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Cynthia
Questions and answers by
Cynthia
, page 3
Questions (307)
A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the besst procedure for preparing this solution ?
2 answers
520 views
A 30.00-mL sample of weak acid is titrated with 0.0167 M NaOH. At the endpoint , it is found the 40.35 mL of titrant was used.
2 answers
1,103 views
A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the best procedure for preparing this solution ?
3 answers
1,550 views
What mass of oxalic acid dihydrate , H2C2O4•2H2O, is required to prepare 220.0 ml of a 1.28 M solution of oxalic acid ?
4 answers
2,827 views
In basic solution, H2O2 oxidizes Cr+3 to Cro4^-2 and is reduced to OH-. What is the balanced equation?
4 answers
2,852 views
The concentration of Pb+2 in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of
2 answers
1,009 views
Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation =
2 answers
990 views
Calculate the volume (in mL) of 9.0M H2SO4 that you would need to convert 0.070 moles of KAl(OH)4 to K2SO4 and Al2(SO4)3
4 answers
1,810 views
Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation =
4 answers
800 views
How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?
4 answers
2,772 views
Calculate the percent yield of alum if you obtained 75.0 g of potassium alum from 5.00 g Al.
4 answers
2,719 views
If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of
potassium alum?
4 answers
3,453 views
What how can I calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4.
3 answers
1,472 views
Using the van der Waals equation, determine the pressure of 436.0g of SO2(g) in a 7.30-L vessel at 725k.?
For SO2(g),
3 answers
516 views
How many liters of hydrogen gas can be made from 65.5g of magnesium at STP?
Magnesium reacts to sulfric acid according to this
2 answers
910 views
Zn metal was allowed to react with hydrochloric acid to produce hyrdogen gas.This gave a total of 555mL of gas collected over
4 answers
991 views
Determine the molarity of a sodium hydroxide solution? if 37.34 mL of it are required to neutralize 1.922 g of citric acid.
balan
3 answers
816 views
A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....?
A student titrated 1.852 g of a mixture
4 answers
2,072 views
A fire helicopter carries a 520-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant
4 answers
731 views
A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.255.
(a) When the
4 answers
1,640 views
What is a medical scientist,if you want to study medical science,what are the minimum requirements?and how can you briefly
2 answers
1,110 views
How do you work this problem? Find the exact value of sin 2u, cos 2u, and tan 2u given that cot u=3 and 180<u<270
1 answer
443 views
Carole earns 2.50 for each gadget she completes, what was her gross pay if she completed 145 gadgets last week.
1 answer
451 views
Use the given equation to answer the following questions. (Enter your answers from smallest to largest.)
r = 8cos(¦È) 0 ¡Ü
2 answers
512 views
A weather balloon if it starts with 10 liters of helium at 0km elevation and a temperature of 20 degrees. it is released and
2 answers
491 views
How do you find the reciprocal of 5/3
1 answer
304 views
How to find the reciprocal of 5/3?
1 answer
312 views
Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to
two decimal places. Please explain.
1 answer
402 views
Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two
decimal places. Please Explain
3 answers
440 views
Prove that tan^2(alpha)-1+cos^2(alpha)sin^2(alpha)
Please Explain
3 answers
462 views
Prove that tan (Beta) sin (Beta) + cos (Beta) = sec (Beta)
Please explain.
4 answers
1,923 views
Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)
1 answer
329 views
how does the musculoskeletal system change from birth to adulthood to achieve 206 bones?
1 answer
405 views
Evaluate (integral) cot 2x dx.
A. 1/2Ln sin 2x+C B. 1/2Ln cos 2x+C C. 1/2Ln sec 2x+C D. 1/2LN csc 2x+C
1 answer
438 views
Evaluate (Integral) sin 4x cos^2 4x dx.
A. Cos^3(4x)/3 + C B. -Cos^3(4x)/3 + C C. Cos^3(4x)/12 + C D. -Cos^3(4x)/12 + C
2 answers
885 views
Evaluate (integral) e^3x dx.
