Why are food preservatives added to food?

What are the spectator ions in the reaction:2koh (aq) + h2so4 (aq) 2h2o (l) + k2so4 (aq) ?

Is gold amalgamation a chemical reaction with gold and mercury?

What is the mass percentage of iodine (i2) in a solution containing 4.0*10-2 mol i2 in 140 g of ccl4?

I'm going into 8th grade, what is a good/fun science project I could do? This question may be under chemistry but the project could be under anything.

When thinking about genetic engineering in agriculture, which type of issue has the most direct consequences? economical issues political issues social issues environmental issues

What do you need in order to do a stoichiometric calculation? (Choose multiple) Balanced Chemical Equation Molar masses of compounds involved The type of reaction taking place Oxidation Numbers

The correct mathematical expression for finding the molar solubility (s) of sn (oh) 2 is:

18. which bond is most polar? H--F H--Cl H--Br H--I

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease