Which is a sign of chemical change?

A. chocolate syrup dissolve in milk

B. folding paper changes the size

C. toast smells different than bread

Earth's axis is tilted. Tell what would happen if it was vertical instead.

Compare and contrast the Bohr model of the atom with the modern model of the atom. What observations does the modern model explain that the Bohr model did not?

The hydrogen gas from the reaction of 1.0 g of iron with excess hydrochloric acid is collected in a 15.0 L flask at 25 degrees Celsius. What is the pressure of the hydrogen gas in this flask?

How do kidneys work with other body systems to maintain homeostasis?

Study the ion that contain the element chlorine. What are some similarities between the formulas for these ions

Around 1910, Rutherford bombarded gold foil with alpha particles. Most of the alpha particles passed straight through. To his surprise, a smaller number were deflected by 180°. This summary recounts the scientific discovery of A.

What is the density? Mass = 120 g Volume = 96 mL

A spoonful of salt is stirred into a pot of water. The salt is a

What are some catchy projects titles for the question, "What liquids cause the most tooth decay?"

Show that the speed of an electron in the nth bohr orbit of hydrogen is αc/n, where α is the fine structure constant. what would be the speed in a hydrogen-like atom with a nuclear charge of ze?