Laser_3

If 200.mL of a 0.00500M solution of AgNO3 were added to 400.mL of a 0.0100M solution of Na2CrO4, ...

If 200.mL of a 0.00500M solution of AgNO3 were added to 400.mL of a 0.0100M solution of Na2CrO4, ...

If 200.mL of a 0.00500M solution of AgNO3 were added to 400.mL of a 0.0100M solution of Na2CrO4, would Ag2CrO4 precipitate? The Ksp of Ag2CrO4 is 1.1 x 10^-12

nf_7138   1947   1 Reply

duddy

physical chemestry -Physical Equilibrium - help :)?

physical chemestry -Physical Equilibrium - help :)?

A container is filled with ice in a pressure of 1 atm.
The container is in a bath that keep its Temperature constant - 273.15 K.
We cover the ice with a piston, and we press the piston with 100 atm.
We wait until the system reaches equ

asaf   2526   9 Replies

asaf

Physical Chemistry - Equilibrium?

Physical Chemistry - Equilibrium?

A calcite exist in 2 Crystal forms:
1) Calcite
2) Aragonite
The transfer reaction between them is given: CaCO3 (ara) -> CaCO3 (cal).

In addition, given is the deltaG (change in free energy of the reaction) at 298K, 1bar:

asaf   1536   2 Replies

asaf

Need Help Please --Thermochemistry

Need Help Please --Thermochemistry

The dilution of a concentrated acid in water is a very exothermic process. When mixing the acid and water, should the acid be added to the water or should the water be added to the acid? Explain ..please&thank you:)

Roro   1172   2 Replies

Roro

some random conversion problem

some random conversion problem

So there is 12µM and 5mM. I need to convert 12µm to mM. What is the conversion of it. would it be 1.2 x10^-5? Somehow it doesnt look right to me.

In this other problem
they have 4.74 x 10^11 µm^2 -> .474 m^2    The conver

emily   1593   3 Replies

bio_man

Distinguish between the mass of a molecule and the mass of a mole, using NaCl in

Distinguish between the mass of a molecule and the mass of a mole, using NaCl in

Distinguish between the mass of a molecule and the mass of a mole, using NaCl in your example.
B.   Calculate the mass of a mole of NaCl in g, using the mass of one Da (amu).
C.   Calculate the mass of a dozen NaCl molecules, a dozen donuts, a

ppk   1209   1 Reply

bio_man

How should you explain the different behavior of these liquids to your dad?

How should you explain the different behavior of these liquids to your dad?

You are helping your dad prepare food in the kitchen. Dad has a tablespoon of water in one hand and a tablespoon of vegetable oil in the other, when he trips over the rug and spills both spoons on the countertop. Dad notices that the oil forms a thin

ppk   957   1 Reply

bio_man

Write the chemical formula for the molecule drawn below. Which class of organic

Write the chemical formula for the molecule drawn below. Which class of organic

Write the chemical formula for the molecule drawn below. Which class of organic molecule does it belong to? Is it most likely polar or nonpolar?

ppk   1966   1 Reply

bio_man

How many neutrons are in the nucleus of the radioisotope Iodine-131?

How many neutrons are in the nucleus of the radioisotope Iodine-131?

How many neutrons are in the nucleus of the radioisotope Iodine-131?

ppk   2240   1 Reply

bio_man

Using NaCl to illustrate, explain atomic mass and molecular mass

Using NaCl to illustrate, explain atomic mass and molecular mass

Using NaCl to illustrate, explain atomic mass and molecular mass, and an estimated and true mass of one molecule. Your explanation should include the appropriate measurement unit for each, and why the estimated and true masses are not exactly identic

ppk   1124   1 Reply

bio_man

Chemical characterization reveals that carbon, hydrogen, and oxygen are present

Chemical characterization reveals that carbon, hydrogen, and oxygen are present

You are a student intern in the research and development department of a pharmaceutical company. You have discovered a compound that destroys the common cold virus in cultured human cells. Chemical characterization reveals that carbon, hydrogen, and

ppk   1532   1 Reply

bio_man

Your swimming buddy Mark jumped into a pool parallel to the water surface.

Your swimming buddy Mark jumped into a pool parallel to the water surface.

Your swimming buddy Mark jumped into a pool parallel to the water surface. When he stood up, he yelled “ouch” and you noticed that the skin on his chest and belly looked red and irritated. How would you describe the properties of water to explain to

ppk   987   1 Reply

bio_man

Ionic bonds are considered to be strong chemical bonds.

