Physical and Chemical Changes; Law of Conservation of Mass

Front

Mixing baking soda and vinegar causes bubbles of carbon dioxide gas to form. Which of the following statements is true?

Back

A chemical change happened because a new gas was released

Front

Why would the total mass of the product(s) be less than the total mass of the reactant(s) after a chemical reaction?

Back

Gases were released into the air during the reaction

Front

A student mixed some food coloring into some water. Which of the following statements is true?

Back

No chemical change happened because no new substance formed.

Front

Plants create food by the process of photosynthesis. In this reaction, the plant starts with 6 atoms of carbon. How many atoms of carbon should be present after this reaction to conserve matter and keep the chemical reaction balanced?

Back

6 atoms of carbon

Front

Which of the following describes a chemical property? Conductivity, Malleability, Density, Reactivity with air

Back

Reactivity with air

Front

In any chemical reaction, the total amount of matter before the reaction and the total amount of matter after the reaction must STAY THE SAME according to: The Law of Equality, The Law of Conservation of Energy, The Law of Balance, The Law of Conservation of Mass

Back

The Law of Conservation of Mass

Front

What is a precipitate?

Back

A solid that can be formed by combining two liquids

Front

Which of the following shows ONE example of a physical change and ONE example of a chemical change?
- Dissolving powder and shredding paper
- Freezing water and burning coal
- Rusting iron and baking a cake
- Boiling water and melting wax

Back

Freezing water and burning coal

Front

CO₂ + H₂O ----> C₆H₁₂O₆ + O₂
What is wrong with the reaction above?

Back

It is not balanced properly

Front

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

Back

During a chemical reaction, the total amount of matter stays the same