What does the Law of Conservation of Mass say about a chemical reaction?
A) Mass increases as atoms are rearranged during a chemical reaction.
B) To balance a chemical equation, additional mass may be created.
C) Mass is not measurable in a chemical reaction.
D) In a chemical reaction, mass is neither created nor destroyed.
From the Periodic table, it can be determined that iron (Fe) has an atomic mass of 56 amu, oxygen (O) has an atomic mass of 16 amu, and hydrogen (H) has a mass of 1 amu. What would the atomic mass of Fe(OH)3 be?
A) 107 amu
B) 73 amu
C) 75 amu
D) 219 amu
Chemical Reactions Quick Check:
What are the reactants in a chemical formula?
**the atoms prior to the chemical reaction, found on the left side of the equation
What does the Law of Conservation of Mass say about a chemical reaction?
**In a chemical reaction, mass is neither created nor destroyed.
Which of the following molecules shows two atoms of hydrogen (H)?
Responses
**H2SO4
From the Periodic table, it can be determined that iron (Fe) has an atomic mass of 56 amu, oxygen (O) has an atomic mass of 16 amu, and hydrogen (H) has a mass of 1 amu. What would the atomic mass of Fe(OH)3 be?
Responses
**107 amu
for question 1 it is answer D, or "in a chemical reaction, mass is neither created nor destroyed." and for question 2 it is answer A, or 107 amu
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connexus geek all correct!
The correct answer for the first question is:
D) In a chemical reaction, mass is neither created nor destroyed.
The Law of Conservation of Mass states that in a closed system, the mass of the reactants must be equal to the mass of the products in a chemical reaction. This means that atoms are neither created nor destroyed during a chemical reaction, but are rather rearranged. Therefore, the total mass before the reaction must be equal to the total mass after the reaction.
As for the second question, to find the atomic mass of Fe(OH)3, you need to calculate the sum of the atomic masses of all the atoms in the chemical formula.
Fe(OH)3 consists of one iron atom (Fe), three hydroxide ions (OH-), which consist of one oxygen atom (O) and one hydrogen atom (H).
The atomic mass of Fe is 56 amu (atomic mass units), the atomic mass of O is 16 amu, and the atomic mass of H is 1 amu.
So, the atomic mass of Fe(OH)3 can be calculated as follows:
1 atom of Fe * 56 amu = 56 amu
3 atoms of O * 16 amu = 48 amu
3 atoms of H * 1 amu = 3 amu
Adding these together:
56 amu + 48 amu + 3 amu = 107 amu
Therefore, the atomic mass of Fe(OH)3 is 107 amu.
Hence, the correct answer for the second question is:
A) 107 amu.