One molecule of bromine (Br2) and two molecules of potassium chloride (KCI) Combine in a reaction. How many Atoms are in the product?

Question

1. two.
2. four.
3. six.
4. three

Answer 1

The reaction between one molecule of bromine (Br2) and two molecules of potassium chloride (KCI) forms two products. The balanced equation for this reaction is:

Br2 + 2KCI -> 2KBr + Cl2

In this equation, the product is 2KBr. Each potassium bromide (KBr) molecule contains 3 atoms (1 potassium atom and 1 bromine atom), so the total number of atoms in the product is 2 molecules of KBr * 3 atoms/molecule = 6 atoms.

Thus, the correct answer is option 3. Six atoms are in the product.

Answer 2

2NaHCO3--Na2CO3 + CO2

Which of the following can be added to the products to balance the equation?
1. O2
2. H2O
3. CH2OH
4. H2

Answer 3

To balance the given equation, we can see that the number of hydrogen atoms (H) on the left side does not match the number on the right side. We can balance this by adding H2O to the products.

The balanced equation would then be:
2NaHCO3 → Na2CO3 + CO2 + H2O

Thus, the correct answer is option 2. H2O can be added to balance the equation.

Answer 4

Copper (CU) reacts with sulfur (S) to form copper sulfide. a scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction, in this reaction all the copper and all 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 5

The scientist used the Law of Conservation of Mass, which states that mass is neither created nor destroyed in a chemical reaction, to predict that the total mass of the copper sulfide product would be equal to the combined mass of copper and sulfur used in the reaction.