Hydrogen peroxide breaks down to form water and oxygen gas. When this reaction occurred, the following observations were made:I. The mass of the solution remains the same. II. Phase changes are observed. III. The color of the solution remains clear. IV. The temperature of the solution increases. Which observation is evidence that a chemical change has occurred?

If you could have one clothing item of your choice, but it was in either of these colors, which would you choose out of each category? blue or pink red or yellow red or green green or purple blue or green

The sun a. will become a red giant within two to three million years b. is in its main sequence, which willlast thousands of years c. is in its main sequence, which will last billions of years. d. will explode as a supernova after its main sequence

How does federalist, no.10 address the concerns of a strong national government in brutus i? a) the court system would be a representative democracy and the other branches republics. b) representative gov't was the only way to check state power in the national gov't. c) states would be allowed to choose which sort of representation they have at the national level d) the national gov't would be a balance between democracy and republic, thus protecting the rights of citizens.