The projection lens in a slide has a focal length of 8cm . The distance between lens and the slide is likely to be A. 80mm B.75mm C. 125mm D 200mm

Give one example to show that when substances are mixed, it may result in a chemical or a physical change depending on the conditions.

The bubbles in a carbonated soft drink are produced when carbonic acid decomposes to form carbon dioxide and water. in a closed system, this equilibrium exists as why does a carbonated soft drink lose carbonation when the container is left open? a. water evaporates, which favors the formation of h2co3. b. pressure decreases, which favors the formation of h2co3. c. the open container warms up, which causes more gas to escape. d. co2is removed, which favors the formation of h2co3.

Element with 5protons and 3neutrons