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11,286 Answered Questions for the topic chemistry

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... more
Chemistry Science Biochemistry

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... more
Chemistry Science Biochemistry

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)... more
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... more
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... more
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,... more
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,... more
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... more
Chemistry Science Physics

1d

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

What is the pH of a 0.41 M HCl solution?

Chemistry Science Biochemistry

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... more
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