Friday
July 11, 2014

Posts by Ana


Total # Posts: 966

AP Chemistry
How do I calculate orbital hybridization?

PHYSIC
An airplane flies north at a speed of 150 km/h relative to the air through which it flies. If there is a tail wind of 50 km/h, what is the plane's velocity relative to the ground?

PHYSIC
If a blue car drives 10km/h across the deck of an ocean liner that is traveling at 90km/h, what is the blue car's speed relative to the surface of the water when it drives toward the front of the ocean liner?

6th grade social studies
unscramble artiotinm

chemistry
urgent help needed!!! what is .0966 rounded to 2 significant digits? and why?

science
we have done experiment in school and for homework we must write chemical reactions that have happend during the experiment. the experiment was like this : first we took an unknown substance than we have put some CuO , we mixed that two substances together in test tube. Than w...

chemistry
this is over significant digits. -Indicate how many significant figures are in each of the following measurements: e) 4.0 X 10-5 kg i got 1 significant digit, but i'm not sure it if it's right... (& i can't ask my teacher, the situation is complicated)

science
thanks a lot -.- i can use search engine too -.-"

science
we have done experiment in school and for homework we must write chemical reactions that have happend during the experiment. the experiment was like this : first we took an unknown substance than we have put some CuO , we mixed that two substances together in test tube. Than ...

calculus
What is the answer?

science
we have done experiment in school and for homework we must write chemical reactions that have happend during the experiment. the experiment was like this : first we took an unknown substance than we have put some CuO , we mixed that two substances together in test tube. Than w...

english
what were the two images paine uses in the first 10 lines of the crisis. what kinds of poeple does paine identify thes images? why are these images appropriate

Chemistry
Thank you so much for your help.

Chemistry
So the water molecules fit in between the alcohol molecules? or do they attach to the structures?

Chemistry
So the water molecules fit in between the alcohol molecules? or do they attach to the structures?

Chemistry
Water is a small molecule consisting of 3 atoms joined together. (they give the structure of H20. Alcohol is a large molecule consisting of 9 atoms joined together. (they give alcohol structure) using this information make a hypothesis that explains the decreased volumes found...

history
It was basically so they could check the power. No one group would have total control. The Congress can't pass laws without going through the president, and the president can't pass laws without passing it through Congress. The same goes for the Judicial branch except ...

Chemistry
I thought so too. I was right. :)

Chemistry
Assume you have a 50 L barrel full of basketballs and a 50 barrel of tennis balls. If you dump both barrels full of balls into a 100 L barrel, will the barrel be full?

..
ooh and why?

..
which variable is the dependent variable?

10th grade math
how do i solve for y in the equation -5y(6y - 6) - y = -4(y - 5)

suffixes
answer the question with a complete sentence that uses a word from the spelling list. add a sufix to the underline word to create the correct word. Does Herb resemble his brother? the word from the spelling list is "rehearsal"

algebra
-2 2/3 ÷3 ? 5(-2.4) multiply or divide.then compare using <,>,=

algebra 8
oww ...so its < cazz i'm kind of confusee about this two <>

algebra 8
mm is it > ??

algebra 8
multiply or divide. Then compare using <,>, or = 10(-1/2) ? 20÷4 can some on do it 4 me please

science
ohh thanks

science
i mean inertia

science
what does intertia means?

Math
How many seven-digit numbers less than 1,048,000 can be made using the digits 0,1,4,6,7,8, and 9? Make a list of possible ways to represent your seven-digit numbers.

algebra 8
A. 1165 B.920 its that the answer?

algebra 8
please some one

algebra 8
business. A restaurant manager lost $415 in business during the month of january . business picked up in February, and he ended that month with a profit of $1580 A. What was the manager's profit after January and February? B. What if...? The restaurant lost $245 in busines...

algebra 8th
so whats the answer?

algebra 8th
it da answer - 19/40???

algebra 8th
i gat 16/40 and 35/40 so do i have to subtract 35-16?? or what???

algebra 8th
mm i guess

algebra 8th
now i dont understand this one Add Or SSubtract 2/5 - 7/8=?? what do i have to do?

algebra 8th
Thanks

algebra 8th
-4.7-(-4.7) = 0 ???

Spanish
k es lo k tratas d preguntar?

science
the Nucleus controls the whole cell. It's known as the "brain".

algebra check
because it would be the same answer and the smart one that i asked said that it was right..da!!

algebra check
o really o woow thanks

algebra check
its it right or wrong???

algebra check
add or subtract, -8-3 -8-3= -8+(-3) 3+8= -11

social studies
ohh i know!!!=) ama 8th grader xd

algebra
its diamond problem ok

algebra
i dont know how to do this 1/2> on the top is??? on the right 1/2 on the butttomm?????

Spanish
oww ok ama stu;;;;id

Spanish
mm no entiendo.. k kieres decir??

vocabulary
mm i dont know

vocabulary
whats the meaning of ..The more i stretch and exercise, the more flexible my joints become....i need the context clue..please

Chemistry
A solid white substance A is heated strongly in the absence of air. It decomposes to form a new white substance B and a gas C. The gas has exactly the same properties as the product obtained when carbon is burned in an excess of oxygen. Based on these observations, can we dete...

chemistry ?
If fire is exposed to pure oxygen the reaction for fire would occur more dramatically (like a burst of flames).

chemistry
0.46 mol NH4NO3 * 1 mol N2O/1 mol NH4NO3 = 0.46 mol N2O 0.46 mol N2O * 43.99 g N2O/1 mol N2O = 20.24 g N2O

algebra
4x+4y=7 4(0)+4y=7 0+4y=7 4y=7 now divide to solve for y y=7/4 4x+4y=7 4x+4(0)=7 4x=7 now you divide for x x=7/4

algebra
many pounds of each should be mixed together in order to get 240-lb mixture that is 7% portein how many pounds of the cornmeal should be in the mixture? How many pounds of the soybean meal sould be in the mixture?

Chemistry
If your sample contained a volatitle impurity, what value would be in error, the weight of the anhydrous salt or the weight of the water? Please explain. Thank you

Chemistry
Write formulas for the following compounds containing complex anions. rubidium hyponitrite magnesium bromite

Chemistry
What is the name of the following compounds; Hg2(BrO2)2 Au(OCN)3 AuSCN Ni3(AsO4)2 Thank you

Physics Check
An airplane flies north at a speed of 150 km/h relative to the air through which it flies. If there is a tail wind of 50 km/h, what is the plane's velocity relative to the ground?

Physics Check
A motorboat travels at a speed of 40 km/h relative to the surface of the water. If it travels upstream against a current of 12 km/h what is the boats speed relative to the shore?

algerba
simplify the expression -10xy - 15y / 5y -10xy -3y^2 is my answer rigth or wrong

algerba
which is the simplest form of the radical expression sqrt (10)+6sqrt(10)+-3sqrt(10)

Math (Algebra)
divide the numerator by 4. Divide the denominator by 4.

Algebra 2
it's fine i already figured it out. thank you for your help. :)

Algebra 2
How do I solve this radical equation? 3 + (2x√3) = 5

math
slope= 2x y-intercept= -5

Algebra 2
What would the expression x^-6/11 be simplified?

Chemistry
I did your other one.

Chemistry
13.6 g Hg/cm^3 * 10 cm^3 The cm^3 cancels out and you get 136 g Hg. 136 g Hg * 200.59 g Hg/ 1 mol Hg = 0.68 mol Hg. 0.68 mol Hg * 6.02*10^23 atoms Hg/ 1 mol Hg= 4.08*10^23 atoms Hg

Chemistry
19.3 g/1 cm^3 * 1 lb/453.59 g =0.043 lb/cm^3 The grams cancel out. 0.043 lb/cm^3 * 28317.02 cm^3/ft^3=1217.63 lb/ft^3 1217.63 lb/ft^3 = 1.21 lb/ft^3

Algebra 1
In a 30-60-90 triangle, if they give me b=15, what would be a & c?

Geometry
I have a 45-45 special right triangle who's hypotenuse is 12, how do I find the other two side lengths?

Algebra 1
What's the answer to [(x-2)(x+2)/x(8x+3)]*[2(8x+3)/(x-2)] is it 2x+4/x or 6?

Algebra 1
what's the LCM of: 2r-1 , r+4

Algebra 1
Is this correct? (3m^2/2n )* (n^2/12) = m^2*n/8

Algebra 1
Is this correct? (3m^2/2n )* (n^2/12) = m^2*n/8

chemistry
calculate the molarity of each of the following solution: 2.00 mol glucose in 4.00 L solution.

chemistry
why is C4H10 the simplest alkane that can have structural isomers?

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

chemistry
calculate the molarity of each of the following solution: 2.00 mol glucose in 4.00 L solution.

chemistry
which of the following molecules can have optical isomers? a. CH2Cl2 b. H2NCH(CH3)COOH c. ClCH(OH)CH2Cl is b and c

chemistry
CH3-CH=CH2-CH2-CH2-CH3 CH3

chemistry
draw the structural formula of 2-methyl-2hexene?

chemistry
why does 2-butene have cis and trans isomers but 1-butene doesn't?

chemistry
why is C4H10 the simplest alkane that can have structural isomers?

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)-2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

chemistry
carbon disulfide and carbon monoxide are produced when carbon is heated with sulfur dioxide. 5C(s)+2SO2(g)-CS2(I)+4CO(g) a. how many moles of C are needed to react with o.500 mol SO2? 0.500mol SO2 x5C/2SO2=1.25C

chemistry
would you tell me please are the answers corect?

chemistry
determine the correct answers to the calculation shown below to the correct number of significant figures? a. (32.453)(34.23+1.17)/(2.26-1.811)(0.00378)=9.671716784=9.7 b. (3.23+0.0018)=3.2318=3.2 c. (82.97-0.012)/(1.100)(21.9)=1651.618364

chemistry
determine the correct answers to the calculation shown below to the correct number of significant figures? a. (32.453)(34.23+1.17)/(2.26-1.811)(0.00378)=9.671716784=9.7 b. (3.23+0.0018)=3.2318=3.2 c. (82.97-0.012)/(1.100)(21.9)=1651.618364

chemistry
what is the explanation of 0.01M acetic acid ?

chemistry
what is the explanation of the pure acetic acid?

chemistry
if one can find the ratio of the number of moles of the elements in a compound to one another, one can find the formula of the compound. in certain compound of copper and oxygen, Cux Oy, we find that a sample weighing 0.5424g contains 0.4831g Cu. a. How many moles of Cu are in...

chemistry
how much 0.150 M sodium hydroxide would be required to just neutralize 15 ml of 0.175 M hydrochloric acid?

chemistry
If all the students placed their "unused" standard sodium hydroxide back into the original container what would be the likely effect on the next class?

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