One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'. While Thompson concluded that there are negatively charged particles as part of the internal structure of the atoms.
-390.3 KJ is the Hrxn for the reaction →
<h3>What is Hess's Law?</h3>
Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
For Hess's Law, we need to get the corresponding equation below using the sequence of reactions given
By manipulating the reaction, either reversing them or multiplying/dividing them to a certain factor, we can get to the target equation as well as the total enthalpy.
→
→ ) ΔH = −74.6kJ (needs to reverse)
→ ΔH = −95.7kJ (retain)
→ ΔH = −184.6kJ (multiply by 2 to get and cancel out 4 HCl and )
Therefore, it is -390.3 KJ.
Hence, -390.3 KJ is the Hrxn for the reaction →
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A alkali metals
Explanation:
The family of alkali metals have a valency of 1 i.e they have one electron their outermost shell. They are groups of metals that reacts with water and can conduct electricity. The lose their valence electron and they have a net charge of +1 on them.
- Since they are metals, they readily conduct electricity.
- They are called alkali metals because their hydroxides are soluble in water
- They are very reactive metals and not usually found free in nature.
Their valence shells have an electronic configuration of ns¹
Examples are lithium, sodium, potassium, rubidium, caesium and francium.
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It is probably a worker bc it lets things in and out of the cell and stops harmful things from entering the cell