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What are the reactants in a chemical formula?

The substance created by a chemical change

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

The items after the chemical reaction, found on the right side of the equation

The items left over after the formation of the new substance

7 answers

The items 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?

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

Mass increases as items are rearrange during a chemical reaction.

Mass is not measurable in a chemical reaction.

In a chemical reaction, mass is neither created nor destroyed.
In a chemical reaction, mass is neither created nor destroyed.
Which of the following molecules shows two atoms of hydrogen (H)?

H2SO4

HO2

2CH4

2H2O
The correct answer is 2H2O.
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?

73 amu

107 amu

219 amu

75 amu
To determine the atomic mass of Fe(OH)3, we need to add the atomic masses of all the atoms present in the molecule.

One Fe atom has a mass of 56 amu.
Three O atoms have a total mass of 3 × 16 amu = 48 amu.
Three H atoms have a total mass of 3 × 1 amu = 3 amu.

Adding these masses together gives us:
56 amu + 48 amu + 3 amu = 107 amu.

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