Monday
September 22, 2014

Posts by christine


Total # Posts: 432

Chemistry
when is it appropriate to use gravity filtration and when to use vaccume filtration
September 27, 2010

Chemistry
when is it appropriate to use gravity filtration and when to use vaccume filtration
September 27, 2010

Chemistry
where would the safest location on the bench to set up and use a labratory burner explain why
September 24, 2010

Chemistry
when an object was weightedon a top loading balance the balance display read 13.730 the mass was recorded as 13.73g what is wrong with that explain the answer
September 24, 2010

Chemistry
it is considered a saftey hazard to leave an operating burner unatteneded unless the flame is made luminous10 explain why
September 24, 2010

Chemistry
what is the difference between a basic bunsen burner and the tirrll burner
September 24, 2010

economics
If q(P) = 100/P and c(q) = q2 , what is the optimal level of output of the monopolist?
September 9, 2010

Adult Development and Psychology
Urie Brofenbrenner
September 7, 2010

math
A total of 1200 students attend top view high school. The ratio of teachers to students is 1:30. How many teachers are there at the school?
September 5, 2010

science
A viaduct is being re-levelled by using a jackscrew with a pitch of 5mm. The mass of the top slab of the viaduct is 20 tonnes (20000kg) and its length is 40m. The lever arm used to turn the jackscrew is 60 cm long. Calculate the effort force to be applied to the end of the ...
September 2, 2010

physics
for the first question, there is 1g of water per 1 cm cube therefore there is 1000 kg of water per 1 m cube that is your answer for the 2nd one, im not sure
September 2, 2010

science
Three distinct layers of different tissue cells form the walls of blood vessels. The outer most layer is connective tissue. The middle layer is smooth muscle. The inner wall is primarily composed of endothelial cells.
September 2, 2010

french
I'm not sure I understand what youre asking here because I dont see any underlined words?
September 2, 2010

french
revois m'attendra irons emmenerons passerons
September 2, 2010

science
To stop an elevator in free fall, brakes are installed between the walls of the elevator car and the walls of the shaft in which the car moves. In addition, springs with compression coils are installed on the floor, at the bottom of the shaft, in order to absorb the residual ...
September 2, 2010

biology
For each of the following listed below, explain how it enhances the plants ability to survive and reproduce in a terrestrial environment. B) Pollen C) Waxy cuticle
August 25, 2010

Chemistry
How could hard water decrease the efficiency of your kettle?
August 18, 2010

Chemistry
Explain why the type of metal used in creating fireworks determines the colour seen when the fireworks are set off. Discuss what occurs within the metal atoms.
August 18, 2010

Chemistry
Explain what will happen to the volume of a gas as the pressure on that gas is increased. Assume that the temperature and amount of gas remain constant.
August 18, 2010

Chemistry
List three ways in which human activities have contributed to the production of gases that dissolve in water to form acid precipitation
August 18, 2010

Chemistry
If the percentage yield of a reaction was 78.51% and the theoretical yield was 288.0 g, what was the actual yield?
August 18, 2010

Chemistry
The percentage composition of chlorine, by mass, in the compound K2PtCl4 is
August 18, 2010

Chemistry
What is the difference between inference and observation?
August 18, 2010

Chemistry
Would distilled water conduct electricity? Why or why not?
August 18, 2010

Child care
I don't understand what Profit Margin is. How is the answer to 13 B? When the information provided, that the answer should be D.
August 16, 2010

college
I need help writing an outline for a persauasive essay?
August 15, 2010

biology
give 2 examples each of situations in which you might use the following pesticides Insecticides and fungicides
August 12, 2010

biology
explain the difference between gymnosperms and angiosperms give give 5 examples of each that are ontario native
August 12, 2010

biology
a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of the sea lamprey and its effects on the Great Lakes.
August 12, 2010

biology
3. Describe the role of microorganisms (bacteria or viruses) in: a. Genetic manipulation and medical research b. Ecosystem (such as bacteria used as decomposers. Oil spill clean up) c. Food industry (microbes which are used to make yogurt)
August 12, 2010

Biology
Using the words hypertonic, hypotonic, and equilibrium correctly , predict what happens when, A) A living cell is placed into fresh water and B)A different living cell is placed into salt water.
June 14, 2010

English
I have to have 5 sentences with different verb tenses, stating The role of education in successful finanical planning.
June 12, 2010

Algebra 2 Honors
haha that would be funny, but really there are two of us here (:
June 6, 2010

Algebra 2 Honors
if that confused you, haley and i are working together.
June 6, 2010

Algebra 2 Honors
yes, but that is not an exact answer. i need a fraction of some sort, not a rounded decimal
June 6, 2010

