Sunday

December 4, 2016
Total # Posts: 545

**Chemistry**

How many mL of 0.100 M NaOH are required to neutralize (or titrate) 25.0 mL of 0.15 M H3PO4?

*December 1, 2016*

**math**

Jenifer jogs at the rate of 3 3/4 miles per hour. How far does she jog in 1 5/6 hours?

*November 8, 2016*

**Chemistry 1**

Use the equation Q = mc?T Q =(m)(c)(?T) =(22.0g)(4.184J/g°C)(75°C) =6903.6J =6900J (if you need to round to nearest sig fig) Hope this helps!

*November 2, 2016*

**biology**

Quick Answer: "I" Explanation: Since you're forming an iconic bond, you want to get the total valance electrons to 8. Elements under 1A all have 1 valance electron, so all you really need to do is find an element with 7 electrons which under VIIIA column(7th ...

*November 2, 2016*

**physical chemistry**

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?

*October 31, 2016*

**Chemistry**

Consider an ionic compound, MX2, composed of generic metal M and generic, gaseous halogen X. The enthalpy of formation of MX2 is ΔHf° = –799 kJ/mol. The enthalpy of sublimation of M is ΔHsub = 157 kJ/mol. The first and second ionization energies of M are IE1...

*October 31, 2016*

**physics**

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?

*October 30, 2016*

**chemistry**

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?

*October 30, 2016*

**physics**

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.

*October 30, 2016*

**chemistry**

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.

*October 30, 2016*

**chemistry**

For each pair of compounds, predict which species will have the higher molar entropy at 298 K and 1 bar. Be sure to state your reasons for your choice. 1. N2(g) vs. F2(g) 2. ICl (g) vs. BrF(g) 3. 6Li(s) vs. 7Li(s)

*October 24, 2016*

**Calculus**

I want to know how to find the local linearization. So in this problem I'm doing, I'm given the f(x) equation and it says "about x = 0" I'm suppose to approximate value of f(0.3) Are there specific steps I need to take to go about this problem?

*October 10, 2016*

**Algebra**

Can someone help me with this equation? The length of a rectangle is (2x+3) and the width is (x-6). Write the equation and solve to find the value of x if the perimeter of the rectangle is 90 centimeters.

*September 8, 2016*

**Math**

Would it be two? Since HHT and HTH? or HHT, THH, Hth? Thanks

*September 4, 2016*

**Math**

Use a tree diagram or systematic list to determine the number of ways a nickel, a dime, and a quarter can be flipped to get exactly one tail.

*September 4, 2016*

**math**

The gradient of a curve at (1,-11) is ax^2 + b at all points. The tangent at (2,-16) is parallel to the x-axis. Find a and b and the equation of the curve

*June 21, 2016*

**Math**

A class of 23 students was using square tiles to build rectangular shapes. Each student had more than 1 tile and each had a different number of tiles. Each student was able to build only one shape of rectangle. All tiles had to be used to build a rectangle and the rectangle ...

*June 20, 2016*

**trade science **

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

*June 6, 2016*

**trade science **

Co-efficient of cubical expansion

*June 6, 2016*

**trade science **

Final length of the bar of copper whose original length was 75mm When heated through 50 degrees

*June 6, 2016*

**math**

a girl walks 800 m on a bearing of 129 degrees.calculate how far east and south she is from her starting point.

*May 16, 2016*

**math**

the brown family boarded a train at 3:55 P.M. to go home from the county fair. it took them 25 minutes to get to the train station from the fair. they spent 75 minutes at the fair. what time did they arrive at the fair

*May 4, 2016*

**math**

the volume of a rectangular prism is 2,058 cm3. The length of the prism is three times the width. The height is 14 centimeters. Find the other dimensions

*April 13, 2016*

**math**

most unsharpened pencils are hexagonal prisms. describe a vertical and horizontal cross section of a pencil

*April 13, 2016*

**Math**

Trying to find the volume of a rectangle. The lenght is 8/9 the wideth is 1/6 and the height is 1/3. And can't seem to solve the problem. Can you please help

*April 11, 2016*

**Math**

What is the ratio in fraction form for 9 pints to 2 quarts

*April 10, 2016*

**english**

what is the meaning of the Root bell

*March 14, 2016*

**Physics**

An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?

