197 Answered Questions for the topic AP physics

10/23/17

Can you help me with this thermochemistry problem?

If the internal energy of a thermodynamic system is increased by 300J while 75J of expansion work is done, how much heat was transferred and in which direction, to or from the system?

10/21/17

I am struggling with this problem about a magnesium reaction

Can you help me with this problem about a magnesium metal reaction?Magnesium metal is reacted with excess HI to produce hydrogen gas. The gas is collected over water. 45.82mL of the wet hydrogen... more

10/21/17

I am struggling with this problem on gas stochiometry

What volume in millilters of sulfur dioxide can be produced by the complete reaction of 3.82g of calcium sulfite with excess HCl(aq), when the final SO2 pressure is 827 torr at 44°C?      

10/21/17

Can you help me with this problem on the mond process?

The Mond process produces pure nickel via the thermal decomposition of Ni(CO)4.   The reaction is: Ni(CO)4==>Ni(s) + 4CO(g)   What volume of CO is formed from the complete decomposition of... more

10/20/17

Can you help me with this problem about a magnesium metal reaction?

Magnesium metal is reacted with excess HI to produce hydrogen gas. The gas is collected over water. 45.82mL of the wet hydrogen gas is collected at 30.0°C. The water level in the eudiometer is... more

10/20/17

Can you help me with this problem on total pressure?

A sample of He gas (3.0L) at 5.6atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25°C at constant temperature in a 9.0 L flask. How do I calculate the total pressure in the flask if... more

10/20/17

I am struggling with this AP chemistry problem on a chemical reaction between sufuric acid and zinc?

Zinc reacts with aqueous sulfuric acid to form hydrogen gas   Zn(s)+ H2SO4(aq)==> ZnSO4(aq)+H2(g)   In an experiment 201mL of wet H2 is collected over water at 27°C and 26.74 torr. How do I... more

10/20/17

Can you help me with problem on average molecular speed?

How do I calculate and arrange the average molcular speeds of Cl2, O2, and F2, and N2 in increasing order?

10/20/17

Can you help me with this rate of effusion problem?

How do I calculate which of these pairs of gases have the most nearly identical rates of effusion?   A. CO and CO2   B. CO and N2   C. NO2 and N2O4   D. N2O and NO2   E. N2 and O2  

10/20/17

Can you help me with this sodium hydride reaction problem?

Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas   NaH(s)+ H2O (l)=>NaOH(aq)+H2(g)   How do I calculate what mass will produce 982mL of gas at... more

10/20/17

How do I calculate the pressure in a 12.2L vessel that contains 2.34g CO2, 1.73g SO2, and 3.33g Ar at 42 degrees Celsius?

Can you please help me with this problem? Thanks

10/20/17

What volume of CO can be produced from the complete decomposition of 444g of Ni(CO)4?

The reaction is: Ni(CO)4= Ni(s)+ 4CO(g)

10/19/17

Can you help me with this problem on root square mean?

According to kinetic-molecular theory, in which of the following gases will the root square mean speed of the molecules be the highest at 200°C?   A. SF6   B. H2O   C. Cl2   D. HCl   E. None more

10/19/17

Can you help me with this AP Chemistry Stoichiometry problem?

What volume of sulfur dioxide can be produced by the complete reaction of 3.82g of calcium sulfite with excess HCl (aq) wheb the final SO2 pressure is 8.27 torr at 44°C

10/19/17

Which 1.0 M aqueous solution would produce the most ions?

Which 1.0 M aqueous solution would produce the most ions?     A. HF   B. Li2CO3   C. Al(NO3)3   D. KOH      

10/19/17

I am struggling with this problem on molarity

33.0 mL of aqueous 0.878M potassium oxide solution is mixed with a 25.0mL solution of 0.699M iron( III) nitrate, producing a precipitate.   How do I:   A. Write a balanced net equation for the... more

10/19/17

Can you help me with this problem about salts?

Consider five unlabled bottles of the following salts: AgCl, BaCl2, NaCl, CoCl2, and HCl. Identify the compound that can be distinguished by adding 1.0 M Na2SO4 to each of the samples. Please... more

10/19/17

Can you help me with this AP Chemistry problem on reactions and cations? Thanks.

An unknown solution is tested as follows: NaCl is added and no precipitate is formed K2SO4 is added and no precipitate is formed.   Which of these cations might be present in the solution:   A.... more

10/19/17

Can you please help me identify this unknown soloution?

An unknown solution is tested as follows:   NaCl is added and no precipitate is formed   K2SO4 is added and no precipitate is formed.   Identify the unknown substance.

10/19/17

In which compound does nitrogen have an oxidation number of +3?

A. NH3 B. NO3 C. NO2 D. N2O5

10/19/17

Question about Molarity. Please help me, Urgent.

How much water should be added to 10.0 mL of 6.00M HCl to prepare a 0.500M HCL solution?

10/15/17

Can you help me with this Grahm's Law AP Chemistry Problem?

The rate of effusion of a particular gas is 24.0 L/min. Under the same conditions, the rate of effusion of CH4 is 47.8 L/min. What is the molar mass of the unknown gas?

10/15/17

Consider two separate 1.0 L gaseous samples of H2 and O2. How can the samples have the same average velocity at STP?

Can you please help me with this problem?   Thanks

10/09/17

a student runs 30 meters west. then she turns 40 degrees toward the south and runs for 120 meters. find the resultant displacement.

include 3 significant figures and correct units please.

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