4,347 Answered Questions for the topic Science

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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Science Physics

10/20/21

A spring scale… PLEASE HELP! :)

A spring scale is used to measure the weight of various objects. when a 100g empty glass bottle is placed on the scale, the spring stretches down 1.8cm. How much water should be poured into the... more
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Science Physics Physics

10/20/21

HOW CAN I SOLVE THIS? HELP
The height of the table is 4 m. by repeated measurements the range of values vary because it is not stretched straight, which causes the heights in the first three trials to be 3.35m, 4.20m, and... more
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10/20/21

Thermo Question Steady-Flow System
An air-conditioning system involves the mixing of cold air and warm outdoor air before the mixture is routed to the conditioned room in steady operation. Cold air enters the mixing chamber at 7°C... more
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10/19/21

ap chem question
For each of the following write the blanched, net ionic reaction.a) Solid zinc hydroxide is sprinkled into a solution of iron (III) acetateb) A solution of cesium chloride has bromine liquid... more
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10/19/21

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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