*March 7, 2016*

**Chemistry**

An interference filter is to be constructed for isolation of the nitrobenzene absorption band at 1537 cm-1. (a) If it is to be based on first-order interference, what should be the thickness of the dielectric layer (refractive index of 1.34)? (b) What other wavelengths would ...

*February 26, 2016*

**Chemistry**

For the gratings (84.0 lines per millimeter and 15.0 mm of illuminated area) calculate the wavelengths on the first and second-order diffraction spectra at reflective angles of (a) 20 degrees and (b) 0 degrees. Assume the angle of incidence is 45 degrees.

*February 26, 2016*

**physics**

weights of man 10kg and 8kg are placed near p and q respectively one each end of the beam calculate the Reactions at p and q. [1kg is 10N]

*February 21, 2016*

**physics**

a uniform beam 6.0m long and weighing 4kg on support of p and q placed let and right 1.0m from each end of the beam

*February 21, 2016*

**math**

find the hidden question. single load cost $2 and double load cost $4

*February 10, 2016*

**Math**

11 + 2z= 14.78 Find the variable

*January 27, 2016*

**Math**

14 + y/8 = 10 What is the variable?

*January 27, 2016*

**Math**

d = 31 Thank you Ms. Sue

*January 27, 2016*

**Math**

13+d=44 What does the variable represent

*January 27, 2016*

**Math**

5/6 (2g+1)-g Simplify the expression

*January 27, 2016*

**Math**

Thank you

*January 27, 2016*

**Math**

Two even integers are represented by 2n and 2n+2. Explain how you can find the value of those integers if their sum is 14. Name the integers.

*January 27, 2016*

**chemistry (moles)**

2.5g of a mixture of anhydrous BaOH and BaCl2 was dissolved in distilled water and made up to 250cm3. 20cm3 of this solution required 19cm3 of 0.1moldm3 of dilute nitric acid for complete reaction. Calculate the percentage by mass of BaCl2 present in the mixture. The answer is...

*January 21, 2016*

**Math**

A percentage that represents the yearly increase in prices of things you buy is called

*January 15, 2016*

**MATH**

You are asked to calculate the weight that a hotel elevator can safely carry. You should expect your answer to be

*January 14, 2016*

**math**

Mr. Dunn drives a 12 mile round trip 3 times a week to the dog park. How many miles does he drive?

*January 12, 2016*

**Math**

Exponetial Functions In the following exponential relations, solve for x using logarithms. Round your answers to 4 decimal places. a) 5^3x=65 b) 2^2x+3=80

*December 31, 2015*

**maths physics chemistry**

State the principle on which each of the following is based. (a) the equation of continuity, Av = constant (b) the Bernoulli equation

*December 29, 2015*

**Math**

If the temperature was -10F and dropped by 16F what would the temperature be?

*December 16, 2015*

**Trigonometry**

An automobile tire has a diameter of 36 inches. How many revolution will the wheel make as the automobile travel 1 mile

*December 15, 2015*

**Physics**

Bill is moving a crate of mass 35 kg up a ramp that forms a 25 degree angle with the horizontal to a height of 5 m. A) If the ramp is frictionless, how much work must Bill do in pushing the crate to the top? B) How much work does gravity do as Bill pushes the crate up the ramp?

*December 13, 2015*

**Chemistry**

At the start of a road trip, the pressure of the air in a car tire is 276kPa and the temperature is 12.0 degrees Celsius. After driving for some time the pressure in the tire is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...

*December 5, 2015*

**Physics**

At the start of a road trip, the pressure of the air in a car tyre is 276kPa and the temperature is 12.0 degrees celsius. After driving for some time the pressure in the tyre is now 303kPa. Assuming that the volume of the air inside the tire remains constant, determine the new...

*December 5, 2015*

**Physics**

Assume the gas is diatomic, calculate how much heat was added to the gas in the process. One mole of ideal gas initially at a temperature of Ti=0 Celsius undergoes an expansion at a constant pressure of 1.00 atm four times its orginal volume

*November 29, 2015*

**Math**

Thanks. It was 12.5

*November 12, 2015*

**Math**

A Gardner adds 3.5 oz of plant food to 2 gallons of water. The amount he was supposed to add is 4 oz. what is the percent error in mixing the plant food

*November 12, 2015*

**Physics**

A spaceship of mass 2.1×10^6 kg is cruising at a speed of 5.0×10^6 m/s when the antimatter reactor fails, blowing the ship into three pieces. One section, having a mass of 4.8×10^5 kg , is blown straight backward with a speed of 2.3×10^6 m/s . A second ...

