# Posts by sienna

Total # Posts: 37

1. ### Math

A car travels 300 miles on 15 gallons of gas
2. ### math

cos(arcsin(x)+arctan(x))

C A D C
4. ### Chemistry

How many moles of nitric oxide are formed from 0.60 mole of nitrogen dioxide
5. ### language arts

CADCC is correct. Just took it and got them right.
6. ### math

so 6times10 equals 60 so then you would add 60 times 10 which you have to figure it out then you bot the answer.
7. ### science

ttgh yh6yb gbg tgb trvgr rr
8. ### Chemistry

In the reaction between bromine and sodium, a bromine atom gains an electron. What ion is formed? Is the bromine oxidized, or is it reduced?
9. ### look adverb and verbs

The farmers need to water them every day is this correct answer water every day
10. ### english

what is a concrete noun

Bill
12. ### math

You do 7times3 which equals 21 and then do 20times7 equals 140 so you would do one block of 100 then put 21 by each group of 10 which should equal 100 then there you go;)

15
14. ### S.S

How do I write a one page essay on 'If I were a settler, where would I settle and what would my surroundings be?'
15. ### Accounting

The annual interest rate for a customer’s loan of \$675 is 19.25%. What is the total dollar amount to be repaid on the loan, including principle and interest, for the entire year?
16. ### Calculus

Write a slope field for the differential equation. Corporate administrators notice that 13% of their employees retire each year, while 2,500 are newly hired. What is the long term effect if they initially have 30,000 employees?
17. ### Math

A shopkeeper packages together two types of hard candy: peppermint and cinnamon. Separately the peppermint candy sell for \$1.80/kg and the cinnamon candy sells for \$2.40/kg. The mixture sells for \$2.16/kg. Determine the amount of each type of candy that is required to make ...
18. ### math word problem

A rectangular bathtub with a base of 18 ft^2 is filling with water at a rate of ..7ft^3 per minute. How fast is the water level rising after 3 minutes?
19. ### pre calc - polynomials & factoring

perform the opertaion and write the result in standard form... (2x^2 + 1) - (x^2 - 2x + 1)

100 grams
21. ### heat of solution

the heat formation of NH3 is -11.04 Kcal/mole. HOW would you calculate the heat of formation of NH3 in Kj/mole?
22. ### molar heat

the molar heat of vaporization for water is 40.79 kJ/mol. How would you express this heat of vaporization in joules per gram.
23. ### chemm

A car air bag requires 70. L of nitrogen gas to inflate properly. The following equation represents the production of nitrogen gas: 2NAN subscript 3 yielding 2NA + 3N subscript 2 the density of nitrogen gas is typically 1.16 g/L at room temperature. How would you calculate the...
24. ### CHEM

given the general chemical equation, A yields 3C + D , a. how many moles of C can be produced from one mole of A? b. how many moles of D can be produced from four moles of A?
25. ### chem

if the reaction type is Synthesis then what would be the product of.. Fe subscript 2 O subscript 3 + H subscript 2 O
26. ### CHEM_

if 16.5 of iron (II) sulfide contain 6.02 x 10^23 formula units, how many formula units of iron (II) sulfide are in 1.00 mL of iron (II) sulfide? The density of iron (II) sulfide is 4.84 g/cm^3
27. ### CHEM

how many gram of potassium bromide can be made from 13.7 grams of potassium and unlimited bromide
28. ### chemistry

how to write the oxidation number for CL4
29. ### chemistry

what is the smallest fraction of a milliliter to which you can make a measurement
30. ### chemistry

how would the electrons produced in a cathode ray tube filled with neon gas compare with the electrons produced in a cathode ray tube filled with chlorine gas?

what is a boundary between two air masses called
32. ### phys.

suppose your local electric company charges \$0.0650/kWxh for the first 200.0 kWxh, and then drastically raises the price for every kilowatt-hour more. What is the maximum you family would pay if they wanted to pay only the cheaper rate?
33. ### phys.

a computer with a power input of 230.0 W (watts) has a resistance of 91.0 Ohms . how do you find the current in the computer?
34. ### algebra

What is -17p + 12p - 11p
35. ### thermochemistry

what is the enthalpy change in kilojoules for the combustion of 1 mol of ethanol, C2H5OH (l), to form gaseous carbon dioxide and gaseous water? use bond energies to calculate your answer. (hint: there is a double bond in carbon dioxide and oxygen) the answer is supposed to be...
36. ### Predicting products for electrolysis

when you have your 4 different equations to form 4 different possible equations, what two equations do you use for water, O2(aq) + 4H+ + 4e- ----> 2H20 (+1.23) 02 (g) + 2H2O (l) + 4e- ----> 4OH- (+0.40) 2H20 (l) + 2e- ---> h2 (g) + 2OH- (aq) (-0.83) I'm not quite ...
37. ### Electrochemistry

Hi, I'm in my final year of high school doing an electrochemistry unit and there is a concept I just don't really get. I would appreciate all helps please-- Redox reaction half reactions are: Oxidation: Zn(s) --> Zn 2+ (aq) + 2e- Reduction: Cu2+ (aq) + 2e- ---> ...