Understanding Chemical Equations

Chemical equations use (a)   to summarize a reaction.

• Words
• Chemical formulas and symbols
• Pictures
• Numbers

Tags

NGSS.MS-PS1-1

Reactants are the substances that are (a)   .

• reacting.
• produced.
• inert.
• catalysts.

Products are the substances that form after a (a)   occurs.

• reaction.
• mixture.
• solution.
• evaporation.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction must show (a)   on both sides of the equation.

• The same number of atoms of each el
• Different compounds
• The same temperature
• Different elements

Tags

NGSS.MS-PS1-5

The first step in balancing chemical equations is (a)  

• Identify the reactants and products
• Count the number of atoms of each e
• Add coefficients to balance the equ
• Check the balance of the equation

Which of the following is a step in balancing chemical equations? (CHOOSE 2)

• Write the Equation

• Ignore the Atoms

• Use Coefficients to Balance Atoms

• Change the Elements

What should you do after using coefficients to balance atoms in a chemical equation?

• Check if the equation is balanced by counting atoms of each element.

• Add more coefficients to make the equation more complex.

• Remove all coefficients to simplify the equation.

• Change the chemical formulas to balance the equation.

The chemical reaction represented by the equation 2 H₂ + O₂ → 2 H₂O is an example of a (a)   reaction.

• Synthesis
• Decomposition
• Replacement

The chemical reaction represented by the equation: 2 NH₃ → 3 H₂ + N₂ is an example of a (a)   reaction.

• Synthesis
• Decomposition
• Replacement

The chemical reaction represented by the equation: 2 NaBr + CaF₂ → 2 NaF + CaBr₂ is an example of a (a)   reaction.

• Synthesis
• Decomposition
• Replacement