16 protons
Explanation: S2-: proton number 16; nucleon number 32
There are 16 protons (from the proton number). If it was a neutral atom, there would be 16 electrons.
Answer:
18.4 g
Explanation:
M(He) = 4.0 g/mol
4.6 mol * 4.0 g/ 1 mol = 18.4 g
<h2>Answer:</h2>
The correct answer is the option A which is: Cl2 + 2e- → 2Cl-
<h3>Explanation:</h3>
<em><u>Reduction is the gain of electrons and resulting in neutral or negative ions.</u></em>
<em><u>It is also the gain of hydrogen and release of oxygen ions.</u></em>
- According to first most definition, option A describes the reduction.
- Option B is incomplete reaction.
- While C and D are oxidation reactions.
The question is incomplete, the complete question is;
Which statement describes a difference between electromagnetic and mechanical waves?
A. Mechanical waves cannot be longitudinal, but electromagnetic waves can.
B. Electromagnetic waves cannot move particles, but mechanical waves can.
C. Electromagnetic waves do not require a medium, but mechanical waves do.
D. Mechanical waves do not transfer energy, but electromagnetic waves do.
Answer:
Electromagnetic waves do not require a medium, but mechanical waves do.
Explanation:
A wave is defined as a disturbance along a medium which transfers energy. Waves may be classified as mechanical waves or electromagnetic waves based on their medium of propagation.
A mechanical wave requires a material medium for propagation. An example of a mechanical wave is sound waves. Sound waves are propagated in air.
Electromagnetic waves do not require a material medium for propagation. They can travel through space. An example of electromagnetic waves is light waves.
<span>Vibrations that move through the ground carrying the energy released during an earthquake are called seismic waves. Seismic waves can be measured using a seismometer, which record the motion of the ground.</span>
