When the powder of a common metal is heated in an open china dish, its color turns black however when hydrogen I sassed over hot black substance so formed, it regains its original color based on the given information answer the following question a)what type of chemical reaction takes place in each of the two given steps? write a balanced chemical reaction for both in the reaction.
b)name the metal initially taken in the powdered form

Which of the following statements is true? question 4 options: nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction. both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17