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Papessa [141]
4 years ago
7

Which of these elements has physical and chemical properties most similar to silicon (Si)?

Chemistry
2 answers:
ICE Princess25 [194]4 years ago
7 0

Answer: Option (1) and (2) are correct.

Explanation:

Elements which contain same number of valence electrons tend to show similar chemical properties. This is because having same number of valence electrons will make the atoms to react in a similar way.

For example, Silicon is a group 14 element. So, it contains only 4 valence electrons. Similarly, germanium and lead are group 14 elements and it has 4 valence electrons.

Therefore, silicon, germanium, and lead will have similar chemical properties.

Whereas phosphorous is a group 15 element, and chlorine is a group 17 element.

Thus, we can conclude that out of the given options germanium and lead elements has physical and chemical properties most similar to silicon (Si).

siniylev [52]4 years ago
6 0
In order from most to least similar:
1. Germanium
2. Lead
3. Phosphorus
4. Chlorine
The elements in the same column as the element you have are the most similar. The rows are not. For example, though chlorine and magnesium are in the same row, they have very different properties, whereas chlorine and fluorine more similar
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How to draw Hess' Cycle for this question ?
NISA [10]

Answer : The standard enthalpy of formation of ethylene is, 51.8 kJ/mole

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The formation reaction of C_2H_4 will be,

2C(s)+2H_2(g)\rightarrow C_2H_4(g)    \Delta H_{formation}=?

The intermediate balanced chemical reaction will be,

(1) C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)     \Delta H_1=-1411kJ/mole

(2) C(s)+O_2(g)\rightarrow CO_2(g)    \Delta H_2=-393.7kJ/mole

(3) H_2(g)+\frac{1}{2}O_2(g)\rightarrow H_2O(l)    \Delta H_3=-285.9kJ/mole

Now we will reverse the reaction 1, multiply reaction 2 and 3 by 2 then adding all the equations, we get :

(1) 2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)     \Delta H_1=+1411kJ/mole

(2) 2C(s)+2O_2(g)\rightarrow 2CO_2(g)    \Delta H_2=2\times (-393.7kJ/mole)=-787.4kJ/mole

(3) 2H_2(g)+2O_2(g)\rightarrow 2H_2O(l)    \Delta H_3=2\times (-285.9kJ/mole)=-571.8kJ/mole

The expression for enthalpy of formation of C_2H_4 will be,

\Delta H_{formation}=\Delta H_1+\Delta H_2+\Delta H_3

\Delta H=(+1411kJ/mole)+(-787.4kJ/mole)+(-571.8kJ/mole)

\Delta H=51.8kJ/mole

Therefore, the standard enthalpy of formation of ethylene is, 51.8 kJ/mole

7 0
3 years ago
10) Explain what arsenic had to do with preserving bodies in the past and how that related to Sylvester’s body. Tell me how the
Salsk061 [2.6K]
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9) R<span>esearch can yield dates when certain plants/animals became domesticated and entered the standard diets of people, meaning you would not see masses eating beef before the cow became domesticated. To further this you can look at when a specific food was introduced into the diets of people in the geographic area of the person you are studying. </span>


5 0
4 years ago
Complete this sentence. If mass remains the same while the volume of a substance ________, the density of the substance will____
9966 [12]

Answer:

If mass remains the same while the volume of a substance changes, the density of the substance will also change.

4 0
3 years ago
3. If a cation replaces an anion, the compound would have 2 positive charges. Why would this never happen
Jet001 [13]

A cation will not replace an anion in a compound because the two positively-charged ions will repel each other.

<h3>Ions</h3>

Ions are atoms or group of atoms possessing an electrical charge.

  • Positively-charged ions are known as cations.
  • Negatively-charged ions are known as anions.

<h3>Ionic compounds</h3>

Ionic compounds are compounds which are composed of oppositely charged ions held together by strong electrostatic forces of attraction between the oppositely charged ions.

  • From law of electrostatics, like charges repel and unlike charges attract.

If a cation replaces an anion, the compound would have two l positive charges which will repel each other.

Therefore, a cation will not replace an anion in a compound because the two positively-charged ions will repel each other.

Learn more about ions and electrostatics at: brainly.com/question/13690700

3 0
3 years ago
Most scientists use scientific methods in which of the following orders
igomit [66]

Answer:

Experiment, analysis, research, purpose, hypothesis and conclusion.

6 0
3 years ago
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