# Questions Asked onSeptember 21, 2013

1. ## Chemistry

Consider the following reaction: 2Fe2O3 --> 4Fe + 3O2 ∆Hrxn° = +824.2 kJ The decomposition of 29.0 g of Fe2O3 results in a. the release of 150 kJ of heat b. the release of 12000 kJ of heat c. the absorption of 12000 kJ of heat d. the absorption of 150

2. ## Chemistry

The standard internal energy change for a reaction can be symbolized as ΔU°rxn or ΔE°rxn. For the following reaction equations, calculate the energy change of the reaction at 25 °C and 1.00 bar. Sn(s) + 2Cl2(g) --> SnCl4(l) ΔH°rxn = -511.3 kJ/mol

3. ## college physics

A rod 14.0 cm long is uniformly charged and has a total charge of -20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C

4. ## Science

Family Smith is interested in buying a solar energy system. After some search on internet they have found two different systems that they are considering. System A is a PV system based on multicrystalline silicon solar cells and System B is a PV system

5. ## Chemistry stoch1

Calculate mass of iron, which will be converted into (Fe3O4) by the action of 18g of steam on it.

6. ## math

A researcher was interested in the emotional effects of music on exam performance. Before their exam, a professor took one group of students into a room in which calming music was played. A different group of students were taken to another room in which

Which property is illustrated by the following statement? 2x(6) = (6)2x a. Associative Property of Addition b. Commutative Property of Multiplication (?) c. Inverse Property of Multiplication d. Commutative Property of Addition Which property is

8. ## math

in triangle ABC, AB=6, BC=12 AND AC=X. Which of the following cannot be a value of x? a. 6 b.7 c.8 d.9 e.10

9. ## Chemistry

What is the maximum mass of S8 that can be produced by combining 85.0 g of each reactant? 8SO2 + 16H2S yields 3S8 +16H2O

10. ## chem

Assume that you have 1.41mol of H2 and 3.50mol of N2. How many grams of ammonia (NH3) can you make, and how many grams of which reactant will be left over? 3H2+N2→2NH3

11. ## chemistry

The radius of a aluminum atom is 143 pm. How many aluminum atoms would have to be laid side by side to span a distance of 4.90 mm?

12. ## Algebra

Which property is illustrated by the following statement? (7p)mn = 7p(mn) a. Commutative Property of Multiplication b. Associative Property of Multiplication(?) c. Inverse Property of Multiplication d. Commutative Property of Addition What is the

13. ## Math

An elevator moves at a rate of -5.8 feet per second from a height of 300 feet above the ground. It takes 3 seconds for the elevator to make its first stop. How many feet above the ground is the elevator now?

14. ## Algebra

The perimeter of a basketball court is 108 meters and the length is 6 meters longer than twice the width. what are the length and the width?

32. ## Math

Which sum or difference is equivalent to the following expression? 5-3x --- 5 Is this 1 - 3x/5?

What is the maturity date of Samantha Best’s loan?

34. ## physics

The initial speed of a cannonball is 520 m/s. The acceleration of gravity is 9.8 m/s 2 . The cannon and target are at the same elevation. If the ball is to strike a target that is at a horizontal distance of 2.7 km from the cannon, what is the minimum time

75. ## algebra

I have to find the solution for (fg)(x) f(x)= -6x-1 g(x)=4x^2 can you show steps please

76. ## Math

A new car depreciates as soon as you drive it out of the parking lot. A certain car depreciates to half its original value in 4 years. IF you bought a car 8 years ago, and it's now worth \$5,000, how much did you pay for the car originally?

77. ## algebra

A parallelogram is 22 inches long and 14 inches wide. How do you find the height of the parallelogram? How do you find the area of the parallelogram ?

y/11=3

79. ## Cell Biology

Suppose 1.00 ml of blood from a given donor contained 5 X 106 red blood cells and the donor’s hematocrit were 48%. Determine the surface area that the lipids extracted from the plasma membranes of red blood cells obtained from 10.0 ml blood would occupy

80. ## college physics

In the Bohr theory of the hydrogen atom, an electron moves in a circular orbit about a proton, where the radius of the orbit is approximately 0.542 multiplied by 10-10 m. (The actual value is 0.529 multiplied by 10-10 m.) (a) Find the electric force

-22+y=y/-14

82. ## algebra

Can someone help me with steps showing select approximate value of x that are solutions to f(x)=0 f(x)=-7x^2 + 5x + 9

83. ## algebra

-22x + 11y +55z =

84. ## english

There was no danger, difficulty, or that could ponce de leon from venturing into the jungles of florida to search for the fountain of youth. a= obstructuion...deter b=procrastination... subside i know the definitions its to hard i think its b

85. ## Chemistry

A sample of glucose, C6H12O6, contains 5.1x10623. a.)How many atoms of hydrogen does it contain? b.)How many molecules of glucose does it contain? please help me. :(

86. ## Chemistry

A sample of glucose, C6H12O6, contains 5.1x10623. a.)How many atoms of hydrogen does it contain? b.)How many molecules of glucose does it contain? please help me. :(

87. ## PURE MATHEMATICS

5) find the complex number z and w such that z+w=4+3i and z-iw=3-2i

88. ## Bus/475

why should core values remain relatively constant.

