Which of the following definitions characterizes an element?
Question 2 options:
A) contains a basic combination of two or more substance
B) contains only one type of atom
C) can only be broken down by chemical means
D)can be separated through physical means

Non renewable resources like petroleum eventually

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.