All the following are signs of a chemical reaction, except

A. a change in color or odor.

B. a release of gas.

C. a change of state.

D. a change in energy.

Which reaction is a decomposition reaction? A. 2KClO3 → 2KCl + 3O2 B. 4Na + O2 → 2Na2O C. ZnS + 3O2 → 2ZnO + 2SO2 D. 2NaBr + CaF2 → 2NaF + CaBr2

If the solubility of KCl in 100 mL of H₂O is 34 g at 20 °C and 43 g at 50 °C, label each of the following solutions as unsaturated, saturated, or supersaturated.

How many grams of Na3AsO3 is produced from the reaction of 6.90 moles of NaOH?

Pretend I took some softened butter and popcorn kernels, mixed them together, and placed them in the freezer. The teacher has taken soft heated butter and popcorn kernels, mixed them together, and placed them in the freezer to harden.

How many grams of lithium are in 17.0 grams of lithium Sulfide

Make inferences about what you think would happen to other living things, such as plants and animals, in an area exposed to nuclear radiation.

What are the three particles of an atom

Which of these are the largest? asteroids, comets, meteors, or are they all the same size?

A) the ka for acetic acid (h3cco2h) is 1.737 * 10-5. what is the pka for this acid? b. use the pka calculated above to determine the ph at which [h3cco2h]=[h3cco2-].

Suppose you take a piece of hard wax from an unlit candle. After you roll the wax between your fingers for a while, it becomes soft. What State of matter is the softer wax? Is it possible for wax to change without changing state