Chemistry, 26.07.2019 15:30 janeou17xn
Alightweight material is being tested for effectiveness in blocking ultraviolet (uv) rays from the sun that cause skin to burn and possibly develop skin cancer. which method would be most for testing this material? use specialized equipment to measure how much uv light passes through stacks of one, five, or 20 layers of the material. test the material in controlled natural settings by using natural uv light, and measure the uv light that passes through. write a survey that asks people on beaches about their preferences for sunscreen and protective materials. test the material in a lab setting by using humans and a variety of uv light sources, and develop a scale to measure the damage that is caused to human skin.
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Chemistry, 22.06.2019 08:30, Apple557
The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.
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