4,349 Answered Questions for the topic Science

04/08/21

Specific Heat/Heat Transfer
Glass Liquid Water Oxygen Gas Wood Concrete Gold Carbon Dioxide Gas rank the following substances in the order of their specific heats from lowest to highest.
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04/08/21

Bohr model calculations
Calculate the energy of an electron in the n = 3 level of a hydrogen atom.
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04/08/21

Bohr model calculations
Calculate the energy for the transition of an electron from the n = 8 level to the n = 7 level of a hydrogen atom.E =  ???JoulesIs this an absorption or an emission process?____???_____
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04/07/21

Need help before April 10th! Please and thank you!
___C6H6+ ___Cl2→ ___C6H5Cl + ___HClWhen 39.0 g of C6H6reacts with an excess of Cl2, the actual yield of C6H5Cl is 42.0 g. What is the percent yield of C6H5Cl?
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Science Math Chemistry

04/07/21

Help With A Chemistry Problem Please
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Science Math Chemistry

04/07/21

Help With A Chemistry Problem Please
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Science Math Chemistry

04/06/21

Unsure how to solve a chemistry problem, all help is appreciated.
Calculate the enthalpy of reaction for the decomposition of hydrogen peroxide to water and oxygen gas according to the following equation. H2O2(l) ------->H2O(l) + O2(g) Use the following Table... more
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04/06/21

inverse of functions
y=4x−2Find four points contained in the inverse.
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04/05/21

What is the magnification of the image?

Suppose that you have a converging lens that produces a real image of a small object. The image is at a distance of 150 cm to the left of the lens and the object is at a distance of 75 cm to the... more
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04/05/21

Will the image of the object be on the right side or left side of the lens?

Suppose that you have a converging lens with a focal length of 20 cm and you place a small object at a distance of 25 cm to the right of the lens. I understand the image will be real so just not... more
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04/05/21

Chemistry Help Please

3Al (s) + 3NH4ClO4 -->Al2O3(s) + AlCl3 (s) + 3NO (g) + 6H2O (l)1)Which reactant is the limiting reactant if 4.25 g of Al is mixed with 5.46 g of NH4ClO4 2)How many grams of Al2O3 can be... more
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04/05/21

Ethalpy reactions
The following reaction is endothermic. MgCl2(s) Mg(s) + Cl2(g)    ΔH(1) = 641 kJ Calculate the enthalpy change for the reaction of the elements to form one mole... more
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04/05/21

Calculate enthalpy change
Given the following two reactions:(1)Pb(s) + Cl2(g)PbCl2(s)     H(1) = -359.4 kJ(2)Mg(s) + Cl2(g)MgCl2(s)     H(2) = -641.3 kJcalculate the enthalpy change for the following reaction:(3) Pb(s) +... more
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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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