Explain why none of the lanthanoid sesquioxides, Ln2O3, is as acidic as Al2O3

Explain why none of the lanthanoid sesquioxides, Ln₂O₃, is as acidic as Al₂O₃

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第1题

Explain why nuclear magnetic resonance experiments show only one type of hydrogen atom in the ion.

Explain why nuclear magnetic resonance experiments show only one type of hydrogen atom in theion.

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第2题

The solubility of CuS in pure water is 3.3×10-4 g/L at 25℃. Using this number,calculate the apparent

The solubility of CuS in pure water is 3.3×10^-4g/L at 25℃. Using this number,calculate the apparent value offor CuS. By precise measurement, the value offor CuS at 25℃ is found to be 8.×10^-36. Explain why CuS is more soluble than predicted by the.

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第3题

What is the main purpose of this passage？A．To describe an experiment in which a Hydrapulpe

What is the main purpose of this passage？

A．To describe an experiment in which a Hydrapulper is used.

B．To introduce Hydrapulper, a new type of garbage disposer.

C．To tell what the writer thinks of the recycling of garbage.

D．To explain why garbage should be recycled in a new way.

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第4题

The timing of flu season is a little hard to predict. Part of what makes it unpredictable

is that scientists still don t understand exactly why we have one at all. There have been lots of theories: One theory is that people spend more time indoors, with the windows closed, breathing each other s air. Other scientists have argued that cold of winter weakens our immune systems. A third theory is that the flu virus lives in the cold, dry air, but suffers in the warm, humid air. For a while, scientists had a hard time testing these theories: they needed to run experiments, but researchers aren t allowed to infect humans with illnesses, and most lab animals arent affected by the flu the same way people are. In 2007, a medical researcher named Peter Palese found an 80-year-old journal article that reported that guinea pigs (豚鼠)get infected and pass on the flu just like humans. Palese decided to test Theory 3. The research team led by Palese ran several experiments and in each experiment, they injected half the guinea pigs with influenza A (the common flu), and put them in a box next to a box of uninfected animals. At a temperature of 41 degrees, all four of the exposed guinea pigs caught the flu, but when Palese repeated the experiment at 68 degrees, only one of the animals was infected. And when he ran the test at 86 degrees, none of the exposed animals got sick. The researchers also ran experiments where they varied the humidity in the room but kept the temperature constant: the drier the air, they found, the more animals got sick. Palese s study showed that the influenza virus does spread more effectively in cold, dry air.

What does Paragraph 3 mainly discuss？

A．The direction for future research.

B．The necessity of running more tests.

C．The difficulty of testing the theories.

D．The cost of animal experiments.

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第5题

Explain the difference between an adsorption chromatography and a partition chromatography.

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第6题

A．employB．emphasizeC．explainD．comprise

A.employ