A. e^3x + C B. 1/3e^3x + C C. e^4x + C D. 1/4e^4x + C
1 answer
299 views
Which of the following is a step in evaluating.
(Integral) cos^2 5x dx A. (Integral) 1+cos10x/2 dx B. (Integral) 1-cos10x/2 dx C.
3 answers
718 views
to evaluate (integral) 3x^2 cos (2x^3-4) dx, it is necessary to let
A. u=3x^2 B. u=6x C. u=2x^3-4 D. u=6x^2
2 answers
497 views
evaluate (integral) xe^2x dx
A. 1/6x^2 e^3x+C B. 1/2xe^2x-1/2e^2x+C C. 1/2xe^2x-1/4e^2x+C D. 1/2x^2-1/8e^4x+C Evaluate (integral)
3 answers
577 views
Find the centroid of the area bounded by the parabola y = 4 - x^2 and the x-axis.
A. (0,1.6) B. (0,1.7) C. (0,1.8) D. (0,1.9)
2 answers
802 views
Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)
1 answer
322 views
Find the exact value of tan2(Beta) if sin(Beta) = 5/13 (Beta in Quadrant II)
2 answers
580 views
Trying to be on time for class, a girl moves at 2.4 m/s down a 52 m-long hallway, 1.2 m/s down a much more crowded hallway that
6 answers
2,261 views
A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The
2 answers
548 views
A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The
1 answer
523 views
I was wondering if you could tell me if my sentence structure using ":" and quotations is correct...
Furthermore, when Howard
1 answer
384 views
1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the closed interval [0,1/2].
2. Determine whether Rolle's
2 answers
2,627 views
You own a portfolio that has $1500 invested in Stock A and $2,600 invested in
Stock B. If the expected returns on these stocks
1 answer
629 views
How does one's cognitive processes shape some aspects of personality?
1 answer
395 views
How does biological and environmental factors shape our cognitive processes?
3 answers
1,121 views
Find the equation of the line that passes through the pair of points. Write your answer in slope-intercept form (2,-5)(2,-1)
3 answers
1,372 views
1.Identify the reason for the comma(s) in the following sentence:
When you have the opportunity to interview for a job, you can
4 answers
702 views
The numbers i�ã5 and -i�ã5 are solutions to which equation?
a. x^2+�ã5=0 b. x^2+5=0 d. x^2-5=0
4 answers
301 views
Simplify.
(2-5i)-(3+4i)
3 answers
840 views
39x + 75y over the square root of 97 =650 how do I solve this?
1 answer
330 views
What fundamental motor patterns do girls attain quicker than boys
2 answers
556 views
For a motor vehicle traveling at r miles per hour, the distance d in feet required to stop is approximately d=0.05r^2 + r. If a
1 answer
453 views
when 2 moles of potassium chlorate crystals decompose to potassium chloride crystals and oxygen gas at a constant pressure and
3 answers
1,516 views
5 contributions of Ancient Greece to modern society
3 answers
686 views
4.During the energy crisis of the 1970s, and again in the last 5 years, Congress bemoaned the “price gouging” and
1 answer
440 views
If the specific heat of water is 1.0 calorie/gram°C, how many calories are required to raise 500 grams of water 10.0°C?
4 answers
2,070 views
Ben is making wooden toys for the next art and craft sale each toy cause Ben $1.80 to make. If he sells the toy for three
1 answer
472 views
An unknown substance with a mass of 300 g absorbs 1000 j of heat while undergoing a temperature increase of 15 degrees c. What
2 answers
570 views
John has 4 cups filled with fruit juice.He said that he has a gallon of fruit juice.Is his statements reasonable?explain why or
1 answer
456 views
What is the similarities between conduction and radiation
What is the similarities between convection and radiation
18 answers
2,019 views
How many grams of gasoline would you need to burn if you started with a 275 gram piece of ice that started at -25 OC and by the
4 answers
535 views
What is the principle part of the italicized verb in this sentence (suppressed) from "The Story-Teller"?
