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465 Answered Questions for the topic AP chemistry

Ap Chemistry Science Chemistry

12/07/17

How do I solve this Chemistry problem?

How many mL of 2.50M HNO3 contain enough nitric acid to dissolve an old copper penny with a mass of 3.94 grams?   The equation for this reaction is:   3Cu (s)+ 8HNO3 (aq)===> 3Cu (NO3)2... more
Ap Chemistry Science Chemistry

12/03/17

How do I use the localized electron model to describe the bonding in the following compounds?

H2O CCl4 H2CO C2H2
Ap Chemistry Math Science

11/27/17

Can you help me with this exothermic lattice energy problem?

How do I determine which of the following pairs of ionic substances has the most exothermic lattice energy?   A. LiF, CsF  B. NaBr, NaI  C. BaCl2, BaO  D. Na2SO4, CaSO4  E. KF, K2O  F. Li2O,... more
Ap Chemistry Math Science

11/25/17

Can you help me with this Chemical Bonding problem?

How do I figure out which noble has had the same electron configuration as each of the ions in the following compounds?   A. Cesium sulfide  B. Strontium fluoride  C. Calcium nitride  D.... more
Ap Chemistry Math Science

11/17/17

How do I solve this Chemical Bonding Problem?

Predict the type of bond (ionic, covalent,or polar covalent) one would expect to form between the following pairs of elements.   A. Rb and Cl    B. S and S   C. C and F    D.  Ba and... more
Ap Chemistry Math Science

11/16/17

What steps do I need to use to solve this atomic structure problem?

Which element is being referred to? Explain your answer.   E1  577.4 kJ/mol E2   1,816 kJ/mol E3.   2,744 kJ/mol E4.   11,580 kJ/mol E5.    15,048 kJ/mol   Answer Choices:   A) Na B)... more
Ap Chemistry Math Science

11/10/17

Can you me with this molarity problem?

What volume of NaOH is needed to make 50mL of a 1M solution?
Ap Chemistry Math Science

11/10/17

Atomic Structure and periocity concept question

Why are the changes in election affinity as one goes down a group in the periodic table not nearly as large as variations in ionization energy.    My book does not explain this concept very clearly. more
Ap Chemistry Math Science

11/10/17

I am having trouble understanding this AP Chemistry Concept

Diagonal relationships in the periodic table  exist as well as the vertical relationships. For example, Be and Al are similar in some of their properties as are B and Si. Rationalize why these... more
Ap Chemistry Math Science

11/09/17

Can you help me with this atomic structure problem?

How many orbitals can have the designation 5p, 3dz^2, 4d, n=5, n=4?
Ap Chemistry Science Chemistry

11/06/17

Find Kc for the reaction

The following reaction was performed in a sealed vessel at 723 ∘C :H2(g)+I2(g)⇌2HI(g)Initially, only H2 and I2 were present at concentrations of [H2]=3.10M and [I2]=2.20M. The equilibrium... more
Ap Chemistry Math Science

11/05/17

Can you help me with this atomic structure and periocity problem?

Calculate the longest and shortest wavelengths of light emitted by electrons in the hydrogen atom that begin in the n=6 state and then fall to states with smaller values of n.
Ap Chemistry Math Science

11/04/17

Can you help me with this AP Chemistry problem?

20. Calculate ∆H for the reaction of sulfur dioxide with oxygen. 2SO2 (g) + O2 (g) → 2SO3 (g) (∆Hf 0 SO2 (g) = –296.8 kJ/mol; ∆Hf 0 SO3 (g) = –395.7 kJ/mol) a. –98.9 kJ c. 197.8 kJ b. –197.8 kJ d.... more
Ap Chemistry Math Science

11/04/17

How do I solve this enthalpy problem involving the formation of rust?

∆Hf 0 for the formation of rust (Fe2O3 ) is –826 kJ/mol. How much energy is involved in the formation of 5 grams of rust? a. 25.9 kJ c. 66 kJ b. 25.9 J d. 66 J
Ap Chemistry Math Science

11/04/17

How do I solve a heat of reaction problem similar to this one?

18. For which one of the following reactions is the heat of the reaction also a heat of formation of the product?a) N2(g) + 3H2(g) ----> 2NH3(g)b) (1/2)N2(g) + O2(g) ----> NO2(g)c) 6C(s) +... more
Ap Chemistry Math Science

11/04/17

How do I solve a heat of formation similar to this one?

17. Given the following heats of formation: SO2(g) = -297 kJ/mole, SO3(g) = -396 kJ/moledetermine the heat of reaction (in kJ) for 2SO2(g) + O2(g) ----> 2SO3(g)a) -99 c) 99b) -198 d) 198
Ap Chemistry Math Science

11/04/17

How do I solve an AP Chemistry problem similar to this one?

11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)... more
Ap Chemistry Math Science

11/04/17

How do I solve a heat of formation problem like this?

11. 3N2O(g) + 2NH3(g) -----> 4N2(g) + 3H2O(g) Enthalpy change = -879.6 kJWhat is the heat of formation for N2O in kJ/mole (heats of formation: NH3 = -45.9 kJ/mole and H2O = -241.8 kJ/mole)?a)... more
Ap Chemistry Math Science

11/04/17

How do I solve change in enthalpy problems like this?

3. 2Al(s) + 3O2(g) -----> 2Al2O3(s) enthalpy change is -3351 kJWhat would be the enthalpy change (in kJ) for the formation of 65.0 g of Al2O3(s)?a) -251000b) -126000c) -2464d) -1232
Ap Chemistry Math Science

11/03/17

How do I solve this problem on a reaction between Ba (OH)2 and H2SO4?

30 mL of 0.10M Ba (OH)2 (aq) is added to 30 mL of 0.10 M H2SO4 and the solution is stirred quickly. The rise is temperate T 1 is measured. The experiment is repeated using 90 mL of each solution... more
Ap Chemistry Math Science

11/03/17

How do I solve this problem on a reaction between a NH3 and HCl?

When 0.157 lol NH3 is reacted with excess HCl, 6.91 kJ of energy is released as heat. How do I calculate the energy change per mole of NH3?
Ap Chemistry Math Science

11/03/17

How do I solve this AP Chemistry problem?

1/2O2 (g)+ Hg (l)====> HgO (s) ΔH= -90.8 kJ. How do I calculate how much heat is released when 42.5g of By is reacted with oxygen
Ap Chemistry Math Science

11/03/17

How do I solve this heat of formation problem?

3Al (s)+3O2 (g)===> 2AlO3 (s) ΔH= -3351kJ How do I calculate the change in enthalpy in kJ for the formation of 65.0 g of Al2O3?
Ap Chemistry Math Science

11/03/17

How do I solve this enthalpy of formation problem?

The heats of combustion of C, H2, and CH4 at 298K and 1 atm are respectively -393 kJ/mol, -286 kJ/mol, and -892 kJ/lol. How do I calculate the enthalpy of formation for CH4 using the given... more
Ap Chemistry Math Science

11/03/17

Can you help me with this phase change thermochemistry problem?

How do I calculate how much heat energy is required to hear a 150g sample of ice initially At -14°C to 30°C?.   I know that I am supposed to use the equation q=mcΔT at some point, but I am not... more

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