Matter and its interactions

What happened to the weight in the open system after the reaction? Why?

Why did the weight stay the same in the closed system?

Which investigations showed signs of a chemical change? What indicators were present?

Why is dissolving salt in water considered a physical change?

Which material was the best insulator?

Why did the metal container cool down faster than the Styrofoam?

What happens to the particles in the balloon when it’s placed in the freezer?

How does heat affect the balloon’s size when it’s placed in the sun?

Why is melting ice a reversible change?

What makes rusting an irreversible change?