Lab 2 Final, T6 (1)

As viewed from Earth, most stars appear to move across the sky each night because A stars orbit around Earth   B Earth rotates on its axis   C stars revolve around the center of the galaxy   D Earth revolves around the sun

To make 150ml of 300mM MgCl weigh ______ grams of NaCl, place in a graduated cylinder, and add water to make the total volume _____ mL.

Which number matches the mass of 25.23 g ________.   2523 μg   0.02523 dg   25230 mg   2.523 kg   25.23 cg

Table 1. Mass of measured liquids. Weight (Mass) Accuracy Precision Standard Deviation Average Volume XXXXX XXXXX 50 ul 0.069 XXXXX XXXXX 50 ul 50 ul O.069 XXXXX XXXXX 150 ul 291-0 0.16 aXXXXX XXXXX 150 ul 150 ul 0.140 XXXXXX XXXXXX 300 ul XXXXXX XXXXXX 300 ul 0.503 300 ul XXXXXX XXXXXX 800 ul .01 I XXXXXX 800 Hl 0.969XXXXXX 800 Hl

Question 4

Chapter 1 Item 10 Use appropriate metric prefixes to write the following measurements without use of exponents. 2.3 x 10-10 L O 0.23 µL 2.3 nL 23 ML 0.023 nL 2.3 µL 0.23 nL Submit Request Answer P Pearson Privacy Po Copyright O 2020 Pearson Education Inc. All rights reserved. | Terms of Use 719% Learch F2 F3 F6 F4 F5 F7 F11 F9 F8 F10 24 & 3 * 00

Which instrument would be used to measure the volume of a diamond? 1. graduated cylinder 2.triple-beam balance 3. Celsius thermometer 4. metric ruler

A human hair is 75 um across. How many inches is this? STARTING AMOUNT ADD FACTOR ANSWER RESET *( ) %D 0.01 100 10 1 1x 10° 1 x 10-6 0.1 2.54 1 x 106 0.33 0.001 0.003 3.0 1 x 10-9 75 1000 0.00003 in mm cm um 30

Measure the length of the crayon with correct precision and units

How to do the graph base on these results.

How to use a conversion factor to find 1 µg = ________ pg?

A pure substance that is composed of only one type of atom is______.   Group of answer choices a particulate a homogeneous mixture a heterogeneous mixture an element a macroscopic particle

Convert 341 cg to kg A.3.41 x 10-3B.3.41 x 10-7C.3.41 x 10-5D.3.41 x 10-2

Use the data set below to answer the following question. This is a fictitious data set, so no units are listed. Data Set 282 294 270 276 232 295 For the data set above, the Q-test suspect value is type your answer. and based on the statistics you can choose your answer. that value with 90% confidence.

atory Glassware D. 10 mL volumetric flask Mass of volumetric flask 1.6089 Volume of water measured in each trial 10:00 ml Calculated density of water (g/mL) Mass of volumetric Trial Mass of water (g) flask and water (g) 11.5529 ip.432/9 11.4239 1.14529/mL 1.14329/mL 1.1723 9/mL 1.1H6 glmL 21.452 9 21. 4329 21.4239 4. 21.4169 Average density -1431 glmL Standard deviation in density Percent error in density 1.

8 cm3 = __________ L Group of answer choices .0227 22.7 57800 .0578

Please help with 7&8

The density of mercury is 13.6 g/cm3. The density of mercury is ________ kg/m3. Group of answer choices

•All groups will add nystatin (an antifungal) to their tubes. The stock concentration is (50 mg/mL). The final concentration will be 50 µg/mL. ● • Calculate how much nystatin will be added to your TSA tubes. Each 15 mL TSA tube will get final concentration of 50 µg/mL. The …... will be used. Pipettor Blue Yellow Grey Volumes 100 - 1000 μL 10 - 100 μL 1-10 μL μL of nystatin to give a pipettor

Use water displacement method: measure to the 10ths place!

After analyzing soil samples, we found 70 mg arsenic in 120 kg soil. Concentration of arsenic in the soil = ________ ppmm

Complete the following addition and subtraction problems in scientific notation.a. (6.23 × 1 0 6 kL) + (5.34 × 1 0 6 kL)b. (3.1 × 1 0 4 mm) + (4.87 × 1 0 5 mm)c. (7.21 × 1 0 3 mg) + (43.8 × 1 0 2 mg)d. (9.15 × 1 0 -4 cm) + (3.48 × 1 0 -4 cm)e. (4.68 × 1 0 -5 cg) + (3.5 × 1 0 -6 cg)f. (3.57 × 1 0 2 mL) - (1.43 × 1 0 2 mL)g. (9.87 × 1 0 4 g) - (6.2 × 1 0 3 g)h. (7.52 × 1 0 5 kg) - (5.43 × 1 0 5 kg)i. (6.48 × 1 0 -3 mm) - (2.81 × 1 0 -3 mm)j. (5.72 × 1 0 -4 dg) - (2.3 × 1 0 -5 dg)

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The numbers are 2.1, 2.2, 2.6, 2.3 The accepted density is 2.702