4,374 Answered Questions for the topic Science

04/04/21

Calculate enthalpy
The following reaction is exothermic. N2(g)+H2(g)+3O2(g)=2HNO3(g) deltaH(1)=-270kjcalculate the enthalpy change for the reaction of the elements to form one mole of HNO3(g). 1/2N2(g)+1/2H2(g)+3/2... more
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Science Math Physics

04/04/21

In need of help with a physics problem, anything is appreciated.
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Science Math Physics

04/04/21

In need of help with a physics problem, anything is appreciated.
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Science

04/03/21

Humans often use methods of artificial selection, such as selective breeding, to produce horses with specific traits.
Which statement best describes how selective breeding helps horse breeders produce the most desirable traits for racing?   ASelective breeding produces horses with a higher rate of survival due to... more
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04/01/21

Urgent physics help

An electron has mass m=9.1x10-31 kg and charge q = 1.6x10-19 C. In an experiment at Oak Ridge National Laboratory, an electron is accelerated from rest by moving through the electric field between... more
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04/01/21

Urgent physics help
The next three questions relate to this scenario.An electron has mass m=9.1x10-31 kg and charge q = 1.6x10-19 C. In an experiment at Oak Ridge National Laboratory, an electron is accelerated from... more
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03/31/21

At the point in a titration where 5.00 mL of 0.225 mol/L hydrochloric acid, HCl(aq), is added to 40.00 mL of 0.175 mol/L potassium hydroxide, KOH(aq), what is the pH of the solution?

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03/30/21

variations and variables
Suppose that y is inversely proportional to the 4th power of x, and that y=15 when x=6. What is y when x=5?y=???
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03/30/21

Variation and multiple variables

Suppose that y varies directly as the cube root of x,and that y=10 when x=5832. What is y when x=125
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03/30/21

Variations and multi variable

W varies inversely as d^2
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03/30/21

concentration question
Determine the pH and pOH of a solution at 25°C with a hydronium ion, H3O+(aq), concentration of 3.20x10-10 mol/L. (please show me all the steps when solving this)
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03/30/21

Common functions
Find two points on the graph of this function, other than the origin, that fit within the given [-10,10]by[-10,10] grid. Express each coordinate as an integer or simplified fraction, or round to... more
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03/29/21

What is the rate equation given this data table?
A chemist does a reaction rate analysis on the following reaction:2NO (g) + O2 (g) → 2NO2 (g)She collects the following data:Trial Initial [NO] (M) Initial [O2] (M) Instantaneous Rxn Rate (M/s)1 ... more
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03/29/21

The statement below is fallacious. Indicate which fallacy the speaker has committed:
"Which is more likely--that the Yankees lose the first game of the series, or that they lose the first game and come back to win? I expect the Yankees to win the series, so I'll take the second... more
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Science Math Physics

03/29/21

A 50kg block is sliding on a frictionless surface at 4.0 m/s when it strikes a spring with a spring constant k of 1000 N/m.
A 50kg block is sliding on a frictionless surface at 4.0 m/s when it strikes a spring with a spring constant k of 1000 N/m.a. What will be the speed of the block when the spring is fully... more
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Science Math Physics

03/29/21

A 10kg object is falling through air. If the object was initially 5.0m off the ground, and hits the ground at a speed of 9.0 m/show much energy was dissipated due to air resistance?
A 10kg object is falling through air. If the object was initially 5.0m off the ground, and hits the ground at a speed of 9.0 m/show much energy was dissipated due to air resistance?
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03/29/21

Assign oxidation states to bromine
Assign oxidation states to bromine in the following compounds: HBr HOBr Br2 BrF3
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03/29/21

Determine the concentration of the acid
The flask contains 25mL of an unknown diprotic acid aqueous solution that reacts in a 1:2 stochiometric ratio with NaOH. Tritrate the solution with NaOH to determine the concentration of the acid.
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03/29/21

Determine unknown volume 
Calculate the volume of 6.93x10^-2 M calcium hydroxide required to neutralize 28.2 mL of a 0.147 M hydrochloride acid solution.
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03/29/21

Use Use primary standard to determine unknown concentration 
Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand... more
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03/29/21

physics question
A block of known mass M=1.5kg is at rest at the base of a ramp. A second identical block of mass M=1.5kg travels at a known, constant velocity v0 = 15.7m/s,. The block that travels at a... more
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Science Physics Physics B

03/28/21

What is the distance Δxa between the places where the intensity is zero due to the single slit effect? Give answer in mm to two significant figures.

Consider a double-slit with a distance between the slits of 0.04 mm and slit width of 0.01 mm. Suppose the screen is a distance of 1 m from the double-slit and light with a wavelength of 600 nm is... more
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Science Physics

03/28/21

If the spacing between the slits d is very large, what happens to the spacing between the zero intensity points?

Which of these makes sense? (only pick 1) It would become very small. It would depend on other details of the experimental setup. It would not change. It would become equal to the slit... more
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03/28/21

Use primary standard to determine unknown concentration

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand... more
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Expert Answers •1

03/28/21

Determine unknown volume

Calculate the volume of 6.93x10^-2 M calcium hydroxide required to neutralize 28.2 mL of a 0.147 M hydrochloride acid solution.
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