# Hi! I am trying to answer questions on a review packet and out of the 40 questions these six really – Assignment Help

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Hi! I am trying to answer questions on a review packet and out of the 40 questions these six really have me stumped. I would really appreciate some help. Four are multiple choice and only two require an explanation so I hope that makes it easier to work through them. Thank you so much for your help, it will help clarify a lot of my confusion :)1) During an experiment, the percent yield of calcium chloride from a reaction was 80.34%. Theoretically, the expected amount should have been 115 grams. What was the actual yield from this reaction?CaCO3 HCl → CaCl2 CO2 H2O A) 90.1 gramsB) 92.4 gramsC) 109.2 gramsD) 115.3 grams2) Based on the equation, how many grams of Br2 are required to react completely with 42.3 grams of AlCl3?2AlCl3 3Br2 → 2AlBr3 3Cl2A) 66.5 gramsB) 71.2 gramsC) 76.1 gramsD) 80.2 grams3) This question requires an explanation… I don’t even know where to start, please help!A 3.81-gram sample of NaHCO3 was completely decomposed in an experiment.2NaHCO3 → Na2CO3 H2CO3In this experiment, carbon dioxide and water vapors combine to form H2CO3. After decomposition, the Na2CO3 had a mass of 2.86 grams.A. Determine the mass of the H2CO3 produced.B. Calculate the percentage yield of H2CO3 for the reaction. Show your work or describe the calculation process in detail.4) A 4.5-liter sample of a gas has 0.80 mole of the gas. If 0.35 mole of the gas is added, what is the final volume of the gas? Temperature and pressure remain constant.5) What is the mass of a sample of NH3 containing 3.80 × 1024 molecules of NH3? (5 points)A) 74.8 gramsB) 89.4 gramsC) 101 gramsD) 107 grams6) Describe the type of force which exists between particles in an ideal gas. Explain why this type of force exists between the particles.

## Extend your thinking: The Gizmo enables you to examine ionsShow ionClA. , or atoms that have gained or lost electrons.

Extend your thinking: The Gizmo enables you to examine ionsShow ionClA. , or atoms that have gained or lost electrons. Select Na and turn on . Compare the radius of the neutral atom to that of the ion. Repeat with . Then look at other ions. See if you can find a pattern.Why do you think the Na ion is smaller than a neutral Na atom?B.Why do you think the Cl- ion is larger than a neutral Cl atom? can u help me on this???

## . Make a graph of ln kusing excel and can you share the link of the excel. as a function

. Make a graph of ln kusing excel and can you share the link of the excel. as a function of 1/T using the data from mixtures with varied temperatures (which all had the same reagent composition). use the scatter mode and then add a linear regression trend line- be sure to and the R2 value on the graph

## Question: Taking the pKa for acetic acid from the pKa ionization constant for weak acids (4.76), calculate how much solid

Question: Taking the pKa for acetic acid from the pKa ionization constant for weak acids (4.76), calculate how much solid sodium acetate ( in moles) must be added to a liter of 0.1 N acetic acid to produce a buffer solution of pH 4.50 (ignore the volume change).

## #4: Phenobarbital is an anticonvulsant, sedative, and hypnotic drug. A 0.3 M aqueous solution of Phenobarbital was prepared. (a)

Chemistry Assignment Writing ServiceQuestion #4: Phenobarbital is an anticonvulsant, sedative, and hypnotic drug. A 0.3 M aqueous solution of Phenobarbital was prepared. (a) Calculate the pH of the solution at room temperature. The molecular weight of Phenobarbital is 232.24 g/mole, and its pKa is 7.3. Phenobarbital is a weak acid. (b) If 0.02 mole of NaOH was added to 1 L of the above solution. Now the solution is a buffer system composed of 0.28 M Phenobarbital and 0.02M Sodium Phenobarbital. What is the pH of the prepared buffer?(c) Calculate the buffer capacity of the solution in b. (d) Calculate the % ionized of Phenobarbital in b

## Insects called “water striders” have the unique ability to skid across the surface of water without sinking. Using your knowledge

Insects called “water striders” have the unique ability to skid across the surface of water without sinking. Using your knowledge on properties of matter and intermolecular forces to explain why this is insect is able to achieve this feat. Make sure to use scientific reasoning and vocabulary from the unit.

## 1.) How many moles of PCl5 can be produced from 25.0 g of P4 (and excess Cl2)? 2.) How many

1.) How many moles of PCl5 can be produced from 25.0 g of P4 (and excess Cl2)? 2.) How many moles of PCl5 can be produced from 60.0 g of Cl2 (and excess P4)?3.) How many grams of CH3OH can be made from 36.0 g of CO if it all reacts?4.) If 28.4 g of CH3OH is recovered when the amounts in part B are used, what is the percent yield?

## A sample of pure water was spiked with 0.555 ng/mL silver ion. Ten replicate determinations of the spiked water sample

A sample of pure water was spiked with 0.555 ng/mL silver ion. Ten replicate determinations of the spiked water sample gave 0.565, 0.545, 0.522, 0.508, 0.549, 0.529, 0.533, 0.537, 0.515, and 0.500 ng/mL silver ion. Determine the mean percent recovery of the spike and the detection limit of the analytical method used for the silver ion determination.mean percent recoverydetection limit in ng/mL

## A cylinder contains 10.9 cL of water. An object with mass of 7.3 g is added and the water level

A cylinder contains 10.9 cL of water. An object with mass of 7.3 g is added and the water level rises to 13.0 cL. Find d of the object in g/mL. A cylinder contains 45.1 mL of water. A piece of iron with 55.85 g is added and the water level rises to 53.0 mL. Find d of iron.

## The fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium

The fluoride rinse in dental offices usually contains sodium fluoride. Sodium fluoride can be prepared from the reaction between sodium metal and fluorine gas. Which properly represents the balanced chemical equation for this reaction? -Na(s) F2(g) → NaF2(s) -Na(s) F(g) → NaF(s) -7Na(s) F(g) → Na7F(s) -2Na(s) F2(g) → 2Na2F(s) -2Na(s) F2(g) → 2NaF(s)Why is it important to understand this equation? What could happen if this is incorrect? What Chemical equation is this particular equation?( Synthesis, decomposition, single displacement, double displacement, combustion)

## JJ Thompson’s model was based on the discovery of the cathode ray, what we now refer to as electrons. A

JJ Thompson’s model was based on the discovery of the cathode ray, what we now refer to as electrons. A typical human hair weighs approximately 0.5 mg. An electron weighs 9.11 x 10-31 kg. How many electrons would it take to have a mass equal to a human hair? b. A proton has a radius of ~1 fm, and an atom has a radius of ~1 Å (1 Å = 1 ´ 10-10 m). Calculate the ratio of the radius of a proton to the radius of the atom. c. Millikan’s experiment (not discussed above) was related to the charge of an electron, which his team determined to be approximately 1.6 ´ 10-19 C. A standard 60 W light bulb has a current (charge per time) of 0.5 C per second. How many electrons must flow per second to generate 60 W?

## A pot of water at room temperature is placed on the burner of a gas stove and heated until 15%

A pot of water at room temperature is placed on the burner of a gas stove and heated until 15% of the water has evaporated due to boiling. (a) Copy Figure 3, and complete it to show a temperature-time graph for the heating (including boiling) of the water. (b) Describe the changes that take place in the kinetic and potential energy of the water molecules as the water is heated, and then when it boils. (c) Describe the changes that take place in the kinetic and potential energy of the gas molecules as they undergo combustion in the stove. (d) Use the law of conservation of energy to explain the graph that you have drawn.

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