Random question?

Hydrogen is located on the left side of the periodic table in the same column as the alkali metals, but it has characteristics of a nonmetal. Which of the following is a physical property of hydrogen?

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Question generated: Based on the evidence available at the time, early models of the solar system stated that all objects in space orbited Earth. In the 16th century, an astronomer reevaluated the evidence and proposed a model of the solar system that is still in use. What part of this model corrected the mistake in previous solar system models?

Problem: Write a question you would see in a school textbook.

Answer: Which of the following is an example of a container that is filled with a pure substance rather than with a mixture?

question: Write a question you would see in a school textbook. OPTIONS:
- The clouds in the stratosphere produce more rain.
- The air in the stratosphere has a greater density.
- The composition of the stratosphere lacks ozone.
- The temperature of the stratosphere warms at higher altitude.
answer: How is the stratosphere different from the troposphere?

An example of a grad-school level question?
Water moves by capillary action through soil from moist areas to dry areas. Which property of water is most responsible for this capillary action?

Random question?
A student conducts an experiment using a common but potentially harmful bacteria culture. After working with the bacteria, which is the most important safety practice to follow?