Why does a closed system mean that nothing could enter or exit

A man heats a balloon in the oven. If the balloon initially has a volume of 2.0 L and a temperature of 293K, what will the final temperature of the balloon be after he heats it and has a final volume of 10.0L?

How many kilograms of ice at a temperature of - 10.9 ∘C must be dropped in the water to make the final temperature of the system 27.2 ∘C?

What is heat energy?

Identify the most and the least acidic compound in each of the following sets. Leave the remaining answer in each set blank.

Why is lewis electron-dot diagrams more suitable than electron-shell diagrams illustrating chemical bonds

A laboratory experiment requires 250 millimeters of water for boiling. It also requires 100 millimeters of water for a cooling process.

Which set of procedures and observations indicates a chemical change? A) Ethanol is added to an empty beaker and the ethanol eventually disappears. B) A solid is gently heated in a crucible and the solid slowly turns to liquid.

If 100 grams citric acid react with 100 g baking soda how many grams of carbon dioxide?

What state of matter undergoes changes in volume most easily? a. solidb. liquidc. gasd. frozen

What was the result of the atomic theory?