Counting Atoms Lab Report

1. Which of the following samples may be weighed on an analytical balance without a container? A.glass beads B. dry sand C.paper clips D.sucrose E. all the above 2. Touching the sample container with bare hands without gloves affects the mass recording of an analytical balance due to moisture on the hands. A. true B. False

i think this is physics and chemistry so i hope you can help me to answer this, only TRUE OR FALSE

A sample of chloroform is found to contain 12.0 g of carbon, 106.4 g of chlorine, and 1.01 g of hydrogen. If the second sample of chloroform is found to contain 26.2 g of carbon, what is the total mass of chloroform in the second sample?Mass = ______ g chloroform

Please help with #3

Part C 7.7 g of H₂O Express your answer using two significant figures. 72H₂O Submit Part D nBaSO4 Submit LIVE ΑΣΦ 313 g of BaSO4 Express your answer using three significant figures. Tama Request Answer IVD ΑΣΦ → o Request Answer O ? ? mol mol COLO27 2740IN

Please help with question 7

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Please help with #5

Measurements 1. Exercise 3. a. Which 10 measurements shall have uncertainty values based on the images shown here and why? b. Explain Accuracy and Precision using the images in this slide -80 3. 2. 15 20 cm 100

Please help with question 8

Please help with question 8

Solve this

In 3C02 (carbon dioxide gas) + 4H2 O (water), the ratio of carbon dioxide to water is tly sunny 4:3 3:4 O 1:1 O 2:1 F2 -0- @ F3 -0+ # F4 CO $ F5 % 5 F6 * F7 6 4- F8 & 7 F9 ★ 8 F10 28 9 F11 ( F12 0 A Prt Sc

I have the total mass incorrect . Can u please explain what am I doing wrong. Thanks