03/17/20

What volume in mL of 0.50 M NaOH is needed to completely neutralize 8.00 mL of 0.50 M HCl?
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03/16/20

Calculate the pH during the titration of 30.00 mL of 0.1000 M NaOH
Calculate the pH during the titration of 30.00 mL of 0.1000 M NaOH(aq) with 0.1000 M HCl(aq) after 12 mL of the acid have been addedThe answer is 12.63
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11/26/19

What is the rise of Jade’s stride? What is the slope and what does it mean in this problem?
Tara and Jade are hiking up a hill together. Each has a different stride. The run for Tara’s stride is 32 inches, and the rise is 8 inches. The run for Jade’s stride is 36 inches. What is the rise... more
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11/26/19

For many purposes we can treat ammonia NH3 as an ideal gas at temperatures above its boiling point of -33 degrees celsius.
Suppose the temperature of a sample of ammonia gas is raised from -14.0 °C to 21.0 °C, and at the same time the pressure is changed. If the initial pressure was 6.5 atm and the volume increased by... more
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11/26/19

If a gas has a pressure of 560 torr at 25C, at what temperature, in celsius, will it have a pressure of 430 torr?
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11/24/19

What is the pH of a 0.0620 M solution of hydrocyanic acid, HCN (Ka = 4.9 × 10⁻¹⁰)?
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11/24/19

Graph x-4 if x<2 and -2x+2 if x > or = to 2
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11/24/19

Half reaction question- standard cell potential
For the 1/2 rxn of F2(g) + 2e- --> 2F-, why is it written like that? Since it is reduced going from 0 to -1, I thought that it should be written as F2---> 2F- +1e-. I realized that the cell... more
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11/23/19

Calculate the acceleration of the weight
On a roller with a mass of M = 9 kg, a string is wrapped with a weight of m = 2 kg tied at its end. Calculate the acceleration of the weight. Consider the roller to be a homogeneous cylinder.... more
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11/12/19

What is the solution to the following system of equations?
x-4y+z = -243x+2y-3z = 102x-5y+8z = 3x+z = 6
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11/11/19

Determine the pH

What is the pH of a 0.16 M solution of Benzoic acid pKa = 4.202
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11/10/19

Physics Question
You’re riding a toboggan down an icy run to a frozen lake, and you accelerate the 62 kg combination of you and the toboggan from 1.2 m/s to 4.9 m/s in 1.2 s. How much power does that require?
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11/09/19

How do I find the impulse and final speed in this problem?
I am revising for my physics exam and I got stuck on this problem:A trolley with mass 100kg is moving along a track at 7m/s (ignore friction). We drop a 20kg box from a bridge above the track.... more
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11/09/19

Physics Motions and Forces

A child is sitting in a wagon and is being pulled by a 10N force along a rough surface (friction exists betweenthe wagon and ground). The weight of the wagon is 150N (mass is 15 kg). The wagon is... more
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11/09/19

Thermochemistry
A ball bearing at 259.0 °C is dropped into a cup containing 246.1 g of water at 17.7 °C. The water and ball bearing come to a temperature of 36.3 °C. What is the heat capacity of the ball bearing... more
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11/01/19

physics homework help needed
The shape of the earth's orbit around the sun is essentially a circle. Assuming the earth maintains a constant speed as it orbits around the sun, which statement about the earth's motion is most... more
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09/14/19

Net force of a drinking glass
In order to drink from your glass you first need to lift it to your mouth. As you begin to lift your 0.20kg glass of water it is accelerating upwards at 0.090 m s-2. a) what is the net force acting... more
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09/14/19

Gravitational force of Earth and Moon
The Earth has a mass of 5.97*1024 kg and the Mood has a mass of 7.36*1022 kg. The average distance between the center of the Earth and the center of the moon is 3.84*108 m.a) What is the... more
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06/02/19

2 race cars start from the same position with 0 velocity. Car A accelerates with 3.50 m/s^2, car B accelerates with 4.9 m/s^2 with a 1.00 second delay. how long will it take for car B to reach car A?
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05/06/19

which colour show maximum Photoelectric effect IN rainbow
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05/03/19

magnetic force in physics
A proton moves at a speed of 5.9 × 107 m/s at right angles to a magnetic field with a magnitude of 0.095 T. Find the magnitude of the acceleration of the proton. Answer in units of m/s 2 .
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04/28/19

The _______ of a machine is the amount by which a machine would multiply the force applied to it if no energy were lost due to friction.
The _______ of a machine is the amount by which a machine would multiply the force applied to it if no energy were lost due to friction.
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04/28/19

How does a lever apply forces with advantage?
How does a lever apply forces with advantage? A. It applies a small amount of force to produce a large amount of force. B. It gives the advantage of change in direction of the effort force. C. It... more
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