Dalton was the first scientist to create an atomic theory but he wasn't given any credit. J.J Thompson was credited for his theory (apple pudding)
Answer:
The electrochemical series is an arrangement of metals in such order that any metal in the list is displaced from its compounds by any metal above it, but displaces any metal below it. The higher up the list a metal is, the greater its activity. Knowing a metal’s placement on this chart can help you understand the activity of the metal, especially in regard to its ability to displace hydrogen in acids. Any items on the list far above hydrogen will do a good job at displacing it, those near it won’t do such a good job, and those below it won’t displace it from acids at all.
Explanation:
I got this answer straight from Penn foster.
Answer:
- <u><em>Option C) Fr (francium)</em></u>
Explanation:
<em>Fluorine (F) </em>is not a metal; thus, the last option is discarded quickly.
The<em> most reactive metals</em> are the alkali metals, group 1 of the periodic table, because they have just one valence electron, which they can release more easily than other metals which have more valence electrons.
<em>Lithium(Li)</em> and <em>francium (Fr)</em> are alkali metals, while <em>aluminum (Al)</em> belongs to group 13, which means that it has 3 valence electrons.
Thus, aluminum is out of race too.
Lithium is in the second period (row 2 of the periodic table) while francium is in the last period (row 7).
The reactivity of metals in a group increases from top to bottom, because the valence electrons are shielded by many electrons (which are in the orbitals of less energy and closer to the nucleus of the atom), meaning that the valence eletrons can be released more easily.
Hence, the most reactive metal from the list is Fr (francium), option C).
Answer:
d The energy from the sun heated the water, causing it to evaporate.
Explanation:
The correct description of what happened is that the energy from the sun heated the water and causes it to evaporate completely.
Evaporation is a phase change process in which liquid is converted to gases. This occurs when a liquid gains considerable amount of energy. The molecules then breaks free from the bond holding compound place.
- Option A is wrong because the energy from the sun does not cause condensation i.e. change from gas to liquid.
- The water on the seat does not boil, it simply evaporates. So, option B is wrong.
- When heat energy is added, it does not cause cooling of water. So option C is wrong.
Mitochrondria because where its found, <span>biochemical processes of energy production and respiration occur.</span>