25,963 Answered Questions for the topic chemistry

Chemistry

04/28/23

Bond Enthalpy & Enthalpy of a Reaction
N2 + 3H2 --> 2NH3a. What change in energy is required to make 1.00 mol of NH3?b. What change in energy is required to make 1.00 gram of NH3?c. What change in energy is required to use up 2.34g... more
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Chemistry

04/28/23

classify the following
Classify the following reactions as synthesis, decomposition, single displacement, double displacement, precipitation, acid-base neutralization, oxidation-reduction, or combustion. Each reaction... more
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Chemistry

04/28/23

Chemistry related

A catalyst will(A)alter the pathway (mechanism) of a chemical reaction. (B)increase change of H for the reaction.(C) decrease change of Hfor the reaction.(D) decrease Ea for the forward reaction... more
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Chemistry

04/28/23

Chemistry related

Which statement most accurately describes the behavior of a catalyst?(A)A catalyst increases the change of G of a reaction and hence the forward rate.(B)A catalyst reduces the change of H of a... more
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Chemistry

04/28/23

Chemistry related

The addition of a catalyst in a chemical reaction (A) increases the concentration of products at equilibrium. (B) increases the fraction of reactant molecules with a given kinetic energy. (C)... more
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Chemistry

04/28/23

Chemistry related question

Which is not a characteristic of ionic substances?(A) Their reactions are generally extremely slow. (B) They conduct an electric current when fused. (C) Those having a common ion exhibit some... more
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Chemistry

04/28/23

Arrhenius Acids and Bases

A student in your class completed an acid/base lab but mixed up the labels on the chemicals. They tested NaOH, NaCl, and HCl. Use the data table below to determine the identity of each... more
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Chemistry

04/27/23

What is E at 25 °C for the reaction described by Zn(s) | Zn²⁺ (0.10 M) || Cu²⁺ (1.00 M) | Cu(s)? The standard cell potential for the reaction is +1.100 V.
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Chemistry

04/27/23

For the galvanic (voltaic) cell Fe(s) + Mn²⁺(aq) ⟶ Fe²⁺(aq) + Mn(s) (E° = 0.77 V at 25 °C), what is [Fe²⁺] if [Mn²⁺] = 0.040 M and E = 0.78 V? Assume T is 298 K
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Chemistry Physics

04/27/23

12 g of dry ice (solid CO_2) is placed in a 7000 cm^3 container, then all the air is quickly pumped out and the container sealed. The container is warmed to 0∘C, a temperature at which CO_2 is a gas.
What is the gas pressure? Give your answer in atm.The gas then undergoes an isothermal compression until the pressure is 2.8 atm , immediately followed by an isobaric compression until the volume... more
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Chemistry

04/27/23

Which pair of elements have the same number of neutrons
Which pair of elements have the same number of neutrons. In 21H, the atomic number is 1 and atomic mass is 2.Group of answer choices126C, 115B115B, 105B146C, 147N31H, 21H126C, 105B
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Chemistry

04/27/23

which statement is true?
A metal gas cylinder containing 17.1 atm of nitrogen is stored at 300K. According to the ideal gas law, PV = nRT, if the temperature doubles, which statement is true?Group of answer choicesthe... more
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Chemistry

04/27/23

Choose the common units of volume. There are only three.
Choose the common units of volume.  Milliliter   Cubic milliliter   Liter   Pound   Pool   Newton   Pascal   There are only three as per my instructor. Please help me
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Chemistry

04/27/23

At a certain temperature, 0.3611 mol of N2 and 1.741 mol of H2 are placed in a 3.50 L container.

At a certain temperature, 0.3611N2 and 1.741 mol of H2 are placed in a 3.50 L container.N2(g)+3H2(g)↽−−⇀2NH3(g)At equilibrium, 0.1401 mol of N2 is present. Calculate the equilibrium constant, 𝐾c
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Chemistry

04/27/23

Colligative Properties
Is this which salt would be better to de-ice a sidewalk NaCL or CaCl^2 and why ?
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Chemistry

04/27/23

A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4.
The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative terminal of the potentiometer. Calculate the [Zn2+] in the solution if the cell... more
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Chemistry

04/27/23

Colligative properties
Which solution will have the highest boiling pointso, I know that solutions have higher boiling points than pure solvents.1 molal NaOH2 molal C^5H^11OH0.5 molal Mg^3N^2what is an electrolyte and... more
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Chemistry

04/26/23

Calculate the number of moles of NH3(g) produced when 0.150 mol N2 is allowed to react with 0.430 mol H2(g). N2(g) + 3 H2(g)  2 NH3(g)
please help!!!
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Chemistry

04/26/23

If a tree dies and the trunk remains undisturbed for 1.360 × 10⁴ years, what percentage of the original ¹⁴C is still present? (The half-life of ¹⁴C is 5730 years.)
Please Answer :) If a tree dies and the trunk remains undisturbed for 1.360 × 10⁴ years, what percentage of the original ¹⁴C is still present? (The half-life of ¹⁴C is 5730 years.)
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Chemistry

04/26/23

Question In Description
3. A sample of aluminunm that weighed 0.050 g reãcted with excess 6.0 M HCI. Ả volume of48.3 mL of H, gas was collected over water at 22.0°C and at an atmospheric pressure of 751 mmHg. Calculate... more
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Chemistry

04/26/23

Rates of Decay Reactions
Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9 hours. If you begin with 39.8 mg of this isotope, what mass remains after 200 hours have passed?
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04/26/23

What element in the same group as hydrogen has a larger atomic radius?
What element in the same group as hydrogen has a larger atomic radius? helium  Mercury  rubidium  tungsten  none of the above
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04/26/23

The most common ion for chromium has a charge of 2+. What element in the same period as chromium has a smaller ionic radius?
The most common ion for chromium has a charge of 2+. What element in the same period as chromium has a smaller ionic radius? bromine  calcium  germanium  manganese  none of the above
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04/26/23

What element in the same group as polonium has a lesser electronegativity?
What element in the same group as polonium has a lesser electronegativity?  oxygen  selenium  sulfur  tellurium  none of the above
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04/26/23

What element in the same group as polonium has a lesser electronegativity?
What element in the same group as polonium has a lesser electronegativity?  oxygen  selenium  sulfur  tellurium  none of the above
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