11,286 Answered Questions for the topic chemistry
1h
Combustion analysis
A 9.418 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 15.69 grams of CO2 and 5.138 grams of H2O are produced.In a separate experiment, the molar...
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12h
The emission spectrum from atoms and molecules
a. Occurs only in the visible region of the electromagnetic spectrumb. Is a discrete spectrum that is unique to each atom or moleculec. Is a continuous spectrumd. Is a descrete spectrum that is the...
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12h
The value of ni if the observed wavelength is 657 nm is
The value of ni if the observed wavelength is 657 nm isa. 4b. 2c. 5d. 3
I think the answer is b. 2, since 657 nm is part of the Balmer Series (to n=2)
Chemistry
14h
2M(s)+6HCl(aq)⟶2MCl3(aq)+3H2(g)Δ𝐻1=−947.0 kJ HCl(g)⟶HCl(aq) Δ𝐻2=−74.8 kJ H2(g)+Cl2(g)⟶2HCl(g) Δ𝐻3=−1845.0 kJ MCl3(s)⟶MCl3(aq) Δ𝐻4=−256.0 kJ 2M(s)+3Cl2(g)⟶2MCl3(s)
Consider these reactions, where M represents a generic metal.
Use the given information to determine the enthalpy of the reaction
Chemistry
16h
What mass of carbon dioxide is produced from the complete combustion of 5.80×10−3 g of methane?
I need help before 11:00pm, thank you.
Chemistry
17h
Use specific heat energy
The specific heat capacity of solid copper is 0.385 J/g °C.(a) Determine the amount of heat energy that is associated with heating a 13.4-g sample of solid copper from 22.2 °C to 39.6 °C. J(b)...
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Chemistry
18h
Determine Specific Heat Capacity
Using the following data, determine the specific heat capacity of solid gold.
q = 24.2 J
m = 13.1 g Au
Tfinal = 39.9ºC
Tinitial = 24.5ºC J/g°C
Chemistry Physics
18h
Which of these is the main reason why the International System of Units was created in 1960?
- To make a measurement system that is easier to use than the English system.-To make more precise measurements.- To help make more accurate measurements -To avoid confusion between different...
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Chemistry
18h
Change in Enthalpy
In a constant‑pressure calorimeter, 58.7 mL of 0.930 M H2SO4 was added to 58.7 mL of 0.500 M NaOH.The reaction caused the temperature of the solution to rise from 22.30 °C to 26.01 °C. If the...
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Chemistry Chemicals
18h
How to solve this chemical question? (about chemistry)
It is time for the titration. You measure 15.0 mL of the H2C2O4 solution with a 100-mL graduated cylinder and add it to a 125-mL Erlenmeyer flask. Then you add two drops of the indicator,...
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Chemistry
20h
A) Convert 8.46×10^27 P4O10 molecules to atoms. B) 5.236×10^20 formula units PbCl4 to mol ions
Chemistry Chemicals
21h
How to solve this calculation (about chemical)
It is time for the titration. You measure 15.0 mL of the H2C2O4 solution with a 100-mL graduated cylinder and add it to a 125-mL Erlenmeyer flask. Then you add two drops of the indicator,...
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Chemistry
21h
How many grams of sodium hydroxide are present in 247.0 mL of a 0.400 M NaOH solution?
Chemistry
22h
Organic Reactions Lab Report - alcohol type, color changes, name of the functional group of the final product.
CH3-CH2-OHAlcohol Type:Color Changes: Name of the functional group of the final product: OH IH3C / \ CH3Alcohol Type:Color Changes:Name of the functional group of...
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Physics question
1. if during a 60 second jog, my average velocity is 5 m/s, how far from my starting point do i end up(what is my displacement ) in meters
Chemistry
1d
The acid dissociation constant, Ka, of acetic acid is 1.8 x 10-5. What is the pKa of this acid?
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1d
Please help me thx u
Baking soda is a white powder used for baking or cleaning. When you mix baking soda, NaHCO3, with vinegar, C2H4O2, you get a clear colorless liquid and bubbles of CO2.
Specify the phase of each of...
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