The aunt suppresed a
10 answers
1,542 views
A 1-m-tall barrel is closed on top except for a thin pipe extending 6.0 m up from the top. When the barrel is filled with water
1 answer
855 views
If n represents a number, write an expression for one-half of three less than the number.
4 answers
1,658 views
(For this, i know the equation for constant of variation is y=kx, but i just forgot how to solve it)For the eqaution -4y=8x,
1 answer
388 views
Tim tracked the change in outside temperature one afternoon. He record a temperature of 98.3 degrees at noon. Bathe temperature
2 answers
778 views
You have a boat that is capable of moving at 10.4 m/s through still water. You wish to cross a river that flows due west at 2.8
3 answers
521 views
I don't have a close about this question !!!!!!!! It takes you 3 hours to drive to a concert 135 miles away. You drive 55 miles
3 answers
1,075 views
A homogeneous disk of mass m and of radius r free to rotate without friction about its horizontal axis, is used used as a
2 answers
833 views
If no digit may be used more than once, how many 2-digit numbers can be formed using only the digits 5, 6, 3, and 2?
4 answers
727 views
Rick made $33000 last year he also made $3000 selling vases at craft shows.which part of rick income is fixed income?
3 answers
397 views
I cant get this stupid question, this is disgusting and I just want to get this over with.
What the word for when blood rushes
7 answers
591 views
In the following sentence, what word does the participial phrase modify?
Everyone in the annex heard her screaming loudly
9 answers
860 views
Social effects of poor service delivery.
4 answers
675 views
The normal to the curve y = ax^1/2 + bx at the point where x = 1 has a gradient 1 and intercepts the y-axis (0,-14). Find a and
4 answers
1,886 views
The sum of a number and 10 is -10
1 answer
308 views
Carolyn plans to use her 25% employee discount to buy a $39 lamp because she is redecorating her bedroom
1 answer
340 views
The sum of a number and 10 is -10
2 answers
487 views
Twice n,less three,equals 5
How do you write it as an equation?
5 answers
438 views
Alkali metals can be used for all but one of the following
4 answers
489 views
What are the impact of risk behaviour?
2 answers
795 views
Shown that alpha =3alpha and beta =2alpha
3 answers
367 views
The Dna is bond with what ?
1 answer
375 views
The second term of a GP is 4, the fifth term is 81, find the seventh term
4 answers
2,978 views
What is the equation of the line that includes the point (4,-3) and has a slope of -2?
A. y = -2x - 5 B. y = -2x - 2 C. y = -2x +
3 answers
387 views
An airplane has a mass of 2.56x10^4 kg and takes off under the influence of a constant net force of 1.90x10^4 N. What is the net
3 answers
336 views
A rocket of mass 3.45x10^5 kg isn’t flight near earth surface. it’s the rest is directed at an angle of 52.2° above the
1 answer
315 views
A planet has a mass of 5.21x10^23 kg and a radius of 2.77x10^6 m. (a) what is the acceleration of this planet? (b) how much
3 answers
727 views
15.47 × 0.0852/(254)^1/3
5 answers
566 views
A 1400 kilogram car crests a 3200 m pass in the mountains and briefly comes to rest. The car descends 1000 m before climbing and
1 answer
228 views
A 12 g fly, attached to a fly fishing rod, comes undone and hits a wall with a velocity of 3.2 m/s to the right. It rebounds
1 answer
257 views
To determine the insurance of a car, an insurance company considers the following determinants; the model of car, the age the
2 answers
1,053 views
Outside temperature over a day can be modeled as a sinusoidal function. Suppose you know the high temperature of 94 degrees
3 answers
619 views
PCl3(g)+Cl2(g)⇄PCl5(g) Kc=0.11
A 0.60mol sample of PCl3(g) and a 0.70mol sample of Cl2(g) are placed in a previously evacuated
4 answers
1,629 views
Find the value of x,given that x+1,2x and 2x+3 are consecutive tems of a linear sequence
1 answer
300 views
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