A helium balloon takes up 4.35 liters of space. Your friend is showing off his new chemistry skills and shows you his dimensional analysis to solve for the number of moles in this balloon. He found there would be 0.91 moles in the bottle. You know, of course, that this value makes no sense. Describe how you would teach him to determine if his dimensional analysis answers "make sense" using this situation as an example.

A quantity of substance that can be seen would be considered the A level.

Please answer question number 1 correctly with the correct answer. there is a picture of an example of a ''Dimensional analysis Format' below. please write out all work showing the math in dimensional analysis format.   Question 4: How many moles is 3.52 x 10^24 molecular water?

Laboratory 2 Report Sheet-Lab 2 A.2 Area Your measurements Length = Width = Area = (Show calculations.) Why could two students obtain different values for the calculated areas of the same rectangle? A.3 Volume of a solid by direct measurement Shape of solid Formula for volume of solid 18 Height Width Another student's measurements Volume of the solid (Show calculations of volume including the units.) Length Diameter (if cylinder) Page 3 of 3 482 words 区

Convert 75 miles into meters. (Use the conversion 1.0 km = 0.621 miles and use metric conversions for the rest of the conversions).

TRITT Part 3: Convert units of time. In chemistry, time is usually reported in units of seconds (s), minutes (min), and hours (hr). Use the conversion factors to change from one unit of time to another unit of time. Seconds → Minutes Seconds Hours Minutes →→→ Hours 10. Convert 35 minutes to hours 11. Convert 240 seconds to minutes 12. Convert 2.33 minutes to seconds 13. Convert 1.80 hours to seconds 60 s = 1 min 3600 s = 1 hr 60 min 1 hr LIVEWORKSHEETS

Suppose you were measuring out an organic liquid, and some of it is evaporated after you have performed the volumetric measurement while you are weighing out the sample. What effect would this have on the densities you calculated? Will you overestimate or underestimate the density of the liquid? Would this cause poor accuracy, low precision, or both? Explain briefly.

10. Classify the substance shown in the sketch below. Be sure you check all the boxes under the classification column that are correct for this substance. Substance 0 gas liquid solid Classification element compound mixture pure substance homogeneous mixture heterogeneous mixture

Errors of different varieties may arise throughout the course of an experiment. Below, match the different types of errors with their corresponding definitions. Group of answer choices Errors that have an equal chance to be positive or negative. These errors will arise because it is impossible to make any measurement completely exact. Errors that will have a consistent directional bias every time the experiment is carried out. These errors tend to always be positive or negative, meaning over or underestimating, respectively, the true value of the measurement due to experimental limitations. An error that is within the direct control and/or caused by a mistake from the chemist. Options Random error Systematic error Human mistake

Kindly help me with this please.