Which of the following did Mendeleev not believe in because he could not see them?

Mixtures

Atoms

Elements

Compounds

0.25 mole of O2 will contain the same number of molecules as 0.25 mole of NH3. true or false?

2h is a loosely bound isotope of hydrogen, called deuterium or heavy hydrogen. it is stable but relatively rare - it form only 0.015% of natural hydrogen.

In an atom where is the electon located?

Scientists often have to deal with numbers that are either very large or very small. For example, the radius of the Sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 * 10-4 millimeters.

Atoms A and X are fictional atoms. Suppose that the standard potential for the reduction of X^2 + is + 0.51 V, and the standard potential for the reduction of A^2 + is - 0.33.

Does pressure decrease when a gas is removed

This is the ability of matter to change into a different substance.

How can I write ecology in my own words for a definition

The amount of time it takes for one-half of the original amount of an isotope to decay is known as its

If enough heat is added to a substance, electrons begin to separate from the atomic nuclei. Which process does this describe? A. A solid turning into a liquid B. A plasma turning into a gas C. A gas turning into a plasma D.