Why does the designed world change?

which of the following does not describe a metal? question 7 options: good conductor of heat good conductor of electricity tends

gladu [14]

Answer:

convalent compounds with non metals

7 0

2 years ago

If you were to use Lewis theory to predict the formula for the compound between rubidium and fluorine, it would most likely be:

goldenfox [79]

Answer: The formula of the compound formed between rubidium and fluorine is RbF

Explanation:

Ionic bond is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.

The atom which looses the electron is known as electropositive atom and the atom which gains the electron is known as electronegative atom. This bond is usually formed between a metal and a non-metal.

Rubidium is the 37th element of the periodic table having electronic configuration of $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^1$

This will loose 1 electron to form $Rb^+$ ion

Fluoride is the 9th element of the periodic table having electronic configuration of $1s^22s^22p^5$

This will gain 1 electron to form $F^-$ ion

To form $RbF$ compound, 1 rubidium ion is needed to neutralize the charge on fluoride ion

The formation of the given compounds is shown in the image below.

4 0

3 years ago

Are there a mole of golf in a 200 g gold necklace

meriva

Explanation:

The answer is 0.5 moles of gold

4 0

3 years ago

Which element would have a full outer shell of electrons if it gained three electrons?

Vsevolod [243]

Answer:

Octet Rule is defined as the chemical rule in which atoms tend to form bonds in such a way that it completes its valence shell or tend to achieve the configuration of a noble gas.

Explanation:

The lithium is chemical element, which has atomic number 3. It has one valence electron in its outermost shell, therefore, it will require 7 more electrons to complete its octet.

The element nitrogen has the atomic number 7, such that it has 5 valence electrons in its outer most shell. Therefore, it will require 3 more electrons to complete its octet.

The noble gas Argon have complete octet, such that it does not require any electrons to complete its octet. the gas is inert and non-reactive.

The chemical element Boron has atomic number 5, such that it has three electrons in its outer most shell. Therefore, it will require 5 more electrons to complete its octet.

Hence, the correct option is Nitrogen.

5 0

3 years ago

Read 2 more answers

Calculate your percent yield for the bromination of cis-stilbene. [Note: Assume that stilbene is the limiting reagent. You must

evablogger [386]

Answer:

See explanation below

Explanation:

To calculate any percent yield of a reaction you need to provide, the theorical data and the experimental data, which you are not providing.

I will do an example with some values I found on another place to explain to you how to do it. You then, replace the data you have and follow the same procedure.

Let's suppose we have the following data of the stilbene:

density: 1.0111 g/mL

volume used: 0.3 mL

Molecular weight: 180.25 g/mol

Now, we use 0.3 mL of cis stilbene to do a reaction with acid and bromine to produce the 1,2-dibromo-1,2-diphenylethane.

The problem stated that the cis stilbene is the limiting reactant, therefore, the moles consumed of stilbene, would be the moles produced of the final product.

With the density let's calculate the mass of stilbene, and then, with the molecular weight, the moles:

d = m/V ---> m = d*V

m = 1.011 * 0.3 = 0.3033 g

moles = 0.3033 / 180.25 = 0.0017 moles

These obtained moles would be the moles of the final product too, because stilbene is the limiting reactant so:

moles of product = 0.0017 moles

Let's calculate the mass:

Molecular weight of 1,2-dibromo-1,2-diphenylethane = 339.8 g/mol

m = 0.0017 * 339.8 = 0.5776 g

This would be the theorical mass obtained in the experiment. Now, let's suppose we obtained a mass of 0.4158 g. This is the actual yield of the reaction, so the percetn yield would be:

%yield = Exp yield / theo yield * 100

Replacing:

%yield = 0.4158/0.5776 * 100

%yield = 71.99 %

This would be the %yield of the bromination. All you have to do now, is replace your theorical and experimental data and you should get to the final and accurate yield.

7 0

4 years ago