What element is used to make the most widely used compound in the chemical industry?

What are most of the elements in the periodic table?

Which of the following is proof that a chemical reaction has occurred?

Which of the following is an example of a chemical reaction?

What is the source of activation energy that ignites a strike anywhere match?

Which of the following statements describes a chemical change?

Which of the following is NOT a sign of a chemical reaction?

What is the force that holds strong atoms together?

Which of the following states that law of conservation of mass?

Chemical reactions are

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