Chemical Reactions

What fundamental process occurs during a chemical reaction?

• Atoms are created or destroyed

• Substances change states without altering their chemical composition

• Chemical bonds are broken, formed, or rearranged to create different substances

• Elements are transformed into entirely new elements

In the photosynthesis reaction, which substances are considered the reactants?

• Glucose and Oxygen

• Carbon dioxide and Glucose

• Water and Oxygen

• Carbon dioxide and Water

Which of the following are the Reactants of the chemical reaction:

CH₄ + Cl₂ --> CH₃Cl + HCl

• CH₃Cl and HCl

• CH₄ and Cl₂

• H₂O and Cl₂

• CH₄ and CH₃Cl

What are the products?

CH₄ + Cl₂ --> CH₃Cl + HCl

• CH₃Cl and HCl

• CH₄ and Cl₂

• H₂O and HCl

• CH₄ and CH₃Cl

Which of the following is a chemical reaction

• H₂O

• 2H₂O --> 2H₂ + O₂

• CH₄

• C₆H₁₂O₆

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What principle dictates that the total amount of matter remains constant during a chemical reaction?

• Law of Thermodynamics

• Law of Conservation of Energy

• Law of Conservation of Matter

• Law of Chemical Equilibrium

What do the coefficients in a balanced chemical equation represent?

• The number of atoms of each element in a molecule

• The total mass of each reactant and product

• The number of molecules of each reactant and product

• The energy released or absorbed during the reaction