Calculate the number of grams of three ionic salts needed to make the appropriate molarity of solution.Įvaluate the claims, evidence, and reasoning behind the idea that electromagnetic radiation can be described either by a wave model or a particle model, and that for some situations one model is more useful than the other.Ĭlick to view other curriculum aligned to this Performance Expectation.Explain that some wavelengths of light are in the visible light range while others are not, but nonetheless can cause chemical reactions.Explain that energy received by electrons to move them to an excited state is quantized.This unit's challenge question includes aspects of environmental engineering (effect of pollution on the Earth's ozone layer and consequences to public health) and biomedical engineering (use of nanoparticles in medical technologies).Īfter this activity, students should be able to: As part of their research, chemical engineers use the flame test to identify an element based on the color it emits when placed in a flame-a low-tech and reliable method of identification. This engineering curriculum aligns to Next Generation Science Standards ( NGSS).īefore beginning to design a solution to a problem, engineers must research the concepts involved. They also calculate the frequency of energy for the solutions. After calculating and then preparing specific molarity solutions of strontium chloride, copper II chloride and potassium chloride (good practice!), students observe the distinct colors each solution produces when placed in a flame, determine the visible light wavelength, and apply that data to identify the metal in a mystery solution. Send us feedback about these examples.To become familiar with the transfer of energy in the form of quantum, students perform flame tests, which is one way chemical engineers identify elements-by observing the color emitted when placed in a flame. These examples are programmatically compiled from various online sources to illustrate current usage of the word 'strontium.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2023 The elements strontium and lithium will produce red light. 2023 Older rock formations including granite are found to have more strontium than younger rocks like basalt, and this is reflected in the vegetation that grows around them. Bob Holmes, Smithsonian Magazine, 17 Aug. 2023 Before there was much human activity, the strontium isotope ratio shows that the caribou spent much of their summer along the coast. 2023 The group knew that in strontium ruthenate, electrons travel from atom to atom using one of three distinct channels. Richard Grant, Smithsonian Magazine, 24 Oct. 2023 By analyzing the strontium values in 162 of these rodents, the team was able to build up a strontium map of Alaska. 2023 The museum’s director, a paleontologist named Patrick Druckenmiller, who contributed to the Kik study, says strontium isotypes in these rodents’ teeth offered the key mapping aid. 2023 In a separate study, a different group of researchers-also based at CU Boulder-used lasers to hold strontium atoms in a single two-dimensional plane. Recent Examples on the Web Meanwhile Wooller and his colleagues were looking at the strontium and other isotopes in Kik’s tusk.
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