Answer:
If the answer helps you PLEASE mark me as brainliest
Stay Safe, Stay Happy And stay healthy
A beaker of black powder can be a mixture with different substances (i.e gunpowder: a mixture of sulfur, charcoal, etc.), an element which can probably be carbon (known as black), and a compound as well which can be potassium nitrate. Hence, the answer is D.
Answer:
Here
Explanation:
Chemists need the mole concept to bridge the gap between the microscopic world of atoms to the macroscopic world of humans. As you know, the molecular level consists of particles that are invisible to us.
It's b. calcium
because the outer electron structure in all of that element is similar, they have the same chemical and physical properties.<span />
OH- is the ion that increases the concentration of a base
