Suppose you were to make a ring from a single strand of gold atoms. How many gold atoms would be required to make such a ring? How much would the ring weigh in grams?

Answers

Answer 1
Let us assume that the ring is a size 7 ring, which has a circumference of 54.3 millimeters. Converting this to centimeters, the circumference of the ring is:

54.3 mm = 5.43 cm

Now, we determine the number of gold atoms that will be present in this:

5.43 / 1 x 10⁻⁹

There will be 5.43 x 10⁹ atoms


We now determine the number of moles this is by:

one mole = 6.02 x 10²³ atoms

Moles = 5.43 x 10⁹ / 6.02 x 10²³ 
Moles = 9.01 x 10⁻¹⁵ moles

The molar mass of gold is 197 g/mol

The mass is 9.01 x 10⁻¹⁵  * 197

The mass of the strand is 1.76 x 10⁻¹² grams
Answer 2

Answer:

Suppose you were to make a ring from a single strand of gold atoms. Then you have to take the following steps;

Let us assume that the ring is a size 7 ring, which has a circumference of 54.3 millimeters. Converting this to centimeters, the circumference of the ring is:

54.3 mm = 5.43 cm

Now, we determine the number of gold atoms that will be present in this:

5.43 / 1 x 10⁻⁹

There will be 5.43 x 10⁹ atoms

We now determine the number of moles this is by:

one mole = 6.02 x 10²³ atoms

Moles = 5.43 x 10⁹ / 6.02 x 10²³ 

Moles = 9.01 x 10⁻¹⁵ moles

The molar mass of gold is 197 g/mol

The mass is 9.01 x 10⁻¹⁵  * 197

The mass of the strand is 1.76 x 10⁻¹² grams




Related Questions

The tip of a match is ignited as it is struck against the matchbox. Why is this a chemical change?

The color of the match tip has changed.
The match changes size as it burns.
The tip of the match is flammable and is set on fire.
The match is melting.

Answers

This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore option c is correct option

What is chemical change?

Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same

One famous example of chemical change is the rusting of iron. In our case tip of match is ignited  as it is struck against the matchbox, so here combustion reaction is taking place, Red phosphorous is burning in presence of oxygen. The color, odor and arrangements of atoms in products are very much different from reactant.

Therefore, the tip of the match is flammable and is set on fire is the correct one . The correct option is option C

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When this element was discovered, it exhibited luster and malleability, and it reacted very vigorously with water. This element is never found as a free element in nature and always exists in a compound. To which group does this element most likely belong?

Answers

the answer is potassium

The element likely belongs to Group 1: The Alkali Metals, which are characterized by their luster, malleability, and vigorous reaction with water. They are never found free in nature and always exist in compounds.

The element described is likely to belong to Group 1: The Alkali Metals. These elements exhibit luster and malleability, and they react vigorously with water, typically forming alkaline solutions. They are never found as free elements in nature due to their high reactivity, particularly with water and oxygen in the air, and are always found in compound form.

Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium, each having a single electron in their outermost shell, which is very easily removed during chemical reactions making them very reactive.

The structure of a comet is considered to be like a large, ____, or a mass of frozen ice and rock. a. solid planet c. cratered moon b. dirty snowball

Answers

B is the correct answer I hope that this help 

science question down below

Answers

The answer is C bacteria

What happens to the total mass of a substance undergoing a physical change

Answers

That depends. What kind of change are you talking about? But

Mass through chemical change stays the same as well. Example: burning paper, the ash left behind is not all of the mass of the reactants, Carbon dioxide, and other substances also makeupmass but just is not seen

If your answer choices are:

It stays the same.

It doubles.

It triples.

It is reduced.

The correct answer is "It stays the same."

In the unit cell of galena, six square faces of equal size each form 90 degree angles with every adjacent face. What type of crystal system is this

Answers

Lysergic crystal system. hope i helped.

how might a scientist confirm the result of other experiments by doing an experiment?

