Chemistry of the environment：練習題

Which gas is a toxic air pollutant primarily produced by the incomplete combustion of carbon-containing fuels?

A scientist analyzes a sample of clean, dry air. The sample contains nitrogen, oxygen, and a small remainder of other gases.

What is the correct approximate percentage by volume of nitrogen and the main noble gas present in the remainder?

A student uses a test to confirm the presence of water in an unknown liquid. The student adds the liquid to a sample of anhydrous cobalt(II) chloride.

Which observation confirms that water is present?

Greenhouse gases contribute to global warming by interacting with thermal energy. Which statement correctly describes how carbon dioxide and methane affect the Earth's atmosphere?

Domestic water supplies undergo several treatment steps before being safe for use. A specific process is used to remove tastes and odours from the water.

Which substance is used for this purpose?

Explain how the greenhouse gases carbon dioxide and methane contribute to global warming by describing their interaction with thermal energy.

Domestic water supply undergoes several treatment stages. Explain the specific purpose of sedimentation, the use of carbon, and chlorination in making water safe for human consumption.

Describe the chemical test for the presence of water using anhydrous copper(II) sulfate and state the observed colour change.