Why are gas bubbles not always a sign of a chemical change?

When heated, CaCO₃ decomposes into CaO and CO₂ according to the following equation: CaCO₃ (s) ⇌ CaO (s) + CO₂ (g) This is an endothermic reaction in which ∆H° = 178.3 kJ/mol and in which entropy increases, ∆S° = 159 J/mol･K.

Which electron configuration of the 4f energy sublevel is most stable? 4f^7 4f 4f^13 4f^14

Which statement is true about the ionic size of the elements in a group as one moves from top to bottom in that group? Ionic size does not vary in any predictable way within the group. Ionic size increases from top to bottom within the group.

What's the difference between the structure of table salt and table sugar?

Name 6 measurable properties of weather and climate

Water is unique because the density of it's solid is less than the density of it's liquid. Describe how life would be different if this weren't true

If an element has 1 valence electrons, how many dots will be in the elements dot diagram?

What is the temperature of a gas at STP?

What is the numerical meaning of centimeter

You run an experiment to test the effects of temperature on solubility. What would you heat? A.) solvent B.) solute C.) the room B.) the beaker