Answers

By conducting additional experiments, the scientist could add to their hypothesis and their data. This could either confirm and build their hypothesis or break their hypothesis. 

Answer:

The correct answer will be- repetition of the experiment ensures the validity and truthfulness of the results.

Explanation:

In the scientific community, the repetition of the experiment using the same procedure by the same researcher or another researcher plays an important role.  

The repetition of the experiment is done to test and verify the results which could be doubtful or fraud. The experimental results of another experimenter act as evidence which if similar supports the experiment and help ensure the validity of the experiment.

Thus, the repetition of the experiment ensures the validity and truthfulness of the results is the correct answer.

water is most dense at 4 degrees celsius. since at this temperature 1 ml of water has a mass of 1g its density is what

Answers

well its would still 1g because

What is the difference between Boron (B) and Neon (Ne).
( Please answer correctly and not asking me to look on google)

Answers

https://prezi.com/ax4mjlrfk007/neon-and-boron/

This cite has lists of differences in the transcript! I hope that helps! 

A rock has a volume of 50 mL and a mass of 200 g. What is the density??? please help

Answers

density is 4
200g divided by 50 mL will equal the density

During an oil spill, oil coats the surface of the water, endangering sea life. Why doesn’t oil dissolve in ocean water

Answers

Oil doesn't dissolve in ocean water, because it doesn't mix with water. I believe oil is lighter than water, and will generally float on the upper layers of the water.
It will only be able to expand in the top, and will not be able to completely dissolve

hope this helps

Which one of these statements does not refer to radiation

Answers

warm air rises and takes heat with it

Please select the word from the list that best fits the definition. ______ occurs when particles in a gas lose enough energy to form a liquid.

Answers

Condensation occurs when particles in a gas lose enough energy to form a liquid.

Explain why it is important that there be no gaps around the edges of the filter paper
during a vacuum filtration.

Answers

The filter paper cannot be folded up the sides, or have any gaps, because if it does, a significant amount of the solid will "run through" the filter paper.

Vacuum filtration is a separation technique that is used to separate a solid product from a liquid. The method involves pouring the mixture of the solid and the liquid through a filter paper that is inserted inside a funnel. The filter paper trap the solid while the liquid is drawn through the funnel into the flask by a vacuum. It is very important to ensure that there is no gap around the edges of filter paper that is inserted into the funnel so that the mixture will not escape the filter paper and be poured directly into the flask below, thus messing up the separation process.

A scientific has a lot of support and is more than just a hunch

Answers

What is the question exactly?
?? Science are supposed too have a lot support

In the game of economics, goods are objects that fulfill peoples needs and ____.

Answers

Goods are objects that fulfill peoples needs and wants.


Which is a TRUE statement about the subatomic particles that make up all neutral atoms?
A. The number of neutrons and the number of protons are the same.
B. The number of protons and the number of electrons are the same.
C. The number of electrons and the number of neutrons are the same.

Answers

B. The number of protons and the number of electrons are the same.
:)

Answer: The correct answer is Option B.

Explanation:

There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.

Protons: They carry positive charger and are found in nucleus.Electrons: They carry negative charge and are found around the nucleus.Neutrons: They dos not carry any charge and are found in nucleus.

Any neutral atom has equal number of protons and electrons.

Hence, the correct answer is Option B.

compare and contrast sometimes you use your senses to make observations to find the answer to a question. Other times you use tools and measurements to provide answers. Compare and contrast these two methods of answering scientific questions.

Answers

When using your senses to answer scientific questions, you are using qualitative data. When using tools and measurements, you are using quantitative data. Qualitative data can be more subjective, and sometimes it may not be too reliable. Quantitative data, or data gathered using tools and other reliable methods of measurements, are more reliable.

Which of the following is a scientific question?

Why do leaves change color?
What time will the next earthquake happen?
What is the best flavor of ice cream?
Where is the fountain of youth?

