4,347 Answered Questions for the topic Science

Science Math Chemistry

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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Science Math Chemistry

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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05/01/21

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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Science Math Physics Maths

05/01/21

HELP!!! What is the index of refraction of the unknown medium?
When moving from an unknown medium into air, light is internally reflected at any incident angle larger than 24 degrees. What is the index of refraction of the unknown medium?
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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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Science Chemistry

05/01/21

What is the mass of 6.53 X 10^23 atoms of Ag?
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04/30/21

Hi please help me with my homework as soon as possible please I have received no help whatsoever and I am so stressed please help me pleadr
3 Cu + 8HNO3 → 3 Cu(NO3)2  + 2 NO + 4 H2OIn the above equation, how many grams of water can be made when 13.5 moles of HNO3 are consumed? Round your answer to the nearest tenth. If you answer is a... more
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04/30/21

Please someone respond and actually help me with my chemistry homework quickly please

1.) 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2OIn the above equation, how many grams of N2 can be made when 7.7 moles of CuO are consumed?Round your answer to the nearest tenth. If you answer is a whole... more
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04/30/21

Hi many tutors have ignored my question but please help me with my chemistry homework as soon as possible please because no one has helped me
3 Cu + 8HNO3 → 3 Cu(NO3)2  + 2 NO + 4 H2OIn the above equation, how many grams of water can be made when 13.5 moles of HNO3 are consumed? Round your answer to the nearest tenth. If you answer is a... more
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04/30/21

What is the anion of this formula? Please help if possible. Thank you!
When NaCl dissociates in water, what is the anion? When Ca(OH)2 dissociates in water, what is the anion? 
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04/30/21

need help as soon as possible.. If possible. Thank you!
If a 1 M solution of Pb3(PO4)2 dissociates completely in water, what is the final [Pb2+]?
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04/30/21

I know that it is easy to bypass a question but please think about how I actually need real help desperately with my chemistry homework as soon as possible please
1.) 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2OIn the above equation, how many grams of N2 can be made when 7.7 moles of CuO are consumed?Round your answer to the nearest tenth. If you answer is a whole... more
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04/30/21

Need help solving before midnight! Please check my account if possible. Thank you so much!
If a 3.7 M solution of Pb3(PO4)2 dissociates completely in water, what is the final [PO4-3]?
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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

Need help classifying these things. Please and thank you!
classify each property as belonging to acid, base, or bothHydroxide ions           neutral         acid         both         base      Hydronium... more
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04/30/21

Copy and complete Table 3. Compare the chromosome number in the organisms before, during, and at the end of meiosis. Indicate whether the chromosome number is haploid or diploid.
^^ this is the table
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04/30/21

Copy and complete Table 3. Compare the chromosome number in the organisms before, during, and at the end of meiosis. Indicate whether the chromosome number is haploid or diploid.
^^ this is the table
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04/30/21

Please help me because I have needed help with my chemistry homework for many hours

3 Cu + 8HNO3 → 3 Cu(NO3)2  + 2 NO + 4 H2OIn the above equation, how many grams of water can be made when 13.5 moles of HNO3 are consumed? Round your answer to the nearest tenth. If you answer is a... more
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04/30/21

I know that it is easy to bypass a question but please think about how I need help desperately with my chemistry homework as soon as possible please
1.) 2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2OIn the above equation, how many grams of N2 can be made when 7.7 moles of CuO are consumed?Round your answer to the nearest tenth. If you answer is a whole... more
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Science Chemistry

04/30/21

What is the pOH of a solution...
What is the pOH of a solution that contains [H3O+] of 3.10 x 10-9 M ?a.8.49b.6.49c.7.49d.5.49
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04/30/21

A car's airbag needs to be filled with 140 liters of nitrogen gas. Using 2NaN3 → 2Na+3N2 , determine how many grams of sodium azide (NaN3) will be required to produce the 140 liters of nitrogen gas.

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04/29/21

Biology question.....Forgot how I did this how does this answer get to 800?
A test tube is inoculated with 100 cells of a bacterial strain that has a generation time of 30 minutes. The carrying capacity of the test tube for this strain is 6 billion cells. What will the... more
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04/28/21

Chest X Ray Medical Question

A patient is brought to the emergency room following a motor vehicle accident. He was not wearing a seat belt, and has considerable soft-tissue bruising about his anterior chest, where he... more
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Science Math Physics

04/28/21

Help with a physics problem
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Science Math Physics

04/28/21

Help with a physics problem
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