In which situation should gloves be worn in the laboratory
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"Gloves must be worn when handling hazardous chemicals or materials, corrosives, very hot or very cold items, or materials that have an unknown hazard or toxicity."
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Cell Structures Quick Check
Questions: 1.Why are lysosomes important to the health of cells? 2.Which of the following organelles provide structure and rigidity to a plant cell? 3.What would happen to a plant if the chloroplasts in its cells became damaged? 4.A cell sends messages to
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Which strategy can scientists use to learn about Earth's deepest layers?(1 point) a)use mining technology to drill as deep as possible b)compare samples from different areas of Earth's crust c)recreate high-pressure conditions in a laboratory d)test how
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A laboratory procedure calls for making 400.0 mL of a 1.1 M NnO3 solution. What mass of NaNO3 (in g) is needed?
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A. What is the mass of a book that weighs 3.20 N in the laboratory? B.In the same lab, what is the weight of a dog whose mass is 14.0 kg?
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A small block with a mass of m = 0.120 kg is attached to a cord passing through a hole in a frictionless, horizontal surface. The block is originally revolving at a distance of 0.40 m from the hole with a speed of 0.70 m/s. The cord is pulled from below,
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The number of yeast cells in a laboratory culture increases rapidly initially but levels off eventually. The population is modeled by the function n = f(t) = a/(1 + be^−0.5t) where t is measured in hours. At time t = 0 the population is 10 cells and is
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Bourgeois by Alfred Jacob Miller Look at the following illustration of an early american settler. it would likely inspire a writer to create a story based on all of the following historic information except A) the clothing worn by the individuals B) the
- asked by Ana
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A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400mL of a solution that has a concentration of Na+ ions of 1.10M ?
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How is writing an equation to represent a situation involving two variables similar to writing an equation to represent a situation involving only one variable? How is it different?
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A major-league catcher gloves a 92 mi/h pitch and brings it to rest in 0.15 m. 1-If the force exerted by the catcher is 803 N, what is the mass of the ball?
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An experiment in your laboratory requires 500 mL of a .0200 M solution of Na2CO3. You are given solid Na2CO3, distilled water and a 500 mL volumetric flask Describe how to prepare the required solution showing all calculations and describing each step
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This is for the pretest. What is the solution to the system of equations pictured below? A.(-3,5) B.(-3,-2) C(3,4) D.(1,2) E(6,-2) When writing in slope intercept form what does the 'm" Represent? What is the 'b'? A. M is the x value and b is the number B.
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A loaded elevator with very worn cables has a total mass of 2200kg, and the cables can withstand a maximum tension 28 000N a) what would be the maximum upward acceleration for the elevator if the cables are not to break? b) what would be the answer to part
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Under a set of controlled laboratory conditions, the size of the population of a certain bacteria culture at time t (in minutes) is described by the following function. P = f(t) = 3t^2 + 2t + 1 Find the rate of population growth at t = 10 min. bacteria per
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Identify the incorrectly punctuated sentence. a. Edwin is going out to dinner and to the movies. b. Anne is going with him, but she is not ready. c. She needs to put on gloves, a scarf, and a hat. d. He washed his hair brushed his teeth, and shined his
- asked by Kaai97
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A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 750 mL of a solution that has a concentration of Na^+ ions of 1.3 M? Express your answer numerically
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What might be the hazards of living near the Ring of Fire? Which of the five themes apply to this situation? My answer: The hazards of living near the Ring of Fire are frequent volcano eruptions and earthquakes. Region and human-environment interaction
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The molarity of concentrated HCl purchased for laboratory use is approximately 12.1 M. How many milliliters of this reagent should be diluted to 1.000 L to make 0.100 M HCl?
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Without his glasses, Isaac can see objects clearly only if they are less than 4.2 m from his eyes. What focal length glasses worn 2.2 cm from his eyes will allow Isaac to see distant objects clearly? Our book says to convert the cm to m and subtract the
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Grade 9 Science
In each situation s below , it seems that a new substance may have been produced. Explain why each situation represents a physical change. a) A tailor makes a new suit out of a piece of fabric. b) A chef makes a salad out of lettuce, tomatoes and
- asked by Sally
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