89. ## triangles (math)

BO and CO are respectively the bisector of angle b and angle c triangle ABC.AO produced meets BC at P, then find AB/AC.

90. ## ENGLISH (ESL)

please need proof Reading Health promotion means what you can do to reduce the health risks and promote the wellness of a human being. This process directed towards enabling people to take action and support them in changing their lifestyle to move toward

91. ## math

Order: Furosemide 40mg IV push every 12 hours x 3 days. have 50 mg dont clue how to do this .

92. ## English

what is the Past Present and future for carry

93. ## socials

An extension to my other question- how did oliver cromwell like impact the world and why was he significant? It could relate to if he had high moral principles. I wrote my essay but I don't know how to close it up.

94. ## polynomials

can someone please help me with this problem I have to get the sum diff and product I keep trying to work it out but i really think im blowing it. x^3- ¡¼2x¡½^2 + 3x-1 ¡Ã x^2- x+4

95. ## Chemistry

When electrons get excited can they only move up one level or can they go up multiple orbitals, but just one at a time.

96. ## physics

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.16 m. The stones are thrown with the same speed of 8.67 m/s. Find the location (above

97. ## Algebra

Is -7 + 9 = -9 + 7 true, false, or open? a. true b. false (this one?) c. open Is 4x - 3 = 19 true, false, or open? a. true b. false c. open (this one?) Which of the following is a solution to the equation 16 = 4x - 4? a. -5 b. -4 c. 5 (this one?) d. 16

98. ## polynomials help me please

Im sorry here is the problem rewritten X^3 -2x^3 + 3x-1 : X^2-x+4 I have to get the sum diff and product and it kicking my tail i think i keep doing it wrong can someone please help me

99. ## math

The variable n represents a whole number. a. For what values of n will the sum of n+3 be less than 50? b. For what values of n will the product 3n be less than 50?

An important factor of being judged a best company to work for is the input provided by company employess.

101. ## statistics

if a toaster ovens hav an average life expectancy of 9.5 years with a standard deviation of 4.75 years. what is the probability that a toaster oven will last twenty years or will fail in one year or less?

102. ## Englsih

Please edit this writing. There are several errors in this writing. People take out oil from the sands in AB so we can drive and leave tailings ponds. This caused a lot of damage to the land and negative impacts to wildlife. Natives get sick from eating

103. ## English

Please edit this writing. There are several errors. Also, evaluate the writing, style, spelling and content of this writing piece. The Alberta oil sands are being developed at an unprecedented rate for oil extraction. Consequently there is a great deal of

104. ## English

Please evaluate the writing, grammar, style, spelling as well as content. People take out oil from the sands in AB so we can drive and leave tailings ponds. This caused a lot of damage to the land and negative impacts to wildlife. Natives get sick from

105. ## statistics

if anxiety scores were recorded as Z score or 1.10, is that higher than 35 in the current study?

106. ## math

If f (x,y)= x-y+3, What is f (f (6,4), 2)? A. 12 B. 11 C. 6 D. 3 E. 2

107. ## Chemistry

What is the energy of a bond formed between a potassium (K+) cation and an iodide (I−) anion? The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10

108. ## Chemistry

Calculate the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7.

109. ## Math

In a certain Library, there are r bookcases with s shelves in each book case. If a total of b books is to be distributed among the shelves, What is the number of books per shelf? a) b/rs b) rb/s c) rsb d) r/s-b e) b/s-r

110. ## Statistics

2. A researcher hypothesized that the pulse rates of long-distance athletes differ from those of other athletes. He believed that the runners’ pulses would be slower. He obtained a random sample of 10 long-distance runners. He measured their resting

111. ## Algebra

Two cyclists leave towns apart at the same time and travel toward each other. One cyclist travels slower than the other. If they meet in hours, what is the rate of each cyclist?

112. ## math

The average of 20,70 and x is 40. If the average of 20,70, x and y is 50, then y= a. 30 b. 60 c. 70 d. 80 e. 100