What is a chemical change that occurs when burning a candle?

The insecticide DDT was introduced in the 1950s, and the rates of malaria dropped significantly. DDT was later found to be toxic to birds and other animals, and it was discontinued in 1964. As a result, rates of malaria began to rise.

The number of grams in 2.65 mol of SO2 is

What are blocks of time in the geological time scale called? a. centuries c. years b. eras d. days?

How is chemical energy useful? Give three examples.

What is the effect of day lenght in plant growth? dependent and independent

Which of the following is an element? a. carbon monoxide gas (co) b. magnesium chloride salt (mgcl) c. hydrochloric acid (hcl) d. zinc metal (zn)

Describe the formation of an aqueous KI solution when KI dissolves in water

Which the following countries founded their first permanent settlement in North America: England, the Netherlands, France, and Spain

Why does salt separated from a saltwater solution look different than the salt that dissolved in the water

Which of the compounds below is not an example of a molecular solid?