Balancing Chemical Equations

Front

What idea would improve the design of an experiment to more accurately demonstrate the Law of Conservation of Mass in a reaction between hydrochloric acid (HCl) and magnesium (Mg)?

Back

Students should put a balloon over the top of the flask to close the system.

Tags

7-PS1-5

Front

How does the concept of the Law of the Conservation of Mass apply to chemical reactions?

Back

The reactants and products have exactly the same atoms.

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7-PS1-5

Front

The picture shows steps in the reaction of fireworks burning. Which statement about the reaction is true?

Back

Atoms were rearranged, but no matter was created or destroyed in the reaction.

Front

What does the arrow represent in a chemical equation?

Back

yields

Front

According to the equation for cellular respiration, what are the products?

Back

carbon dioxide, water, and energy

Tags

7-PS1-5

Front

A balanced chemical equation is shown in the image. How many total atoms are found on each side of the arrow?

Back

8

Front

Why is it important to balance chemical equations?

Back

Balanced equations follow the Law of Conservation of Matter which represents what actually happens in nature.

Tags

7-PS1-5

Front

What composes the compound with the chemical formula HNO₃?

Back

1 hydrogen atom, 1 nitrogen atom, and 3 oxygen atoms

Tags

7-PS1-5

Front

Which equation is correctly balanced for hydrogen and oxygen reacting to form water?

H₂ + O₂ --> H₂O

,

2H₂ + O₂ --> 2H₂O

,

4H + O₂ --> 2H₂O

,

H₂ + O --> H₂O

Back

2H₂ + O₂ --> 2H₂O

Tags

7-PS1-5

Front

Reactants of the chemical equation: CH₄ and O₂, CO₂ and H₂O, CH₄ and CO₂, O₂ and H₂O

Back

CH₄ and O₂

Tags

7-PS1-5