In metallic bonds, the mobile electrons surrounding the positive ions are called a(n)

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Answer 1

Answer: It is called, Noble gas

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Chemistry work here. Please help as soon as possible. I have allot of questions that needs to be answered. Can someone do it for me?

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Answer:

I dont know about the yield but I think mno2 is the limiting reactant

A sample containing only carbon, hydrogen, and silicon is subjected to elemental analysis. After complete combustion, a 0.7020 g sample of the compound yields 1.4 g of CO2, 0.86 g of H2O, and 0.478 g of SiO2. What is the empirical formula of the compound?

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Answer: The empirical formula of compound is $C_4H_(12)Si$ .

Explanation:

Mass of Sample= 0.702 g

Mass of $CO_2$ = 1.4 g

Mass of $H_2O$ = 0.86 g

Mass of $SiO_2$ = 0.478 g

First we have to calculate moles of $CO_2$ , $H_2O$ and $SiO_2$ formed.

1. Moles of $CO_2=(1.4g)/(44g/mol)=0.032mol$

Now , Moles of carbon == Moles of $CO_2$ = 0.032

2. Moles of $H_2O=(0.86g)/(18g/mol)$ =0.048mol

Now , Moles of hydrogen = $2*$ Moles of $H_2O$ = $2* 0.048=0.096mol$

3. Moles of $SiO_2=(0.478g)/(60g/mol)=0.008$ mol

Now , Moles of silicon = Moles of $SiO_2$ = 0.008 moles

Therefore, the ratio of number of moles of C : H : Si is = 0.032 : 0.096 : 0.008

For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For C= $(0.032)/(0.008)=4$

For H = $(0.096)/(0.008)=12$

For Si= $(0.008)/(0.008)=1$

Thus, C: H: Si = 4 : 12 : 1

The simplest ratio represent empirical formula.

Hence, the empirical formula of compound is $C_4H_(12)Si$ .

What are two causes of soil loss?

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Answer: The agents of soil erosion are the same as of other types of erosion for example water, ice, wind, and gravity. Soil erosion is more likely where the ground has been disturbed by agriculture, grazing animals, logging, mining, construction, and recreational activities.Basically what I mean is some causes of solid loss is mining, construction

A chemist titrates 90.0 mL of a 0.5870 M acetic acid (HCH, CO) solution with 0.4794M NaOH solution at 25 °C. Calculate the pH at equivalence. The p Kg of acetic acid is 4.76. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of NaOH solution added

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Answer:

9.09

Explanation:

Please kindly check attachment for the step by step solution of the given problem.

A balloon has a volume of 7.00 liters at a pressure of 740 mm Hg. If the temperature remains constant, at what pressure will the volume decrease to 2.00 liters?a. 749 mm Hg
b. 52.9 mm Hg
c. 211 mm Hg
d. 2590 mm Hg