Common Assessment 3 Unit 5 Test- Mieszkuc

1. During a magical chemistry experiment, Hannah and Benjamin discovered that the law of conservation of mass states that (a)  

• Mass cannot be created nor destroye
• Mass can be lost during a chemical
• Mass can be gained during a chemica

Abigail and Rohan are exploring the world of chemistry and stumble upon a mysterious molecule. Can you help them figure out how many hydrogen atoms are in this molecule?

• 1

• 2

• 4

3. Scarlett and Mason are on a treasure hunt! Which element in the formula has the least number of atoms?

• Lithium (Li)

• Carbon (C)

• Oxygen (O)

4. Olivia and Jackson are in a chemistry lab, and they stumble upon a mysterious formula: H₂SO₄. Can you help them figure out the total number of atoms in this formula?

• 4

• 2

• 7

Match the following chemical reactions with the number of water molecules (H₂O) produced:

• CH₄ + 2O₂ → CO₂ + 2H₂O

• 3

• Fe₂O₃ + 3H₂SO₄ → Fe₂(SO₄)₃ + 3H₂O

• 2

• 2H₂ + O₂ → 2H₂O

• 4

Match the following terms with their correct definitions related to a chemical reaction.

• Smallest unit of a chemical element

• Products

• New compounds and substances formed after a reaction

• Atoms

• Basic substances that cannot be broken down further

• Elements

7. In a magical potion class, Anika and Jackson are learning about the mystical substances that react and transform during a spell. What are these substances called?

• Liquids

• Reactants

• Metals

8. Aiden and Ethan are in a science class, and their teacher asks them: Which of the following lists contains only examples of chemical changes?

• cutting vegetables, mowing the lawn, freezing water

• fireworks, baking a cake, digesting food

• cutting your hair, burning paper, melting ice cream

David and Aria are conducting a fun science experiment! They want to find out which image shows mass being conserved. The image that shows mass being conserved is (a)  

• A
• B
• D

Evelyn and Aiden are conducting a science experiment. When they mix water with hydrochloric acid, it produces a lot of heat and bubbles. This exciting reaction is best described as a (a)   reaction.

• Chemical
• Physical