General Questions and Answers

A sample of gas with an initial volume of 29.3 L at a pressure of 735 mm Hg and a temperature of 309 K is compressed to a volume of 15.6 L and warmed to a temperature of 378 K. What is the final pressure of the gas? Pfinal=

14. What is the correct order of the given terms of size of solute particles from smallest particles to largest particles? A. Colloid, solution, suspension B. Solution, colloid, suspension C. Suspension, colloid, solution D. Solution, suspension, colloid

Carbon occurs in two forms, graphite and diamond. The enthalpy of the combustion of graphite is -393.5 kJ/mol, and that of diamond is -395.4 kJ/mol: C (graphite) + O₂(g) → CO₂ (g) ΔH=-393.5 kJ C (diamond) + O₂(g) → CO₂ (g) ΔH=-395.4 kJ Calculate ΔH for the conversion of graphite to diamond: C (graphite) → C (diamond) ΔH =?

Which statement concerning solution concentration is FALSE? An unsaturated solution contains less than the maximum amount of solute that can be dissolved in the solvent. The molarity of a solution is the number of moles of solute present in one liter of the solution. A saturated solution contains more than 100 g of dissolved solute. The concentration of a saturated solution is equal to the solubility of the solute. A solution can be made less concentrated by adding additional solvent.

A student is conducting a titration lab as part of their Grade 12 Chemistry course. The procedure asks them to titrate 35.00 mL of a 0.0.64 mol/L hydrobromous acid, HBrO(aq), a weak acid, with 0.150 mol/L of strong potassium hydroxide solution, KOH(aq). They observe the equivalence point is reached when 15.00 mL of the base has been added. The student has already done some calculations and found that 0.00224 mol of acid and base were used to make 0.00224 mol of the basic salt. What should the student calculate as the pH at the equivalence point, given Kb = 3.6 x 10^-6? Include any tables, formulas, and balanced reactions used. The acid-base equation has been provided. [HINT: Start by finding the concentration of salt!] *SHOW YOUR WORK! HBrO (aq) + KOH(aq) -> H₂O(l) + KBrO (aq)

Study this chemical reaction: Ca+I₂ → Cal₂ Then, write balanced half-reactions describing the oxidation and reduction that happen in this reaction. oxidation: reduction:

Wild almonds taste bitter (and are dangerous to eat!) because they contain hydrocyanic acid, HCN (aq). Answer the following about HCN: a) Write the reaction of hydrocyanic acid and water. (2 marks) b) Write the Ka expression. (1 mark)

a. A block of sodium that has the measurements 3.00 cm × 5.00 cm x 5.00 cm has a mass of 75.5 g. Calculate the density of sodium. b. Compare your calculated density with the value in the properties table for Group 1 elements. Calculate the percentage error for your density determination.

If 5.39 g of sodium carbonate is recovered from the decomposition of 1.55 g of sodium bicarbonate, what is the percent yield of the reaction? (Note: I messed up on this problem and the percent yield will be unrealistically large. You can still solve it but will get a number much larger than I intended.) 2 NaHCO3(s)→ Na2CO3(s) + CO2(g) + H₂O(l)

Read this sentence and answer the question that follows. The policemen arrived at the crime scene anticipating some trails to track the murderer. What does anticipating mean in this context? Expecting Bitter Surprised

Silver sulfate is precipitated from solution according to the following reaction 2 AgNO3 (aq) + Na2SO4 (aq)-> Ag2SO4 (s) + 2 NaNO3(aq) If 3.80 moles of AgNO3 and 3.05 moles of Na2SO4 are present initially, how many moles of excess reactant will remain after precipitation is complete? Write your answer to 2 decimal places.

What is one reason to fill out the Free Application for Federal Student Aid (FAFSA), even if you do not expect aid? A. You could be offered financial aid you didn't know was available. B. You are required to fill out the FAFSA for admission to all schools. C. You cannot graduate unless you fill out the FAFSA. D. You can better qualify for merit-based financial aid.

Find the meaning of the underlined word from the context of the sentence. Christy has taken a perilous job. I'm not sure if it is worth risking her life. Traveling Creative Dangerous

Vinegar is a solution of acetic acid in water. If a 325 mL bottle of distilled vinegar contains 24.1 mL of acetic acid, what is the volume percent (v/v) of the solution? Express your answer to three significant figures.

