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Cynthia

Questions (307)

How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?
1. 2 answers
2. 2,865 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 =
1. 3 answers
2. 884 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
1. 2 answers
2. 1,917 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 =
1. 1 answer
2. 1,063 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
1. 1 answer
2. 1,080 views
In basic solution, H2O2 oxidizes Cr+3 to Cro4^-2 and is reduced to OH-. What is the balanced equation?
1. 1 answer
2. 2,941 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 ?
1. 2 answers
2. 2,929 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 ?
1. 1 answer
2. 1,611 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.
1. 1 answer
2. 1,185 views
A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the besst procedure for preparing this solution ?
1. 1 answer
2. 591 views
How many grames of lithium nitrate LiNO3 (68.9 g/mol) are required to prepare 174.1 mL of a 0.698 MLiNO3 solution ?
1. 1 answer
2. 583 views
What is the net ionic equation for the reaction that occures between nitrouse acid and strontium hydroxide ?
1. 1 answer
2. 1,507 views
What is the net ionic equation for the reaction that occures between nitrouse acid and strontiun hydroxide ?
1. 1 answer
2. 519 views
What elements do you think are critical when conducting project meetings and why do you think they are important? How do project
1. 1 answer
2. 428 views
A lightyear is a unit of length equal to the distance that light travels in 1 year. What is 1lightyear expressed in units of
1. 1 answer
2. 611 views
The enthalpy of combustion of benzoic acid is –26.4 kJ/g. What is the enthalpy ofcombustion expressed in joules per kilogram?
1. 3 answers
2. 2,245 views
How many 400-mg aspirin tablets can be made from 40.0-kg of aspirin?
1. 1 answer
2. 724 views
are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that
1. 1 answer
2. 828 views
Find the exact value of tan 5pi/12 using the half-angle identity.
1. 1 answer
2. 4,436 views
A 0.250g smaple of magnesium-aluminum alloy dissolves completely in an excess of HCl(aq). When the liberated H2(g) is collected
1. 1 answer
2. 1,115 views
why is a water molecule is much more likely to give up a proton than a methane molecule
1. 0 answers
2. 822 views
divide the product of 8 and 1/2 by .02
1. 2 answers
2. 421 views
A team has been working to convert diesel-powered cars to run just as efficiently on used cooking oil! They want to compare the
1. 1 answer
2. 752 views
Part of a circuit has two resistors connected in parallel as shown in the figure. R(1) is a constant resistor of 10 ohm, while
1. 1 answer
2. 697 views
Using L'Hôpital's rule, evaluate lim of xe^(-x) as x approaches infinity
1. 1 answer
2. 1,018 views
Find the average value of the functionf(x) = (2x - 5)^2 on the interval [1, 2].
1. 0 answers
2. 370 views
In what ways can sea level be lowered? What effect might this have on existing life forms?I can't find it in my textbook. Can
1. 0 answers
2. 443 views
How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to
1. 5 answers
2. 1,799 views
A 6 µC charge is placed at the origin and a secondcharge is placed on the x-axis at x = 0.34 m. If the resulting force on the
1. 1 answer
2. 1,887 views
Since the oxidation number of Chromium is +3, and the oxidation number of Silicon is -4. Why is the chemical formula for
1. 1 answer
2. 886 views
Oxygen has a boiling point of 90K, and nitrogen has boiling point of 77K. Which is a liquid and which is a gas at 80K?I tried to
1. 2 answers
2. 1,627 views
How did math originate?
1. 1 answer
2. 483 views
need to create a number system using only: A=1, B=2, C=3, D=4 and Zero=0. Help
1. 2 answers
2. 357 views
Find the supplement to the angle whose measure is 85 degrees.