Algebra 2 Honors
THANK YOU!
June 6, 2010

Algebra 2 Honors
1.25 is what i got
June 6, 2010

Algebra 2 Honors
im stupid
June 6, 2010

Algebra 2 Honors
The amount of light emitted from a battery indicator bulb pulses while the battery is charging. This can be modeled by the equation y = 60+60sin[(pi/4)t] , where y is the lumens emitted from the bulb and t is the number of seconds since the beginning of a pulse. At what time ...
June 6, 2010

Algebra 2 Honors
Find the exact value by using an appropriate sum or difference identity. cos(165) degrees
June 6, 2010

Algebra 2 Honors
Find all solutions if 0 degrees is less than or equal to x and x is less than 360 degrees. 2 sin^2(x)+ sin(x)=1
June 6, 2010

Algebra 2 Honors
sin 2x(cot x + tan x) = 2 (verify the identity)
June 6, 2010

Grammar,
Please can you tell me if these are correct. Identify the noun clause. I put brackets around them. 1. (How the secret leaked out) was not immediately apparent. 2. (Where the stall has moved to) has not been ascertained. 3. The invited guests said (they would attend the party...
June 5, 2010

Grammar again
What is the difference between a noun phrase and a noun clause? This says to change box b into noun phrases to match box A. Example: I can't get over... I hear her rude comments. I can't get over hearing her rude comments. But in this section of the book, it explaines ...
June 4, 2010

Noun phrases
We have to identify the noun phrases, I've put brackets around them. 1. (the children) are playing in the back garden. 2. Justin came to school with his (younger sister). 3. (the old woman) hobbled into the kitchen. 4. Look at (the short ugly looking boy) who is throwing ...
June 4, 2010

Chemistry-Dr. Bob
Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you
June 2, 2010

chemistry
A certain gas has a volume of 20 cu ft and a pressure of 10psia at -40 degrees F. What is the new pressure if the gas is compressed to 5 cu ft at -40 degrees C.. a. 0.025 psia b. 0.4 psia c. 10 psia d. 40 psia.
May 18, 2010

statistics
would the percentage of scores greater than 120 be 4.865 or 4.87
May 16, 2010

statistics
assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use teh 68-95-99.7 rule to find the following quantities: a. percentage of scores greater than 120
May 16, 2010

Chemistry
What is the formula for calcium oxalate dihydrate when 100 degree Celsius heat is added?
May 16, 2010

statistics
99.0-98.2/0.62 Answer = 1.29 Is this correct?
May 16, 2010

statistics
assume the body temperature of healthy adults distributed with a mean of 98.20F and a standard deviation of 0.62F. If you have a body temperature of 99.00F, what is your percentile score?
May 16, 2010

statistics
Using teh 68-95-99.7rule. Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores less than 100 b. relative frequency of scores less than 120 c...
May 10, 2010

statistics
Which of the following statements are correct? a. a normal distribution is any distribution that is not unusual b. the graph of a normal distribution is bell-shaped c. if a population has a normal distribution, the mean and the median are not equal d. the graph of a normal ...
May 10, 2010

math
Electrical system are governed by Ohm's law, which states that V = IR, where V=voltate, I=current, and R=resistance. If the current in an electrical system is decreasing at a rate of 9 A/s while the voltage remains constant at 14 V, at what rate is the resistance ...
May 2, 2010

Calculus
Find the derivative of (sin(^3)x)(tan x) Please explain to me in steps please , thank you
April 19, 2010

English
how peple come from
April 9, 2010

English
hi how are you
April 9, 2010

Chem
delta h is 2800
April 7, 2010

Math7
Find the cost of the following situation. Dress Sale: Regular:$160 Now:$112 What % is given on the price of the dress?
March 18, 2010

math
The basketball coach wants to know the perimeter of the court. The area of the court is 4700 feet2. What is the perimeter? The long side of the court is 94 feet.
March 18, 2010

Physics
A bullet with mass 0.40 kg is fired with an initial velocity of 400 m/s from a gun with mass 5.0 kg. The speed of the recoil of the gun is?
February 27, 2010

managerial finance
Find the current value per share of Suarez Manufacturing’s common stock.
February 23, 2010

Eth125
I just wanted to know if anyone has a course syllabus for this class. I start this class very soon and I would like to get a head start. Thank you so much.
February 19, 2010

soc 300
Explain the Modernization and Dependency theories as they relate to underdevelopment. What are the major contributions of each theory and what are the greatest weaknesses? Explain which theory of underdevelopment has greater empirical support, particularly statistical support...
January 16, 2010

algebra
Distributive, Associative, or neither? 3(bz)=(3b)z
January 14, 2010

physics
When a horizontal force of 7N acts on a block on a resistance free surface, it produces an acceleration of 3.5m/s^2. suppose a second 4kg block is dropped onto the first. what is the magnitude of the acceleration of the combination if the same force continues to act? Assume ...
December 7, 2009

