The diagram shows Niels Bohr's model of an atom.

What happens when the electron moves from the first energy level to the second energy level?

Which is a characteristic of a mixture? It can only be separated using electricity. Its components retain their properties. It is the result of a chemical a reaction.

What are index fossils used to determine? the age of the other fossils in the rock layer the age of the surrounding rock layer the minerals within fossils in the rock layer the minerals within the surrounding rock layer

Which of these are a body fossil A. dinosaur nest B. shrimp burrow C. leaf imprint D. claw print

Which statement best describes an index fossil? A. a fossil that can be used to establish the absolute age of a rock layer B. a fossil which is formed in a soft sediment by the movement of an animal C. a fossil of an insect captured in amber D.

1.) C6H12O6 (aq) is a (an) ? A. Ion in solution B. Dilute solution C. Ion in a crystal D. Dissolved Molecule 2.) 2.60 moles of LiCl is dissolved in 230. mL of water. What is the resulting molarity? (Hint: Change unit mL to L before you divide.) A. 2.

What is meant by "pressure of the atmosphere?" What causes this pressure?

A substance is analyzed and found to contain 85.7% carbon and 14.3% hydrogen by weight. A gaseous sample of the substance is found to have a density of 1.87 g/L, and 1 mol of it occupies a volume of 22.4 L.

Which property of a mineral sample does not influence how quickly it settles in water? 1) density 2) hardness 3) shape 4) size

Dinitrogen difluoride gas is collected at in an evacuated flask with a measured volume of. When all the gas has been collected, the pressure in the flask is measured to be.

How is the mass number of an isotope expressed in the name of an atom?