Friday
February 5, 2016

Posts by drew

Total # Posts: 262

chemistry
Lithium-6 has an atomic number of 3. How many electrons are in this isotope? A. 0 electrons B. 3 electrons C. 6 electrons D. 9 electrons I think C. 6
November 19, 2012

chemistry
Lithium-6 has an atomic number of 3. How many protons are in this isotope? A. 0 protons B. 3 protons C. 6 protons D. 9 protons I think 3
November 19, 2012

chemistry
boron-10 has an atomic number of 5. how many electrons are in this isotope? 0 electrons, 2 electrons, 5 electrons, 10 electrons. I think 10
November 19, 2012

chemistry
boron-10 has an atomic number of 5. how many neutrons are in this isotope? 0 neutrons, 2 neutrons, 5 neutrons, 10 neutrons. I say 5
November 19, 2012

chemistry
the idea of the atom was first proposed by john dalton. true or false false
November 19, 2012

chemistry
Actinides and Lanthanides are elements in group 3A. true or false I say false
November 19, 2012

chemistry
Lithium-6 has an atomic number of 3. how many neutrons are in this isotope? A. 0 neutrons, B. 3 neutrons, C. 6 neutrons, D. 9 neutrons I say B
November 19, 2012

Math for Ms. Sue Or Steve
Ms Sue, stop it with the insults! Thats not cool!
November 14, 2012

chemistry
guessed
November 10, 2012

chemistry
meant A
November 10, 2012

chemistry
What is the molar mass of hydrogen? A. 1.01 g/mol B. 11.01 g/mol C. 101.1 g/mol D. .0111 g/mol D
November 10, 2012

chemistry
How many atoms are in 3.14 mol of methane (CH4)? A. 7.56 x 1023 atoms B. 7.56 x 102 atoms C. 7.56 x 104 atoms D. 7.56 x 1024 atoms D
November 10, 2012

chemistry
What is a problem-solving technique that uses equivalent measurements in ratio form to solve problems? A. Avogadro's number B. Conversion C. Dimensional analysis D. The mole concept A
November 10, 2012

chemistry
In order to determine the number of atoms in a compound, you must know the number of atoms in a representative particle of the compound. True False i think false
November 10, 2012

chemistry
How many moles are in 4.81 x 1024 atoms Na? A. 0.799 mol Na B. 7.99 mol Na C. 481 mol Na D. 7.99 x 10-1 mol Na B
November 10, 2012

chemistry
How many atoms are in 1.14 mol of propane (C3H8)? A. 7.55 x 1023 atoms B. 7.77 x 1024 atoms C. 7.55 x 1024 atoms D. 7.55 x 1030 atoms C
November 10, 2012

chemistry
How many moles of magnesium is 1.25 x 1023 atoms of magnesium? A. 0.208 × 101 mol Mg B. 2.08 × 101 mol Mg C. 2.08 × 10 -1 mol Mg D. 20.8 mol Mg I think it would be D
November 10, 2012

chemistry
What is the gram molecular mass of C2H6? A. 8.0 g B. 30.0 g C. 40.0 g D. 50.0 g think B
November 10, 2012

chemistry
What is the gram fomula mass of calcium carbonate (CaSO4)? A. 6 g B. 136.2 g C. 230.0 g D. 235.4 g think B
November 10, 2012

chemistry
thank you
November 10, 2012

chemistry
The chemical explosive nitroglycerine has the formula C3H5(NO3)3. How many oxygen atoms are in the formula unit for this compound? A. 3 B. 6 C. 9 D. 12 C. 9
November 10, 2012

chemistry
The water molecule (H2O) is composed of 2 atoms of hydrogen and one atom of oxygen. What is the mass of one mole of water? A. 3 g B. 18 g C. 6 g D. 6.02 x 1023 g B. 18 g
November 10, 2012

math
On a cold winter day, the temperature is -10.0º C. What is the reading on the Fahrenheit scale? A. 10.0 oF B. 12.0 oF C. 13.0 oF D. 14.0 oF I say A
November 7, 2012

math
The temperature of the water around a nuclear reactor core is about 300 oC. what is this temperature in degrees Fahrenheit? A. 27 oF B. 332 oF C. 572 of D. 573 oF I say D
November 7, 2012

math
Solve the following and express the answer in scientific notation: (5.4 x 10^4) x (4.5 x 10^8) A. 2.4 x 10^10 B. 24 x 10^11 C. 24 x 10^12 D. 2.4 x 10^3 I say D
November 7, 2012

Science
The "resistant" threshold for gemifloxacin is >1 mg/L while the "resistant" threshold for sulfamethoxazole is >512 mg/L. Explain why there might be this great disparity of values in resistance thresholds (512-fold) for each antibiotic ...
November 6, 2012

physics
thanks, but how come m is not in kg?
October 3, 2012

physics
Just an explanation without numbers would be awesome, i just want to understand the correct steps to take. Thanks!
October 3, 2012

physics
Ice fishing equipment weighing 3,000 N is pulled at a constant speed V = 0.5 m/s across a frozen lake by means of a horizontal rope. If the coefficient of kinetic friction is 0.05, what is the work done (in J) by the fisherman in pulling the equipment a distance of 500 m?
October 3, 2012