*November 11, 2015*

**Science **

Concentrated phosphoric acid is 90% by mass and the remaining mass is water.The molarity of phosphoric acid in 90% is 12.2M at rtp. a)What is the density of the solution at rtp ? b)What volume (in mL)of this solution is needed to make a 1.00L solution of a 1.00M phosphoric ...

*November 11, 2015*

**math**

if a bill is $53.00 tax is 6% and tip is 20% what is the total bill

*November 4, 2015*

**math**

if I invest $5000.00 in an account earning simple interest After 6 years the balance is $6,200. What is the interest rate

*November 4, 2015*

**Math**

If the value of a car decreased by 10 percent and is now worth $ 21,000. What was the original cost of the car?

*October 27, 2015*

**Math**

Thank you Ms Sue. You were a big help

*October 27, 2015*

**Math**

Can you show me the formula

*October 27, 2015*

**Math**

If a car decreased by 10 percent and is now worth $14,000. What was the original price of the car

*October 27, 2015*

**stats**

The controller for a garage door opener has nine binary switches that can be set to either on or off. How many different total settings can be set on this controller?

*October 26, 2015*

**s v m latehar ( math)**

Mean=Sum of observations/total no: of observations here 50 is the mean therefore sum of the observation=50*100 so the sum will be 5000 when the value is changed from 100 to 110....only 10 is increased... therefore sum of observations will be increased by ten.... 5000+10(note:...

*October 23, 2015*

**Physics**

Michael Jordan has the record for the highest vertical jump at 48 inches (1.22m). While on the ground, he speeds up over a distance of 0.6 m to achieve the necessary launch speed. What acceleration does his legs provide in order to achieve his height? (Hint: you will need to ...

*October 19, 2015*

**Chemistry**

Write a balanced net ionic reaction for the reduction of cupric ion (Cu2+) by hydroxylamine (NH2OH) in acid solution, using the smallest integer coefficients. (Do not include symbols for state of matter in your answer). in order for this to reduce Cu+2 to Cu+, the ...

*October 19, 2015*

**Physics**

If the rope pulling on the leg exerts a 120-N force on it, how massive should be the block hanging from the rope that passes over the pulley?

*October 16, 2015*

**math**

what is the square root of 288 ?

*September 21, 2015*

**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

*September 21, 2015*

**math**

27.00

*September 21, 2015*

**grammar public school rawlakot**

.75

*September 20, 2015*

**Physics**

A projectile of mass 0.413 kg is shot from a cannon, at height 6.8 m, with an initial velocity vi having a horizontal component of 7.5m/s. The projectile rises to a maximum height of ∆y above the end of the cannon’s barrel and strikes the ground a horizontal ...

*September 16, 2015*

**Math**

A man travels to work everyday at a speed of 40km/h using a car and 6km/h by walking. He arrives at his workshop in 25mins. One day his car broke down and he walked three times as far, thereby arriving at the workshop 17mins late. Calculate the distance from his house to the ...

*September 15, 2015*

**Physics**

Part one was answered, thank you. This was Part one:A runner is jogging at a steady 6.2 km/hr. When the runner is 4.9 km from the ﬁnish line, a bird begins ﬂying from the runner to the ﬁnish line at 24.8 km/hr (4 times as fast as the runner). When the bird...

*August 20, 2015*

**Physics**

A runner is jogging at a steady 6.2 km/hr. When the runner is 4.9 km from the finish line, a bird begins flying from the runner to the finish line at 24.8 km/hr (4 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...

*August 20, 2015*

**Mathes**

400000000

*August 18, 2015*

**Regent University **

A point charge of 0.5 is brought to a point a in free space. How much work is required to do this?

