What are the reactants in a chemical formula

Question

Responses:

the atoms after the chemical reaction, found on the right side of the equation
the atoms left over after the formation of the new substance

the atoms prior to the chemical reaction, found on the left side of the equation

the substance created by chemical change

Answer 1

The correct response is:

the atoms prior to the chemical reaction, found on the left side of the equation.

In a chemical equation, the reactants are the substances that undergo the chemical change, and they are typically listed on the left side of the equation.

Answer 2

What does the Law of Conservation of Mass say about a chemical reaction
Responses:

Mass increases as atoms are rearranged during a chemical reaction.

To balance a chemical equation, additional mass may be created.

In a chemical reaction, mass is neither created nor destroyed.

Mass is not measurable in a chemical reaction.

Answer 3

The correct response is:

In a chemical reaction, mass is neither created nor destroyed.

The Law of Conservation of Mass states that the total mass of reactants before a chemical reaction is equal to the total mass of products after the reaction, meaning that matter is not lost or gained, just transformed.

Answer 4

Which of the following molecules shows two atoms of hydrogen (H)
Responses:

HO2

2H2O

H2SO4

2CH4

Answer 5

The correct response is:

HO2

This molecule contains two atoms of hydrogen, as indicated by the subscript "2."

The others have different arrangements or numbers of hydrogen atoms:

• 2H2O has four hydrogen atoms (2 times 2).
• H2SO4 has two hydrogen atoms.
• 2CH4 has eight hydrogen atoms (2 times 4).

However, if the query is specifically looking for a molecule that indicates exactly two hydrogen atoms, none of the provided answers fits as clearly, since H2SO4 also contains two hydrogen atoms.

Ultimately, both HO2 and H2SO4 are correct answers depending on precise wording, but if required to choose the first option that shows the count without further multiplication or context, then HO2 is also correct. Please clarify if needed!

Answer 6

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:

219 amu

107 amu

73 amu

75 amu

Answer 7

To calculate the atomic mass of Fe(OH)₃, you need to sum the atomic masses of all the atoms in the molecule.

1. Iron (Fe): 1 atom × 56 amu = 56 amu
2. Oxygen (O): 3 atoms × 16 amu = 48 amu (because there are three hydroxide ions, OH, which each contain one oxygen)
3. Hydrogen (H): 3 atoms × 1 amu = 3 amu (again, from the three hydroxide ions)

Now, add them together:

\[ 56 , \text{amu (Fe)} + 48 , \text{amu (O)} + 3 , \text{amu (H)} = 107 , \text{amu} \]

So, the atomic mass of Fe(OH)₃ is 107 amu.