4,365 Answered Questions for the topic Science

Science Chemistry Physics

11/04/21

Thermochemistry. Answer, step by step please. (show work)
6) NaHCO3 decomposes into Na2CO3, CO2 , and H2O ∆H = 91.5 kJ a. Write a balanced chemical equation that includes heat as a reactant or product. b. What volume of Carbon dioxide is produced when 314... more
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11/03/21

Thermochemistry. Answer, step by step please. (show work)
Combustion of C8H18(g) ∆H = -5076 kJ a. Write a balanced chemical equation that includes heat as a reactant or product. b. What volume of products can be made if 120 kilojoules are released?
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Science Physics

11/03/21

science physics
What is the energy of a 9kg brick sitting on top of a 75m building? PE = mgh (g=9.8) 
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11/03/21

Thermochemistry. Answer, step by step please. (show work)
1N2 (g) + 3H2 (g) = 2NH3 (g) ∆H = -91.2 kJ a. Is this exothermic or endothermic? b. Rewrite the equation with the energy as either a reactant or a product. c. What quantity of heat is released... more
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Science Chemistry

11/02/21

The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
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11/02/21

Thermochemistry. Answer, step by step please. (show work)
1) 2C (s) + 2H2 (g)  1C2H4 (g) ∆H = 52.3 kJ a. Is this exothermic or endothermic?b. Rewrite the equation with the energy as either a reactant or a product.c. What volume of Ethene gas can be... more
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Science Chemistry

10/29/21

Calculate the frequency (in s–1) of a gamma ray photon that has an energy of 3.33 x10–13 J
Calculate the frequency (in s–1) of a gamma ray photon that has an energy of 3.33 x10–13 J
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Science Biology

10/29/21

Please help me with this Biology questionn:(
Use the following information to answer the next two questions. Muscle ContractionIn an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single... more
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10/28/21

Can someone please help me?

For the following problems, I had to refer to the reaction 2NH3 (g) ↔ N2 (g) + 3H2 (g), and ΔH = 92.2 kJ.1. What will be the effect on the concentration of H2 if the temperature decreases? A.... more
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10/28/21

Limiting Stoichiometry with showing steps
4.35 L of Butane (C4H10) is combusted with 26.50 L of Oxygen gas. What volume of each product is formed by this reaction? What volume of excess reactant remains?
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10/27/21

Can someone please help me and check-over my answers to these Chemistry problems?
For the following problems, I had to refer to the reaction 2NH3 (g) ↔ N2 (g) + 3H2 (g), and ΔH = 92.2 kJ.1. What will be the effect on the concentration of H2 if the temperature decreases? A.... more
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Science Chemistry

10/27/21

Can someone please help me with these problems and see if I got them correct?
For the reaction BaSO3 (s) ↔ BaO (s) + SO2 (g), the equilibrium constant is 0.345 M. What is the concentration of SO2 at equilibrium?A. 0.035 MB. 0.070 MC. 0.280 MD. 0.345 ME. 0.520 MFor the... more
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Science Chemistry

10/27/21

Are my answers to these Chemistry problems correct? (My answers are in bold.) Also, thank you for your kind help! I really do appreciate it.
What is the acid ionization reaction for HNO3?A. 2HNO3 ↔ H2 + N2 + 2O3B. HNO3 ↔ H+ + NO3C. HNO3 (aq) ↔ H+ (aq) + NO3 (aq)D. HNO3 (aq) ↔ H+ (aq) + NO3 - (aq)E. None of the Above Which of the... more
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Science Chemistry

10/26/21

Can someone please help me with this?
A solution with a pH of _______ is mildly acidic.A. 1B. 4C. 7D. 10E. 13A solution with a pH of _______ is highly basic.A. 1B. 4C. 7D. 10E. 13 A solution with a pH of _______ is highly acidic.A. 1B.... more
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Science Chemistry

10/26/21

Are my answers to my Chemistry homework correct?

_______ is a neutral solution.A. BloodB. Salt waterC. Pure waterD. MilkE. All of the Above_______ is mildly basic.A. Tomato juiceB. Pure waterC. CoffeeD. VinegarE. None of the AboveAcid rain is... more
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Science Chemistry

10/26/21

Can someone please check-over my answers to these Chemistry problems?
Le Chatelier’s principle states which of the following?A. When a stress is applied to an equilibrium, the reaction will shift in a way that relieves the stress and restores the equilibrium.B. When... more
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Science Biology

10/26/21

Write a short paragraph discussing why is it important for you to understand the transport mechanism in cells
Write a short paragraph discussing why is it important for you to understand the transport mechanism in cells and enumerate examples/situations of transport mechanism that you encounter in your... more
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10/25/21

AP chem question
A solution of 100.0 mL of 0.200 M KOH mixed with a solution of 200.0 ml of 0.150M NiSo4.a) Write the balanced chemical equation for the reaction that occursb) What precipitate forms?c) What is the... more
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Science Chemistry

10/23/21

Calculate the concentration of the dye Blue #1 if 0.1018.g are dissolved in 100.00mL of water. The molar mass of Blue #1 is 792.86 g/mol.
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10/22/21

Writing research papers.
You're assigned to write an academic research paper for your HS science class. Where do you start?What format should you use? How do I research the subject?What resources are acceptable?So many... more
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10/22/21

Please help me with this question
Mr. Jim had R total hip replacement 1 day ago. He's having trouble coughing up secretions after her surgery, complaining of SOB & a sensation of "tightness" in his chest, pale & sweating.... more
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10/22/21

What is the answer in the blank for light liquid and heavy liquid concerning specific gravity and percent error?
The format goes in this:Light liquid- Mineral Oil and Heavy liquid – NaCl soln 20%)250 mL graduated cylinder with the liquid to be tested up to the 200 ml mark.Hydrometer MethodResult: (for light... more
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10/22/21

chem question (redox)
How many electrons are being transferred in the reaction below when the reaction is balanced?(Cr2O4)^-2 + Cl^-3 -> Cr + Cl2
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Science Physics

10/21/21

Physics please if anyone can help
Mr. Herbert recorded the total flight time to be exactly 6.5 seconds using your knowledge of physics find out the following about the rocket :A) the max heightB) find the initial velocityC) Find... more
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Science Chemistry

10/21/21

STOICHIOMETRY CHEMISTRY
A certain type of gas is found inside a polyethylene container with a pressure equivalent to 721.0 torr. If thevalue of moles of the said gas is 12.01 moles, what would be the amount of pressure... more
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