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Helen

Questions (417)

I just have SO much trouble with remembering new languages! Does anybody have any ideas to help me remember and to have fun
1. 4 answers
2. 621 views
Please choose the correct option to complete the following statements. (6 marks)a) If a large amount of base is added to water,
1. 3 answers
2. 544 views
What volume of a 0.5 M solution is required to prepare 250 mL of a 0.15M solution?(Note: M = mole per Litre)
1. 1 answer
2. 1,624 views
t(seconds) 0 1 2 3 4 5s(feet) 0 10 32 70 119 178 Find the average velocity for the time period beginning when t=2 and lasting
1. 1 answer
2. 386 views
write the equilibrum constant expression for Kp of the following:a.) O2-->--<2O3(g) b.)SiH4(g) + 2O2(g)-->--<SiO(s) + 2H2O(g)
1. 1 answer
2. 669 views
At 450oC, the equilibrium constant Kc for the Haber-Bosch synthesis of ammonia is 0.16 for the reaction writeten as 3H2(g) + N2
1. 1 answer
2. 915 views
What is the difference between overpopulation and Consumption overpopulation? What components would you find in an overall plan
1. 1 answer
2. 695 views
Environmental Science involves the fields of Science, economics, and politics. Take a current environmental issue, such as the
1. 0 answers
2. 583 views
A mixture of O2 and SO2 is confined in a vessel at equilibrium. Which statement describes the conditions that are true for the
1. 1 answer
2. 1,281 views
A 1.5 gram sample of a gaseous hydrocarbon has a volume of 820 mL when measured at 227 oC and 2.50 atm. Which of the following
1. 1 answer
2. 624 views
If 6.0 liters of methane react with 12.0 liters of oxygen according to the equationCH4 + 2O2 → CO2 + 2H2O, and the temperature
1. 4 answers
2. 880 views
a sample of an unknow metal exists as a perfect cube that meausres 0/78 in on a side and weighs 61.4 grams. what would be the
1. 3 answers
2. 526 views
The heat capacity of lead is 0.13 J/g•°C. How many joules of heat would be required to raise the temperature of 15 g of lead
1. 2 answers
2. 3,024 views
6%pa compounded semi-annuallyPrincipal-$6000 I need to find out how many interest periods for the amount to grow to $9500. What
1. 1 answer
2. 456 views
What is the mass of 14.7 moles of H2O?What is the mass of 7.2 Liters of H2O?
1. 1 answer
2. 362 views
Does an electroscope losing its charge by being grounded violate the law of conservation of charge?
1. 1 answer
2. 895 views
The Henry’s Law Constant for dimethyl sulfide is 0.14 mol/L-atm. Itsatmospheric concentration is 0.001 ppb (i.e., 0.001µg/L).
1. 0 answers
2. 491 views
You have a tuning fork of unknown frequency. When you ring it alongside a tuning fork with known frequency of 360 Hz, you hear
1. 2 answers
2. 1,577 views
A tuning fork has been damaged and its frequency slightly changed. What could its altered frequency be if it produces two beats
1. 1 answer
2. 1,215 views
An energy of 6.0×10−2 J is stored in the metal sphere on top of a Van de Graaff generator. A spark carrying 1.0 micro-coulomb
1. 1 answer
2. 3,269 views
A droplet of ink in an industrial ink-jet printer carries a charge of 1.1×10−10 C and is deflected onto paper by a force of
1. 1 answer
2. 13,135 views
Electronic types neglect the force of gravity on electrons.To see why, compute the force of Earth's gravity on an electron and
1. 1 answer
2. 746 views
Two pellets, each with a charge of 0.80 microcoulomb (8.0×10−7 C), are located 4.0 cm (4.0×10−2 m) apart. Find the
1. 2 answers
2. 1,017 views
A rocket with initial mass of 7.50×103 kg is fired in the vertical direction. Its exhaust gases are ejected at the rate of
1. 1 answer
2. 595 views
A bucket contains blue balls and yellow balls. the probability of removing two blue balls without replacement is 2/5 and he
1. 1 answer
2. 1,103 views
I am trying to double check my answer, I completed a spatter blot of an assignment, 20 student, variables study hours and final
1. 2 answers
2. 541 views
How many gallons of 15% iodine solution should be mixed with 40% iodine solution to make 100 gallons of a 20% solution?
