Question

3 who first formulated the law of conservation of matter?
a isaac newton
b albert einstein
c antoine lavoisier
d marie curie

4 what did lavoisier’s experiments demonstrate about mass during chemical reactions?
a mass can be lost.
b mass can be gained.
c mass remains constant
d mass is irrelevant.

5 when ice melts into water, what change occurs according to the law of conservation of matter?
a the ice disappears completely.
b the molecules change state but remain present
c the water gains mass
d the water loses energy

6 how does the law of conservation of matter contribute to our understanding of chemical reactions?
a it shows that reactions create matter.
b it indicates that reactions change the mass of substances.
c it emphasizes the rearrangement of atoms rather than their creation or destruction
d it states that matter can be lost during reactions

7 which of the following models of a chemical reaction best represents the law of conservation of matter?
a reaction i
b reaction ii
c reaction iii
d reaction iv
(chart with reactants and products for each reaction)

Explanation:

1. Antoine Lavoisier is known as the founder of modern chemistry and first formulated the Law of Conservation of Matter.
2. Lavoisier's experiments proved that the total mass of reactants equals the total mass of products in chemical reactions, so mass stays constant.
3. The Law of Conservation of Matter states matter is not created or destroyed; when ice melts, it only changes state from solid to liquid, and its molecules remain present.
4. The law explains that chemical reactions only rearrange atoms, no new atoms are created or existing ones destroyed.
5. Reaction IV has the same number and type of atoms in reactants and products, which matches the Law of Conservation of Matter (atoms are just rearranged, no net gain/loss).

Answer:

1. c. Antoine Lavoisier
2. c. Mass remains constant
3. b. The molecules change state but remain present
4. c. It emphasizes the rearrangement of atoms rather than their creation or destruction
5. d. Reaction IV