*August 2, 2015*

**physics**

the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal

*July 20, 2015*

**uniben/physics**

the length of an aluminum is 76.5cm and that of an iron ruler is 80cm at 0¡ãc. at what temperature will the length of the rules become equal

*July 20, 2015*

**prob&stat**

Both answers of 0.4735 and 0.3686 are wrong. We got 768 cases, 0.3836, still wrong.

*July 12, 2015*

**science**

Net force of 10 newton produces an acceleration of 2mts/sec2 in a body moving over a horizontal surface . What is the mass of the body

*July 8, 2015*

**Adjective**

On number one is some an adjective because it's describing sense? Thank you

*July 7, 2015*

**Adjective**

For number 3 the adjective is three sided and wooden? 4)simple and unusual? 5)unlimited? 6) much and first?

*July 7, 2015*

**Adjective**

Please tell me the adjectives in the following sentences. 1)She was blind and deaf but had some sense of touch. 2)Samuel Howe had helped countless handicapped people at Perkins inst. 3) he used unique three sided wooden letters to teach Laura words 4) others doubted whether ...

*July 7, 2015*

**Chemistry**

How energy is needed to vaporize 100 g of ethanol from its boiling point?

*June 24, 2015*

**chemistry **

TWO IDENTICAL mano METERS ARE FILLED WITH MERCURY. THE mano METERS ARE PLACED IN A CLOSED PRESSURIZED BOX CONTAINING AIR AT 1,000 TORR PRESSURE. ONE manometer CONTAINS GAS a, AND THE OTHER GAS B. WHAT IS THE DIFFERENCE BETWEEN THE PRESSURES OF THE TWO GASES? THE DENSITY IS 13....

*June 2, 2015*

**CHEMISTRTY**

i meant manometer

*June 2, 2015*

**CHEMISTRTY**

TWO IDENTICAL NANO METERS ARE FILLED WITH MERCURY. THE NANO METERS ARE PLACED IN A CLOSED PRESSURIZED BOX CONTAINING AIR AT 1,000 TORR PRESSURE. ONE NANO-METER CONTAINS GAS a, AND THE OTHER GAS B. WHAT IS THE DIFFERENCE BETWEEN THE PRESSURES OF THE TWO GASES? THE DENSITY IS 13...

*June 2, 2015*

**CHEMISTRTY**

IF CO2 TRAVELS 20.5 CM DOWN A 46.0 CM GLASS TUBE IN 1.3*10^4 AS IN THE GRAHAMS LAW EXPERIMENT, THEN COLLIDES WITH ANOTHER GAS. WHAT IS THE MOLECULAR MASS OF THE SECOND GAS?

*June 2, 2015*

**physics**

What fraction of the volume of the ball is below the waterline?

*April 28, 2015*

**Physic**

a.) Having decay constant as t=0.693/decay constant. Therefore decay constant=0.693/t (i.e time). Decay constant=0.693/30 =0.02

*April 14, 2015*

**chemistry**

An optically active compound A, C6H10O2, when dissolved in NaOH solution, consumed one equivalent of base. On acidification, compound A was slowly regenerated. Treatment of A with LiAlH4 in ether followed by protonolysis gave an optically inactive compound B that reacted with ...

*April 10, 2015*

**Calculus**

A rectangular storage container with an open top is to have a volume of k cubic meters. The length of its base is twice its width. The material for the base costs $6 per square meters and the material for the sides costs $10 per square meter.

*April 9, 2015*

**chemistry**

Calculate ▲U,▲H, ▲S, ▲A and▲G in expanding 1 mole of ideal gas at 25 ° c from 10 to 100 dm cubed. (5marks )

*March 21, 2015*

**chemistry**

Distinguish clearly between ▲G for a reaction and ▲S of the same reaction. Which of the two is used to predict whether a reaction is spontaneous? why? (4 marks)

*March 21, 2015*

**Inorganic Chemistry**

Which of the following species contain an inversion center? Choose all that apply. SeF6 [IF4]- SnF4 InH3

*March 5, 2015*

**Inorganic Chemistry**

Which of the following molecules contain a C3 axis but not a σh plane? AlCl3 SeO3 SbBr3 PCl3

*March 5, 2015*

**Inorganic Chemistry**

Which of the following species contain a C4 axis and a σh plane? Choose all that apply. [ICl4]- SiCl4 XeF4 GeH4 [PO4]3

*March 5, 2015*