# sienna

Newest questions posted by sienna
1. ## Math

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

cos(arcsin(x)+arctan(x))
3. ## Chemistry

How many moles of nitric oxide are formed from 0.60 mole of nitrogen dioxide
4. ## 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?
5. ## look adverb and verbs

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

what is a concrete noun
7. ## 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?'
8. ## Accounting

The annual interest rate for a customerâ€™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?
9. ## 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?
10. ## 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
11. ## 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?
12. ## pre calc - polynomials & factoring

perform the opertaion and write the result in standard form... (2x^2 + 1) - (x^2 - 2x + 1)
13. ## 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?
14. ## 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.
15. ## 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
16. ## 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?
17. ## chem

if the reaction type is Synthesis then what would be the product of.. Fe subscript 2 O subscript 3 + H subscript 2 O
18. ## 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
19. ## CHEM

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

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

what is the smallest fraction of a milliliter to which you can make a measurement
22. ## 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?
23. ## 6th grade science

what is a boundary between two air masses called
24. ## 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?
25. ## 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?
26. ## algebra

What is -17p + 12p - 11p
27. ## 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
28. ## 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
29. ## 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-