Chemistry Quiz
20 questions · no time limit
0:00
MATTER AND ITS INTERACTIONS
Question 1 of 20
No time limit
Current
Answered
Flagged
Not seen
A student adds a small amount of steel wool to a test tube containing 10 mL of copper(II) sulfate solution (blue). The test tube is left undisturbed for 20 minutes. Observations/data: - Blue solution becomes lighter blue over time - A reddish-brown coating forms on the steel wool - Some dark particles fall to the bottom - No bubbling observed - Temperature remains about 22∘C22^\circ\text{C} Did a chemical reaction occur? Choose the best CER justification.
YOUR PROGRESS
20
QUESTIONS
Ready when you are
Answer in any order. Your progress shows here as you go.
QUESTIONS
KEYBOARD
Pick an answer ABCD
Next question ↵→
Previous ←
Flag for review F
Answers save as you go · flagged questions come back at the end