Snis a different compound than SnO₂. What is the difference regarding the cation? The oxygen in Snhas a higher oxidation state than the oxgyen in SnO₂ The oxygen in Snhas a lower oxidation state than the oxygen in SnO₂ The tin in Snhas a higher oxidation state than the tin in SnO₂ The tin in Snhas a lower oxidation state than the tin in SnO₂

What is the overall balanced equation for the precipitation reaction occurring between silver nitrate and calcium bromide? 2AgNO3(aq) + CaBr₂ (aq)→2AgBr(aq) + Ca(NO3)2 (aq) AgNO3(aq) + CaBr₂ (aq) →AgBr(s) + Ca(NO3)2 (aq) 2AgNO3(aq) + CaBr2 (aq)→2AgBr(s) + Ca(NO3)2 (aq) 2AgNO3 + CaBr2-2AgBr + Ca(NO3)2

Which two sentences describe characteristics of a partnership? The owners are free from personal liability. The owners pool their resources to raise capital. The owners in a partnership are called members. The business benefits because owners can share responsibilities.

Predict the products for the following precipitation reaction: NiCl2 (aq) + (NH4)2S(aq) → NiS (s) + 2NH₂Cl(aq) NiS (s) + 2NH4Cl(s) NiS (aq) + 2NH4Cl(aq) NiS (s) + NH4Cl(aq)

While I agreed with his view that some of the obsolete rules of our historic school did not apply to the students today, I thought he needed to be more cooperative. What does obsolete mean in this context? Significant Outdated Intricate

37.6 mL of aqueous 0.255 M Pb(NO3)2 is mixed with 34.2 mL of 0.415 M NaCl. The equation for the precipitate reaction is: Pb(NO3)2 (aq) + 2 NaCl (aq) -> PbCl2 (s) + 2 NaNO3 (aq) How many moles of PbCl2 are formed?

Which answer correctly explains the idiom, "It is raining cats and dogs?" It is raining very hard. Cats and dogs are falling from the sky. People are throwing stuffed animals at each other.

A jet airplane reaches 643. km/h on a certain flight. What distance does it cover in 3.0 min? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols.

9. If 45 grams of triamcinolone is added to 100 grams of Aquaphillic ointment, what is the percent strength?

Ammonia and gaseous hydrogen chloride combine to form ammonium chloride. NH3(g) + HCl(g) → NH4Cl(s) If 5.14 L of NH3(g) at 22.0 °C and 0.990 atm is combined with 4.08 L of HCl(g) at 37.0 °C and 2.69 atm, what mass of NH4Cl(s) will be produced? Mass= Which gas is the limiting reactant? NH3 HCI

The solubility in acetone of organic compound O is measured and found to be 71.5 at 10. °C. Calculate the volume of a saturated solution of O in acetone that would contain 300. mg of O at this temperature. Be sure your answer has the correct unit symbol and 3 significant digits.

Four liquids are described in the table below. Use the second column of the table to explain the order of their freezing points, and the third column to explain the order of their boiling points. For example, select '1' in the second column next to the liquid with the lowest freezing point. Select '2' in the second column next to the liquid with the next higher freezing point, and so on. In the third column, select '1' next to the liquid with the lowest boiling point, '2' next to the liquid with the next higher boiling point, and so on. Note: the density of water is 1.00 g/mL. 8.7 g of sucrose (C12H22011) dissolved in 100. mL of water 8.7 g of propylene glycol (C3H8O₂) dissolved in 100. mL of water 8.7 g of potassium chloride (KCI) dissolved in 100. mL of water 100. mL of pure water

What is true about the motions of electrons? Select the correct answer below: They display particle-like behavior. They display wave-like behavior. They display both particle-like and wave-like behavior. They display neither particle-like nor wave-like behavior.

Which of the following properties describes colloids? Colloids contain small solute particles, are homogenous mixtures, and can be filtered. Colloids contain particles that are large molecules, are homogenous mixtures, and cannot be filtered. Colloids contain particles that can be seen with the naked eye, are heterogeneous mixtures, and can be filtered. Colloids contain small solute particles, are homogenous mixtures, and cannot be filtered.

A certain substance X has a normal boiling point of 121.7 °C and a molal boiling point elevation constant K = 0.52 °C-kg-mol. A solution is prepared by dissolving some urea ((NH,),CO) in 200. g of X. This solution boils at 122.1 °C. Calculate the mass of urea that was dissolved. Round your answer to 1 significant digit.

How does thermal energy move between objects? It moves from objects of lower mass to objects with higher mass. It moves from objects of higher mass to objects with lower mass. It moves from objects of lower temperature to objects with higher temperature. It moves from objects of higher temperature to objects

What is the percent-by-mass, % (m/m), concentration of Na2SO4 in a solution made by dissolving 39.5 g of Na2SO4 in enough water to give 96.0 g of total solution? Type answer:

First, launch the video below. You will be asked to use your knowledge of chemistry to predict the outcome of a demonstration. Then, close the video window and answer the questions at right. You can watch the video again at any point to review. Water and toluene are not miscible. Which of the following is most likely the formula of toluene? CH3COOH C6H5 CH3 CH3OH C6H12O6

Regular treatment with low dose aspirin is used to help prevent cardiovascular disease. How many aspirin molecules are in 200. mg of aspirin? The molecular formula for aspirin is C9H8 O4.

Shirley knows the amount of a compound in grams. Choose the values Shirley needs to use in her calculation to find the number of molecules in the given sample of her compound. volume of the compound Avogadro's number density of the compound molar mass of the compound

In order to dilute a solution, the volume which causes the concentration to decreases; decrease increases; decrease increases; increase decreases; increase

In which of the following options is the comma used correctly? Elisa one of the partners in my company, decided to start her own business. Elisa, one of the partners in my company decided to start her own business. Elisa, one of the partners in my company, decided to start her own business.

What is the molarity of the solution prepared by diluting 20.1 mL of 2.10 M AgNO3 to the final volume 98.5 mL? Calculate your final answer to 2 decimal places. Type answer:

How many grams of HNO3 are in 3.405 x 1022 molecules of HNO₂? Show the conversions required to solve this problem and calculate the grams of HNO3. 3.405 x 1022 molecules HNO3 ×

How many milliliters of a 0.624 M KOH solution would be needed to provide 5.58 g of KOH to a chemical reaction?

A 0.0965 g sample of aluminum metal reacts with sulfuric acid to give 129 mL of hydrogen gas at 26 °C and an atmospheric pressure of 766 mm Hg. The hydrogen gas is collected over water. a) Write a balanced chemical equation for the reaction between solid aluminum metal and aqueous hydrochloric acid.

How many grams of AIPO4 are in 1.606 x 10^22 molecules of AIPO? Show the conversions required to solve this problem and calculate the grams of AIPO4.

How many grams of glucose (C6H₁206) are there in 911.47 mL of a 19.20 % (m/v) glucose-water solution?

The reaction H3 AsO3 + 12 + H₂O →→→ H³AsO, +21¯+2H+ is one of a pair of reactions in an experiment called the iodine clock reaction, an example of chemical chaos. Which of the following statements concerning this reaction is true? 1. As is being oxidized from +6 to +8. 2. As is being reduced from +8 to +6. 3. As is being oxidized from +3 to +5. 4. As is being reduced from +5 to +3.

In the redox conversion of SO3 to SO-, S is? and its oxidation number goes from ? to ? 1, oxidized; 2 to 6 oxidized; 3 to -3 3, reduced; 6 to 3 4, oxidized; 6 to 3 5, oxidized; 6 to 2 6, reduced: 6 to 1 7, oxidized; 6 to 1 8, reduced; 6 to 2 9, reduced; 2 to 6 10, reduced: 3 to 3

Write the net ionic equation for the precipitation reaction that occurs when aqueous solutions of barium sulfide and aluminum nitrate are combined. Be sure to specify states such as (aq) or (s). If a box is not needed leave it blank.

How many molecules of NaClO4 are in 3.061g NaClO4? Show the conversions required to solve this problem and calculate the molecules of NaCIO4.

(a) When aqueous solutions of AgNO3 and Znl₂ are mixed, does a precipitate form? (b) Write a balanced equation for the precipitation reaction that occurs when aqueous solutions of calcium iodide and potassium carbonate are combined. Be sure to include states such as (s) or (aq).

How many mL of isopropyl alcohol is present in a 48% solution of isopropyl alcohol by volume if there are 170 mL of total solution? Show all work and remember units are part of your answer.

Balance the given chemical equations. Use the lowest whole-number coefficients. equation 1: N₂ + O₂ → NO equation 2: TiCl4 + H₂O → TiO₂ + HCl equation 3: CH4+O2 → CO2 + H2O equation 4: C2H6 +O2 → CO2 + H2O

Which of the options contains a sentence that uses the apostrophe correctly? What did Megan mean by "Carls not going?" What did Megan mean by, "Carl's not going"? What did Megan mean by, "Carls not going"?