What's the difference between a pure substance and an element

He approximate molar concentration of several chemicals are given. find the ph of each. use the calculator and round to the nearest tenth, if necessary. oven cleaner: [h+] = 10-13 ph = water: [h+] = 0.0000007 ph = blood: [h+] = 0.

True or False: The endocrine system prepares your body to deal with fear."

Which most likely indicates a chemical change has occurred? a solid substance becoming larger a solid melting and becoming a liquid a green liquid becoming a red liquid a liquid freezing and becoming a solid

In which layer of the atmosphere does the aurora borealis form

Give the full electron configuration for barium

List two non-SI units for volume, and explain how they relate to the cubic centimeter.

G which atomic orbitals overlap to form the carbon-carbon σ bonding molecular orbital of acetylene, c2h2?

Where did the earth hold most of its original water

Giovanni created this chart to study for an exam. A 2-column table titled common ionic compounds. The first column labeled compound has entries sodium hydroxide (N a O H), iron oxide (F e O), calcium chloride (C a C l subscript 2), calcium carbonate

Consider the two electron arrangements for neutral atoms A and B. What is the difference between atom A and atom B? A - 1s22s22p63s1 B - 1s22s22p65s1 Atom B has lost some inner electrons.