Q: What are two basic types of pollutants in the air? Read this paragraph and choose the correct option from the provided answers: There are two basic types of pollutants in air. They are known as primary pollutants and secondary pollutants. Choices: - smog and coal - organic and inorganic - pesticides and smog - primary and secondary pollutants A:
primary and secondary pollutants

Q: Group 13 of the periodic table is also called what? Read this paragraph and choose the correct option from the provided answers: Group 13 of the periodic table is also called the boron group because boron (B) is the first element at the top of the group (see Figure below ). Boron is also the only metalloid in this group. The other four elements in the groupaluminum (Al), gallium (Ga), indium (In), and thallium (Tl)are all metals. Group 13 elements have three valence electrons and are fairly reactive. All of them are solids at room temperature. Choices: - nitrogen group - iron group - manganese group - the boron group A:
the boron group

Q: The oxygen regions of the water molecules have what kind of charge? Read this paragraph and choose the correct option from the provided answers: Choices: - positive - neutral - certain - negative A:
negative

Q: What light-producing process occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light? Read this paragraph and choose the correct option from the provided answers: A fluorescent light bulb produces visible light by fluorescence. Fluorescence occurs when a substance absorbs shorter-wavelength ultraviolet light and then gives off the energy as visible light. The compact fluorescent light bulb (CFL) in the Figure below contains mercury gas that gives off ultraviolet light when electricity passes through it. The inside of the bulb is coated with a substance called phosphor. Phosphor absorbs the ultraviolet light and then gives off most of the energy as visible light. Choices: - candescence - resistance - luminescence - fluorescence A:
fluorescence