J.R. S.

Mozila Firefox

12/12/18

Mozila Firefox is a competitor of the internet explorer. True or False

Is it true that mozila Firefox is a competitor of the internet explorer? Or is it false?

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Chemistry

12/12/18

A scientist measures the standard enthalpy change for the following reaction to be 100.8 kJ :

3Fe2O3(s) + H2(g)2Fe3O4(s) + H2O(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of Fe2O3(s) is ____kJ/mol.

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Science Art Chemistry

12/11/18

Polystyrene pseudo plastic?

I’m asking this question for an artistic project I’m working on. After polystyrene has dissolved in acetone, how firm and heavy is the resulting pseudo plastic after it hardens?

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Organic Chemistry

12/11/18

Besides chlorine gas after mixing these two chemicals what liquid byproduct is left? I assume the liquids will not continuously evaporate into a toxic gas as that only seems to happen for a few... more

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English Synonymous

12/11/18

Synonym of freedom

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Math

12/11/18

jims trip took 3 hours and traveled at a rate of 65 miles per hour. How far did he travel?

algebric form if possible

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Chemistry

12/11/18

3. Stacy reads that a 50 : 50 mixture of methanol and water is not only best for keeping a car’s radiator from freezing, but it will also take a higher temperature to make the car’s radiator boil

-over. Design an experiment to test this finding. You have a hot plate, water, methanol, graduated cylinders to measure volume, several glass beakers, and a thermometer at your disposal. Be sure to... more

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Ap Chemistry Heat Heat Of Vaporization

12/11/18

Ap Chem question

How many kilojoules of heat are absorbed when 1.25 mol is converted from liquid at 15.0℃ at vapor at 25.0℃? The specific heat of (l) is 4.18 J/g℃. The heat of vaporization of water is 44.0... more

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Chemistry

12/11/18

Sodium-24 is used to treat leukemia and has a half-life of 15 hours. A patient was injected with a salt solution containing sodium-24. What percentage of the 24Na remained after 48 hours?

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Science

12/10/18

Saliva breaking down ritz crackers into molecules of glucose is what type of change?

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Chemistry

12/10/18

How many joules of heat are necessary to raise the temperature of 350ml of water from 1.00 °C to 5.00 °C?

I don't understand how to solve this problem. My teacher did not explain it very well to me and I have problems figuring out how to put it into the equation, I know how to do the calculations, but... more

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Chemistry

12/10/18

Find the number of moles of carbon in 20g.

I have this question for my chemistry homework and not sure what to do here. The next question is:How many carbon atoms are there in the previous question?

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Chemistry

12/10/18

Can someone solve this problem? (chemistry)

4.2 grams of metallic bonding X-Mg (where X is a trivalent metal) reacts with HCl and 3.99 liters of H are released. Knowing that the percentage of Mg in the bond is 91.4% and N(number of neutrons)... more

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Chemistry

12/10/18

How many grams of H2 are needed to react with 2.60 g of N2?

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Chemistry

12/10/18

If you have 3.01 g of H2, how many grams of NH3 can be produced?

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Chemistry

12/10/18

How many moles of KBr(119g/mol) are in 1000mL of a 2.38% (w/v) solution?

How many moles of KBr(119g/mol) are in 1000mL of a 2.38% (w/v) solution? I don’t understand what the w/v is supposed to mean in this question. Or how to solve it.

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Chemistry

12/10/18

MULTIPLE CHOICE

The volume of a dry gas is 4.00 L at 15°C and 745 torr. What volume will the gas occupy at 40°C and 700 torr?a. 3.46 Lb. 3.92 Lc. 4.08 Ld. 4.63 L

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Answers •2

Biochemistry Organic Chemistry Chem

12/10/18

C12H22O11(aq)+H2O(g)->4C2H5OH(l)+4CO2(g) Find the theoretical yield and the percent yields of ethanol if 680.g sucrose undergoes fermentation and 303.5g ethanol is obtained.

