Find the speed of the wind.

Algebra 2
Name this polynomial by its number of terms and degree.? √29x^6

Algebra 2
which property justifies this statement q+(r+s)=(q+r)+s a. communicative property of addition B. distributive property C. Associative property of addition D. identity property

Algebra 2
240,000,000x 0.000024/0.005 simplify and convert to scientific notation

Algebra 2
Evaluate the expression. 10x^3y^-5z^-2 if x=3, y=2, z=5

Algebra 2
which of the following are not polynomials? A. x^4+ πx^3+√2x B. 3x+x^4 C. 4x^3+2x^2+ √x D. 2x^3/5-x/3+π E.x/4-5/x+10

Algebra 2
The sum of two numbers is 100. One number is four more than three time the other number. What are the last numbers?

Algebra 2
Find (gº f)(-4) f(x)=-x^2+4 g(x)=2x

Algebra 2
Find the slope of the line containing these points. (1/8, 1/4) and (3/4, 1/2)

Chemistry
Why does equilibrium shift to the left when AgNO3 is added to the equation Co(H20)6 (aq) + 4Cl- (aq) <---> CoCl4 (aq) + 6H2o(l)?

statistic
The amount of time a bank teller spends with each customer has a population mean of 3.10 minutes and standard deviation of 0.40 minute. If a random sample of 16 customers is selected, a) what assumption must be made in order to solve parts (b) and (c)? b) what is the ...

statistic
The Tite Wire Company manufactures wires for circus acts. It has taken a random sample of 100 pieces of wire and wants to see if the thickness of a batch of wire meets minimum specifications. Assume that the population mean is 0.45 inch, with a standard deviation of 0.03 inch...

statistic
The distribution of cash withdrawals from the automatic teller machine at a certain bank has a mean of $500 with a standard deviation of $70. To reduce the incentives for robbery, the bank puts money into the machine every 12 hours and it keeps the amount deposited fairly ...

statistic
If 55% of a television viewing population watched a program called ¡§Name that Poem¡¨ one evening, what is the probability that, in a random sample of 100 viewers, less than 50% of the sample watched the program?

algebra2
Solve this formula for m. simplify your answer. S=H/m(a-b)

Algebra 2
two resistors are connected in parallel. Their resistances are 6 ohms and 10 ohms. What is the resistance, (R), of the combination? R=-----ohms?

Algebra 2
A resistor has a resistance of 15 ohms. What size of resistor, (r2), should be connected in parallel with it to obtain a resistance of 7 ohms. Use 1/R=1/r1+1/r2. r2= ohms?

Algebra 2
Solve this formula for r. Simplify your answer. E/d=R+t/r Make sure you use parenthesis around any polynomials in the numerator and or denominator.

Math
a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river? mi/hr?

Chemistry
How do I write the skeleton equation then balance the following (step by step): hydrogen+bromine---> hydrogen bromide

statistic homework
If 55% of a television viewing population watched a program called ¡§Name that Poem¡¨ one evening, what is the probability that, in a random sample of 100 viewers, less than 50% of the sample watched the program?

statistic solution
The distribution of cash withdrawals from the automatic teller machine at a certain bank has a mean of $500 with a standard deviation of $70. To reduce the incentives for robbery, the bank puts money into the machine every 12 hours and it keeps the amount deposited fairly ...

statistic
The Tite Wire Company manufactures wires for circus acts. It has taken a random sample of 100 pieces of wire and wants to see if the thickness of a batch of wire meets minimum specifications. Assume that the population mean is 0.45 inch, with a standard deviation of 0.03 inch...

Algebra 2
(4x^3-3x^2+7x)/(x+1/2) Quotient and remainder

Algebra 2
(3x^4-5x^3+7)/(x+1)

Algebra 2
(3x^3+4x^2-7x+6) / (x-3) quotient and remainder

International Finance
What is an AA curve?

Algebra 2
(2x^3-x^2-48x+15)/(x-5) Divide and find the quotient and remainder?

Algebra 2
(4x^3-4x^2-x-3)divided by(2x^2-3)

Algebra 2
(4x^4-4x^2-x-3)divided by(2x^2-3) quotient an remainder?

Algebra 2
(3x^4-2x^3+4x-5) divided by (x^2+4) quotient and remainder

Algebra 2
(4-3/x^4)/(5+2/x3) Simpify, Leave in factored and reduced form.