1. 1 answer
2. 549 views
How does shelly keep mystery and terror along with supernatural elements in chapters 8-10
1. 1 answer
2. 796 views
The number of a fraction is three more than twice the denominator. The fraction simplified is equal to 9/4 Find the fraction
1. 0 answers
2. 477 views
find the height from which you would have to drop a ball so that it would have a speed of 9.0 m/s
1. 1 answer
2. 1,868 views
I'm supposed to come up with something in the imparfait that begins with "Quand j'étais petite, ... but my vocabulary is very
1. 1 answer
2. 453 views
The structural technique that includes long vertical studs running from the sill plate to the second floor roof frame is called
1. 4 answers
2. 703 views
The key diplomatic achievement of Bismarck's foreign policy was
1. 3 answers
2. 392 views
I am very confused about hybridization in general. Please give an explanation on how to do this.Which of the following pairs of
1. 1 answer
2. 1,082 views
A woman has 11 close Friend. Find the number of ways she can invite 5 of them to dinner ifa. but where 2 of the friends are
1. 3 answers
2. 5,012 views
Question 1:There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students
1. 3 answers
2. 6,929 views
Question 1:There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students
1. 0 answers
2. 1,085 views
A quantity of 0.020 mole of a gas initially at 0.050 L and 20 degrees Celsius undergoes a constant-temperature expansion until
1. 1 answer
2. 1,122 views
The melting point of aspirin : 128-137Celsius degree.The melting point of the crude aspirin was measured to be 128 Celsius
1. 1 answer
2. 2,320 views
8x-(2x+7)=23I am completely drawing a blank as to how I am suppose to solve this. Can someone offer the first step?
1. 1 answer
2. 365 views
8x-(2x+7)=23
1. 1 answer
2. 295 views
The balance sheets of Petrello Company and Sanchez Company as of January 1, 2011, are presented below. On that date, after an
1. 1 answer
2. 1,579 views
The circumference of a circle is approximately 28.26 cm. Find its diameter and radius
1. 9 answers
2. 3,182 views
0.5123 g KHP sample was dissolved in about 25 mL of distilled water, and titrated to the phenolphthalein endpoint with 28.75 mL
1. 1 answer
2. 1,781 views
the shower is the story in line 1-4 the speaker usesa metaphor to compare the twilight to
1. 1 answer
2. 625 views
How do you come up with the starting cost, plus a budget for a new Day Care Center. How do you come up with a estimate of the
1. 3 answers
2. 475 views
A tank in the shape of a cone has a diameter of 8 feet and a height of 10 feet.when there is water in the tank, th water is in
1. 1 answer
2. 691 views
Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the
1. 1 answer
2. 906 views
A particular coal contains 2.55% sulfur by mass. When the coal is burned, it produces SO2 emissions which combine with rainwater
1. 1 answer
2. 1,030 views
HF acid ionization constant (Ka) is 3.5 X 10-4. In a solution of HF acid @ equilibrium [H+] = 0.090 M. What is the concentration
1. 1 answer
2. 569 views
25.0g of 5.0% (by mass) acetic acid solution are titrated with 0.300 M NaOH. What volume of NaOH will be needed to neutralize
1. 1 answer
2. 1,158 views
If 24.7 of 0.250 M NaOH solution are needed to neutralize 19.8 mL of H2SO4 solution, what is the molarity of the H2SO4?
1. 1 answer
2. 1,326 views
A 5-mile cab ride costs $9.30. A 11-mile cab ride costs $17.70. Find a linear equation that models cost c as a function of
1. 1 answer
2. 1,065 views
A 3-mile cab ride cost $3.00. A 6-mile cab ride cost $4.80. Find a linear equation that models cost c as a function of distance
1. 1 answer
2. 829 views
The sum of Lisa's and Jack's scores on there first algebra test is 6 less than twice Lisa's score. What is the lowest possible
1. 1 answer
2. 469 views
Find the derivative. Could you please show me the steps?y = �ãx(5-�ãx)
1. 1 answer
2. 478 views
What follows is a hypothetical situation. Genes that produce chlorophyll in plants are inserted into the chromosomes of cattle.
1. 1 answer
2. 646 views
What was the impact of John D. Rockefeller on American industry?
