Which of the following is true about collision theory? 1.) It helps scientists make predictions about how fast chemical reactions occur among gases.
2.)It helps scientists make predictions about how fast chemical reactions occur among solids.
3.)It explains why dinosaurs became extinct.
4.)All the above statements are true.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)

What is the chemical formula for the compound formed between sodium and flour one

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures