Chemistry Answers

water breaks down to produce hydrogen gas and oxygen gas

When you add a small amount of solute into the solvent in your set up 2 , what happen?

Answer the following questions.

1. (a) The formula of six compounds are given below.

C3H8, CH3CH2OH, CH3-O-CH2-CH3, HCOOH, CH3COOH

(i) Name the type of intermolecular forces present in the compounds.

(ii) Arrange these compounds in the order of increasing boiling point. explain your answer.

(i) Explain the polarity of the following simple covalent molecules: H2O, CO2, and SO2.

(ii) Which is the most polar molecule amo them? Explain.

To precipitate all the sulfate ions from 22.0 mL of 0.150 molarity aluminum sulfate as barium sulfate, how many mL of 0.250 molarity3. barium nitrate are required? (8 points)

____Ba(NO3)2(aq)+____Al2(SO4)3(aq)→______BaSO4(s)+____Al(NO3)3(aq)

To neutralize 15.8 mL of 0.687 molarity sodium hydroxide, how much 0.376 molarity HCl is needed? (5 points)

____HCl(aq)+____NaOH(aq)→____NaCl(aq)+____H(OH)(l)

Glucose is a natural sugar that occurs in abundance. What is the mass percent of a solution formed from 148 g of glucose and 698 g of water? (5 points)

What is the mass percent sucrose in a solution made by combining 365 g of a 8.90 percent sucrose by mass aqueous solution with 145 g of an 6.80 percent sucrose by mass aqueous solution? (5 points)

When 200 mL of 0.700 molarity silver nitrate is introduced to 150 mL of 0.500 molarity potassium chromate, how many grams of silver chromate will precipitate? (12 points)

____ AgNO3(aq) + ____K2CrO4(aq) → ____Ag2CrO4(s)+ ____KNO3(aq)

Calculate ∆H for the reaction 2C(s) + H2(g) → C2H2(g) using the following data:

H_2(g) +1/2 O_(2(g))→H_2 O_((l)) ∆H=-286 kJ

C_((s))+O_(2(g))→〖CO〗_(2(g)) ∆H=-394 kJ

C_2 H_2(g) +5/2 O_(2(g))→2〖CO〗_(2(g))+H_2 O_((l)) ∆H=-1 300 kJ

Calculate the change in the internal energy of a piston expanding against a pressure of 0.75 atm 10.3 L to 22.4 L. In the process, 1 030 J of heat is absorbed.

Consider a 10.0-g CO2 as an ideal gas, expanding isothermally and reversibly from a volume of 4 L to 12 L at 303 K. What is the work done by CO2? Calculate q and ∆E.

Samples of aluminum and of iron, both 1 kg in mass, absorb 9.5 kJ. Which substance would yield a larger change in temperature? Consider the specific heat capacities of aluminum (0.89 J/g-K) and iron (0.45 J/g-K).

Calculate the amount of heat released by a given reaction, causing the temperature of 500 mL water (density = 1 g/mL) to increase by 278.35 K (5.2°C)

How many moles does 56.7g of SrlO contain? (SrlO molar mass equals 230.5 g/mole)

𝒄𝒂𝒍𝒄𝒖𝒍𝒂𝒕𝒆 𝒕𝒉𝒆 𝒎𝒂𝒔𝒔 𝒐𝒇 𝒔𝒐𝒅𝒊𝒖𝒎 2 𝒄𝒉𝒍𝒐𝒓𝒊𝒅𝒆 𝒏𝒆𝒆𝒅𝒆𝒅 𝒊𝒇 𝒂 𝒔𝒐𝒍𝒖𝒕𝒊𝒐𝒏 𝒄𝒐𝒏𝒕𝒂𝒊𝒏𝒊𝒏𝒈 2 𝒈𝒓𝒂𝒎 𝒐𝒇 𝑯𝒈(no2)2 was added to sodium 2 chloride solution