Which of the following is a good practice in weighing solid samples?АDo not return the mass settings to zero mark; let the next user tare it for you.BUse weighing paper, a watch glass, a beaker, or some other container to measure mass of your solid samples.Place chemicals directly on the balance pan.DFor different trials of an experiment, use multiple balance for your measurements.

For accurate and pure weighing of solid samples Use weighing paper, a watch glass, a beaker, or some…

Answered: Which of the following is a good…

Chemistry for Today: General, Organic, and Biochemistry

9th Edition

ISBN:9781305960060

Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen

Publisher:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen

Chapter1: Matter, Measurements, And Calculations

Section: Chapter Questions

Problem 1.28E

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Which of the following is a best practice in weighing solid samples? A Do not return the mass settings to zero mark; let the next user tare it for you. B Place chemicals directly on the balance pan. Use weighing paper, a watch glass, a beaker, or some other container to measure mass of your solid samples. D For different trials of an experiment, use multiple balances for your measurements.
Suppose a student measured the mass of a sample that has a known mass of 40.5809 g using an analytical balance. The mass they observed was unstable, constantly jumping between 39.5 and 41.5. Choose all of the following reasons that could cause this error. O The doors to the analytical balance were not closed completely, allowing an air current to circulate inside the balance. One weigh boat was used to tare the balance while a different one was used when the sample was massed. Twice the amount of sample was placed on the analytical balance. O The sample was heated, causing a convective flow.
Which of the following is a best practice in weighing solid samples? A) Use weighing paper, a watch glass, a beaker, or some other container to measure mass of your solid samples. Do not return the mass settings to zero mark; let the next user tare it for you. For different trials of an experiment, use multiple balances for your measurements. Place chemicals directly on the balance pan.
A student performed an analysis of a sample for its calcium content andgot the following results: 14.92% 14.91% 14.88% 14.91%The actual amount of calcium in the .sample is 15.70%. What conclusions can you draw about the accuracy and precision of these results?
O MEASUREMENT AND MATTER W start Page Predicting the units of the solution to a basic quantitative... A student sets up the following equation to solve a problem in solution stoichiometry. (The ? stands for a number the student is going to calculate.) Enter the units of the student's answer. 1 mL 0.59 mL - 3 10 x10 108.39 mol II
1 Which is NoOTa property Used to identity substances? A Density B. Electrical Properties C Mase 2.2A/company cotects eans to recyciel Some cans aremade'of álumntniumn and others are ade of steel What pitysical property couldbeused to separata and classfy the differerit tyses of cans?* O A Magnetism O B Shape C Size DSolubility
42.How many of the following should be included in a good hypothesis? (i) A prediction of the results of the experiment (ii) A step-by-step walkthrough of how to do the experiment with specific references to amounts of reactants, glassware used, and other experimental details (iii) A summation of the data collected after doing the experiment, with comments on accuracy and precision if possible. (iv) A detailed list of chemicals that will be used (v) Waste disposal procedures (vi) A brief scientific explanation of the predicted results. Said another way, the hypothesis should include a scientific explanation of why the predicted results are expected. A. 1 B. 2 C. 3 D. 4 E. 5
Why is it inappropriate to report yields with decimal-place accuracy (as opposed to whole numbers)?
When asked to record the buret reading shown below, a student wrote down a reading of 33.850 mL. mL 33 34 Indicate if their reading is correct or why it is incorrect. Select one: O Their reading is correct. O The solution level was read incorrectly. O The student did not record to enough decimal places. The reading has too many decimal plaoo0
You must show calculations in the space pr receive credit. he line to 1. The following data was obtained by a student heating a mixture of BaCl2•2 H2O and an inert material. Calculate the percent of BaCl2•2 H2O in the sample 24.525 g 26.716 g 26.504 g olod slam Lo Mass of crucible Mass of crucible and mixture Mass of crucible and mixture after heating mby

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