Give the reason why the empty crucible should be heated before starting the experiment

How many atoms or molecules are in 5.0 moles of the following? a. O b. N c. MgCl₂ d. C₂H₃NO

An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11. how many electrons does boron have? 11 15 5 2

Which one of the following steps is not a part of the scientific method a - perform experiments to test the predictions b - repeat the experiments until the answers match the predictions c - formulate a general rule based on the predictions and

In free fall, all objects fall with the same acceleration. O A. True O B. False

Compare the amount of carbon dioxide released in one year from burning coal to power 10, 65-watt incandescent bulbs with the amount released from powering 10, 13-watt compact fluorescent light (CFL) bulbs.

How might we create the best possible solution to a problem?

A runner at a track meet completes exactly one lap around a 400 m track. what is the distance? what is the displacement?

Match the following with their correct molecular weight. 2-butanone Propyl acetate 4-methyl-2-pentanone Butyl acetate Methanol Ethanol A. 46.07 g/mol B. 116.16 g/mol C. 102.13 g/mol D. 100.16 g/mol E. 32.04 g/mol F. 72.11 g/mol

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Explain how using dimensional analysis could have prevented this crash