Sodium reacts with chlorine to form the compound sodium chloride, or salt. The chemical formula below shows how the two elements combine into a compound.

Question

2Na + Cl2 → 2NaCl

If the total mass of the reactants is 58.44 amu, what will be the total mass of the products?

(1 point)
Responses

29.22 amu
29.22 amu

60 amu
60 amu

58.44 amu
58.44 amu

116.88 amu

Answer 1

According to the law of conservation of mass, the total mass of the reactants must equal the total mass of the products in a chemical reaction. Since the total mass of the reactants is given as 58.44 amu, the total mass of the products must also be 58.44 amu.

Therefore, the correct response is:

58.44 amu

Answer 2

Which procedure could be used to demonstrate that matter is conserved during a physical change?(1 point)
Responses

Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.

Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.
Find the mass of a raw egg. Cook the egg. Find the mass of the cooked egg.

Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.
Find the mass of an apple. Cut the apple and remove the core. Find the mass of the remaining apple.

Find the mass of a cup of water. Boil the water. Find the mass of the water that remains.

Answer 3

The correct procedure to demonstrate that matter is conserved during a physical change is:

Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.

This procedure illustrates the conservation of mass because it involves a straightforward physical change (melting), where the total mass before and after the change should remain constant, assuming no matter is lost to the surroundings.

Answer 4

The image is a model of sulfuric acid that has a chemical formula of H2SO4. In 1-2 sentences, explain why creating models, like the one shown in the image above, is important in understanding substances.

Answer 5

Creating models, like that of sulfuric acid (H2SO4), is important for visualizing the molecular structure and arrangement of atoms within a substance, which helps in understanding its chemical behavior and properties. These models facilitate a better grasp of complex concepts such as molecular bonding, functional groups, and the physical interactions between molecules, contributing to a deeper comprehension of chemistry.

Answer 6

Use the chemical equation to complete the activity.

2Cu+S→Cu2S
2
Cu
+
S
→
Cu
2
S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.

Answer 7

The scientist used the law of conservation of mass to predict that the total mass of the products would equal the total mass of the reactants. Since the initial mass of copper (12.7 grams) and sulfur (3.2 grams) adds up to 15.9 grams, it follows that this would be the total mass of the copper sulfide (Cu2S) produced in the reaction.