Algebra 2
(5+3/x^2y)/(3+x/x^3y) Simplify. Leave in factored and reduced form. Put () around polynomials in numerator and denominator

algebra2
(4/y^2-1/y^3)/(2/y+3/y^2) Simplify. Leave answers in factored and reduced form. Put () around the polynomials on numerator and denominator.

Algebra 2
x^2/x^2+3x-10 - 1/x^2+8x+15 Simplify Leave in factored form and put () around polynomials

Algebra 2
(5y+5)/(y^2^+7y+6)*(y^2^+4y-12)/(y^2^+3y-10) Simplify Leave answer in factored form. Keep () around binomial factors.

CHEMISTRY
HOW MUCH 1 MOLE HCL IS REQUIRED TO MAKE 250ML OF 0.1 MOLE HCL?

Sociological
Using the sociological perspectives: functionalism, conflict, symbolic interactionism and feminism, show how Facebook has made an impact on today's technologically-advanced society.

Math
a chemist has an 18% acid solution and a 36% acid solution. How many liters of each of these solutions should be mixed together to make 24L of 30% solution? Enter two numbers separated by a comma

AJ
How do the three subsytems :law enforcement, cout, and corrections interact with each other? sorry for misspelling

AJ
How do the three susytems law enforcemnt, cout, and corrections interact with each other?

math
A board is divided into rectangles each 2/15 in long What is the length of one rectangle written as a decimal

Biology
how do animals that live in different enviroments meet their need for efficent gas exhcange? I was thinking maybe through their respiratory system? Body surface, lungs , gills, any specialized organs ? Or though the environment they live in ?

books
i couldn't find the answer can u give me the answers pleaseeeee i'm totally lost

books
what does winston thinks about people who are arrested from history? 2)who did winston see in the hallway? 3)what kind of notes does O'Brien gives to winston

books
what does it mean war is peace from the novel 1984?

U.S History
THanks

U.S History
help please What challenges did the United States face after the overthrow of saddam Hussein? Please help me ASAP thank you

Chemistry
A chemist ran the reaction and obtained 5.70 of ethyl butyrate. What was the percent yield? How do I solve this problem?

4th grade math
Is 1,725+346 more or less than 2,000? Explain how you can tell without actually adding.

4th grade
Explain how you would use front-end estimation to subtract 189 from 643.

Chemistry
Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? A) 3 B) 4 C) 2 D) 6 E) 5

math
there are 7 red balloons and 4 fewer blue ballons. use cube trains to model the set of ballons.

algebra
During the first part of a trip, a canoeist travels 69 miles at a certain speed. The canoeist travels 2 miles on the second part of the trip at a speed 5 mph slower. The total time for the trip is 3 hrs. What was the speed on each part of the trip?

english
What is the def. Of the word thing-a-ling how how to put it into a sentence. Can not find in dictionary.

chemistry
0.386M

chemistry
Calculate the volume of 1.60 in milliliters that contains 6.00 of solute.

Algebra, Geo and Measurement
The diagonal of a tv screen is 21 in. The television's diagonal forms angle "m", which measures 50 degrees. What is the height of the screen?

Math
a) f(x) = 4.1x +92.16 b) f(x) = 17.9x + 19.36 c) f(x) = 8.8x + 55.4 ANSWERS: a) 4.8 b) 0.93 c) 2.2, i just have no clue how they got these answers EXTRA INFO: The demand function for a new product is p(x)= - 4x +42.5, where x is the quantity sold in thousands and p is the ...

Math
a) f(x) = 4.1x +92.16 b) f(x) = 17.9x + 19.36 c) f(x) = 8.8x + 55.4 ANSWERS: a) 4.8 b) 0.93 c) 2.2, i just have no clue how they got these answers EXTRA INFO: The demand function for a new product is p(x)= - 4x +42.5, where x is the quantity sold in thousands and p is the ...

math
arrays and an expanded algorithm 23*17

Math
Kosuke wrote a mathematics contest consistingof 25 multiple choice questions, the scoring system gave 6 points for a correct answer, 2 points for not answering, and 1 point for an incorrect answer.Kosuke got x correct and left y unanswered questions a) write an expression for ...

Psychology
I have to examine at least two mental disorders and two mental illnesses from the perspective of psychology. Do you know of any sites that can help me with this. Thank you.

social studies
I don't believe that punishment can be positive, using the usual definitions. Do you mean reinforcement?

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