1. 1 answer
2. 650 views
an open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its 4 corners. Find
1. 3 answers
2. 9,301 views
what makes an authors argument compeling
1. 2 answers
2. 400 views
just a few quick communication questions...1-is it possible to have total internal reflection for light incident from air onto
1. 1 answer
2. 600 views
You exert a force of 455N in pulling 15.0m of rope using a pulley system to lift a 935N object 5.0m. What is the efficiency of
1. 2 answers
2. 2,054 views
I've got a few communication questions...-Why do images appear sharper underwater when wearing a diving mask? -where would you
1. 1 answer
2. 356 views
calculate the image position and magnification for an object 3cm tall laced in front of mirror with a focal length of 12cm, if
1. 2 answers
2. 853 views
1-A tunning fork has a frequency of 440Hz. The string of a violin and this tuning fork, when sounded together, produce a beat
1. 2 answers
2. 1,373 views
What is subject-verb or pronoun-antecedent for this sentence:Not one of our tomato plants are producing any fruit, but the
1. 2 answers
2. 1,069 views
I need to find 4 children songs/lyrics in between the copyright date of 2004-2009. I have search the Internet 4 days and I have
1. 1 answer
2. 628 views
Relax. The kid's been delivering the paper for, how long? Three, fouryears maybe? And not once has she missed us. The paper will
1. 2 answers
2. 473 views
Following the nutritional label on a jar of peanut butter, you determine that 1 once of the peanut butter contains 115 calories
1. 2 answers
2. 1,219 views
Which one of the following lunches provides in both color and texture?A.Egg salad sandwhich,applesauce,celery hearts,milk. B.Egg
1. 3 answers
2. 561 views
5.) A child in your program has just returned after having chickenpox. You notice that she still has a few dry scabs. What
1. 2 answers
2. 442 views
Jamie loves all vegetables, all fresh and dried fruits, and milk. However,he refuses to eat dairy products and meats. Which of
1. 2 answers
2. 440 views
Why shouldn't unmodified cow's milk be given to an infant under one year old?A.Infants are able to digest only breast milk. B.It
1. 3 answers
2. 806 views
Laura won't drink milk or eat cheese,but she does drink juices and eat fruit.She loves bread and eats sliced meat
1. 2 answers
2. 544 views
To assure children's safety in a child care setting,teachers must provide continuousA.elimination of all risks and hazards in
1. 2 answers
2. 505 views
Which of the following statements encourages appropriate use of playground equipment?A. "I told you not to go down the slide
1. 2 answers
2. 493 views
Why is the incubation stage of an illness of concern to day care workers?A.Children in this stage require a great deal of care
1. 3 answers
2. 1,068 views
Why shouldn't unmodified cow's milk be given to an infant under one year old?A.Infants are able to digest only breast milk. B.It
1. 4 answers
2. 1,148 views
According to the food pyramid, a child should have a total of ----- cups of milk or the equivalent from the milk, yougart, and
1. 3 answers
2. 521 views
The leading cause of death and permanent disabilities due to untentional injury isA.drowning B.falls C.poisoning D.automobile
1. 3 answers
2. 441 views
Which of the following statements regarding exclusion policies is true?A.They prevent illness and infection in centers B.They're
1. 2 answers
2. 518 views
A teacher is in a prime position to observe children becauseA.the teacher sees children in relation to other children of the
1. 2 answers
2. 1,752 views
Of the following, which action by a teacher is the most appropriate and useful?A.Diagnosing smallpox B.Recording a child's rash
1. 2 answers
2. 565 views
Which one of these categories would most likely be found in the operating budget of a day care center?A. Tables and chairs for
1. 2 answers
2. 497 views
If an employer fails to pay state unemployment taxes on a timely basis, the rate on FUTA taxes willA. remain the same B.be lower
1. 2 answers
2. 414 views
Why must parents be involved in their child's day care program when it's sponsored by the government?A.Parent involvement
1. 3 answers
2. 535 views
You're trying to plan an activity for your third graders, who will be arriving around 2:30 in the afternoon. Today you want to
1. 3 answers
2. 428 views
If an employer fails to pay state employment taxes on a timely basis, the rate on FUTA taxes willA.remain the same B.be lower
1. 0 answers
2. 406 views
If an employer fails to pay state employment taxes on a timely basis, the rate on FUTA taxes willA.remain the same B.be lower
1. 1 answer
2. 430 views
Child care staff are most effective during science activities when theyA.encourage convergent thinking B. answer questions as
1. 4 answers
2. 486 views
Melissa plays with the same four girls everyday.She has a lot of energy, is independent, and is concerned about what her friends
1. 5 answers
2. 635 views
You're a teacher in an area day care center. Before your children arrive each morning, you set up several areas with a variety
1. 2 answers
2. 457 views
When properly executed, the behavior management strategy known as time-out becomesA.a positive reinforcer B.more effective than
1. 8 answers
2. 634 views

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