Objective Questions

Questions (1872)

#	Question	Topic	Actions
301	Which of the following is a property of halogens?	CHM 101 Past Questions	View
302	How many valence electrons do atoms in Group 16 have?	CHM 101 Past Questions	View
303	Calculate the value of ΔU in joules for a system that loses 50 J of heat and ha…	CHM 101 Past Questions	View
304	As you move down a group in the periodic table, the atomic radius generally:	CHM 101 Past Questions	View
305	The theory that describes the behavior of matter at the atomic and subatomic le…	CHM 101 Past Questions	View
306	Water can be disinfected without adding chemicals by using:	CHM 101 Past Questions	View
307	In the modern periodic table, the horizontal rows are called:	CHM 101 Past Questions	View
308	Elements located along the stair-step line between metals and nonmetals are kno…	CHM 101 Past Questions	View
309	A student measures a mass as 2.456 g and a volume as 1.2 mL. What is the densit…	CHM 101 Past Questions	View
310	The difference between the experimental value and the accepted value is known a…	CHM 101 Past Questions	View
311	If a set of data points are very close to each other but far from the true valu…	CHM 101 Past Questions	View
312	The value of (8.314 × 310) / 96485 should be reported with how many significant…	CHM 101 Past Questions	View
313	The relative atomic mass of oxygen is 15.999. This is an average based on the a…	CHM 101 Past Questions	View
314	Calculate the number of hydrogen atoms in 1.00 mol of water (H₂O).	CHM 101 Past Questions	View
315	A compound is found to contain 85.7% carbon and 14.3% hydrogen by mass. Its mol…	CHM 101 Past Questions	View
316	The percentage by mass of oxygen in KMnO₄ is: (K=39, Mn=55, O=16)	CHM 101 Past Questions	View
317	A 0.500 g sample of a hydrocarbon is combusted to produce 1.500 g CO₂ and 0.767…	CHM 101 Past Questions	View
318	Balance the following chemical equation: ?Al + ?H₂SO₄ → ?Al₂(SO₄)₃ + ?H₂. The c…	CHM 101 Past Questions	View
319	When the equation C₂H₆ + O₂ → CO₂ + H₂O is balanced with the smallest whole num…	CHM 101 Past Questions	View
320	In the reaction: 2Na + Cl₂ → 2NaCl, if 2.0 mol of Na and 2.0 mol of Cl₂ are rea…	CHM 101 Past Questions	View
321	What mass of CaO is produced from the decomposition of 50.0 g of CaCO₃? CaCO₃ →…	CHM 101 Past Questions	View
322	Which element is oxidized in the reaction: MnO₂ + 4HCl → MnCl₂ + Cl₂ + 2H₂O?	CHM 101 Past Questions	View
323	What is the coefficient for H₂O when the equation Al + OH⁻ + H₂O → Al(OH)₄⁻ + H…	CHM 101 Past Questions	View
324	How is relative error calculated?	Errors and Stoichiometry	View
325	A metal cylinder has a mass of 55.85 g and a volume of 7.2 mL. What is its dens…	CHM 101 Past Questions	View
326	Which statement about oxidation and reduction is correct?	CHM 101 Past Questions	View
327	A 20.00 mL sample of an H₃PO₄ solution is titrated with 35.00 mL of a 0.100 M N…	CHM 101 Past Questions	View
328	How many moles of sulfate ions (SO₄²⁻) are present in 1.50 mol of Al₂(SO₄)₃?	CHM 101 Past Questions	View
329	A compound has the empirical formula CH₂O and a molecular mass of 90.0 g/mol. H…	CHM 101 Past Questions	View
330	How many grams of KBr are needed to prepare 250.0 mL of a 0.200 M solution? (K=…	CHM 101 Past Questions	View
331	In the reaction: SiO₂ + 3C → SiC + 2CO, if 30.0 g of SiO₂ reacts with 30.0 g of…	CHM 101 Past Questions	View
332	What mass of SiC can be produced from the reaction in the previous question? (S…	CHM 101 Past Questions	View
