![]() Given that it gives protons rather than hydride ions, it must be an acid.ĭ. Since it contributes hydride ions rather than protons, it is not an acid.Ĭ. Since it gives protons rather than hydride ions, it is not an acid.ī. LiAlH4 must have which of the following characteristics in order to function as a reducing agent?Ī. In a solution, LiAlH4 will dissolve into hydrogen ions, which will then decrease the target substance. ![]() Chemical species can receive hydrogen ions from reducing agents like LiAlH4. The titrant has completely neutralized the acid.ġ8. The titrant has neutralized half of the base.ĭ. The titrant has neutralized all of the bases.Ĭ. The titrant has neutralized half of the acid.ī. An acid-base titration reaches its equivalence point when…Ī. A titration is used by a scientist to carefully add a base to the solution in order to study the acid HA. There will be no change in the HA concentration.ġ7. The amount of HA will rise in concentration.ĭ. The amount of HA will drop in concentration.Ĭ. The level of A will rise in concentration.ī. Which of the following is most likely true if the scientist increases the vessel's temperature after the reaction has reached equilibrium?Ī. A scientist investigating the acid HA discovers that when the acid dissociates in solution, heat is produced. Thus, bases are defined as proton acceptors using the Brønsted-Lowry definition, whereas acids are defined as proton donors.ġ6. A- receives the proton in the opposite process to regenerate HA. Similar to the Arrhenius definition, the Brønsted-Lowry definition also includes conjugate bases, such as the A- in the preceding process, as hydroxide donors. Arrhenius acids and Brønsted-Lowry acids both achieve equilibrium by the identical dissociation reaction, but the acid character is determined by distinct factors. Brønsted-Lowry acids and bases are not always Arrhenius acids and bases and vice versa. Greater than 5730 years, but less than 11460 yearsĪ more complete definition of an acid is provided by Brønsted-Lowry. How ancient is a sample if the carbon-14 to carbon-12 ratio is 25% lower than the ratio that naturally occurs?ĭ. While the half-life of carbon-12 is practically limitless, that of carbon-14 is around 5730 years. What distinguishes the parent nuclide's atomic number from the daughter nuclide's atomic number?ġ2. Two positron decays, two gamma decays, and two alpha decays occur in a nuclide. Just before he touches down on the groundġ1. When is the angle between his acceleration and velocity vectors the largest?ĭ. A firefighter jumps horizontally, at a speed of 1.5 m/s, from a blazing structure. Before the ball and rock reach the earth, they will clash in the air.ġ0. The ball and rock will both fall to the ground simultaneously.ĭ. A ball (m = 0.5 kg) is launched horizontally while a rock (m = 2 kg) is launched vertically. What connection exists between the maximum elevator cable tension and the maximum elevator weight as the elevator accelerates upward?ĩ. An elevator is built to go upward at a speed of 5 m/s after an initial phase of acceleration and to support a weight limit of 9800 N (including its own weight). How much effort is needed to prevent the wagon from falling off the plane on average?Ĩ. The plane's angle with the horizontal is 30°. A 10 kg wagon is at rest on an inclined plane with no friction. The information provided does not allow for a determination.ħ. How is the frictional force impacted by increasing the angle of the slope, assuming there is friction between the wagon and the ramp?ĭ. On top of a 15-meter long, 30° inclined lane, a 20 kg wagon is let go of its resting position. How much of the medicine will still be in t the mouse after 24 hours if its half-life is 6 hours?Ħ. The group 3 mouse receives 50 mg of oxaliplatin. Which of the following statements, correspondingly, best describes products 1 and 2?ĥ. In contrast to product 2, which both forms and destroys slowly, product 1 forms and degrades swiftly. Researchers perform a reaction and count the number of two products that result. The composition and rate of accelerationĤ. Which of the following cannot be measured simultaneously, according to the Heisenberg uncertainty principle?ĭ. ![]() If her father weighs 90 kg, where must he sit to balance the seesaw?ģ. A 30 kg girl is seated on a seesaw two meters away from the pivot point. What is the distinction between his displacement and his trip distance?Ģ. A man moves 30 meters east, then 40 meters north.
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