Is the use of reliable knowledge for a practical purpose.

For the reaction n2 (g) + 2h2 (g) â n2h4 (l), if the percent yield for this reaction is 77.5%, what is the actual mass of hydrazine (n2h4) produced when 27.70 g of nitrogen reacts with 4.45 g of hydrogen?

Is a whale a abiotic or biotic

Which element is most likely to carry electric current easily? tin (Sn) sulfur (S) antimony (Sb) selenium (Se)

How many valence electrons does lithium (Li) have available for bonding? 1 2 3 4

Which equation represents a neutralization reaction? A. 4Fe (s) + 3O2 (g) → 2Fe2O3 (s) B. 2H2 (g) + O2 (g) → 2H2O () C. HNO3 (aq) + KOH (aq) → KNO3 (aq) + H2O () D. AgNO3 (aq) + KCl (aq) → KNO3 (aq) + AgCl (s)

A student states the following: "Since acetone (nail polish remover) evaporate more readily than water, one would assume that acetone has weaker intermolecular forces than water." Evaluate their claim. (2 sentences)

A catalyst can only be used once. True False

On what basis do we distinguish between substances and separate them from one another?

What is the net ionic equation for the following reaction? H2CrO4 + Ba (OH) 2

How does improving food-storage facilities make farming more sustainable? A. It decreases the amount of water needed. B. It keeps food from rotting as quickly and being wasted. C. It decreases the amount of land needed. D.