333	Calculate the number of moles in 5.00 g of Mg(NO₃)₂ (Mg=24, N=14, O=16).	CHM 101 Past Questions	View
334	What is the mass of 1 mol of Fe₂CO₃? (Fe = 55.8, C = 12, O = 16)	CHM 101 Past Questions	View
335	In Rutherford's gold foil experiment, what did the deflection of alpha particle…	CHM 101 Past Questions	View
336	What is the correct reduction half-equation from the reaction?	CHM 101 Past Questions	View
337	The hybridization of carbon in methane is....	CHM 101 Past Questions	View
338	Which scientist discovered the neutron?	CHM 101 Past Questions	View
339	If n = 2 and l = 1, what type of orbital is the electron in?	CHM 101 Past Questions	View
340	How many moles of KBr are required to prepare 0.0700 moles of Br₂ according to …	CHM 101 Past Questions	View
341	What was the significance of Millikan's oil drop experiment?	CHM 101 Past Questions	View
342	In Schrödinger's wave equation, what does the wave function (Ψ) represent?	CHM 101 Past Questions	View
343	What is the conjugate base of H₂SO₄?	CHM 101 Past Questions	View
344	What is the enthalpy of reaction for C₂H₄ + 3O₂ → 2CO₂ + 2H₂O, if the heat of f…	CHM 101 Past Questions	View
345	An Arrhenius acid is a substance that:	CHM 101 Past Questions	View
346	Which of the following statements reflects Aristotle's view of matter?	CHM 101 Past Questions	View
347	Which of the following is NOT an Arrhenius base?	CHM 101 Past Questions	View
348	Along the groups in the periodic table:	CHM 101 Past Questions	View
349	If the measured weight is 22.5 g and the true weight is 25.2 g, what is the abs…	Errors and Stoichiometry	View
350	Which of the following will change the value of equilibrium constant?	CHM 101 Past Questions	View
351	What is the Lewis base in the reaction BF₃ + NH₃ → F₃B-NH₃?	CHM 101 Past Questions	View
352	Why did Aristotle's ideas dominate scientific thought for nearly 2,000 years?	CHM 101 Past Questions	View
353	A system has 500 microstates. Calculate the entropy of the system in joules per…	CHM 101 Past Questions	View
354	For the balanced equation shown below, if the reaction of 35.5 grams of ZnS pro…	CHM 101 Past Questions	View
355	Which one of the following changes would alter the rate constant (k) for the re…	CHM 101 Past Questions	View
356	The equilibrium-constant expression depends on the ______ of the reaction.	CHM 101 Past Questions	View
357	The ΔU of a system that releases 12.4 J of heat and does 4.2 J of work on the s…	CHM 101 Past Questions	View
358	What was the fundamental idea proposed by Democritus about matter?	CHM 101 Past Questions	View
359	The mass in grams of 2.6 x 10²² chlorine atoms (35.5) is ---	CHM 101 Past Questions	View
360	What quantity of heat evolved with 5.550 mol H₂O(l) is formed from the combusti…	CHM 101 Past Questions	View
361	What is the mass of 1 mol of Fe₂CO₃? (Fe = 55.8, C = 12, O = 16) (duplicate)	CHM 101 Past Questions	View
362	In MnO₄⁻, the oxidation number of Mn is	CHM 101 Past Questions	View
363	What scientific principle was indirectly influenced by Democritus's idea of ind…	CHM 101 Past Questions	View
364	The law of mass action states that at a constant temperature, the rate of a che…	CHM 101 Past Questions	View
365	In the reaction Fe + Cu²⁺ → Fe²⁺ + Cu, what is oxidized?	CHM 101 Past Questions	View
366	Which of the following compounds is 38.86 % nitrogen?	CHM 101 Past Questions	View
367	The specific heat capacity of olive oil is 2.2 J/°C/g. How much energy, in kJ, …	CHM 101 Past Questions	View
