Mass In, Mass Out – Chemistry Check-Up

1. In a closed system, mass can be lost during a chemical reaction.

• true

• false

1. A gas being produced is one sign that a chemical reaction has occurred.

• true

• false

1. Hey there, science explorers! 🌟 Did you know that the Law of Conservation of Mass tells us that matter is like a magic trick? It can’t be created or destroyed, only transformed! What do you think, is this magic true or false? Let’s see if you can help William, Abigail, and Samuel figure it out!

• true

• false

When sugar dissolves in water, it is a chemical reaction.

• true

• false

1. The appearance of a precipitate indicates a physical change.

• true

• false

6. Which of the following supports the Law of Conservation of Mass?

• 6. Iron rusting in an open beaker loses mass

• 6. Water evaporating from a bowl

• 6. Burning wood loses mass

• 6. Mass of reactants equals mass of products in a sealed flask

6. Hey there, science explorers! 🌟 What is a sign that a chemical reaction has taken place? Let's help Mason, Abigail, and Maya figure it out!

• melting ice

• boiling water

• color change

• breaking glass

6. During a thrilling chemistry experiment, Anika, Ethan, and Mia are trying to figure out the best way to measure the mass of a reaction that produces a gas. Which setup do you think will help them get the most accurate measurement?

• open beaker

• plastic cup

• closed container

• petri dish

6. When Nora and Daniel mixed two clear solutions in their science lab, they were surprised to see a white solid forming! What is this fascinating phenomenon an example of?

• melting

• precipitation

• condensation

• freezing

6. During a wild chemistry experiment, Aria noticed something strange: the mass of her reaction seemed to change! What could be the best explanation for this mysterious phenomenon?

• atoms disappeared

• a gas escaped

• new atoms formed

• the balance broke