Question
A) What does the Law of Conservation of Mass state? (1 point)
The total mass of reactants prior to a chemical reaction is greater than the mass of the product
due to the release of energy.
The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all
the products after the reaction.
Matter cannot be rearranged during a chemical reaction.
Matter is neither created or destroyed in a chemical reaction, only rearranged.
A) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction,
the mass will be __. (1 point)
30 grams
32 grams
28 grams
0 grams
The total mass of reactants prior to a chemical reaction is greater than the mass of the product
due to the release of energy.
The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all
the products after the reaction.
Matter cannot be rearranged during a chemical reaction.
Matter is neither created or destroyed in a chemical reaction, only rearranged.
A) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction,
the mass will be __. (1 point)
30 grams
32 grams
28 grams
0 grams
Answers
Answer
A) 78 g of potassium (K) react with 71 g of chlorine (Cl) to produce potassium chloride.
According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?
(1 point)
2 g
4 g
156 g
149 g
A) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of
Conservation of Mass, how many grams of potassium oxide (K2O) will be produced? (1 point)
2 grams
10 grams
5 grams
7 grams
According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?
(1 point)
2 g
4 g
156 g
149 g
A) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of
Conservation of Mass, how many grams of potassium oxide (K2O) will be produced? (1 point)
2 grams
10 grams
5 grams
7 grams
Answered by
GPT-4o mini
A) The correct statement about the Law of Conservation of Mass is: **The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.**
B) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be **30 grams.**
B) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be **30 grams.**
Answered by
GPT-4o mini
A) According to the Law of Conservation of Mass, the mass of the products must equal the total mass of the reactants. Therefore, if 78 g of potassium (K) reacts with 71 g of chlorine (Cl), the total mass of the products (potassium chloride, KCl) will be:
\[
78 \, \text{g} + 71 \, \text{g} = 149 \, \text{g}
\]
So, the mass of the product (2KCl) is **149 g.**
B) Again, according to the Law of Conservation of Mass, the mass of the reactants will equal the mass of the products. If 2 grams of potassium (K) reacts with 5 grams of oxygen (O), the total mass before the reaction is:
\[
2 \, \text{g} + 5 \, \text{g} = 7 \, \text{g}
\]
Thus, the mass of the potassium oxide (K2O) produced will be **7 grams.**
\[
78 \, \text{g} + 71 \, \text{g} = 149 \, \text{g}
\]
So, the mass of the product (2KCl) is **149 g.**
B) Again, according to the Law of Conservation of Mass, the mass of the reactants will equal the mass of the products. If 2 grams of potassium (K) reacts with 5 grams of oxygen (O), the total mass before the reaction is:
\[
2 \, \text{g} + 5 \, \text{g} = 7 \, \text{g}
\]
Thus, the mass of the potassium oxide (K2O) produced will be **7 grams.**
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