05/02/21

Please help me with endothermic vs exothermic.

Which of the following processes is endothermic?A. H2O(g)  H2O(l)B.O2(g) + 2 H2(g)  2 H2O(g)    C. 3 O2(g) + 2 CH3OH(g)  2 CO2(g) + 2 H2O(g)D. H2O(s)  H2O(l)
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05/02/21

Please help me with this heat problem in chemistry

Calculate the ΔH°rxn for the following reaction.SiO2(s) + 4 HCl(g)  SiCl4(g) + 2 H2O(g)You have the following data.ΔH°f [SiO2(s)] = -910.9 kJ/molΔH°f [SiCl4(g)] = -657.0 kJ/molΔH°f [HCl(g)] = -92.3... more
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05/02/21

Please help me with chemistry and heat

The highly exothermic thermite reaction, in which aluminum reduces iron(III) oxide to elemental iron, has been used by railroad repair crews to weld rails together.2 Al(s) + Fe2O3(s)  2 Fe(s) +... more
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05/02/21

Please help me with chemistry about Enthalpy
Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, was used by the ancient Romans as mortar in stone structures. The reaction for this process is shown below.Ca(OH)2(s)... more
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05/02/21

Please help me with these Chemistry questions.

For each of the following, does entropy increase or decrease? Gold jewelry is melted down The dry ice sublimes as the package of frozen goods is shipped Frost forms over the lawn from the humid... more
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05/02/21

How to find the Ph
What is the pH of a 0.15 M solution of 100 mL NH3, when the ka of NH4+ is 5.8 x 10-10?
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05/02/21

Chemistry Question 6
How many formula units of sodium chloride (NaCl) salt is produced from 18.0 g of sodium (Na)? 2 Na (s) + Cl2 (g) --> 2 NaCl (s)A. - 4.71 x 1023 formula units of NaClB. - 9.43 x 1023 formula... more
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05/01/21

Find the number of protons, neutrons and electrons in Mg+2
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05/01/21

How many grams of MnCl2 will be oxidized by 10.0g of NaBiO3?
Sodium bismuthate (NaBiO3) oxidizes MnCl2 to MnO4- and is consequently reduced to Bi(OH)3. How many grams of MnCl2 will be oxidized by 10.0g of NaBiO3? (show your work.)
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05/01/21

Vapor Pressure of a certain liquid
A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 206.0 Torr at 45.0 ∘C.a. Calculate the value of delta H vap for this liquid.b. Calculate the normal boiling point of... more
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05/01/21

Chemistry Question...07
Students held a four-mole strip of magnesium over a flame until a combustion began. Students were provided the balanced chemical reaction for the combustion of magnesium and asked to describe the... more
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05/01/21

What is the percent yield?

A reaction between tin and fluorine is supposed to yield 96.0 g SnF4. Instead, only 77.0 g SnF4 is produced.
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05/01/21

How many liters of water vapor can be produced from 1.80 mol O2 at STP?

The equation is: 2H2(g)+O2(g)=2H2O(g)
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05/01/21

Calculate energy in joules required to move an electron from its ground state to an excited state
Calculate the energy in joules required to move an electron from its ground state (level 1) to an excited state of n=[2].
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05/01/21

Methane reacts with oxygen according to the following equation. CH2(g) + 2O2(g)   ------->  CO2(g) + 2H2O(l)
Methane reacts with oxygen according to the following equation.CH2(g) + 2O2(g)   ------->      CO2(g) + 2H2O(l)The ff data were obtained from an experiment. Time (min) [CH4] (mol L-1) [CO2]... more
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05/01/21

If the initial concentration of H2O2 is 3.62×10-2 M, the concentration of H2O2 will be _____  M after 1235 min have passed.
The decomposition of hydrogen peroxide in dilute sodium hydroxide at 20 °CH2O2(aq)  H2O(l) + ½ O2(g)is first order in H2O2 with a rate constant of 1.10×10-3 min-1.If the initial concentration... more
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05/01/21

The following initial rate data are for the reaction of tertiary butyl bromide with hydroxide ion at 55 C :
The following initial rate data are for the reaction of tertiary butyl bromide with hydroxide ion at 55 oC:(CH3)3CBr + OH-  (CH3)3COH + Br- Experiment [(CH3)3CBr]o, M [OH-]o, M Initial Rate,... more
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04/30/21

in the following reaction, H₂SO₄ + H₂O ↔ HSO₄⁻ + H₃O+, which one is the acid, and which one is the base
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04/30/21

In the following reaction, C₅H₅N + HCOOH ↔ C₅H₅NH⁺ + COOH⁻ is a acid and which one is a base
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04/30/21

Need help solving! Please and thank you!
If a 5.4 M solution of Ca(NO3)2 dissociates completely in water, what is the final [NO3-]?
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04/30/21

What volume will 0.375 mol of oxygen gas occupy at STP?
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04/30/21

Please help me with these Chemistry questions.

The following reaction was used to fuel the rockets in the Apollo mission landing module. Is this reaction endothermic or exothermic? How do you know?2.Does the graph below represent an endothermic... more
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04/30/21

Balance Calorimetry Equation
I have seen some online resources stating:Q lost metal = - Q gained water (the negative sign is on the side of energy gain)But from what I learned, the q energy is negative when heat is released... more
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04/29/21

Calculate the amount of aniline - in mL - needed for the reaction
A reaction uses 5.00 millimoles of aniline. the molecular weight of aniline is 93.13 g/mol and the density is 1.02 g/mL. Calculate the amount of aniline - in mL - needed for the reaction
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04/29/21

General Chemistry 1
A chemist carefully measures the amount of heat needed to raise the temperature of a 0.64kg sample of a pure substance from −5.4°C to 18.6°C. The experiment shows that 3.6kJ of heat are needed.... more
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