Answer the following question given this paragraph: Coefficients are used to balance chemical equations. A coefficient is a number placed in front of a chemical symbol or formula. It shows how many atoms or molecules of the substance are involved in the reaction. For example, two molecules of hydrogen would be written as 2H 2 . A coefficient of 1 usually isn't written. Q: What are used to balance chemical equations? Choices: - velocities - densities - fractions - coefficients A:
coefficients

Answer the following question given this paragraph: The classroom in Figure above has artificial light sources in addition to natural sunlight. There are fluorescent lights on the ceiling of the room. There are also projectors on the ceiling that are shining light on screens. In these and most other artificial light sources, electricity provides the energy and some type of light bulb converts the electrical energy to visible light. How a light bulb produces visible light varies by type of bulb, as you can see in Table below . Incandescent light bulbs, which produce light by incandescence, give off a lot of heat as well as light, so they waste energy. Other light bulbs produce light by luminescence, so they produce little if any heat. These light bulbs use energy more efficiently. Which types of light bulbs do you use?. Q: Aside from light, incandescent light bulbs also give off what that wastes energy? Choices: - temperature - humidity - electricity - heat A:
heat

Answer the following question given this paragraph: Work is done only if a force is exerted in the direction of motion. If the motion is perpendicular to the force, no work has been done. If the force is at an angle to the motion, then the component of the force in the direction of the motion is used to determine the work done. Q: Work is done only if a force is exerted in the direction of what? Choices: - wind - north - gravity - motion A:
motion

Answer the following question given this paragraph: Terrestrial biomes are determined mainly by temperature and moisture. Plants are the primary producers. Examples of terrestrial biomes include tropical rainforests, temperate grasslands, and tundra. Q: What are terrestrial biomes determined by? Choices: - moisture and elevation - pressure and temperature - time and temperature - temperature and moisture A:
temperature and moisture