4,347 Answered Questions for the topic Science

Science Chemistry

05/16/21

hi, pls help me to solve this one using Gay-Lusasc’s Law
1. The pressure of a container of helium at 25°C is650 torr. If the sealed container is cooled down to2°C, what will the pressure be?2. A volume of the gas sample inside a containerexerts a... more
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Science Chemistry

05/15/21

hi, pls help me how to solve this one using avogadro's law
1. A 25.5 liter balloon holding 3.5 moles of heliumleaks. If we are able to determine that 2 moles ofhelium escaped before the balloon was sealed,what would be the new volume of the balloon?2. If a... more
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Science Chemistry

05/15/21

Can someone pls help me to answer this, plsss. Thank you!
1. A container holds 50 mL of nitrogen gas at 25°Cand a pressure of 736 mmHg. What will be itsvolume if the temperature increases to 40°C?2. 538 cm 3 of chlorine at 25°C will occupy whatvolume at... more
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Science Chemistry

05/15/21

Hi! pls help me to answer this science homework
1. A container holds 500 mL of CO 2 at 20°C and742 torr. What will be the volume of CO 2 if thepressure is increased to 805 torr and thetemperature is kept as is?2. A balloon contains 7.2 L of He.... more
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Science Biology Chemistry

05/15/21

Need help before the hour. Please!
Complete the neutralization reaction below by including the correct salt product. Use parentheses as needed; do not format subscripts in your answer.  Sr(OH)2 + HNO3 -> [salt] + H2O
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Science Biology Chemistry

05/15/21

need help within the hour. Please help!
Calculate the [H+] in a solution with a pH of 1.9must use decimals
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Science Biology Chemistry

05/15/21

I need help within the next hour. Help please!
Calculate the [OH-] in a solution with a pH of 12.9 must use decimals
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Science Biology Chemistry

05/15/21

I need help within the next hour. Please!
Equal volumes of 1M hydrochloric acid and 1M sodium hydroxide are mixed via a process known as titration. After mixing, at the equivalence point of the titration, the solution will be?weakly... more
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Science Chemistry

05/14/21

If the concentration of base used was 0.5 M and the volume of acid titrated was 25.0 mL, what was the concentration of the acid?
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05/14/21

Please help me with chemistry math problems: URGENT PLEASE ANSWER
What is the heat required to vaporize 90.8 g of liquid ethanol, C2H5OH, at its boiling point? The ΔH° of vaporization of ethanol is 39.3 kJ/mol. Use a molar mass with at least as many significant... more
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Science Chemistry

05/14/21

hi! pls i need your help on my homework, i literally don't know how to solve it
1. A container holds 500 mL of CO 2 at 20°C and742 torr. What will be the volume of CO 2 if thepressure is increased to 805 torr and thetemperature is kept as is?2. A balloon contains 7.2 L of He.... more
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05/14/21

Practice #1 – Limiting Reactants in Moles
    How many moles of water can be produced with 4.3 moles of H2 and 5.6 moles of O2? Which reactant is limiting? How many moles of the excess reactant will be left after the... more
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Science Chemistry

05/14/21

pls help me solve this i'm confused
6. How many degrees in Fahrenheit is a freshlycooked chicken if it has a Kelvin temperature of500?7. If the pressure in a container is half of thestandard atmospheric pressure, how muchkilopascals... more
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05/13/21

please help me with chemistry heat math problems

The heat of fusion of ice is 335 J/g. Calculate the heat liberated when 118 g of water at 0°C is frozen.A. -39.5 kJB. 39.5 kJ    C. -2.84 kJD. 2.84 kJE. some other answer
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05/13/21

Please help ,e with chemistry heat math problem.

What is the heat required to melt 62.0 g of solid ammonia, NH3, at its melting point? The ΔH° of fusion of ammonia is 5.97 kJ/mol. Use a molar mass with at least as many significant figures as the... more
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05/13/21

please help me with chemistry heat math problem.

What is the heat required to melt 77.4 g of solid diethyl ether, (C2H5)2O, at its melting point? The ΔH° of fusion of diethyl ether is 7.66 kJ/mol. Use a molar mass with at least as many... more
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05/13/21

Please help me with chemistry math problems

What is the heat required to vaporize 90.8 g of liquid ethanol, C2H5OH, at its boiling point? The ΔH° of vaporization of ethanol is 39.3 kJ/mol. Use a molar mass with at least as many significant... more
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05/13/21

please help me with chemistry and heat
Calculate the amount of heat needed to melt 2.0 kg of iron at its melting point (1809 K) given that: ΔHfus = 13.80 kJ/mol.A. 27,600 kJB. 25,000kJ    C. 494 kJD. 27.6 kJ
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05/13/21

please help me with chemistry and heat

What is the heat required to vaporize 54.3 g of liquid ammonia, NH3, at its boiling point? The ΔH° of vaporization of ammonia is 23.4 kJ/mol. Use a molar mass with at least as many significant... more
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05/13/21

500 mL of a 2.5 M solution of NaCl is left uncovered and 200 mL of the solvent evaporated out. What is the new molarity of the solution?
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05/13/21

How much water needs to be added to a 125 mL of a 5 M solution to make it a 1.5 M solution?
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05/13/21

How cells give shape to our body?

I had a query from almost an year. How do cells of a part of our body, let's say hands, know in what shape to make the hand grow? For example how do the cells know that after the joint near... more
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Science Biology

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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Science Biology

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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05/11/21

for help in biology chemistry biochemistry zoology botany microbiology Contact 03043535992

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