Physics
Problem:: A 4.80 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.5 N at an angle q= 17.5° above the horizontal. What is the speed of the block 3.90 seconds after it starts moving? What I've got:: Using sin and cos, I'...
November 20, 2009

geometry
a right trapezoid
November 11, 2009

4th grade
need help with edhelperku puzzle
November 4, 2009

college
The clarke family went sailing on a lske . thier boat averages 6 kilometers per hour
November 4, 2009

physics
A 70.0 kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.760 and 0.610, respectively. What is the minimum normal ...
October 26, 2009

Skills for Learning in an Information Age
What are some ways in which you may make use of Web-based information and guard against plagiarism?
October 15, 2009

psychology 11
ya i think d. too.
September 10, 2009

English
Your Welcome!
September 10, 2009

English
Humerus I think is a bone and humorous is funny.
September 10, 2009

English
I would say #2 because it sounds better.
September 9, 2009

English
#1 is grammatically corect I think it sounds better. In #4 They will make you get better grades. The correct way to say that is They will help you get better grades. In #5 From your friends you can get help. The correct way to say that is You can get help from your friends.
September 9, 2009

7th grade
What is the definition of the word "hamebells" from the book "The Red Pony" by Steinbeck. I have searched all dictionary sources I could and can't seem to find out anythin on it. Is it, perhaps, a slang word for something else?
September 9, 2009

algebra
Do this problem one step at a time. Parenthesis's first, then multiplecation and division, next then adding and subtracting. Think of P.E.M.D.A.S.
September 9, 2009

Chemistry
student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight was 4 - 5 mm and the melting range ...
September 1, 2009

Chemistry
Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 – 218C. Is this a typical range for a melting point? If not, what range would be typical? For this question, does it mean an unknown compound in general...
August 30, 2009

O-Chem
Yea my prof was not very clear or did not clarify what hot water would be. Thanks for the help.
August 29, 2009

O-Chem
Then the minimum volume of hot water then is 2.70mL
August 29, 2009

O-Chem
Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7
August 29, 2009

integration
please help emergency. find double integral of x times y time e to the <x plus y> . bounded from <0,1> x <0,1>
August 21, 2009

Math
Can someone please check my answers below for accurateness? The instructions are: Differentiate and simplify. 1) y=(2x^2+3x-1)(3x^2-5x-3) y'=(4x+3)(3x^2-5x-3)+(2x^2+3x-1)(6x-5) 2) y=(5x^2+3x-1)(3x^2-5x-3) y'=(10x+3)(4x^2-3)+(5x^2+3x-1)(8x) 3)y=6x^3-7x^2+5x-7+x^(5/3)-7...
August 7, 2009

Math
a) determine the equation of the line that is perpendicular to the tangent to y=5x^2 at (1,5). b) determine the equation of the line that passes through (2,2) and is parallel to the line tangent to y=-3x^3-2x at (-1,5).
August 2, 2009

Health
AIDS/HIV funding and Research
July 28, 2009

English
his melancholy state of mind or his melancholy state-of-mind
July 4, 2009

English
what about post-death
July 3, 2009

English
loved-one or loved one
July 3, 2009

English
so age-group or no ?
July 3, 2009

English
Occur age group after age group and repeat time after time Should there by any dashes or hyphens here? should it be like: occur age-group after age-group and repeat time-after-time ???
July 3, 2009

algebra 2
x-1/x^2-x-20 Give the equivalent numerator if the denominator is (x - 5)(x + 4)(x + 3).
June 13, 2009

Math
A) A rectangle has perimeter 64 cm and area 23 cm^2. Solve the following system of equations to find the rectangle's dimensions. length=23/width length + width = 32 B) Solve the system of equations x^2+y^2=1 xy=0.5
June 7, 2009

Math
The dimensions of a gift box are consecutive positive integers such that the height is the least integer and the length is the greatest integer. If the height is increased by 1 cm, the width is increased by 2 cm, and the length is increased by 3 cm, then a larger box is ...
June 7, 2009

Math
I just have a quick question regarding this question: Simplify. State any restrictions on the variables. log(x^2+7x+12)-log(x^2-9) my answer is log[(x+4)/(x-3)] which is correct. However, for the restrictions, I believe that they are: x>3 and x<-4.. But the back of the ...
June 6, 2009

pre-calc
How bright a star appears can depend on how much light the star actually emits and how far away it is. The stellar magnitude scale can be adjusted to account for distance as follows: m_2 - m_1 = log (b_1/b_2) Here, M refers to a star's absolute magnitude, that is, how ...
May 16, 2009

Advance Math
The path around a square flower bed is 3 feet wide. If the area of the flower bed is equal to the area of the path, find the dimensions of the flower bed.
February 18, 2009

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