Which ones of they statements our true? And which ones are false?
I. Coefficients can be fractions.
II. Subscripts can be fractions.
III. Coefficients represent the relative masses of the reactants and/or products.
IV. Changing the subscripts to balance an equation can only be done once.
V. Atoms are conserved when balancing chemical equations.
I don't like T/F questions anytime but these are poor.
1. May be T or F depending upon the circumstances.
2. They CAN be but fractional subscript are not allowed.
3. no
4. May not be done even once.
5. yes.
In the future, you should tell us if you think the statement is T or F AND WHY YOU THINK THAT WAY. Remember you can guess and get half of them right if you answer enough T/F questions.
I. True - Coefficients can be fractions. In a balanced chemical equation, coefficients indicate the ratio of molecules or moles of each substance involved. These coefficients can be whole numbers or fractions to accurately represent the stoichiometry of the reaction.
II. False - Subscripts cannot be fractions. Subscripts in a chemical formula represent the number of atoms of each element in a molecule and are always whole numbers. Fractions are not used as subscripts in chemical formulas.
III. True - Coefficients represent the relative masses of the reactants and/or products. The coefficients in a balanced chemical equation provide the molar ratio between substances involved in a chemical reaction. This ratio can be used to determine the relative masses of the reactants and products.
IV. False - Changing the subscripts to balance an equation can be done more than once. Balancing a chemical equation often requires adjusting both coefficients and subscripts. While changing subscripts might change the identity of a compound, it is still a valid step in balancing the equation.
V. True - Atoms are conserved when balancing chemical equations. The Law of Conservation of Mass states that atoms cannot be created or destroyed during a chemical reaction, only rearranged. Balancing a chemical equation ensures that the same number and type of atoms are present on both sides of the equation, thus conserving atoms.
To determine which statements are true and false, we can analyze each statement one by one:
I. Coefficients can be fractions.
This statement is true. Coefficients in a chemical equation represent the relative ratio of molecules or moles involved. Hence, they can be whole numbers or fractions.
II. Subscripts can be fractions.
This statement is false. Subscripts in a chemical formula represent the number of atoms of each element in a molecule, and they must always be whole numbers. Fractions cannot be used as subscripts in chemical formulas.
III. Coefficients represent the relative masses of the reactants and/or products.
This statement is false. Coefficients in a chemical equation represent the relative ratio of molecules or moles, not the masses. To determine the masses, you would need to know the molecular weights of the substances involved.
IV. Changing the subscripts to balance an equation can only be done once.
This statement is true. When balancing a chemical equation, you can change the coefficients to balance the number of atoms on each side of the equation. However, changing subscripts would imply a different compound altogether.
V. Atoms are conserved when balancing chemical equations.
This statement is true. The law of conservation of mass states that atoms are neither created nor destroyed in a chemical reaction. Balancing a chemical equation ensures that the number of atoms of each element is the same on both sides of the equation.
In summary, the true statements are: I. Coefficients can be fractions. IV. Changing the subscripts to balance an equation can only be done once. V. Atoms are conserved when balancing chemical equations.
The false statements are: II. Subscripts can be fractions. III. Coefficients represent the relative masses of the reactants and/or products.