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465 Answered Questions for the topic AP chemistry

Ap Chemistry Science Chemistry

01/23/18

How do I calculate the mole fraction of methanol?

The normal boiling point of methanol is 64.7°C. A solution  containing a nonvolatile solute dissolved in methanol has a vapor pressure of 710.0 torr at 64.7°C. What is the mole fraction of the... more
Ap Chemistry Math Science

01/15/18

How do I solve this problem on the critical point of NH3?

The critical point of NH3 is 132°C and 111 atm and the critical point of N2 is -147°C and 34 atm. Which of these substances cannot be liquefied at room temperature no matter how much pressure is... more
Ap Chemistry Math Science

01/15/18

How do I solve this problem on air conditioners and evaporation?

In regions with dry climates, evaporative coolers are used to cool the air. A typical electric air conditioner is rated at 1.00×10^4 Btu/he. What quantity of water must be evaporated each hour to... more
Ap Chemistry Math Science

01/15/18

How do I solve this Chemistry problem on the phase changes of water?

A 20.0-g sample of ice at -10°C is mixed with 100.0 g of water at 80°C. Calculate the final temperature of assuming no heat loss to the surroundings. The heat of capacities of ice and water are... more
Ap Chemistry Math Science

01/15/18

How do I solve this AP Chemistry on Boron Nitride?

Boron Nitride ( BN) exists in two forms. The first is a slippery solid former from the reaction from BCl3 and NH3, followed by heating in a ammonia atmosphere at 750°C. Subjecting the first form of... more
Ap Chemistry Science Chemistry

01/14/18

How do I solve this problem on methyl salicylate and methyl 4-hydroxybenzoate?

Methyl salicylae has a melting point of -8°C.   methyl 4-hydroxybenzoate, another molecule with the exact  same molecular formulabhas a melting point of 127°C.   Why is there such a large... more
Ap Chemistry Science Chemistry

01/13/18

Can you help me with this problem on diethyl ether?

Diethyl ether was one of the first chemicals used as an anesthetic. At 34.6°C, diethyl ether has a vapor pressure of 760 torr, and at 17.9°C, it has a vapor pressure of 400 torr. What is the heat... more
Ap Chemistry Chemistry Physics

01/13/18

What role does humidity play in how our bodies regulate temperature?

A common response hearing that the temperature in New Mexico is 105°F is, "It's not that bad; it's a dry heat", whereas at the same time, the summers in Atlanta, Georgia are the characterized as... more
Ap Chemistry Chemistry Physics

01/13/18

How does evaporation of alcohol remove heat energy from a person's body?

When a person has a severe fever, one therapy used to reduce the fever is an "alcohol rub". Explain how the evaporation of alcohol from a person's skin removes heat energy from the body.
Ap Chemistry Science Chemistry

01/11/18

How do I solve this Chemistry problem on Phase Changes?

The molar heat of fusion of sodium metal is 2.60 kJ/lol, but it's heat of vaporization is 97.0 kJ/lol   A. Why is its heat of vaporization so much larger than the heat of fusion?   B. What... more
Ap Chemistry Science Chemistry

01/11/18

How do I calculate the normal boiling point of CCl4?

CCl4 has a vapor pressure of 213 torr at 40°C and 836 torr at 80°C. What is the normal boiling point  CCl4?
Ap Chemistry Science Chemistry

01/11/18

Can you help me with the problem on vapor pressure?

The temperature inside a pressure cooker is 115°C. Calculate  the vapor pressure of the water inside the pressure cooker. What would the temperature be if the vapor pressure was 3.5 atm?
Ap Chemistry Math Science

01/11/18

How do I calculate the boiling point of water at a specific atmospheric pressure?

In Breckenridge, Colorado, the typical atmospheric pressure is 520 tore. What is  the boiling point of water in Breckenridge? Delta H (vaporization)= 40.7 kJ/mol.
Ap Chemistry Science Chemistry

01/10/18

How do I solve this AP Chemistry problem?

A certain metal fluoride crystallized in such  a way that the fluoride ions occupy simple cubic Latrice sites, while the metal ions occupy the body centers of the half cubes. What is the formula of... more
Ap Chemistry Chemistry

12/28/17

AP Chemistry Spectra

The link below is an image that is to be used to help solve the problem: https://prnt.sc/hsqdao   The question is as follows: The above mess spectra is for the hypochlorite ion, CLO-. Oxygen... more
Ap Chemistry Chemistry Orbitals

12/26/17

AP Chemistry Orbital Diagram of Neutral Oxygen Atom

The link below correlates to the question: http://prntscr.com/hsqjdg   I already filled out the diagram (A) I am just having difficulty answering the question:   (B) Using your diagram above,... more
Ap Chemistry Chemistry Pes

12/26/17

AP Chemistry PES

The link below is the picture that correlates with the question: http://prntscr.com/hsqi56   Here's the question:   The above PES belongs to a neutral chlorine atom   (A) What wavelength of... more
Ap Chemistry Chemistry Chem

12/24/17

AP Chemistry Question

Which of the following statements best explains why phosphorus ions tend to have a charge of -3?   (A) Phosphorus atoms want to gain 3 electrons in order to fill their p-subshell (B) Phosphorus... more
Ap Chemistry Chemistry Chem

12/24/17

Which type of radiation would be most useful in examining the dimensionality of molecules?

(A) Ultraviolet (B) Visible (C) Infrared (D) Microwave
Ap Chemistry

12/13/17

if an organic compound has an empirical formula of C2H3O2

has an empirical formula of C2H3O2 and its molar mass is 118.1 g/mol what is the molecular formula of the compound? and the empirical formula of the compound if it is an organic compound.
Ap Chemistry Science Chemistry

12/11/17

How do I solve this light/energy problem?

In the investigation of the electronic absorption spectrum of a particular element, it is found that a photon having a wavelength  of 500nm provides just enough energy to promote an electron from... more
Ap Chemistry Science Chemistry

12/11/17

Can you help me with this word problem on heat?

Mrs. Smith is having a few friends over for dinner and making iced tea, but she finds that she is out of ice. She finds that she has five aluminum bars in the freezer and decides to use them to... more
Ap Chemistry Science Chemistry

12/11/17

KClO3(s) produces KCl and O2 when heated. 2.34L of O2 was collected over water at 9878mmHg at 65°C. What mass of KClO3 reacted?

How do I solve this AP Chemistry problem?
Ap Chemistry Science Chemistry

12/11/17

How do I calculate what mass of CO2 can be by mixing 2.34g of C2H5OH with 5.6L oxygen at 78°F

The reaction occurs at 900 mmHg and the formula for the reaction is: C2H5OH+O2===> CO2+H2O
Ap Chemistry Science Chemistry

12/11/17

Can you help me with this gas law problem?

What volume will 1.23g of CO2 occupy at 45°C and 678 mmHg?

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