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HCOOH (aq) + H2O (l) <---> H3O+(aq) + HCOO-(aq)
Ka = 1.8*10-4
Methanoic acid ionizes according to the equilibrium equation above. Write the expression for the equilibrium constant, Ka, for the reaction.
What is "Ka = [H3O+][HCOO-]/[HCOOH]"
A sample of gas occupies a volume of 2.50 dm3 at a pressure of 101kPa. If the gas is compressed at a constant temperature to a volume of 1.80 dm3, what is the new pressure value? What is the name of gas law used?
What is "140 kPa
Boyle's Law"
In a laboratory experiment, 50.0 g of water is heated from 25.0oC to 37.5oC using an exothermic reaction. Calculate the enthalpy change of the system in kJ, assuming all heat goes into the water.
What is <Delta H => "-2.61 kJ"
Write the full electron configuration for the Fe+3 ion.
What is "1s22s22p63s23p63d5"
Identify the type of reaction and the product when bromomethane is reacted with aqueous sodium hydroxide under reflux conditions.
What is "nucleophilic substitution AND methanol"
HCOOH (aq) + H2O (l) <---> H3O+(aq) + HCOO-(aq)
Ka = 1.8*10-4
Methanoic acid ionizes according to the equilibrium equation above. Calculate the pH of a 0.25M solution of HCOOH.
What is "2.17"
A sealed gas container has a pressure of 120 kPa at 280 K. If the temperature is raised to 350 K, what is the new pressure, assuming the volume remains constant? Which gas law did you use?
What is "150 kPa
Gay-Lussac's Law"
Calculate the enthalpy change for the combustion of ethanol.
C2H5OH (l) + 3O2 (g) ---> 2CO2 (g) + 3H2O (l)
C2H5OH (l) = -278 kJ mol-1
CO2 (g) = -394 kJ mol-1
H2O (l) = -286 kJ mol-1
What is "-1368 kJ mol-1"
The successive ionization energies of an element are shown below in kJ mol -1.
800 --> 2427 --> 3660 --> 25000 --> 32800
Determine the group of the element
what is "Group 13 OR 3"
How many structural isomers are possible for butane? What are their names?
What is "5 AND but-1-ene AND but-2-ene AND 2-methylpropene AND cyclobutane AND methylcyclopropane"
In an aqueous solution, the compound H2NNH2 reacts according to the equation above. A 50.0 mL sample of 0.25 M H2NNH2 (aq) is combined with a 50.0 mL sample of 0.25 M HCOOH (aq).
1. Write the balanced equation for the reaction between H2NNH2 and HCOOH.
2. Is the resulting solution acidic, basic, or neutral? Justify your answer.
What is "H2NNH2 + HCOOH ---> H2NNH3+ + HCOO-
Acidic because the Ka of H2NNH3+ is greater than HCOO-"
A gas occupies 3.00 dm3 at 300 K. What will be its volume at 360 K, assuming constant pressure? Which gas law did you use?
What is "3.60 dm3
Charles's Law"
For a reaction at 298 K, the enthalpy change is -125 kJ mol-1 and the entropy change is -200 J mol-1 K-1. Determine whether the reaction is spontaneous at 298 K. Justify your answer.
What is <delta G = -65.4 kJ mol-1> "Yes it is because the sign is negative."
Why is the first ionization energy of magnesium higher than that of sodium?
What is "more protons AND a higher nuclear charge"
An unknown organic compound, X, has a strong broad absorption around 3300 cm-1 and no peak near 1700 cm-1. Which functional group is most likely present?
What is "<an> alcohol"
When a catalyst is added to a solution of HCOOH (aq), the reaction represented by the following equation occurs.
HCOOH (aq) ---> CO2 (g) + H2 (g)
Is this a redox reaction? Justify your answer.
What is "Yes because the oxidation number of hydrogen change from +1 in HCOOH to zero in H2."
Calculate the number of moles of gas in a 5.00 dm3 container at 298 K and 100 kPa. Which gas law did you use?
What is "0.202 mol
Ideal Gas Law"
Estimate the enthalpy change for this reaction using average bond enthalpies.
H2 (g) + Cl2 (g) ---> 2HCl (g)
H-H = 436 kJ mol-1
Cl-Cl = 242 kJ mol-1
H-Cl = 431 kJ mol-1
What is "-184 kJ mol-1"
What is the trend in atomic radius across Period 3 from sodium to chlorine?
What is "protons increase AND nuclear charge increases"
What is the product when butan-2-ol is heated under reflux with acidified potassium dichromate, and what is the type of reaction?
What is "butan-2-one AND oxidation"
What is the function of antacids?
What is "to neutralize excess stomach acid"
What is a common side effect of opioids?
What is "respiratory issues"
Also accept other answers like "nausea OR breathing issues"
Which functional group is essential in the structure of aspirin for its anti-inflammatory properties?
What is "carboxylic acids"
Which class of drugs is used to treat bacterial infections by interfering with cell wall synthesis?
What is "penicillin"
What is the name of the process in which inactive forms of drugs become active inside the body?
What is "prodrug-activation"