Chemistry
got it thanks!
September 19, 2012

Chemistry
Another hour gone by working on this and i still can't figure it out. Im totally lost!
September 19, 2012

Chemistry
A mixture of ethane and ethene occupied 35.5 L at 1.000 bar and 405 K. This mixture reacted completely with 110.3 g of O2 to produce CO2 and H2O. What was the composition of the original mixture? Assume ideal gas behavior Im pretty sure i use dalton's law of partial ...
September 19, 2012

Physics
A tennis ball is thrown horizontally from an elevation of 20.60 m above the ground with a speed of 19.0 m/s. (a) Where is the ball after 2.00 s for the horizontal and vertical position? (b) If the ball is still in the air, how long before it hits the ground? If the ball is ...
September 13, 2012

Math
Fiind the area bounded by the parabola y^2 = 8x, the x axis and the line x=2
August 21, 2012

Physics
a quarter sits at the bottom of a wishing well where the gauge pressure reads 294 kPa. If the quarter has a diameter of 24mm, what is the total force acting on the top surface of the quarter? Note: Atmospheric pressure = 101.3
August 20, 2012

Calculas
square root of 2x
July 24, 2012

Calculas
Find the length of the curve y=ã(2x), from x=1 to x=4.
July 24, 2012

chemistry
Nitrogen-13 has a half-life of 10 minutes. Given a starting mass of 2.00 g of nitrogen-13, how many grams will remain at the end of 30 minutes?
June 19, 2012

chemistry
What is the molarity of the solution produced when 14.1 grams of ammonia is dissolved in sufficient water to prepare .100 liters of solution?
May 22, 2012

calculus
yes, i pretty sure i got it as my answer mathes the back of the book
April 23, 2012

calculus,1
we got a few examples in class but not understanding it at all
April 23, 2012

calculus
Can someone please show steps as I am having a hard time understanding. The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.
April 23, 2012

calculus,PSS
help
April 23, 2012

calculus
This is just for study for exam coming up and says it could be worth up to 12 marks. Not understanding vry well the two
April 23, 2012

calculus
The position (in meters) of a particle is modeled by y=x^3-12.5x^2+51x-67.5, where xis in seconds. Find the max, min and point(s) of inflection.
April 23, 2012

calculus
A balloon is being filled at a rate of 4000 cm^3/min. How fast is the surface area of the ballon increasing when the radius is 125 cm? V=4/3pir^3, SA=4pir^2
April 23, 2012

physics
A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...
April 23, 2012

Physics (Energy and Momentum)
You are given V and are solving for dM/dt what do you set it equal to?
April 17, 2012

physics
what is the wave equation?
April 16, 2012

physics
FM radio signals are electromagnetic waves transmitted between frequencies of 88 MHz and 107 MHz. Find the range of wavelengths for these signals. largest___m smallest___m
April 16, 2012

calculus
Use Newtons method to find the roots of the equation 1/x=1+x^3
April 4, 2012

Algebra 2
Hi I need help. Can you show me how to solve this problem? Radical Inequalities. -2 + square root 9-5x greater than or equal to 6
April 3, 2012

trig
Find the other endpoint of the line segment with the given endpoint and mid point. 1. Endpoint:(-1, 9), midpoint: (-9, -10) 2. Endpoint: (2, 5), midpoint: (5, 1) 3. Endpoint:(9, -10), midpoint: (4, 8)
March 28, 2012

Math
Find the discriminant. Tell which conic section the graph will be. 3x^2 + 12 xy + 9y^2 + 7x -2y - 100
March 11, 2012

managerial economics
Qd=15.0-0.2P where Qd is annual quantity demanded in millions of units and P is the wholesale price. Incurred cost of $60 million. Production cost is $5/unit. (1) what is wholesale price, (2) production annually, (3) annual profit? Given this is a monopoly with an expiring ...
February 29, 2012

trig
does sec(x)tan(x)*tan(x)=[sec(x)(tan^2)x]
February 23, 2012

chemistry
what are three common ores from which copper can be extracted
February 22, 2012

geometry
How tall is a tower if it casts a shadow 65 ft long at the same time that a building 160 ft tall casts a shadow 130 ft long?
February 16, 2012

Algebra
How do you solve: (2x+1)(x-4)=0
February 1, 2012

Language
thank you
January 30, 2012

Language
yes
January 30, 2012

Language
3 disadvantages for town crying
January 30, 2012

chemistry
A solution was made by dissolving 10.0g of a nonvolatile nonelectrolyte compound in 100.0g of water froze at -0.93C. What is the approximate molecular weight of the substance. (for water..kf=1.86C/m) (m is molality)
December 12, 2011

chemistry
D=[mol.wt*P)/(R*T) D=(29.0 g/mol*0.97atm)/[(0.0821 atm*L/mol*K)*(303.15 K)] =1.13 g/L
December 12, 2011

calculus
Given f''(x)=5x−6 and f'(−3)=−6 and f(−3)=2. find f'(x) and f(1)
November 19, 2011

physics
A missile's trajectory takes it to a maximum altitude of 1300Km. If its launch speed is 5.9 Km/s, how fast is it moving at the peak of its trajectory? answer is in Km
October 20, 2011

