09/23/20

Thermal Physics Specific Heat Capacity and Specific Latent Heat Question (in description)
Please could someone check my answers to questions I have been doing for revision purposes? I do not have a mark scheme. Thank you!Ice of mass 22g at temperature -12C is taken from a freezer and... more
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09/23/20

you have 2.6 moles pennies. how many dollars do you have?
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09/23/20

How many millicuries of technetium-99 should be given to a person who weighs 120 lbs?

The recommended dosage of technetium-99 for use in imaging lungs is 20. μCi/kg of body weight. How many millicuries of technetium-99 should be given to a person who weighs 120 lbs? (1lb = 454 g)
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09/23/20

The activation energy Ea for a particular reaction is 42.2 kJ/mol. How much faster is the reaction at 343 K than at 323 K? (R = 8.314 J/mol • K)
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09/23/20

Some more chemistry/math questions.
A) UV radiation has a wavelength of 1.00 x 10^-8 m. Calculate the energy of this radiation.B) Three naturally occurring isotopes of potassium exist: K-39, K-40, and K -42. The average atomic mass... more
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09/23/20

Chemistry Equilibrium Lab
Hi!I did a lab where I affect the equilibrium of the following: Fe3+ (aq) + SCN- (aq) <-> FeSCN2+ (aq)Fe3+ gives a yellow/orange color, SCN- is transparent and FeSCN2+ is red.A mixture of... more
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09/23/20

Chemistry questions
A: A given element is found to contain 90% of isotope having a mass of 19.00 AMU and 10% of isotope having a mass of 21.00 AMU. What is the average atomic mass of the element?B: In a neon light,... more
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09/23/20

What is the maximum mass of dichloromethane (CH2Cl2) that can be formed?
For the following reaction, 7.77 grams of methane (CH4) are allowed to react with 27.4 grams of carbon tetrachloride .methane (CH4)(g) + carbon tetrachloride(g)  dichloromethane (CH2Cl2)(g)What is... more
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09/23/20

What is the maximum amount of iron(II) chloride that can be formed?
For the following reaction, 18.7 grams of iron are allowed to react with 28.8 grams of hydrochloric acid.iron (s) + hydrochloric acid (aq) iron(II) chloride (aq) + hydrogen (g)What is the maximum... more
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09/22/20

At a pH of 7.2, which compound A or B would have better affinity for the active site?

Fully detailed Question:You notice that in the active site of the esterase there is a Phe. At a pH of 7.2, which compound A or B would have better affinity for the active site? Explain your answer... more
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09/22/20

Arrange the elements in decreasing order of the number of valence electrons.
Rank from most to least number of valence electrons. To rank items as equivalent, overlap them.Ar, Be, Mg,S, P, K, N, B,C,Ba,F,Li,Cl,I,Ne
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09/22/20

Rank from highest to lowest ionization energy. To rank items as equivalent, overlap them.
Rank the following elements by ionization energy.Ar, Xe,He
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09/21/20

fluorine-18 is used in medical imaging. If a lab has a sample containing 15 g of fluorine-18, how much fluorine-18 will remain in the sample after 8.0 h?
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09/21/20

Isotopes: are 24 12 mg, 25 12 mg, 26 12 mg isotopes of each other? Explain

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09/21/20

The metal used to make soda cans has the electron configuration [Ne] 3s23p1. Identify the metal and give its group, period, and block
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09/21/20

Write the balanced NET ionic equation for the reaction when Al(NO₃)₃ and NaOH are mixed in aqueous solution. If no reaction occurs, simply write only NR
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09/21/20

need help with a homework problem, very advanced
Guanine is an essential component of DNA. It contains the elements carbon, hydrogen,nitrogen and oxygen. When 615 mg of guanine is burned, 895 mg of carbon dioxide and 183 mgof water are formed. In... more
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09/21/20

why do you assume 100 g of a substance when given percentages?
when given a problem and the elements of a compound are given in percentages, i don't understand why you can just assume that it's 100g of the compound. why couldn't it be 200g or 700g of the... more
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09/21/20

Determine the ΔH for the formation of ONE MOLE of each of product in the following equations, include the appropriate sign. C(s) + 4 H2(g) + O2(g) ––––––––––––> 2 CH3OH(g) + 402 kJ ΔH =

I need some help please, I don't understand how to do this question:Determine the ΔH for the formation of ONE MOLE of each of product in the following equations, include the appropriate sign.C(s) +... more
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09/21/20

I need some help with a CHEM 12 problem

I really don't understand how to do this question, any help would be greatly appreciated!!Nitrogen monoxide and oxygen gas react to produce nitrogen dioxide according to the following balanced... more
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09/20/20

find boiling point
For benzene (C6H6), the normal boiling point is 80.1 °C and the enthalpy of vaporization is 30.8 kJ/mol. Calculate the boiling point of benzene (in °C) when the atmospheric pressure is 83.4 kPa.
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09/20/20

molality- chemistry
A sodium hydroxide solution that contains 43.7 grams of NaOH per L of solution has a density of 1.08 g/mL. Calculate the molality of the NaOH in this solution.
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09/20/20

The half‑lives of different medical radioisotopes are given in the table. If the initial amount of arsenic‑74 is 2.3 mCi, how much arsenic‑74 is left in the body after 54 days?
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09/20/20

When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.
When 22.2 g of ammonium nitrate is dissolved in 200 g of water, the temperature decreases from 20ºC to 12.5ºC.What is the enthalpy of solution of ammonium nitrate? Given, specific heat of solution... more
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09/20/20

Sodium nitrate in the original sample in %
A 0.4230 g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2500 g of sodium nitrite and oxygen gas. Determine the... more
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