1. 1 answer
2. 431 views
Simon issues four-year bonds with a $50,000 par value on June 1, 2011, at a price of $47,974. The annual contract rate is 7%,
1. 0 answers
2. 418 views
A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed
1. 0 answers
2. 772 views
A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed
1. 4 answers
2. 3,422 views
a saturated solution of barium chloride at 30c contains 150g water. how much aditional barium chloride can be dissloved by
1. 2 answers
2. 613 views
a saturated solution of barium chloride at 30c contains 150g water. how much aditional barium chloride can be dissloved by
1. 1 answer
2. 524 views
For the list of chemicals below, write complete, balanced equations for all possible reactions that would lead to an insoluble
1. 1 answer
2. 4,071 views
A car traveling at 120 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.90 .Wh
1. 1 answer
2. 831 views
A car traveling at 120 strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.90 .Wh
1. 2 answers
2. 665 views
farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row
1. 3 answers
2. 2,988 views
For any distribution (normal or not normal), the probability of selecting a score greater than the median is
1. 1 answer
2. 1,302 views
Assume that there is a perfect competition market for a good X. If one supplier all of a sudden wins the lottery and buys all
1. 0 answers
2. 612 views
Why is oxygen less soluble in water as temperature of the water increases ?Are there any elements that are like this too?
1. 1 answer
2. 505 views
What influence does culture have on personality? Do you see a persons reaction to something as separate from social experience
1. 2 answers
2. 615 views
Could some please help me with this? I am not sure what to really say. Thanks!Describe the historical development of police
1. 1 answer
2. 384 views
Could someone please help me with this question?What are crime rates? This is what I have so far: Crime rates are the number of
1. 2 answers
2. 629 views
Could someone please help me with this question?What is the relationship to the law and the government structure as it applies
1. 3 answers
2. 669 views
How do I solve for:5000 = 45t^2 + 240t + 450
1. 1 answer
2. 390 views
what is 4a-7=4(a-2)+1?
1. 1 answer
2. 282 views
Two 125 kg bumper cars are moving toward each other in opposite directions. Car X is moving at 10 m/s and Car Z at –12 m/s
1. 3 answers
2. 1,699 views
VWXYZ is a rectangle-based pyramid where WX=66 cm and XY=32cm. The vertex is vertically above the center of the base. Given that
1. 4 answers
2. 2,443 views
Complete the table below:For each of the following sets pick the compound with the highest conductivity in a 1 M aqueous
1. 19 answers
2. 770 views
The approximate vapor pressure of CS2 at 30 degrees Celsius?
1. 0 answers
2. 955 views
1. Nitrogen gas and sodium liquid are produced by the decomposition of sodium azide NaN3 (s). what volume of nitrogen gas,
1. 5 answers
2. 1,150 views
I'm having a hard time understanding how to fine the Total Area(T.A) for a regular pyramid.
1. 1 answer
2. 518 views
In a certain store, there is a .05 probability that the scanned price in the bar code scanner will not match the advertised
1. 1 answer
2. 952 views
At an outpatient mental health clinic, appointment cancellations occur at a mean rate of 1.60 per day on a typical Wednesday.
1. 1 answer
2. 1,040 views
The probability of a manufacturing defect in an aluminum beverage can is .00003. If 100,100 cans are produced,(a) Find the
1. 0 answers
2. 906 views
The fracture strength of a certain type of manufactured glass is normally distributed with a mean of 575 MPa with a standard
1. 0 answers
2. 559 views
Police records in the town of Saratoga show that 18 percent of the drivers stopped for speeding have invalid licenses. If 16
1. 1 answer
2. 815 views
Which is the correct form of equilibrium expression of the following reaction.2PbS(s)+3O2(g)reverse arrow 2PbOs + 2SO2g Why is
1. 1 answer
2. 1,917 views
If 10.6 mol of carbon monoxide is produced how many grams of carbon were used?How do you convert moles to grams? And what are
1. 1 answer
2. 1,136 views
Given following reduction potentials in solution. Which is weakest oxidising agent in the list. List of numbers on right is for
1. 1 answer
2. 653 views
What is pH buffer of 0.1 mol L-1 Na2HPO4/O.15 mol L-1 KH2PO4?KH2PO4? Given Ka(H2PO4-) = 6.2 x 10-8). I would like to know the
1. 1 answer
2. 2,719 views
Calculate pH of 0.02 mol/L Ba(OH)2 solution. (Assume 100% dissociation).
