How many moles of gold, a U, are in 3.60×10^-5 G of gold?

Answer:

tundra

Explanation:

tundras are really cold and that's what R represents as R = square

Answer:

Tundra

Explanation:

The squares go under 0 degrees a lot!!

Conductivity level probes can only be used with conductive liquids.

a) True

The conductivity probe is the level of point measuring system consist of two or more probes or electrodes or electrodes and vessel ,the material in the vessel completes the circuit when the level will rise in the vessel. A probe is the insertable device which have the sensor. the conductive liquids are that are the solution of the acids , the bases and the salts. sugar solution and the distilled water are poor conductors.

Thus, it is true that , Conductivity level probes can only be used with conductive liquids.

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The circumstance that needs to occur in order for elements to form a compound is known as a chemical reaction. Thus, the correct option for this question is D.

A chemical reaction may be defined as a methodology through which one or more substances known as the reactants are significantly transformed into one or more different substances that are known as the products in the presence of enzymes or energy.

A series of elements undergo chemical reactions spontaneously in order to transform themselves into chemical compounds. The properties of each element prior to the reaction are unique but after the reaction, the properties of all the elements are now present in the single compound.

Therefore, the circumstance that needs to occur in order for elements to form a compound is known as a chemical reaction. Thus, the correct option for this question is D.

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Answer:

the sum is Rs 4,200

Explanation:

Given that

3 by 7 of the sum is $1,800

We need to find out the sum

So,

Here we assume the sum be x

So the following equation should be made

3 ÷ 7 × x = 1800

3x = 1800 × 7

x = (1800 × 7) ÷ 3

= Rs 4,200

Hence, the sum is Rs 4,200

The same would be considered and relevant

Answer:

electrons

Explanation:

The group number tells you the number of electrons in the element's outer shell (or valence shell).

Extra info: Elements with the same number of electrons on their outer shell are grouped together in the periodic table because they have similar properties.

Hope this helps!

Answer:

There is only one sub level in the first principal energy level, and it is 1s

Explanation:

trust

The answer cannot be determined with certainty, but option B, 1a,Te, is a possibility. Te is the chemical symbol for the element tellurium, which has an atomic number of 52.

The given nuclear reaction is incomplete, so it is impossible to determine the answer with certainty. However, we can make some assumptions based on the given information. The nuclide that is missing is the one that would combine with the reactants to form the product. The reactants are not specified, so we cannot use this information to determine the missing nuclide. However, we do know that the missing nuclide must have a mass number of 123, since this is the mass number of the product.
Based on this information, we can eliminate options C and D, since they do not have a mass number of 123. Option A, 12:Sb, is not a valid chemical symbol, so it can also be eliminated. This leaves options B and E. Option E, none of the above, is a possibility since we do not have enough information to determine the missing nuclide. Option B, 1a,Te, is a possibility since it has a mass number of 123 and contains the element Te.
A nuclear reaction involves changes to the nucleus of an atom, typically resulting in the formation of a different nuclide. The given nuclear reaction is incomplete, as it does not specify the reactants. However, we do know that the missing nuclide must have a mass number of 123, since this is the mass number of the product. Based on this information, we can eliminate some of the answer choices. Option C, insb, has a mass number of 120, which is not compatible with the mass number of the product. Option D, 111, has a mass number that is too low. Option A, 12:Sb, is not a valid chemical symbol. This leaves options B and E as possibilities. Option B, 1a,Te, has a mass number of 123 and contains the element Te. However, it is not possible to determine the correct answer with certainty without additional information.

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When magnesium is reacted with Air two products are produced which are magnesium oxide{MgO} and the other product is magnesium nitride {Mg₃N₂}

Mg₃N₂ is the empirical formula.
The  product formed when the compound is reacted with water is magnesium hydroxide and ammonia

Magnesium is produced because the heat produced during the reaction of it with oxygen produces a lot of heat the heat breaks the triple bonds in nitrogen forcing it to react with magnesium hence magnesium Nitride is the end product of the reaction

magnesium Nitride when reacted with water reacts to produce magnesium hydroxide and ammonia gas

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Answer:

you pick it up with gloves and make minimal contact with it

Sure, here are six common uses of natural gas in the everyday lives of people in the U.S: Heating homes and buildings,
Cooking, Electricity generation, Transportation, Industrial processes and Commercial uses.

1. Heating homes and buildings: Natural gas is used as a primary heating fuel in many homes and buildings across the U.S., providing warmth and comfort during colder months.

2. Cooking: Natural gas is used as a fuel for stoves and ovens in many households, allowing people to cook food efficiently and quickly.