Ionic bonds are considered to be strong chemical bonds.

Ionic bonds are considered to be strong chemical bonds. Yet, ions dissociate in water. Explain this apparent contradiction.

ppk   1612   1 Reply

bio_man

Introduction to Chemistry with Lab

Introduction to Chemistry with Lab

Hi everyone I am new to the forum! If I do this wrong please let me know. I need help with this particular discussion board. Water is ubiquitous and necessary for life on our planet. Describe the numerous unique properties of water and how it support

lena213   8472   4 Replies

lena213

Define polar covalent, nonpolar covalent, ionic, and hydrogen bonding

Define polar covalent, nonpolar covalent, ionic, and hydrogen bonding

Define polar covalent, nonpolar covalent, ionic, and hydrogen bonding. Which of these bonds involves more than one molecule? Which of these bonds is/are important in determining the properties of water? Explain.

ppk   2826   1 Reply

bio_man

Rate determining step

Rate determining step

You are given the following reaction:
A + 2B ? C

Three experiments were done to determine the rate law for this reaction. The following results were obtained:
Trial 1: [A] = 0.1, = 0.05, Initial Rate = 1 x 10-4
Trial 2:

spliceofslife   1290   2 Replies

chemb

What is the sign on S for the following reactions?

What is the sign on S for the following reactions?

What is the sign on \({\Delta}\)S for the following reactions?
a.   2 C8H18(l) + 25 O2(g)  16 CO2(g) + 18 H2O(g)
b.   NaCl(s)  Na+(aq) + Cl–(aq)
c.   1 N2(g) + 3 H2(g)  2 NH3(g)

mikael   974   1 Reply

chemb

According to the label, a serving of Reduced Fat TriscuitTM crackers

According to the label, a serving of Reduced Fat TriscuitTM crackers

According to the label, a serving of Reduced Fat TriscuitTM crackers has 3 g fat, 22 g carbohydrate, and 3 g protein. How many Calories are in a serving?

mikael   1237   1 Reply

chemb

What is the lattice energy of KI ( Hsoln =+21.5 kJ/mol) and MgCl2 ( Hsoln = –150

What is the lattice energy of KI ( Hsoln =+21.5 kJ/mol) and MgCl2 ( Hsoln = –150

What is the lattice energy of KI ( Hsoln =+21.5 kJ/mol) and MgCl2 ( Hsoln = –150 kJ/mol)? Use Table 13.1 to determine heat of hydration.

mikael   4169   1 Reply

chemb

Under what temperature conditions are the following reactions spontaneous?

Under what temperature conditions are the following reactions spontaneous?

Under what temperature conditions are the following reactions spontaneous?
a.   NH4Cl(s) + OH–(aq) NH3(g) + H2O(l) + Cl–(aq)        endothermic
b.   2 NO(g) + O2(g) 2 NO2(g)       exothermic

mikael   1352   1 Reply

chemb

For the reaction, 2 H2 + O2 2 H2O, if the rate of disappearance of hydrogen gas

For the reaction, 2 H2 + O2 2 H2O, if the rate of disappearance of hydrogen gas

For the reaction, 2 H2 + O2 2 H2O, if the rate of disappearance of hydrogen gas is –0.012 M/s, what is the rate for the disappearance of oxygen and the appearance of water?

mikael   1051   1 Reply

chemb

What is the heat of solution and the dissolution reaction if when 1.893 g lithiu

What is the heat of solution and the dissolution reaction if when 1.893 g lithiu

What is the heat of solution and the dissolution reaction if when 1.893 g lithium fluoride dissolves in 250.0 mL water, the temperature changes from 23.69 °C to 19.59 °C?

mikael   1364   1 Reply

chemb

Which of the following statements is not true concerning the following aqueous equilibrium?

Which of the following statements is not true concerning the following aqueous equilibrium?

