The statement that best describes waves is B. Waves cannot propagate without a medium
<h3><u>Answer;</u></h3>
Lightening
<h3><u>Explanation;</u></h3>
- Static electricity occurs when there is an imbalance of positively and negatively charged atoms. Electrons then jump from atom to atom, releasing energy.
- Lightening occurs as a result of a build up of electric charge in a cloud. It occurs when negative charges jump from a cloud to the ground.
- The result of electrons moving from one place to another and cause a buildup of separated positive and negative charges creates a static charge.
Answer:
SiBr₄= 347.7 g/mol
Explanation:
Gram formula mass:
Gram formula mass is the atomic mass of one mole of any substance.
It can be calculated by adding the mass of each atoms present in substance.
SiBr₄:
Atomic mass of Si = 28.1 amu
Atomic mas of Br = 79.9 amu
There are four atoms of Br = 79.9 ×4
There is one atom of Si = 28.1 × 1
Gram formula mass of SiBr₄:
SiBr₄ = 79.9 ×4 + 28.1 × 1
SiBr₄= 319.6 + 28.1
SiBr₄= 347.7 g/mol
The study of the Cryosphere is called:
Cryology
I hope this helps! :)