Answer:
The mass ratio of zinc to sulfide is 85:42.
2.5559 kg of Zn are in 3.82 kg of ZnS.
Explanation:
a) Mass of zinc sulfide = 254 g
Mass of zinc in a zinc sulfide sample = 170 g
Mass of sulfide in zinc sulfide sample = x
254 g = 170 g+ x
x = 84 g
The mass ratio of zinc to sulfide:
![\frac{170 g}{84 g}=\frac{85}{42}](https://tex.z-dn.net/?f=%5Cfrac%7B170%20g%7D%7B84%20g%7D%3D%5Cfrac%7B85%7D%7B42%7D)
b) Mass of zincsulfide sample = 3.83 kg
The mass ratio of zinc to sulfide is 85:42.
Let the mass of zinc and sulfide be 85x and 42x respectively:
85 x+ 42 x=3.82 kg
x =0.03007 kg
Mass of an zinc= 85x=85 × 0.03007 kg= 2.5559 kg
<span>Mantle convection is the slow creeping motion of Earth's rocky mantle caused by convection currents carrying heat from the interior of the earth to the surface. It is one of 3 driving forces that causes tectonic plates to move around the Earth's surface.</span>
Answer:
Las siguientes son reacciones químicas;
combustión de leña
oxidación del hierro
descomposición del agua en hidrógeno y oxígeno
Explanation:
Una reacción química da como resultado la formación de una (s) sustancia (s) nueva (s), mientras que un cambio físico no conduce a la formación de una sustancia nueva.
Las siguientes son reacciones químicas;
combustión de leña: la combustión de madera implica la oxidación del carbono según la reacción; C (s) + O2 (g) -------> CO2 (g)
oxidación del hierro: La oxidación del hierro conduce a la formación de óxidos de hierro. Como; 2Fe (s) + O2 (g) ----> 2FeO (s)
descomposición del agua en hidrógeno y oxígeno: esta es una reacción química en la que el agua se descompone de la siguiente manera; 2H2O (l) -----> 2H2 (g) + O2 (g)
Todos estos procesos enumerados anteriormente conducen a la formación de nuevas sustancias, por lo tanto, son reacciones químicas.
Based on the trend of electronegativities values of the elements <em>Be, Mg, Ca, </em>and,<em> Sr</em> within their group (increasing from bottom to top), the atoms of the element Sr will have the <u>least attraction</u> for an electron.
We need to remember that electronegativity indicates the affinity or attraction of an element for an electron. Hence, the <u>higher</u> the <em>electronegativity,</em> the<u> higher</u> the <em>attraction </em>of that element for an <em>electron</em>.
The values of <em>electronegativities </em>of the given <em>elements </em>are the following:
Be = 1.57
Mg = 1.31
Ca = 1.0
Sr = 0.95
We can see that the increasing trend of <em>electronegativities </em>in this group is from the <u>bottom to the top</u>, having the Sr with the lowest electronegativity value and the <em>Be</em> with the <em>highest</em>.
This trend is related to atomic size, the <u>larger</u> the <em>atomic size</em>, the <u>lower</u> the <em>electronegativity</em> because the <em>electron </em>in the outermost shell will feel <u>less attraction</u> towards the nucleus of an atom. In a group of the periodic table, the <em>size </em>of an <em>atom </em>will <em>increase </em>from <u>top to bottom</u>.
Therefore, according to the said above, the atoms of the Sr will have the least attraction for an electron (it has the lower electronegativity value).
Find more about electronegativity here:
I hope it helps you!