12/10/20

Limiting Reactants: Compare Product Method (Mass/Mass)
For the following reaction, 8.90 grams of butane (C4H10) are allowed to react with 19.0 grams of oxygen gas.butane (C4H10) (g) + oxygen (g) carbon dioxide (g) + water (g)What is the maximum amount... more
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12/10/20

Write NIE: Review
Does a reaction occur when aqueous solutions of potassium carbonate and calcium acetate are combined?yes/noIf a reaction does occur, write the net ionic equation.Be sure to specify states such as... more
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12/10/20

Chemical Equations: Mass/Mass Calculations
According to the following reaction, how many grams of hydrogen peroxide (H2O2) are needed to form 26.3 grams of oxygen gas?hydrogen peroxide (H2O2) (aq) water (l) + oxygen (g) grams hydrogen... more
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12/10/20

Which of the following salts is more soluble in 1.0 M H+ than in pure water?
Options areAnswered  1 NaCl  2 MgCl2 3 NaNO3  4 CaCO3
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12/10/20

Chemistry Mole Question
In 1991, replacement compounds for Freons went into production. One of them, HFC -134a, contains 23.53% C,1.96% H, and 74.51% F(by mass). If 1.0L of HFC-134a gas at STP has a mass of 4.55g, what is... more
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12/10/20

How to write the AXE notation for Methoxymethane and Propane?
I've learned how to write the AXE notation of some molecules such as Selenium Tetrachloride (SeCl4) which is AX4E1. I do not find any difficulties in writing this since there are only two elements... more
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12/10/20

Chemistry Question

1.00 mole of sodium sulfate (Na2SO4) is dissolved in 10.0 L of water. What is the concentration of potassium ions in the resulting solution? A. 0.200 M B. 0.500 M C. 0.400 M D. 0.100 M
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12/10/20

What is the Ph and is it basic or acidic ?
[H3O+] = 4.33 x 10^-7 [OH] = 3.33 x 10^-9 pH= 12.3 [H3O+]= pOH = 4.46 [H3O+] =
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12/10/20

When 50.0 g of water at 95.0 C is transferred to 35.0 g of water at 28.0 C, what is the final temperature of the mixture of water?
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12/10/20

A sample of water with a mass of 27.56g and an unknown temperature loses 2443 Joules. If the final temperature is found to be 62.50 C. What was the initial temperature?
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12/10/20

A system does 125 J of work and cools down by releasing 438 J of heat. The change in internal energy is ____________ J.
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12/10/20

Which of the following electronic configuration represents ion for transition element .…

Which of the following electronic configuration represents ion for transition element .… a) [Ar] 4s2 , 3d8 b) [Ar] 4s1, 3d10 c) [Ar] 4s0 , 3d9 d) [Ar] 4s2, 3d0 ## I need the solution with... more
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12/10/20

Does a reaction occur when aqueous solutions of potassium hydroxide and lead(II) nitrate are combined? If a reaction does occur, write the net ionic equation.
Be sure to specify states such as (aq) or (s).
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12/09/20

Cinnabar is a mineral that is mined in order to produce mercury. Cinnabar is HgS. What mass of mercury can be obtained from 50.0g of cinnabar? (use sig figs, give a unit of g)
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12/09/20

I need help with an AP Chem problem. Thanks in advance!
Which of the following reactions would proceed the furthest to completion?   A (g) + B (g) ↔ C (g) Kp = 1.2 x 103 AB2 (g) ↔ A (g) + 2B (g) Kp = 0.785 A (g) ↔ B (g) Kp = 3.45 x 10-4 A (g) + B... more
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12/09/20

Which one is correct? I have two different answers to the question: Is the number of particles per mole dependent on the kind of atom/element? Why or why not?
No, because the number of particles per mole is measured by the Avogadro Number. This means that one mole of any substance is equal to 6.022 × 10²³. Although the number of particles per mole is not... more
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12/09/20

Chemistry mole question
A compound has a percentage composition of 43.1% C, 7.7% H, 8.2% O, and 41.0% Br. If the molar mass of the compound is 195g, what is the molecular formula for the compound?
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12/09/20

The reaction SO2 (g) + O2 (g) → SO3 (g) is an example of which of the following reaction types? (Choose ALL that apply.)
Acid-Base (Neutralization) Combination (Synthesis) Combustion Decomposition Double Displacement (Double Replacement, Exchange) Oxidation-Reduction... more
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12/09/20

Consider the following equilibrium:  Determine the effect on the position of equilibrium when a catalyst is added.
Consider the following equilibrium:  Determine the effect on the position of equilibrium when a catalyst is added. a. shifts to the right b. shifts to both the left and the right c. shifts... more
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12/09/20

A student wanted to prepare a 3.2 % (m/m) solution of ammonium chloride using 100.0 g of water. How many grams of NH4Cl must the student use?
Enter your answer with the proper number of significant figures.
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12/09/20

If the molar concentration of HNO3 is 0.0006955. Calculate the pH of the solution
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12/09/20

The reaction KClO3 (s) → KCl (s) + O2 (g) is an example of which of the following reaction types?

(Choose that all apply) Acid-Base (Neutralization) Combination (Synthesis) Combustion Decomposition Double Displacement (Double Replacement, Exchange) Oxidation-Reduction... more
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12/08/20

chemistry question
What is the root mean square average speed of of water molecules at 211 degrees Celsius in the gas phase. Can someone please show the steps as well.
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12/08/20

The first-order isomerization reaction: cyclopropane → propene, has a rate constant of 1.1 × 10-4 s-1 at 470°C and an activation energy of 264 kJ/mol.
What is the temperature of the reaction when the rate constant is equal to 4.36 × 10-3 s-1?
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12/08/20

solution of 0.2113 g of water dissolved in 25.0 g of a solvent freezes at 11.5°C below the freezing point of the solvent. What is Kf for this solvent?
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