Chemistry

Chemistry, 29.09.2019 05:50, gafsh272833

Why is it necessary to wait 10 minutes before adding iki solution to the test tubes?

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Biology, 28.07.2019 12:00, c4thegoat

In an experiment, sugar cookies are ground up into small particles. one gram of the sugar cookie powder is added to each of 4 test tubes. 5 ml of distilled water are placed into each test tube, and each tube is shaken gently until a solution is created. a different indicator is used on each test tube to detect the presence of a particular nutrient. the test tubes are then heated gently.which indicator would most likely yield a positive test, by way of a color change, in the water-cookie solution? of a color change, in the water-cookie solution? a) biuret solution b) sudan red test c) phenol red test d) benedicts solution

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Mathematics, 27.09.2019 13:30, garciagang0630

In a laboratory, a technician combines a salt solution contained in 27 test tubes. each test tube contains 0.06 liter of the solution. if he divides the total amount into test tubes that hold 0.3 liter each, how many test tubes will he need?

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Engineering, 07.10.2019 17:30, mandylo5418

Place test tubes containing approximately equal volumes in opposite positions on the rotor. wait until all positions on the rotor contain a test tube before activating the centrifuge. never put stoppers or other items in the centrifuge with your tubes. carefully stopper the test tubes to ensure the liquids do not spill out. (b) when operating the centrifuge, students should do which of the following? make sure that the lid is completely shut and the safety knob is turned to engage the safety switch. centrifuge for approximately 30 minutes. centrifuge for approximately 30 seconds. mid-way through the process, open the lid of the centrifuge and check to be sure it is operating. (c) when the centrifuge process is complete, students should do which of the following? wait for the rotor to come to a complete stop before attempting to remove your test tubes. using the eyehole on top, monitor the spinning rate and open the lid only after the rotor has slowed significantly. immediately open the lid of the centrifuge to remove the test tubes before they are damaged. reach out and carefully slow the rotor with your hand so you may finish the lab faster.

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Chemistry, 17.10.2019 10:20, saren47

Mrs. rushing has 3 chemistry classes with 24 students in each. an experiment calls for each student to use 4 test tubes. how many test tubes are needed in all for her classes? a.) 32 test tubes b.) 96 test tubes c.) 288 test tubes d.) 384 test tubes

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