CHEMISTRY HIGH SCHOOL

The radius of an atom of gold (Au) is about 1.35 Å.How many gold atoms would have to be lined up to span 9.5 mm ?

Answers

Answer 1

Answer:

Answer : The number of gold atoms will be, $3.52* 10^7$

Explanation :

First we have to determine the diameter of an atom of gold.

$Diameter=2* Radius$

Given :

Radius of an atom of gold = $1.35\AA$

$Diameter=2* 1.35\AA=2.7\AA$

Conversion used : $(1\AA=10^(-7)mm)$

$Diameter=2.7\AA=2.7* 10^(-7)mm$

Now we have to calculate the number of gold atoms.

$\text{Number of gold atoms}=\frac{\text{Span length}}{\text{Diameter of an atom of gold}}$

$\text{Number of gold atoms}=(9.5mm)/(2.7* 10^(-7)mm)=3.52* 10^7$

Therefore, the number of gold atoms will be $3.52* 10^7$

Answer 2

Answer: Two radius of an atom is equal to the diameter. Adding up all the diameter of the atoms, it should be equal to 9.5 mm. Therefore, we simply convert the units to the same units then divide 1.35 A to 9.5 mm. We calculate as follows:

no. of atoms = 0.0095 m / 1.35x10^-9 m = 7037037 atoms

Hope this answers the question. Have a nice day.

Related Questions

The chemical process in which electrons are gained by an atom or an ion is called
77. 1 kilograms. What's The mass in grams
Which of the following examples depict(s) a physical property?
What is the combustibility of calcium?
A rock has 12.5 percent of its original amount of potassium-40 remaining in it; potassium-40 has a half-life of 1.25 billion years. How long ago was the rock formed?a) 1.25 billion years ago b) 2.5 billion years ago c) 3.75 billion years ago d) 5 billion years ago

Chuck wants to know how many electrons in an atom are not paired up. Which model would be best for Chuck to writeout?
a set of quantum numbers for the last electron in the atom
a configuration with numbers, letters, and superscripts
a dot structure of the atom
an orbital notation of the atom

Answers

Answer:

D. an orbital notation of the atom

Explanation:

Orbital notiation uses lines and arrows to show shells, subshells, and orbitals for electrons in an atom. Since it shows arrows being paired up in this diagram it would be the best model for Chuck to use.

On Edgenuity2020, the answer is D) an orbital notation of the atom

How much calcium hypochlorite (65% strength) is needed to make 200 L of 2% hypochlorite solution? (Assume that a 1% solution is equivalent to 10,000 mg/L concentration)

Answers

To solve this we use the equation,

M1V1 = M2V2

where M1 is the concentration of the stock solution, V1 is the volume of the stock solution, M2 is the concentration of the new solution and V2 is its volume.

65 x V1 = 2 x 200 L

V1 = 6.15 L

A student is running an experiment in which 60.3 grams of LiCl is needed, but the only jar of reagent in the lab is labelled lithium chloride monohydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?

Answers

Answer:

Mass of the hydrated salt required is 85.8 g

Explanation:

Molar mass of anhydrous lithium chloride = 42.5 g/mol

Molar mass of lithium chloride monohydrate = 60.5 g/mol

Mass of water molecule in the hydrated salt = 18 g/mol

Ratio of lithium chloride to water molecule in the hydrated salt = 42.5 : 18

Mass of water molecule in the hydrated salt that will contain 60.3 g of lithium chloride = 60.3/42.5 × 18 g = 25.5 g

Therefore mass of hydrated salt required = (60.3 + 25.5) g = 85.8 g

The student will have to weigh out 85.8 g of the hydrated salt, and then heat the salt in an evaporating dish until it decomposes to liberates all the water of hydration in order to obtain the anhydrous salt.

Interstellar dust particles help cool the nebular cloud by _____.slowing particles down
allowing particles to collect
clumping particles together
attracting the heat of the nebular cloud

Answers

Answer: Attracting the heat of the nebular cloud

Heat is lessened by interstellar dust through attraction of heat in the gas cloud. The nebular cloud’s heat, coming from radiation emitted by stars, is indirectly cooled down by dust through ionization and beams it towards space.

The bond between Br atoms in a Br2 molecule is(1) ionic and is formed by the sharing of two valence electrons
(2) ionic and is formed by the transfer of two valence electrons
(3) covalent and is formed by the sharing of two valence electrons
(4) covalent and is formed by the transfer of two valence electrons

Answers

The bond between Br atoms in an Br2 molecule is concealment and is formed by sharing of two valence electrons.

Final answer:

The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.

Explanation:

The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.

In a covalent bond, atoms share electrons to complete their outer electron shell. In the case of a Br2 molecule, each Br atom has 7 valence electrons and needs 1 more electron to achieve a stable octet arrangement, so they share one pair of electrons to achieve this.

The bond between Br atoms in a Br2 molecule is covalent and is formed by the sharing of two valence electrons.

Learn more about Bonding in Br2 molecule here:

brainly.com/question/31834826

#SPJ6

Which best describes the effect of J. J. Thomson’s discovery

Answers

Well one effect of J. J. Thomson's discovery is that he actually got a Nobel Prize. I don't really know what your choices are, so it's kinda difficult to know what you need.

Other Questions

According to Hess’s law, if a series of intermediate reactions are combined, the enthalpy change of the overall reaction isthe difference between the enthalpies of the intermediate reactions.the sum of the enthalpy changes of the intermediate reactions.the product of the enthalpy changes of the intermediate reactions.the fraction of the individual enthalpies of the intermediate reactions.

The solubility of KClO3(s) in water increases as the(1) temperature of the solution increases(2) temperature of the solution decreases(3) pressure on the solution increases(4) pressure on the solution decreases

Leutium-176 has a half-life of 3.85 mc012-1.jpg 1010 years. After 1.155 mc012-2.jpg 1011 years, how much leutium-176 will remain from an original 16.8-g sample?2.10 g 3.00 g 5.56 g 8.40 g

1.11g of methane CH4 is burned in a bomb calorimeter containing 1000 grams of water. The initial temperature of water is 24.85 degrees Celsius. The specific heat of water is 4.184 J/g degrees Celsius. The heat capacity of the calorimeter is 695 J/degrees Celsius. After the reaction the final temperature of the water is 35.65 degrees Celsius. Calculate the heat absorbed by the water. Then calculate the heat absorbed by the calorimeter.