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Chemistry Stoichiometry

12/10/18

if 25 ml hcl acid with a concentration of .1234 M is neutralized by 23.45 mL of Ca(OH)2 what is the concentration of the base?

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Chemistry

12/10/18

How much of a 814.2 mg gold-198 sample will remain after 13.5 days?

Gold-198 has a half-life of 2.7 days. How much of a 814.2 mg gold-198 sample will remain after 13.5 days?

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Calorimeter Problem

12/10/18

Can you help me with this calorimeter problem ?

In a coffee cup calorimeter 100.0g of H2O and 100mL of HCI are mixed. The HCI had an initial temperture of 44.6°C and the water was originally at 24.6°C. After the reaction the temperature of both... more

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Redox

12/10/18

Which of the following metals when reacting with 1.0 M Zn2+ at 25°C will produce the greatest voltage? Select one: A. Mg B. Pb C. Al D. Ag

Which of the following metals when reacting with 1.0 M Zn2+ at 25°C will produce the greatest voltage?Select one:A. MgB. PbC. AlD. Ag

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Chemistry

12/10/18

1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid decane into gaseous carbon dioxide and gaseous water

suppose 0.490 kg of decane are burned in air at a pressure of exactly 1 atm and a temperature of 110 *C. Calculate the volume of carbon dioxide gas that is produced. Round your answer to 3... more

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Molarity Molality

12/09/18

How to calculate

A solution is made dissolving 25grams of NaCI in enough water to make 210 grams of solution. Assuming the volume of resulting solution is 405 mL calculate

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Chemistry

12/09/18

Please Help!!!!!

hot air balloon is filled with 1.51 × 106 L of an ideal gas on a cool morning (11 °C). The air is heated to 117 °C. What is the volume of the air in the balloon after it is heated? Assume that none... more

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Mozila Firefox is a competitor of the internet explorer. True or False

A scientist measures the standard enthalpy change for the following reaction to be 100.8 kJ :

Polystyrene pseudo plastic?

chemistry/ bleach vinegar

Synonym of freedom

jims trip took 3 hours and traveled at a rate of 65 miles per hour. How far did he travel?

3. Stacy reads that a 50 : 50 mixture of methanol and water is not only best for keeping a car’s radiator from freezing, but it will also take a higher temperature to make the car’s radiator boil

Ap Chem question

Sodium-24 is used to treat leukemia and has a half-life of 15 hours. A patient was injected with a salt solution containing sodium-24. What percentage of the 24Na remained after 48 hours?

Saliva breaking down ritz crackers into molecules of glucose is what type of change?

How many joules of heat are necessary to raise the temperature of 350ml of water from 1.00 °C to 5.00 °C?

Find the number of moles of carbon in 20g.

Can someone solve this problem? (chemistry)

How many grams of H2 are needed to react with 2.60 g of N2?

If you have 3.01 g of H2, how many grams of NH3 can be produced?

How many moles of KBr(119g/mol) are in 1000mL of a 2.38% (w/v) solution?

MULTIPLE CHOICE

C12H22O11(aq)+H2O(g)->4C2H5OH(l)+4CO2(g) Find the theoretical yield and the percent yields of ethanol if 680.g sucrose undergoes fermentation and 303.5g ethanol is obtained.

if 25 ml hcl acid with a concentration of .1234 M is neutralized by 23.45 mL of Ca(OH)2 what is the concentration of the base?

How much of a 814.2 mg gold-198 sample will remain after 13.5 days?

Can you help me with this calorimeter problem ?

Which of the following metals when reacting with 1.0 M Zn2+ at 25°C will produce the greatest voltage? Select one: A. Mg B. Pb C. Al D. Ag

1. Write a balanced chemical equation, including physical state symbols, for the combustion of liquid decane into gaseous carbon dioxide and gaseous water

How to calculate

Please Help!!!!!

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