Question

1. explain what is meant by the conservation of mass and how it is useful to scientists studying chemical reactions. 5. design a concept map that compares and contrasts how early greek philosophers and how democritus, aristotle, and dalton viewed matter.

Explanation:

4.

The conservation of mass states that in a closed - system, the total mass remains constant during a chemical reaction. Atoms are neither created nor destroyed, only rearranged. This is useful for scientists as it allows them to balance chemical equations, predict the amounts of reactants needed and products formed, and understand the stoichiometry of reactions.

Early Greek philosophers had various views on matter. Democritus proposed the existence of atoms as indivisible particles. Aristotle believed in the four - element theory (earth, air, fire, water) and did not support the atomic idea. Dalton's atomic theory in the 19th century stated that elements are made of atoms, atoms of the same element are identical, and atoms combine in simple whole - number ratios to form compounds. A concept map could have a central node 'Views on Matter' with branches for each thinker. For Democritus, branches could include 'atom concept', 'indivisible particles'. For Aristotle, 'four - element theory', 'no atom belief'. For Dalton, 'atomic theory', 'identical atoms of an element', 'whole - number ratios in compounds'.

Answer:

The conservation of mass means that in a closed - system, the total mass before and after a chemical reaction is the same because atoms are conserved. It helps scientists balance equations, predict reactant and product amounts, and understand reaction stoichiometry.

5.