Wednesday
April 16, 2014

Posts by selina


Total # Posts: 51

Chemistry
I need to balance the equation of the reactants NaHCO3->CuCl2 please help me.

Chemistry 151
5) How many mL of 1M HCl is used to make the following dilutions? a) 100mL of 0.1M HCl = b) 250mL of 0.5M HCl= c) 10ml of 0.01M HCl= 36.64 is the molar mass of hcl do I divide that into ml?

Chemistry
Find the molarity of 0.02g of silver nitrate dissolved in 1kg of water

Chemistry
Thank you very much for your time on this and the other problems I posted. You are appreciated. Selina Olomua

Chemistry
2) Given the balanced reaction equation predict the moles of each product given the following reactants: AlCl3 + 3 NaHCO3 Al(OH)3 + 3 NaCl + 3 CO2 AlCl3 NaHCO3 Al(OH)3 NaCl 58.4 CO2 a 1 mol 1 mol ? ? b 1 mol 3 mol ? ? c 3 mol 1 mol ? ?

Chemistry
2 NaOH + CuSO4  Na2SO4 + Cu(OH)2 100g of Cu(OH)2 is needed. Assuming 100% yield, how much of 1M NaOH and 0.5M CuSO4 must be used in mL?

Physics
A 2.2-kg baseball is pitched to you at 21 m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.17 s, what is the magnitude of the average force the bat exerted on the ball? Please show all work and provide any nec...

Direct way to improve yield of ball mill
The Ball Mill as a general grinding equipment, is widely used in dressing, building materials and chemical industry, ball mill can be divided into dry and wet type two kinds of grinding way. According to the row of ore in different ways, and can be divided Grate Ball Mill and ...

The defects of ball mill
The Ball Mill faults: (1) work efficiency is low, the power consumption unit. (2) the ball mill barrel rotational speed is low (about 15 ~ 27 r/min), if you use ordinary motor that. The average all need equipped with expensive reducer. (3) grinding medium in the impact and gri...

Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.

Life orientation
Identify and describe three environmental health hazards that cause ill health ,crises ,and globally .include evidence that is current of the identified issues .use graph s,statistics,pictures etc to show evidence of your information.

life orientation
environmental health hazards that cause ill health,crises,and or disasters within your community or any other community within south africa and globally

collage math
f(x)=x^3+3x find the rate of change between the two stated values x:1 to 2

Art
The last one has all the right answers but 4 is c

life science
true or false? The temperature varies greatly throughout the year in a tropical rain forest.

chemistry
hey drbob222, where did u get 500ml from? question is: 1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is broug...

chem
where did u get 500ml?

chem
1.00 mL of a 0.0500 M sucrose solution is transferred to a 100 mL volumetric flask, and the flask brought up to volume. 5.00 mL are taken from the 100 mL volumetric flask and transferred to a 0.500 L flask, and it is brought up to volume. What is the resulting concentration of...

physics
A particle moving with uniform acceleration in a straight line was first observed to be moving at 4.5 m/s. After 10 sec, it was moving at 6.8 m/s. What is its acceleration?

perimeter
how to draw a 15 cm and 9 cm perimeter

Chemistry
I need to determine the "percentage composition unknown" whatever that is. My current data: a) mass of test tube and foil cover: 7.5323 g b)temp of water bath: 375.65 K c) mass of test tube and foil and gas as sample: 7.5423 g d) barometric pressure: 1.0190 kpa e) ma...

biology/poetry
Plant life stretched up Hoping for sunlight Optimism failed Tall trees stealing the gold Overcast skies blocked the Sun, giver of life Yesterday--not a cloud in the sky Nightime, just quiet stars Terribly impatient for a new day Hot, warm, drenched in sunlight Everlasting hope...

7th grade
just 754/9471. Nothing else you can do :)

8th grade
As I do not know the context--perhaps she was faking an injury? It would be helpful to provide a source!

geography
very, very carefully. You probably shouldn't--for several reasons (which I will list) 1. You value your own sanity 2. You value your time 3. The constitution is a very long document, but to leave any part out would warp its meaning. The words are there for a reason. If you...

minum distance
Find the minimum distance from the point (3,0) to y=(x)^1/2

Expository Essay Help
John f. kennedy was born in a family with a history of political and public service

Algebra
You would take your answers and plug them in to the equation. 4(-6^2)+4(-6)-120=0 and 4(5^2)+4(5)-120=0 then work out the problems and if you are correct 0=0 Hope this helped

arithmetic
Thank you for correcting me, my finger must have hit the 5 instead of the 2. The answer is #3.12 Thanks

arithmetic
when you are working with a percentage you move the decimal two spots to the left and then multiply the purchase by the percentage of tax in decimals. $48x0.065= $3.15 I hope this helps

algebra
I know the answers I just am not sure how to work the problem to get them. (a)78 (b)67.5 Please help me with the working of these problems. Thank you

algebra
students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=78-15log(t+1) (a)find the students average score when they first took the final exam. (b)what would be the expected average score be on...

algebra
Suppose that $4000 is invested at an interest rate of 5.5% per year, compounded continuously. What is the balance after 8 years?

chemistry
Thank you guys I will try both suggestions

chemistry
How do I work out the density of HCI at 600 celsius ? Thanks

Ethics ADJ/235
CheckPoint: Interpretation of Ethical Systems Review the scenario in Situation 1 on p. 50 of the text.Write a 200- to 350-word paper in which you explain how you would respond to the scenario. Address these ethical systems in relation to the scenario: ethical formalism, utilit...

math
what is 3/4 times 11/12? thnx!

9th grade
ABUOYANTGIRLANT

social studies
during which twenty year period did the native american population of central mexico fall by around four million?

math
(-11) (1/8) find the product

English expression
internet friends

math
however,6 is not a variable..the question is asking to solve for y in terms of other variables

math
that means that still equal to 6 right?

math
{y-2}/(a^2-5a+6)=(a+1)/(a-3)-(a+2)/(a-2) How can I solve for y in terms of the other variables??? I tried many times, but I just get y=6,can't express y in terms of variables. Can anyone please correct me or teach me?THANKS A LOT!

solcial studies
what made Jamestown a bad settlement?

Economics
After the U.S. invasion of Iraq, the price of jet fuel used by airlines increased dramatically. As the CEO of Air Canada, you have been presented with the following options. Evaluate these options in the context of decision making model. a) raise airfares to offset cost increa...

acids and alkalis
Vinegar soap Handwash Mouth Wash baking soda cold tea Ammonia Bleach Washing Powder Oven cleaner

math
how manyyards are in a mile? 1760 I think There are 5,280 feet in a mile. There are 3 feet in a yard. 1 mi x (5,280 ft/1 mi) x (1 yd/3 ft) = ?? Note that the first factor cancels miles and changes miles to feet, the second factor cancels feet and converts to yards. The idea he...

sociology
I am a student as well and having trouble with my ethnic class... how funny, we all hang out in here... good luck all!

Math
There are 5 rows - there are 4 items in each row - there are NO more than 10 items Any idea how this can be solved? Draw a 5 pointed star connecting all the vertices. Place one item at each vertex and one item at the intersection of the lines joining the vertices. Thus, 10 ite...

Math
Only the 1, +, -, X, / , (, ), and = keys on a scientific calculator are working. How can a result of 75 be reached by pushing these keys less than 20 times? isn't five squared twenty-five, multiplied by three...

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