*Question*
Q: Both diffusion and effusion are related to the speed at which what objects move? Read this paragraph and choose the correct option from the provided answers: A related process to diffusion is the effusion. Effusion is the process of a confined gas escaping through a tiny hole in its container. Effusion can be observed by the fact that a helium-filled balloon will stop floating and sink to the floor after a day or so. This is because the helium gas effuses through tiny pores in the balloon. Both diffusion and effusion are related to the speed at which various gas molecules move. Gases that have a lower molar mass effuse and diffuse at a faster rate than gases that have a higher molar mass. Choices: - electricity - copper molecules - solids - gas molecules A:
**Answer**
gas molecules

*Question*
Q: What laboratory instrument is used to analyze and test for static charge? Read this paragraph and choose the correct option from the provided answers: A laboratory instrument used to analyze and test for static charge is called an electroscope. Seen below, an electroscope consists of a metal knob connected by a metal stem to two very lightweight pieces of metal called leaves, shown in yellow. The leaves are enclosed in a box to eliminate stray air currents. Choices: - microscope - bunsen burner - microtome - electroscope A:
**Answer**
electroscope

*Question*
Q: What term is used to describe the electrostatic process used by most copy machines? Read this paragraph and choose the correct option from the provided answers: Xerography Most copy machines use an electrostatic process called xerographya word coined from the Greek words xeros for dry and graphos for writing. The heart of the process is shown in simplified form in Figure 18.39. A selenium-coated aluminum drum is sprayed with positive charge from points on a device called a corotron. Selenium is a substance with an interesting propertyit is a photoconductor. That is, selenium is an insulator when in the dark and a conductor when exposed to light. In the first stage of the xerography process, the conducting aluminum drum is grounded so that a negative charge is induced under the thin layer of uniformly positively charged selenium. In the second stage, the surface of the drum is exposed to the image of whatever is to be copied. Where the image is light, the selenium becomes conducting, and the positive charge is neutralized. In dark areas, the positive charge remains, and so the image has been transferred to the drum. The third stage takes a dry black powder, called toner, and sprays it with a negative charge so that it will be attracted to the positive regions of the drum. Next, a blank piece of paper is given a greater positive charge than on the drum so that it will pull the toner from the drum. Finally, the paper and electrostatically held toner are passed through heated pressure rollers, which melt and permanently adhere the toner within the fibers of the paper. Choices: - electrography - titanomachy - microphotography - xerography A:
**Answer**
xerography

*Question*
Q: What does the large central vacuole do? Read this paragraph and choose the correct option from the provided answers: First, plant cells have a large central vacuole that holds a mixture of water, nutrients, and wastes. A plant cell's vacuole can make up 90% of the cell's volume. The large central vacuole essentially stores water. In animal cells, vacuoles are much smaller. Choices: - use water - create glucose - heat water - store water A:
**Answer**
store water