368	Which of these is a Lewis acid?	CHM 101 Past Questions	View
369	Given the thermochemical equation: 2NO₂(g) → 2NO(g) + O₂(g) ΔH = 114 kJ. What i…	CHM 101 Past Questions	View
370	The acid in the equation NH₃ + H₂O → NH₄⁺ + OH⁻ is?	CHM 101 Past Questions	View
371	Which of the following is true at equilibrium?	CHM 101 Past Questions	View
372	The isomerization of cyclopropane follows first order kinetics. The rate consta…	CHM 101 Past Questions	View
373	The standard enthalpy changes of formation of H₂(g) and N₂(g) is 0. Calculate t…	CHM 101 Past Questions	View
374	Which of the following statements is not correct about the periodic classificat…	CHM 101 Past Questions	View
375	The high energy needed to overcome electrostatic force of attraction is respons…	CHM 101 Past Questions	View
376	Which of the following shows oxidation?	CHM 101 Past Questions	View
377	Hybridization which involves 33.3% s character and 66.66% p character is typica…	CHM 101 Past Questions	View
378	Which philosopher rejected the atomic theory and supported the idea of continuo…	CHM 101 Past Questions	View
379	Which does not describe a reaction at equilibrium?	CHM 101 Past Questions	View
380	When 30 cm³ of base YOH neutralizes 20 cm³ of acid HX, the ratio is	CHM 101 Past Questions	View
381	Which of the following experiments disproved the idea that the atom is indivisi…	CHM 101 Past Questions	View
382	For a first order reaction, the half-life is	CHM 101 Past Questions	View
383	At 25°C, the second-order reaction NOCl(g) → NO(g) + ½Cl₂(g) is 50% complete af…	CHM 101 Past Questions	View
384	According to Niels Bohr, electrons in atoms move in:	CHM 101 Past Questions	View
385	From left to right, each period of the periodic table terminates in a(n)	CHM 101 Past Questions	View
386	Which philosopher proposed the idea that atoms differ in shape and size?	CHM 101 Past Questions	View
387	A certain sample contains 4.86 moles of calcium carbonate. What is the mass of …	CHM 101 Past Questions	View
388	The isomerization of cyclopropane follows first-order kinetics. The rate consta…	CHM 101 Past Questions	View
389	For the reaction: N₂(g) + 3H₂(g) ⇌ 2NH₃(g), Kc = 0.50 at a certain temperature.…	CHM 101 Past Questions	View
390	Convert 25.0 °C to Kelvin.	CHM 101 Past Questions	View
391	A solution is prepared by dissolving 10.0 g of NaCl in enough water to make 250…	CHM 101 Past Questions	View
392	A piece of metal with a mass of 32.8 g is heated to 100.5°C and dropped into 13…	CHM 101 Past Questions	View
393	If 2.5 moles of zinc react with 6.0 moles of hydrochloric acid in the equation:…	CHM 101 Past Questions	View
394	The isomerization of cyclopropane to form propene is a first-order reaction. At…	CHM 101 Past Questions	View
395	Adenosine triphosphate (ATP) is the main energy storage molecule in cells. Its …	CHM 101 Past Questions	View
396	Titanium is prepared by the reaction of titanium(IV) chloride with molten magne…	CHM 101 Past Questions	View
397	What is the maximum amount of Ti that can be produced?	CHM 101 Past Questions	View
398	Determine which element is oxidized and which is reduced in the reaction CO + H…	CHM 101 Past Questions	View
399	When heated, lead nitrate decomposes according to the following equation. What …	CHM 101 Past Questions	View
400	Five 1 peseta coins from Spain were dropped into a graduated cylinder containin…	CHM 101 Past Questions	View

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