What constitutes only 16% of earth's volume but 32% of earth's mass

Na: 1s22sC2pP3s C= D= E=

Water quality standards are set by ___, in accordance with the ___ act. A. State government; clean environment B. Clean water association; water quality C. The federal government; environment protection D. The EPA; clean water

A Japanese sword maker heats a mixture of iron and charcoal. He repeatedly heats, folds, and flattens the mixture more than a thousand times. What is he doing? a. He is making a metallic bond and adding impurities. b.

How many mL of 1.00M HCl are needed to neutralize 400mL of 0.200M NaOH?

In science, a testable prediction to explain observations is known as a (n)

Which phrase describes an atom

How many moles of NH3 are in 0.250 L of a 5.00 M aqueous solution?

There are different types of bonds based on electronegativity. One bond type is known as non-polar covalent. Which choice below has this bond type? A. all of the compounds B. H2 C. H2O D. NaCl

What normally determines whether a substance is a liquid, solid, gas, or plasma?

Which atoms from an ionic bond