1. 0 answers
2. 391 views
A volume of 25.0 ml of 0.100 M CH3CO2H is tiltrated with 0.100 M NaOH. What is pH after the addition of 12.5 mL of NaOH? (Ka for
1. 1 answer
2. 458 views
A volume of 25.0 ml of 0.100 M CH3C02H is titrated with 0.100 M NaOH. What ispH after the addition of 12.5 ml of NaOH? (Ka for
1. 1 answer
2. 788 views
calculate cell potential at 25C for:3Fe3+(aq) + AL(s)= 3Fe2+(aq)+ Al3+ (aq) if Fe3+ = 0.300 M, Fe2+ = 0.150M Al3+ = 0.300M. The
1. 1 answer
2. 2,365 views
We're reviewing and I forgot how to do this.Given y=x2-4+3 (x2 is x squared) a)write in standard from b)find vertex c)find
1. 1 answer
2. 623 views
Simplify the following (6b-2)(6b+2)+4(b^2-3b)Find the factors of the following e^2+8e+15 5f^2-15f+10 Does g^2-9 have factors? If
1. 2 answers
2. 415 views
Can i combine the following? Explain why or why not.5x+4x(squared) 7x(cubic)-2x+x(cubic)-5x 3xy+2y
1. 2 answers
2. 400 views
How does division work? Can you describe a picture of what happens during division?
1. 1 answer
2. 383 views
-9(x-3)^2=-7^3square root 4/3
1. 1 answer
2. 317 views
I need help with these problem please.X^2+6=15 (x+4)^2=6 can some one help me please.
1. 1 answer
2. 312 views
name 2 homes where some of the most famous authors of Florida have lived and visit at least 2 places they have described in
1. 5 answers
2. 493 views
An airplane is pressurized to 650mm Hg, which is the atmospheric pressure at a ski resort at 13,000ft altitude.a. if air is 21%
1. 3 answers
2. 7,274 views
The four tires of an automobile are inflated to an absolute pressure of 200000 Pascals. Each tire has an area of 0.024 m^2 in
1. 2 answers
2. 578 views
translate to an algebraic expression.13 less than b
1. 6 answers
2. 803 views
a driver who drives at a speed of r mph for t hr will travel a distance d mi given by d = rt miles. How far will a driver travel
1. 4 answers
2. 1,416 views
We all Crave Horror Movies essay by Stephen KingWhat does King mean in paragraph 4 when he says that horror movies are
1. 0 answers
2. 870 views
I remember instances where I fell.when or where ?
1. 3 answers
2. 896 views
Is the grammar in the following sentence ok?For, surely, the paintings were created by people who were not so different than
1. 5 answers
2. 740 views
1) Their kindness will give me the gift of patience...does this sound okay? 2)In this method, I could learn from different areas
1. 1 answer
2. 955 views
1) "I would like to learn as much as possible as soon as possible"Should there be a comma after the first "possible?" 2)"The
1. 1 answer
2. 351 views
The field school was an amazing and eye-opening experience in which I was able to travel to an area I had never visited before
1. 2 answers
2. 370 views
Sometimes it took days until I could pull out the artifact that had staring me in the face, and not doing so beforehand had
1. 1 answer
2. 322 views
How are the family
1. 1 answer
2. 301 views
If the median is greater than the mean on a set of test scores, describe the situation.
1. 1 answer
2. 521 views
i need help with answering homework questions
1. 1 answer
2. 531 views
Why is it important to use caution before putting any personal information on a computer? (example(s) required)I think everyone
1. 1 answer
2. 535 views
who was president during Muller vs. Oregon? Roosevelt or Taft?
1. 3 answers
2. 556 views
a 4.8 force acts on a 4.4 kg mass that sits on a frictionless table for 6.4 meters. What is the Kinectic Energy that the object
1. 1 answer
2. 958 views
a 4.8 force acts on a 4.4 kg mass that sits on a frictionless table for 6.4 meters. What is the Kinectic Energy that the object
1. 0 answers
2. 370 views
An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an
1. 2 answers
2. 1,274 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 1 answer
2. 381 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 2 answers
2. 319 views
A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is
1. 2 answers
2. 1,259 views
Considering all values of x and y for which x+y is at most 7, x is at least 2, and y is at least -1, what is the minimum value
1. 4 answers
2. 1,089 views
If a,b,c,d, and x represent positive real numbers, what is the maximum value of the function f(x)= a[cosb(x+c)]-d?
1. 2 answers
2. 1,626 views
Each element in a data set is multiplied by 2, and each resulting product is then increased by 5. If 'm' is the mean of the
1. 2 answers
2. 773 views
Each element in a data set is multiplied by 2, and each resulting product is then increased by 5. If 'm' is the mean of the
1. 0 answers
2. 626 views
A diameter of circle that has endpoints (-4,12) and (8,-2), as shown below, is in the standard (x,y) coordinate plane. What
1. 1 answer
2. 576 views
A pine tree casts a 12-meter shadow on level ground. The angle of elevation from the tip of the shadow to the top of the tree is
1. 0 answers
2. 1,138 views
A vehicle starts w/ a full tank of gasoline and travels 150 miles. While refilling the tank, the driver notes that the vehicle
1. 2 answers
2. 1,494 views

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