What is the most basic building block of matter?

Question 2 options:

the atom

the quark

the electron

the proton

Why can't chemical changes be reversed? Explain your answer by giving an example.

How do the mass and height of an object affect the gravitational potential energy?

A fountain pen, which has a total volume of 2.4 cm is half full with ink at ground level where the pressure is 780.0 mm Hg. It is put into the pocket of a pilot who flies to an altitude where the pressure is 520.0 mm Hg.

How many total atoms are in 0.210 g of P2O5?

Compared to the ideal angle, you would expect the actual angle between the bromine-oxygen bonds to be

Lithium reacts with lead (ll) phosphate in a single replacement reaction. How many grams of lithium phosphate are produced from 4.22 mol of lithium?

What term refers to how fast blood traveled from it source

A sample contains 430 mg of mercury. How many significant figures are in the number?

What is the percent composition of K2O?

Name two liquids that were acidic and their approximate pH's. Name two that were basic and their approximate pH's. 4. What were the most neutral 2 or 3 liquids? 5.