What protects earths surface

Why do scientists use a scaling factor of k when calculating sun spots

Which electrons are responsible for most chemical bonding? outer electron shell because these electrons can be readily exchanged with adjacent atoms innermost electron shell because the electrons can be transferred to the nucleus middle electron

Phosphorus has three electrons in its 3p sublevel and sulfur has four. Phosphorus should have the lower ionization energy but it does not, sulfur does. What does this provide evidence for? A. Aufbau's principle B. Conservation of energy C.

Explain how the processes in the water cycle work together to maintain a constant amount of water on Earth.

What does the enthalpy of reaction measure? O A. The amount of energy required to raise the temperature of a substance O B. The amount of energy required to make a chemical reaction happen O c.

The unit cell of amazonite is made of three pairs of faces, each pair different from the others. The faces are oriented at angles to one another that are not 90 degrees.

An aqueous solution at 25∘C has a hydronium ion concentration of 3.2*10-9 M. What is the hydroxide ion concentration of the solution? Write your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer.

What is the electron configuration of a sulfur atom in the ground state?

Unsaturated fatty acids are often classified according to the number of carbon atoms between the terminal methyl carbon (the omega carbon) and the closest double bond to the methyl end of the chain.

Suppose the average concentration of copper in water is measured to be 2.5 x 10" M. a. Express this concentration in mg/L. b. Express this concentration in ug/L. c.