Conservation of Mass and Chemical Equations

Explain the conservation of mass and how to write balanced chemical equations to show how the atoms of reactants in a chemical reaction are rearranged to form products.

• The conservation of mass states that mass is neither created nor destroyed in a chemical reaction, and balanced chemical equations show the rearrangement of atoms from reactants to products.

• The conservation of mass states that mass is created in a chemical reaction, and balanced chemical equations show the destruction of atoms from reactants to products.

• The conservation of mass states that mass is destroyed in a chemical reaction, and balanced chemical equations show the creation of atoms from reactants to products.

• The conservation of mass states that mass is neither created nor destroyed in a chemical reaction, and balanced chemical equations show the creation of new atoms.

What is a chemical formula?

• A representation of a substance using symbols for its constituent elements

• A type of chemical reaction

• A method for measuring chemical quantities

• A process for creating new compounds

What is a word equation?

• A mathematical equation using words instead of numbers

• A chemical equation using words instead of chemical symbols

• A type of equation used in linguistics

• A word puzzle

What is a balanced symbol equation?

• A chemical equation with equal numbers of each type of atom on both sides

• A mathematical equation with equal values on both sides

• An equation that represents a balanced diet

• A financial statement showing balanced accounts

A coefficient in chemistry is:

• a number that appears in front of a chemical formula in a balanced chemical equation

• a symbol representing an element

• a measure of the concentration of a solution

• a type of chemical bond

A _______ represents a substance using element symbols and the number / ratio of atoms of each element in the substance.

• chemical formula

• chemical equation

• chemical reaction

• chemical bond

A _______ is a way of describing a reaction using the chemical names of the reactants and products.

• word equation

• chemical formula

• reaction diagram

• molecular structure

A _______ describes a reaction using a symbol equation with coefficients, which ensure there are equal numbers of atoms of each element on both sides of the symbol equation.

• balanced symbol equation

• unbalanced symbol equation

• chemical formula

• reaction diagram

A _______ is the number placed in front of a chemical formula to balance an equation; it multiplies all the atoms in the formula and shows the ratio of substances in a reaction.

• coefficient

• subscript

• molecule

• element

Explain the concept of conservation of mass.

• The mass of an isolated system remains constant over time.

• Mass can be created or destroyed in a chemical reaction.

• Mass is always conserved in open systems.