Biology

Biology, 16.09.2019 03:20, xXFLUFFYXx

Explain why liquids in a test tube form a meniscus

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Chemistry, 26.08.2019 23:30, axleon11

Your chemistry experiment requires you to mix two chemicals in a test tube. to safely observe the chemical reaction you should: a- peer into the test tube from a safe distance b- keep your hand between eyes and the opening of the test tube c- keep the end of the test tube pointed away from you d- put your safety glasses on while peering into the test tube

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Chemistry, 29.08.2019 18:00, UltimateGoal

5. parallax error parallax is defined as an apparent displacement of orientation of an object viewed along two different lines of sight. in every apparatus where the volume is defined by a concave meniscus, the reading or setting is made on the lowest point of the meniscus. in order that the lowest point may be observed, it is necessary to place a shade of some dark material immediately below the meniscus. the meniscus of most liquids used in volumetric standards is concave, and the lowest point in the center of the meniscus is used to determine the correct volume reading. the meniscus formed by a non-wetting liquid, such as mercury (hg), is convex with the highest point in the center. the highest point of such a convex meniscus is used to make the reading. for opaque liquids it is difficult to observe the lowest point of the meniscus, therefore the upper meniscus is used to determine the reading. when reading any meniscus, it is very important to ascertain that the measuring device with the liquid is kept on a flat surface and the observation should be made at the eye level.

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Chemistry, 22.09.2019 07:50, fdryktysysmzet3640

The liquids hexane and water are placed in a test tube. the test tube is stoppered, shaken, and placed in a test tube rack. the liquids separate into two distinct layers because hexane and water have different (1) formula masses (2) molecular polarities (3) ph values (4) specific heats

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Chemistry, 26.09.2019 06:10, martl4175

Astudent mixes two clear liquids together. after a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. which of the following is a conclusion that the student can draw based on these observations? a: the two liquids are toxic and should be handled with extreme caution. b: the two liquids were pure substances before they were mixed. c: the two liquids have been stored too long and are no longer good. d: the two liquids have gone through a chemical change in which a new substance called a precipitate was produced.

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