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Rasek [7]
3 years ago
15

In general, an atom with _________________ electrons in its valence shell tends to lose electrons and form a ___________________

charged ion. An atom with __________________ electrons in its valence shell tends to _________________ electrons and form a _______________ charged ion.
Chemistry
1 answer:
Tatiana [17]3 years ago
7 0

Explanation:

When an atom tends to gain an electron then it forms a negatively charged ion. Whereas when an atom tends to lose an electron then it acquires a positive charge.

For example, any element having more than eight electrons in its valence shell will tend to lose electron(s).

And, any element having less than eight electrons will tend to gain electron(s).

Thus, we can conclude that in general, an atom with more than eight electrons in its valence shell tends to lose electrons and form a positively charged ion. An atom with less than eight electrons in its valence shell tends to gain electrons and form a negatively charged ion.

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Alchemy is a branch of ancient knowledge that states that the only three essential substances in nature are salt, sulfur, and me
Ivanshal [37]

Answer:

It is pseudoscience because there are at least 118 known elements in nature.

Explanation:

Alchemy is an ancient branch of natural philosophy (not used much anymore).

I also just took the test and it's correct.

4 0
3 years ago
Helppppp meeeeeeeeeeeeeeeeeeeeeeeeeeeee ill mark brainlist
sergey [27]
Grasshopper population will increase since they have less predators
3 0
3 years ago
Read 2 more answers
In a heat engine, 700 J of heat enters the system, and the piston does 400 J of work. What is the final internal (thermal) energ
Vitek1552 [10]

The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.

<h3>What is internal energy?</h3>

The energy present in a system itself for conducting reactions is called internal energy.

Given,

  • Heat entering system (Q) = 700 J
  • Work done by the piston (W) = 400
  • Initial energy (\rm U_{1})= 1200 J

According to the <u>first law of thermodynamics</u>:

\rm Q = \Delta U + W

Substituting values in the above equation:

\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2}  &= \rm Q - W + U_{1}\\\\\rm U_{2}  &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}

Therefore, option D. 1500 J is the final energy.

Learn more about internal energy here:

brainly.com/question/2602565

4 0
2 years ago
Read 2 more answers
A rectangular metal bar has a volume of 50.0 in³. The bar weighs 1.42 kg. Calculate the density of the metal in
Olegator [25]
You would do M divided by V= D and the answer is 0.0284
5 0
3 years ago
Teniendo en cuenta los siguientes fenómenos: ebullición del agua- movimiento de un cuerpo- disolución de sal en agua- combustión
miv72 [106K]

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.

3 0
2 years ago
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