10/24/20

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
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10/24/20

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)
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10/24/20

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
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10/23/20

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
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10/23/20

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
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10/23/20

A) Convert 8.46×10^27 P4O10 molecules to atoms. B) 5.236×10^20 formula units PbCl4 to mol ions
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10/23/20

How many grams of sodium hydroxide are present in 247.0 mL of a 0.400 M NaOH solution?
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10/23/20

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
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10/23/20

A sample of water with a mass of 35.75g and an initial temperature of 99.22 loses 12750 Joules. What is the final temperature? *
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10/23/20

A sample of water of unknown mass undergoes a temperature change from 59.77 C to 52.64 C with a change in heat content of -18960 Joules. What is the mass of the water? (3 Sig Figs)
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10/23/20

A sample of water with a mass of 762.8 g and an initial temperature of 14.61 gains 119200 Joules. What is the final temperature?

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10/23/20

A sample of water with a mass of 965.1 g and an unknown temperature gains 322300 Joules. If the final temperature is found to be 97.61 C . What was the initial temperature? *
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10/23/20

specific heat to energy/temp
A sample of gaseous hydrogen is heated with an electrical coil. If 2.58×103 Joules of energy are added to a 11.8 gram sample initially at 21.0 °C, what is the final temperature of the hydrogen?
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10/23/20

energy and temp change to specific heat
In the laboratory a student finds that it takes 3.05×103 Joules to increase the temperature of 14.9 grams of gaseous hydrogen from 21.3 to 36.8 degrees Celsius.The specific heat of hydrogen he has... more
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10/23/20

Calculate the energy change of a full substance over temp range
The following information is given for mercury at 1 atm: boiling point = 356.6 °C    Hvap(356.6 °C) = 295.6 J/g melting point = -38.90 °C Hfus(-38.90 °C) = 11.60 J/g specific heat gas... more
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10/23/20

Calculate the energy change during a phase change
Given the following information for tin, Sn (at 1 atm), calculate the amount of heat in kJ needed (at 1 atm) to melt a 36.7-g sample of solid tin at its normal melting point of 232 °C. boiling... more
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10/23/20

Predict thermal equilibrium temps
A 14.69-g block of solid titanium at 65.34 °C is immersed in a 23.08-g pool of liquid ethanol with a temperature of 14.71 °C. When thermal equilibrium is reached, what is the temperature of... more
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10/23/20

Is answer correct or not? (about chemical calculation)
Calculate the number of moles of oxalic acid and the molarity of the oxalic acid solution. Molar mass of H2C2O4•2H2O 126.07 g/mol Mass of H2C2O4•2H2O              1.5232g 1) No. of moles of... more
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10/23/20

Use specific Heat Capacity
The specific heat capacity of gaseous oxygen is 0.916 J/g °C.(a) Determine the amount of heat energy that is associated with heating a 10.9-g sample of gaseous oxygen from 22.2 °C to 37.9 °C.Must... more
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10/23/20

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
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10/23/20

chemical formulas and Soluble in Water
Identify the chemical formulas for these common household items. Would they be soluble in water?  Item Chemical Formula Soluble in Water? Table Salt Epsom Salt Lye Chalk Washing... more
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10/23/20

net reaction of the reaction series
What is the net reaction of the reaction series below? 3 CO2(g) + 4 H2O(g) -----> C3H8(g) + 5 O2(g)3 C(s) + 3 O2(g) -----> 3 CO2(g)4 H2(g) + 2 O2(g) -----> 4 H2O(g)
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10/23/20

identity of that compound / soluble
If both products are soluble, enter “none” in the box. If a solid product (precipitate) would form, write the identity of that compound in the box. sodium sulfate Na2SO4(aq) sodium phosphate... more
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10/23/20

Is this calculation correct up here? (about chemistry)
A student prepared a standard oxalic acid (H2C2O4·2H2O) solution and performed a titration to determine the molarity of an unknown sodium hydroxide (NaOH) solution.Use the data given below to find... more
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10/23/20

Finding pH of salts
Assume a pH of 25°C What is the pH of a 2.4E-2M barium cyanide? Is a solution of 0.73M potassium dihydrogen arsenide acidic, basic, or neutral? Show your work. Is a solution of 4.3E-3M solution... more
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