J.R. S.

10/15/18

Identifying charges

For each element, identify the charge of its most common ion.Br, Li, O, Al

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Answers •1

10/15/18

Some of the formulas below could be either molecular or empirical formulas; however, some could only be molecular formulas. Which of the following formulas must be molecular formulas? Select all... more

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Chemistry

10/15/18

Power of ten prefixes

Identify the power of ten that defines each of these prefixes.nano, kilo, centi, micro, milli, mega.

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Chemistry

10/15/18

Significant figures

How many significant figures are in 0.052000?

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Science Earth Science

10/15/18

We can also use radioactive decay of 14C (radiocarbon) into 14N...

We can also use radioactive decay of 14C (radiocarbon) into 14N (nitrogen) to date animal and plant remains. The half-life of 14C is approximately 5500 years. We measure the amount of 14C in a... more

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Chemistry

10/15/18

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

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Chemistry

10/15/18

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

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Chemistry

10/15/18

For the following equations, calculate the mass of NO produced from 32.0 g NH3 4NH3 + 5O2 → 4NO + 6H2O

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Chemistry

10/15/18

Find the mass of 2.76x1023 particles of C6H11OBr

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Chemistry

10/15/18

General Chemistry

A scuba diver that ascends to the surface too quickly can experience decompression sickness, which occurs when nitrogen that dissolves in the blood under high pressure, forms bubbles as the... more

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Math

10/14/18

The half-life of carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 66% of the carbon-14 expected in living matter, when did the tree die?

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Chemistry Acids And Bases Weak Base

10/13/18

Weak base in water, (Salt in Water) ?

What is the pH of a lithium cyanide solution prepared by dissolving 10.00gram of LiCN in water up to 500. mL? Hydrocyanic acid has a Ka-4.9x10^-10.> So far I get molarity of 0.607M but I am not... more

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Chemistry

10/13/18

If you combine 420.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

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Chemistry

10/13/18

If 6.200 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

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Chemistry

10/12/18

Specific heat of a metal

How much heat is needed to raise the temperature of 20.0 g of a substance (specific heat =1.80cal/g°C) from 50.0°C to 62.0°C ?

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Chemistry

10/12/18

Chemistry heat and specific heat

How many joules of heat are needed to raise the temperature of 10.0 g of aluminum from 22.8°C to 55.0°C, if the specific heat of aluminum is 0.921J/g°C ?

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Compounds Ions Chemisistry

10/12/18

Compounds and Ions

The ions Na+ and Mg2+ occur in chemical compounds, but not the ions Na2+ and Mg3+ do not. Explain.

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Chemistry

10/12/18

if it takes 1.25 min for 0.01 mol of he to effuse , how long will it take for the same amount of ethane ( c2H6) to effuse?

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Chemistry

10/12/18

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

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Chemistry

10/12/18

1. Calculate the pI of Histidine and illustrate how you arrived at your answer

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Chemistry

10/12/18

6. Sketch a titration curve for aspartic acid, and indicate the pKa values of all titratable groups. Also indicate the pH range in which the conjugate acid–base pair +1 Asp and 0 Asp will act

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Chemistry

10/12/18

10. Explain that Lipids are amphipathic and how this enables them to be used as component of biological membranes.

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Chemistry

10/12/18

Explain how pH, pKa and pI can be used to predict the mobility of an amino acid, in a direct-current electrical field.

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Math

10/12/18

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

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Answers •1

Math

10/12/18

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

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Answers •1

Identifying charges

Molecular formulas

Power of ten prefixes

Significant figures

We can also use radioactive decay of 14C (radiocarbon) into 14N...

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

For the following equations, calculate the mass of NO produced from 32.0 g NH3 4NH3 + 5O2 → 4NO + 6H2O

Find the mass of 2.76x1023 particles of C6H11OBr

General Chemistry

The half-life of carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 66% of the carbon-14 expected in living matter, when did the tree die?

Weak base in water, (Salt in Water) ?

If you combine 420.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

If 6.200 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

Specific heat of a metal

Chemistry heat and specific heat

Compounds and Ions

if it takes 1.25 min for 0.01 mol of he to effuse , how long will it take for the same amount of ethane ( c2H6) to effuse?

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

1. Calculate the pI of Histidine and illustrate how you arrived at your answer

6. Sketch a titration curve for aspartic acid, and indicate the pKa values of all titratable groups. Also indicate the pH range in which the conjugate acid–base pair +1 Asp and 0 Asp will act

10. Explain that Lipids are amphipathic and how this enables them to be used as component of biological membranes.

Explain how pH, pKa and pI can be used to predict the mobility of an amino acid, in a direct-current electrical field.

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

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J.R. S.

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Emmersion

Identifying charges

Molecular formulas

Power of ten prefixes

Significant figures

We can also use radioactive decay of 14C (radiocarbon) into 14N...

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

For the following equations, calculate the mass of Fe2O3 needed to produce 45.3 g CO Fe2O3 + 3C → 2Fe + 3CO

For the following equations, calculate the mass of NO produced from 32.0 g NH3 4NH3 + 5O2 → 4NO + 6H2O

Find the mass of 2.76x1023 particles of C6H11OBr

General Chemistry

The​ half-life of​ carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 66​% of the​ carbon-14 expected in living​ matter, when did the tree​ die?

Weak base in water, (Salt in Water) ?

If you combine 420.0 mL of water at 25.00 °C and 120.0 mL of water at 95.00 °C, what is the final temperature of the mixture? Use 1.00 g/mL as the density of water.

If 6.200 g of C6H6 is burned and the heat produced from the burning is added to 5691 g of water at 21 °C, what is the final temperature of the water?

Specific heat of a metal

Chemistry heat and specific heat

Compounds and Ions

if it takes 1.25 min for 0.01 mol of he to effuse , how long will it take for the same amount of ethane ( c2H6) to effuse?

calculate the density of O2 at STP ( 1 atm , 0 degrees celcius and at 25 degrees celsius and 760 mmhg

1. Calculate the pI of Histidine and illustrate how you arrived at your answer

6. Sketch a titration curve for aspartic acid, and indicate the pKa values of all titratable groups. Also indicate the pH range in which the conjugate acid–base pair +1 Asp and 0 Asp will act

10. Explain that Lipids are amphipathic and how this enables them to be used as component of biological membranes.

Explain how pH, pKa and pI can be used to predict the mobility of an amino acid, in a direct-current electrical field.

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

The mass of the moon is about 7.3x10^22kg. It would take approximately 26000000 moons to equal the mass of the sun. Determine the mass of the sun.

Still looking for help? Get the right answer, fast.

OR

J.R. S.

The half-life of carbon-14 is 5600 years. If a piece of charcoal made from the wood of a tree shows only 66% of the carbon-14 expected in living matter, when did the tree die?