Balancing Reactions

Which of the following is an example of a physical change?

• Burning

• Melting

• Rusting

• Decomposing

What is the process by which the atoms of one or more substances are rearranged to form different substances called?

• Physical change

• Chemical reaction

• Chemical change

• State change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the symbol (aq) represent in a chemical equation?

• Solid

• Gas

• Aqueous (dissolved in water)

• Liquid

What is the purpose of coefficients in a chemical equation?

• To represent the state of matter of each substance

• To separate one or more reactants or products

• To balance the number of each atom in the reaction

• To indicate the number of each substance needed

Which of the following is a sign that a chemical change has occurred?

• Change in shape

• Change in size

• Change in texture

• Release of light

Tags

NGSS.MS-PS1-2

What is the Law of Conservation of Mass?

• Matter can neither be created or destroyed, it can only change forms

• Matter can only be destroyed

• Matter can only change forms

• Matter can be created or destroyed

Tags

NGSS.MS-PS1-5

What does the symbol (s) represent in a chemical equation?

• Liquid

• Gas

• Solid

• Aqueous (dissolved in water)

What is the purpose of the subscripts in a chemical equation?

• To represent the state of matter of each substance

• To separate one or more reactants or products

• To balance the number of each atom in the reaction

• To indicate the number of each substance needed

Tags

NGSS.MS-PS1-5

What is the purpose of the + symbol in a chemical equation?

• To balance the number of each atom in the reaction

• To separate one or more reactants or products

• To represent the state of matter of each substance

• To indicate the number of each substance needed

What is the purpose of the 🡪 symbol in a chemical equation?

• To represent the state of matter of each substance

• To separate one or more reactants or products

• To indicate the number of each substance needed

• To balance the number of each atom in the reaction