Physics.. please help!!!!!
The third question is wrong...
October 20, 2011

physics
2.16km
September 17, 2011

Math Help
700-284=?
September 13, 2011

Physics
A frog in a hemispherical bowl, as shown below, just floats in a fluid with a density of 1.26*10e3 kg/m3. If the bowl has a radius of 6.16 cm and negligible mass, what is the mass of the frog?
June 28, 2011

business
Specialization
April 20, 2011

social studies
vgvg,c
March 24, 2011

social studies
describe 2 details about the life of the Incas
March 19, 2011

math
Jeff is thinking of a function machine.He says that the output is 5 when the input is 4.What are two different rules that he could be thinking of.
March 10, 2011

physics
train is approaching the station at a speed of 20m.s sounds a 220 hz horn. What frequency does an observer on the station platform hear
February 28, 2011

physics
What do we know? r=6.38x10^6m T=1 day=86,400s Part A: T=2(pi)r/V ==> V=2(pi)r/T a=V^2/r (Plug & chug) Part B: Now, what do we know? Only T=1 day=86,400s. We no longer know r. Latitude we'll say is represented by "l". So r(l) = r cos l Once you find that radius...
February 23, 2011

ESSAY NEED HELP PLEASE
I would help but I'm working on one now
January 24, 2011

Physics
A car is approach a corner too fast and locks up the brakes at point A and holds them on for 12.5 M to point B. The car then moves from point B at a constant speed and does into the corner. At Point C because the car is still going to fast it goes out of control and leave the ...
January 20, 2011

chemistry
What products are formed when sucrose is heated in an aqueous sulfuric acid solution? What role does the acid play?
January 16, 2011

math
HELP ME!!! One of your friends missed the class on scientific notation. Describe how you would explain to your friend what it means for a number to be in scientific notation and how to convert a number from standard form to scientific notation.
January 10, 2011

math
its =
January 10, 2011

math
|60|___|-60| < > =
January 10, 2011

physics
4ooN per second
December 15, 2010

calculus
Let R be the region in the first quadrant bounded by the graphs of y=e^-x, y=1/2x+1, and x=2. Then find the volume of the solid when R is revolved about each of the following lines... the x axis, y=-1, y=2, the y axis, x=-1, and x=3.
December 15, 2010

Chem
H2SO4(aq) + Ba(NO3)2(aq) = BaSO4(s) + 2HNO3(aq) overall heat gen by reaction answer is supposed to be -659.3 but I keep coming up with something else.
December 14, 2010

Math 8th grade
.02(2X-3)-0.03(3x(.2)=-.02
December 12, 2010

Calculus
I got x=10/3 and x=6
November 16, 2010

Calculus
Find the x-coordinates of all points on the graph of y = x^3 - 4x^2 + 5x at which the tangent line is parallel to 2y - 10x - 7 = 0
November 16, 2010

Calculus
Thanks
November 16, 2010

Calculus
Find the x-coordinates of all points on the graph of y=x^3 - 4x^2 + 5x at which the tangent line is horizontal.
November 16, 2010

The Crucible Crossword Puzzle question
Bitter
October 30, 2010

physics grade 11
A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer requires me to use ...
October 17, 2010

physics grade 11
A 4.3 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.8 m/s2 . If the upward acceleration of the bucket is 4.6 m/s2, find the force exerted by the rope on the bucket. Answer in units of N. I'm almost sure the answer requires me to use ...
October 17, 2010

physics
Why do we not need to convert N into kg?
October 13, 2010

Chemistry
How many milliliters of 0.230 M Na2S2O3 solution are needed to titrate 2.349 g of I2 according to the equation below? I2(aq)+2S2O3^2-(aq)->S4O6^2-(aq)+2I^1-(aq)
October 6, 2010

Chemistry
I have the same question and that's all the information that it gives
September 28, 2010

biology
Are all mixtures solutions? Are all solutions mixtures? Give an example.
September 9, 2010

Fundamentals of Cost Analysis (Economic Analysis)
1431926
August 19, 2010

Chemistry
It is difficult to type these but I'll do my best. This is the first question and I just don't get it. My professor is out of the country so any help would be appreciated. Give the IUPAC name for each of the following alkanes: CH3 I a. CH3--CH--CH2--CH2--CH3 b. CH3 CH3...
July 20, 2010

Chemistry
This is the first in a series of hw pages. If anyone would be able to help me with this one I think I would be able to complete the other 20 hw questions I have. Thanks to anyone that helps. For each definition, find a corresponding term from the following list: alkane,alkene...
July 20, 2010

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