Answers

why do leaves change color is the scientific question

A double replacement reaction can be best described as a reaction in which

Answers

You have two nonmetal formulas and they switch. I think that's it. It'll get you partial credit at least. I hope it helps!

Answer:

Explanation:

A double repalcement reaction is a type of reaction in which there is exchange of ions between two compounds leading to the formation of new products. It is also known as double displacement reaction.

BC+DE produces BE+CD.

A double replacement reaction leads to the formation of two new compounds Be and CD.

the density of gold is 19.3 g/cm^3. You inherit a gold bar that measures 7.0 in by 3.0 in by 2.0 in. How many ounces does the bar weigh? Express answer in scientific notation.

Answers

You can work out the following: Mass = Density x Volume Density = Mass Ă· Volume Volume = Mass Ă· Density The density of gold is 0.670205 oz/cm^3 The volume is length x width x depth = 7*3*2 = 42 The answer is Mass = 0.670205 x 42 = 281 ounces
Final answer:

To find the weight of the gold bar, we need to calculate its volume and use the density of gold. The gold bar weighs approximately 467.96 ounces.

Explanation:

To find the weight of the gold bar in ounces, we first need to calculate its volume in cubic inches and then convert it to cubic centimeters.

Given:

Length = 7.0 inchesWidth = 3.0 inchesHeight = 2.0 inches

The volume (V) of a rectangular prism is given by V = Length x Width x Height.

V = 7.0 in x 3.0 in x 2.0 in = 42.0 in³

Since 1 inch is equal to 2.54 centimeters, we can convert the volume to cubic centimeters:

V = 42.0 in³ x (2.54 cm/in)³ = 686.98 cm³

Now, to find the weight of the gold bar in ounces, we can use the density of gold, which is 19.3 g/cm³.

The formula for density is Density = Mass/Volume.

Since we know the density and the volume, we can rearrange the formula to solve for the mass:

Mass = Density x Volume

Mass = 19.3 g/cm³ x 686.98 cm³ = 13,257.814 g

Finally, to convert the mass from grams to ounces, we divide by 28.35 grams/ounce:

Weight in ounces = 13,257.814 g / 28.35 g/oz = 467.96 oz

Therefore, the gold bar weighs approximately 467.96 ounces.

Your teacher gives you a black powder. When you dissolve the powder in water, you see red particles that float to the top, black particles that sink to the bottom, and a green liquid. Was the black powder a pure substance, mixture, element, or compound? compound element pure substance mixture I think it is A

Answers

The answer is B. A mixture can be separated as shown in the example.

Answer: Option (a) is the correct answer.

Explanation:

A substance that cannot be broken down into simpler substances is known as an element.

For example, a piece of sodium metal contains only atoms of sodium.

Whereas a compound is defined as a substance that contains two different elements which are chemically combined together in a fixed ratio by mass.

For example, LiCl is a compound in which atoms are present in 1:1 ratio.

A compound is able to dissociate into its constituent particles but an element cannot.

Both an element and a compound are pure substances.

A mixture is defined as a substance in which two or more number of different substances are mixed together. Particles of a mixture never combine chemically to each other.

So, when black powder on coming in contact with water dissociates as red particles that float to the top, black particles that sink to the bottom, and a green liquid. Then it means a chemical reaction has taken place.

Hence, we can conclude that the black powder is a compound.

A sample contains 430 mg of mercury. How many significant figures are in the number?

Answers

2 significant figures

A certain ore is 26.9% nickel by mass. How many kilograms of this ore would you need to dig up to have 50.0 g of nickel?

Answers

the answer is 185.87g to 2 decimal places.

To extract 50.0 g of nickel from an ore that is 26.9% nickel by mass, you would need approximately 0.1859 kilograms of the ore.

To calculate the amount of ore needed to obtain 50.0 g of nickel, we use the percentage of nickel in the ore and set up a simple proportion.

