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Science Chemistry

02/06/23

need help with chem question please

"Determine the vapor pressure and the vapor pressure lowering of a solution made from 460.0mL of water and 218.2g of the solute, glucose (molar mass = 180.157g•mol-1), at a temperature of... more

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Science Chemistry

02/06/23

Chemistry question

"Determine the mass of a 1.15L aqueous solution of sucrose (C12H22O11) that is isotonic with seawater given the average osmotic pressure of seawater is 30.0 atm at 25°C."

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Science Chemistry

02/04/23

Chemistry question

"Silver chloride is soluble in concentrated ammonia forming the complex diamminesilver(I) ion complex, [Ag(NH3)2]+. If the solution containing the complex ion is acidified, silver chloride... more

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Science Chemistry

02/02/23

For retention time locking, can you use your internal standard as a locking compound?

I am setting up a calibration curve for a group of external standards. For this I am using the internal standard calibration method. My internal standard sits nicely in the middle of the spectrum.... more

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Science Chemistry

01/31/23

Need assistance with this question for chem

"Consider a room with the following dimensions: 10.00ft x 12.00ft x 9.00ft. A “cool-mist” vaporizer, with a capacity 2.50L, is used to add moisture to dry air in a room at 23.4oC. The vapor... more

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Science Chemistry

01/30/23

Help with chem question

"A solution containing both barium nitrate and silver nitrate is added to a solution of the unknown sodium salts used in this exercise. What anion(s) will not produce a precipitate? What test could... more

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Science Chemistry

01/30/23

Can someone please help with this chem question?

"Using the solubility table, identify the following anions from the information given. Write the net ionic equtions that produce a precipitate.(a) Its barium salt is insoluble in water but its... more

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Science Physics

01/27/23

An elevator lifts 5 passengers 30 meters in 24 seconds. The power is 15,000 watts. What is the total weight of the elevator and passengers

i am in 8th grade and need semi-simple terms please.

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Science

01/24/23

In 17.2 seconds, a shopping cart is pushed 15.6 meters towards the right. What is the velocity of the cart?

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Science Chemistry

01/22/23

If you had Pr6O11 + HNO3 and want to form Pr(NO3)3 * 6H2O, how would you figure out the number of grams of Pr6O11 and HNO3 you need?

If you had Pr6O11 + HNO3 and want to form Pr(NO3)3 * 6H2O, how would you figure out the number of grams of Pr6O11 and HNO3 you need to form the Pr Nitrate Hexahydrate?Assume the HNO3 is 68%.Pr6O11:... more

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Science Math Chemistry Physics

01/21/23

Im not sure how to answer any of these questions, can someone explain each stage?

Acetic acid and acetone are used for the purification of PLA production. A liquid mixture of acetic acid and acetone is in vapour liquid equilibria (VLE) at 100 °C. The mole fraction of acetic... more

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Science Chemistry

01/19/23

Give the formula for tetrasilicon heptabromide.

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Science Physics

01/18/23

Where a proton would experience zero net force

Consider two charges, where one (+3.80 nC) is at the origin and the other (-14.4 nC) is at the position x = 4.51 cm.Find the x-coordinate where a proton would experience zero net force.I am... more

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Science Chemistry

01/13/23

Why do the orbitals at different energy levels overlap while electrons cannot jump between energy levels without absorbing or releasing energy?

Also, looking at their orbitals, how can electrons in 2p shell be as close to the nucleus as 2s or 1s electrons for "90% of their time"? Because how can we get different energy levels like this,... more

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Science

01/10/23

true or false atoms are large enough to be seen to be with a compound light microscope

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Science

01/06/23

All four daughter cells that are produced at the end of telophase II are genetically identical.

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Science Chemistry Organic Chemistry

12/29/22

Assorted AP Chemistry -- radii, formal charges, & intermolecular forces

a.) Using principles of atomic structure, explain why the atomic radius of Kr is less than the ionic radius of Se²⁻.The boiling point of SeOF2 (diagram D) is less than the boiling point of SeOCl2... more

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Science

12/13/22

What is forensics science and what do these kinds of scientists do in their work?

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Science Math Physics

12/13/22

A football player kicked a football ball at 31 meters/second at an angle of 50° from the ground.

What is the flight time of the ball? What is the range of the kick? What is the maximum height of the kick?

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Science Math Physics

12/13/22

A bomber flying horizontally at 120 meters/second drops a bomb from an altitude of 240 meters.

How long does it take for the bomb to hit the ground?

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Science Biology

12/08/22

What type of cell signaling does Cholera deal in?

I can not figure it out at all no matter what I search. Cholera toxins go through G-proteins in the signal transduction pathway, but what specific type of cell singling pathway does this virus go... more

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Science Math Geography Mechanical Engineering

12/06/22

The maximum effective precipitation for a basin is shown in the table below.

Determine the hydrograph. The basin has the following characteristics drainage area of 27 km2 , the length of the river is 8 km and the gradientTime (h) Precipitation (mm) 1 7 2 10 3... more

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Science Biology Chemistry Microbiology

12/05/22

Oxidative stress index

Hello, I need to do a test on the rancimat lab equipment for oxidative stress index. I have never used this before. I have one sample of Dadex GT-2 NGM. Which is a blend of mixed tocopherols. Can... more

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Science Math English Spanish

12/05/22

Can’t make payments to Wyzant lesson anymore

I can’t use Wyzant anymore because it requires a zip code for payments and I don’t live in the U.S. I never had this problem in the past but I recently got a notification saying that my account had... more

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Science Chemistry

12/05/22

Can someone please help me solve this question

By observing the decomposition reaction, as the unknown mixture was being heated a liquid was formed, towards the end of the heating, the liquid was no longer present only a solid is observed.... more

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need help with chem question please

Chemistry question

Chemistry question

For retention time locking, can you use your internal standard as a locking compound?

Need assistance with this question for chem

Help with chem question

Can someone please help with this chem question?

An elevator lifts 5 passengers 30 meters in 24 seconds. The power is 15,000 watts. What is the total weight of the elevator and passengers

In 17.2 seconds, a shopping cart is pushed 15.6 meters towards the right. What is the velocity of the cart?

If you had Pr6O11 + HNO3 and want to form Pr(NO3)3 * 6H2O, how would you figure out the number of grams of Pr6O11 and HNO3 you need?

Im not sure how to answer any of these questions, can someone explain each stage?

Give the formula for tetrasilicon heptabromide.

Where a proton would experience zero net force

Why do the orbitals at different energy levels overlap while electrons cannot jump between energy levels without absorbing or releasing energy?

true or false atoms are large enough to be seen to be with a compound light microscope

All four daughter cells that are produced at the end of telophase II are genetically identical.

Assorted AP Chemistry -- radii, formal charges, & intermolecular forces

What is forensics science and what do these kinds of scientists do in their work?

A football player kicked a football ball at 31 meters/second at an angle of 50° from the ground.

A bomber flying horizontally at 120 meters/second drops a bomb from an altitude of 240 meters.

What type of cell signaling does Cholera deal in?

The maximum effective precipitation for a basin is shown in the table below.

Oxidative stress index

Can’t make payments to Wyzant lesson anymore

Can someone please help me solve this question

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