09/28/21

If a 0.500 gram sample of copper metal reacts with 6 M nitric acid, what is the minimum volume (in mL) of acid should be added to ensure that all of the copper reacts? Show all work neatly
If a 0.500 gram sample of copper metal reacts with 6 M nitric acid, what is the minimum volume (in mL) of acid should be added to ensure that all of the copper reacts? Show all work neatly
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09/28/21

Rank these in order of increasing atomic radii: Si, Cl, Na, F?
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09/28/21

When Ag is exposed to air it gets a black coating of (a) AgNO3
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09/27/21

Part 1: Which of the following salts produces a basic solution in water: NaF, KCl, NH4Cl? Choose all that apply
Part 1: Which of the following salts produces a basic solution in water: NaF, KCl, NH4Cl? Choose all that apply.a. NaFb. KClc. NH4Cld. None of the choices will form a basic solution.Part 2: Write... more
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09/27/21

Calculate the pOH of a 0.0987 M aqueous sodium cyanide solution at 25.0 °C. Kb for CN- is 4.9 x 10-10.
A. 9.33B. 5.16C. 8.84D. 1.01E. 10.00
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09/27/21

The Ka of hydrofluoric acid (HF) at 25.0 °C is 6.8 × 10-4. What is the pH of a 0.25 M aqueous solution of HF?
A. 0.60B. 1.88C. 1.28D. 3.64E. 4.34
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09/27/21

What is the pOH of a 0.045 M solution of calcium hydroxide?
Hint: remember to write the chemical formula and the consider the stoichiometry.
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09/27/21

What is the conjugate acid of HSO4- ?
A. OH-B. H3O+C. HSO3-D. SO4^2-E. H2SO4
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09/27/21

What is the pH of a room temperature solution with a concentration of OH- of 3.92 x 10-5?
Remember: Kw = 10-14, and pH + pOH = 14= pKw 
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09/27/21

net ionic equation

Write a net ionic equation for the reaction that occurs when excess nitric acid (aq) and potassium sulfite (aq) are combined. Note: Sulfites follow the same solubility trends as sulfates.
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09/27/21

net ionic equation
Write a net ionic equation for the reaction that occurs when excess hydroiodic acid and manganese(II) carbonate (s) are combined.
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09/27/21

Calculate the energy, in joules, to heat a cube of gold with a volume of 8.00 cm3 from 15 ∘C to 27 ∘C. (Assume that the density of gold is 19.3 g/cm3, the specific heat for gold is 0.129 J/g∘C.)
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09/27/21

Balance the above chemical equation and state whether the reaction is endothermic or exothermic. Evaluate the change in enthalpy of reaction (ΔHrxn).
Hematite is a kind of mineral that can be commonly found in Earth. It mainly consists of iron(III) oxide. Iron metal (Fe) can be extracted by many ways from this mineral. A chemist wants to try and... more
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09/27/21

Balance the chemical equations below. Indicate the species being oxidized, reduced and the number of electrons transferred in the balanced equation respectively.

Balance the chemical equations below. Indicate the species being oxidized, reduced and the number of electrons transferred in the balanced equation respectively. (a)MnO4-(aq) + ClO-(aq) →MnO2(s) +... more
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09/27/21

dimensional analysis
5. The following densities are given at 20oC: water, 0.998 g/cm3; iron, 7.86 g/cm3; aluminum, 2.70 g/cm3. Arrange the following in terms of increasing mass: a. A rectangular bar of iron, 162 cm x... more
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09/27/21

Avogadros Law Chemistry
A sample of gas contains 0.120 mol of C2H4(g) and 0.120 mol of H2O2(g) and occupies a volume of 13.3 L. The following reaction takes place:C2H4(g) + H2O2(g)CH2OHCH2OH(g)Calculate the volume of the... more
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09/27/21

The reaction C4H8(g)⟶2C2H4(g) has an activation energy of 262 kJ/mol. At 600.0 K, the rate constant, 𝑘, is 6.1×10−8 s−1. What is the value of the rate constant at 835.0 K?
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09/27/21

After 41.0 min, 22.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics?
How many minutes would it take?
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09/26/21

How many atoms are in 19.1 g of potassium oxide (K2O)?
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09/26/21

Express the concentration of a 0.0730 M aqueous solution of fluoride, F−, in mass percentage and in parts per million (ppm). Assume the density of the solution is 1.00 g/mL.
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09/26/21

If 1.3860 g of Mg ribbon combusts to form 2.1252 g of Magnesium oxide product, calculate the experimental empirical formula from this data.
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09/26/21

The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes.

The Ostwald process is used commercially to produce nitric acid, which is, in turn, used in many modern chemical processes. In the first step of the Ostwald process, ammonia is reacted with oxygen... more
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09/26/21

NIE: Acids + Strong Base OB
Write a net ionic equation for the reaction that occurs when aqueous solutions of hydrobromic acid and barium hydroxide are combined.
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09/26/21

NIE: Sulfate, Hydroxide, Sulfide, Carbonate, Phosphate
Consider the reaction when aqueous solutions of potassium hydroxide and zinc iodide are combined. The net ionic equation for this reaction is:
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09/26/21

NIE: Sulfate, Hydroxide, Sulfide, Carbonate, Phosphate
Consider the reaction when aqueous solutions of sodium phosphate and chromium(III) chloride are combined. The net ionic equation for this reaction is:
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