Firstly, we know that the ore is 26.9% nickel by mass. This means that for every 100 g of ore, there are 26.9 g of nickel.

To get 50.0 g of nickel, we can set up the equation (26.9/100) × mass of ore = 50.0 g.

By rearranging the equation for the mass of the ore, we get the mass of the ore = (50.0 g) / (26.9/100).

Calculating the mass of the ore, we find it to be approximately 185.9 g, which we can then convert to kilograms.

To convert grams to kilograms, we divide by 1000. So, 185.9 g is equivalent to 0.1859 kg.

Therefore, to obtain 50.0 g of nickel, approximately 0.1859 kilograms of ore is required.

How many kilograms of the rock must be processed to obtain 2.0 kg of Pb ?

Answers

15 kg of rock needs to be processed to obtain 2 kg of pb

the correct formula for aluminum phosphide

Answers

Aluminium phosphide.....

An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?A) An atom that contains 12 protons and 13 neutrons. B) An atom that contains 13 protons and 12 neutrons. C) An atom that contains 12 protons and 25 neutrons. D) An atom that contains 25 protons and 12 neutrons.

Answers

A. An atom that contains 12 protons

Atomic number is the same as how many protons and electrons an atom has. The mass is how many protons and neutrons there are together. In this case it would be 25 (mass) - 12 (protons) = 13 (neutrons).

Answer: The correct answer is Option A.

Explanation:

An atom consists of 3 subatomic particles: Electrons, neutrons and protons.

Atomic number is equal to the number of electrons or number of protons.

Atomic number = Number of electrons = Number of protons    ....(1)

Mass number is the sum of number of protons and number of neutrons.

Mass number = Number of protons + Number of neutrons    .....(2)

We are given:

Atomic number = 12

Mass number = 25

From equation 1:

Number of protons = Number of electrons = 12

From equation 2:

Number of neutrons = 25 - 12 = 13

Thus, an atom contains 12 protons and 13 neutrons.

Hence, the correct answer is Option A.

The andromeda galaxy is located approximate 2.5 million light-years from earth. Why is the light that Reaches earth 2.5 million years old

Answers

 its not. A 2.5 million light years 14696563432959 miles light years aren't actually years they're just another term for a certain amount of miles.

Which is an example of a plasma that occurs in nature

Answers

flames, lightning, and/of auroras.
Final answer:

Plasma is the most energetic state of matter and primarily consists of ionized gases. Natural examples of plasma include stars like the Sun and phenomena like lightning, which ionize gases due to their high temperature and energy.

Explanation:

The question asks for an example of a plasma that occurs in nature. Plasma is the most energetic state of matter and is characterized by ionized gases made up of negatively charged free electrons and positively charged ions. In nature, stars such as the Sun are perfect examples of this. Stars, including the Sun, are so hot that the material they are composed of exists in the form of an ionized gas, or plasma. All particles in this state are rapidly in motion, continuously colliding with each other, leading to the pressure of the gas.

Not only stars, but certain weather phenomena such as lightning also contain plasma. The lightning's heat ionizes the gases in the atmosphere, leading to a plasma state. Therefore, the Sun and lightning are examples of plasma occurring naturally in the universe.

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The graph represents the heating of water in a pot. At 150 seconds, the water has just reached a boil. If the heat is left on, what will happen to the temperature and volume of water in the pot? (All temperatures in °C.) Temperature graph A. The temperature will rise, and the water volume will decrease. B. The temperature will rise, and the water volume will remain constant. C. The temperature will remain constant, and the water volume will decrease. D. The temperature will remain constant, and the water volume will remain constant.

Answers

The correct option is C.
For all liquids, at boiling point the temperature remain constant while the volume of the liquid will decrease.
 The temperature applied at boiling point is used to break the inter molecular forces that are holding the particles of the liquid together.
The volume of the liquid is decreasing because the particles are changing to gas and escaping to the atmosphere as gas. 

Answer:

c

Explanation:

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