1.
(Points: 1)     Which of the following statements is not true concerning the following aqueous equilibrium?
H+(aq) + NO3-(aq) <=> HNO3 (aq)


 a. The equilibrium lies to the left.
 b. The equilibrium

mikael   2590   1 Reply

chemb

Thermochemistry

Thermochemistry

True OR False
1.Under constant pressure conditions, a+q value for the surroundings is communicated as a -H for the system
2.If the molar enthalpy of fusion for water is 6.03 KJ/mol, then the molar enthalpy of freezing for water is -6.03kj/m

Roro   1517   2 Replies

skmbasha70

Chemistry

Chemistry

Which is necessary for a chemical reaction to occur?


 reactant molecules must collide

 collisions must be of a certain energy

 neither of these two choices

 both of these choices

lena213   1238   3 Replies

star

MELTING POINT

MELTING POINT

WHY IS IT ESSENTIAL TO HEAT THE SAMPLE SLOWLY AND STEADILY AS THE MELTING POINT TEMPERATURE IS APPROACHED??

JOJO   2625   3 Replies

duddy

Chemistry

Chemistry

Hey  everyone I still need help with the following assigment if anyone can help out.  What might alligators (like the one that fell asleep in Ch. 8!) in Florida, seals in the North Sea, salmon in the Great Lakes, and you have in commo

lena213   1155   2 Replies

lena213

What is the common ultimate source of energy for all life on earth?

What is the common ultimate source of energy for all life on earth?

What is the common ultimate source of energy for all life on earth? Which types of organisms capture this energy? How do humans acquire this energy?

ppk   3678   1 Reply

star

You have spent the day on the beach, basking in the sun.

You have spent the day on the beach, basking in the sun.

You have spent the day on the beach, basking in the sun. Why were your cells unable to capture the energy of the sun to do work?

ppk   1444   1 Reply

star

Based on the facts about chemical equilibria in animal systems

Based on the facts about chemical equilibria in animal systems

Based on the facts about chemical equilibria in animal systems, indicate for each summary reaction below if it is reversible or irreversible (don’t worry about balancing the reactions). Explain the lack of reversibility. In what kind of system would

ppk   1112   2 Replies

DJ

Distillation

Distillation

Why is t dangerous to heat a liquid in a distilling apparatus that is closed tightly at every joint and has no vent to the atmosphere?

JOJO   1156   1 Reply

chemb

Distilling flask

Distilling flask

Why should a distilling flask be filled to not more than two-thirds of its capacity at the beginning of a distillation procedure?

JOJO   4151   1 Reply

chemb

Distillaion appartus

Distillaion appartus

Why is it important that the cooling water in a distillation apparatus enter the condenser jacket at the lower end and exit at the upper end, and not vice versa?

JOJO   2201   2 Replies

chemb

The confirmations of Propane

The confirmations of Propane

Do you expect the energy difference between staggered and eclipsed conformations in propane to be larger than, equal to, or smaller than the energy difference in ethane?? Explain.

JOJO   1006   2 Replies

JOJO

Write out the Nernst and GHK equations, and explain the significance of each. De

Write out the Nernst and GHK equations, and explain the significance of each. De

Write out the Nernst and GHK equations, and explain the significance of each. Define equilibrium potential.

ppk   1208   1 Reply

duddy

HELP!

HELP!

Do you expect the energy difference between staggered and eclipsed conformations in propane to be larger than, equal to, or smaller than the energy difference in ethane?? Explain.

JOJO   1530   1 Reply

ppk

Need Help on Chemistry Exam Review

Need Help on Chemistry Exam Review

1. Carbon can be progressively be oxidized in a series of organice reactions. Determine the oxidation number of carbon in each of the following compounds in the following series of oxidation.
-Ethane
-Ethanol
-Ethanal
-Ethanoic Ac

Roro   1313   4 Replies

Roro

Discuss the distinction between a graduated pipette and a volumetric pipette. Volumetric pipettes ...

Discuss the distinction between a graduated pipette and a volumetric pipette. Volumetric pipettes ...

Discuss the distinction between a graduated pipette and a volumetric pipette. Volumetric pipettes are used to transfer one specified volume of liquid while graduated pipettes are used to transfer volumes other than specific volumes for which volumetr

vern   3661   N/A

vern

explain equation

explain equation

Would the dehydration of 2-methylcyclohexanol yield a single alkene? Explain, using equations.

Chris   1694   1 Reply

ppk

Assuming that charcoal and sugar are the main impurities in a sample of crude acetanilide, explain ...

Assuming that charcoal and sugar are the main impurities in a sample of crude acetanilide, explain ...

Assuming that charcoal and sugar are the main impurities in a sample of crude acetanilide, explain how recrystallization from water would remove each.

Brii   8804   2 Replies

lewis