3. Electricity generation: Natural gas is a popular fuel for power plants, producing electricity that powers homes, businesses, and other facilities.

4. Transportation: Natural gas is increasingly used as a transportation fuel, powering vehicles such as buses and trucks.

5. Industrial processes: Natural gas is used as a fuel in a variety of industrial processes, such as refining and manufacturing.

6. Commercial uses: Natural gas is used in a variety of commercial applications, such as for heating and cooling buildings, powering equipment, and fueling vehicles used for business purposes.

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Answer:

A) In aldehydes, the carbon is always joined to at least one hydrogen atom.

Explanation:

Aldehydes and Ketones are organic compounds.

The main difference between them is that aldehydes have the carbon atom attached to at least one hydrogen atom.

In ketones, the carbon is attached to another carbon.

To reiterate, the striking difference between the two families is that in alkanals, a hydrogen atom is directly attached to the carbonyl group while in alkanones, no hydrogen atoms is attached to the carbonyl group but two bulky alkyl groups.

The amount of numbers could he set before he ran out of some digits if he had 100 of each of the digits from 0 to 9 is maximum of 1000 numbers.

To find out how many numbers the printer could set before running out of some digits, we need to consider the maximum number of each digit that he would need to print all the numbers from 1 to 1,000.

Starting with the thousands place, we know that there are no digits from 1 to 9 that would be needed since there are no numbers between 1 and 999 that have a digit in the thousands place.

Moving on to the hundreds place, we know that we would need 100 of each digit from 1 to 9 to print all the numbers from 100 to 999. That's a total of 900 digits needed.

Finally, in the ones place, we know that we would need 100 of each digit from 0 to 9 to print all the numbers from 1 to 99 (since we've already accounted for the numbers from 100 to 999 in the hundreds place). That's another 1,000 digits needed.

Adding up all the digits we need, we get:

0 x 100 = 0

1-9 x 100 = 900

0-9 x 100 = 1000

Total = 1900 digits needed

Since the printer has 100 of each digit, the maximum number of numbers he could set before running out of some digits is:

100 x 10 = 1000

So he could set a maximum of 1000 numbers before running out of some digits.

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Answer:

A. Hydrosphere

Explanation:

Hydro means water and dolphins swim in water.

I hope this helps :)

The first two chemical equations are reversible while the other two are irreversible.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The reagents that would oxidize Fe to Fe2+ but not Sn to Sn2+ is Br2. This is because Fe has a lower reduction potential than Sn, which means it is easier to oxidize Fe than Sn.

However, Br2 has a higher oxidation potential than both Fe and Sn, which means it can oxidize Fe but not Sn. The reagent that would oxidize Ag to Ag+ but not Cl- to Cl2 is Ca2+. This is because Ca2+ has a lower oxidation potential than Ag, which means it cannot oxidize Ag. On the other hand, Cl- has a higher oxidation potential than Ca2+, which means it can be oxidized to Cl2. It is important to consider the reduction potential of the reagents and the elements involved to determine their oxidizing or reducing ability.
a) Br2 is the reagent that would oxidize Fe to Fe2+ but not Sn to Sn2+. This is because the reduction potential of Br2 is between those of Fe2+/Fe and Sn2+/Sn, making it strong enough to oxidize Fe but not Sn.

b) Co2+ is the reagent that would oxidize Ag to Ag+ but not Cl- to Cl2. The reduction potential of Co2+/Co is between those of Ag+/Ag and Cl2/Cl-, allowing it to oxidize Ag but not Cl-. Remember to check the standard reduction potentials table to determine the correct reagents for specific redox reactions.

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Water 3.0 deals mainly with sewage treatment. The primary aim of this project is to reduce the harmful impacts of chemical pollutants from industrial and agricultural activities on natural water resources.

Currently, used wastewater treatment technologies can break down some of the chemicals in wastewater but not all of them. Chemicals that are not broken down are referred to as persistent organic pollutants. These chemicals persist in the environment for long periods, and they can cause severe damage to aquatic life and human health.
Currently, the primary challenge facing water treatment technologies is the removal of persistent organic pollutants such as pesticides, pharmaceuticals, and endocrine-disrupting chemicals from wastewater.

These pollutants are generally water-soluble and resist microbial degradation, making them hard to remove from wastewater using current water treatment technologies. For example, conventional activated sludge treatment used in wastewater treatment plants does not remove some persistent organic pollutants from wastewater.
Failure to remove these pollutants from wastewater can have significant environmental and health impacts.

For example, pharmaceutical chemicals can cause antibiotic resistance, while endocrine-disrupting chemicals can cause birth defects, cancer, and other health problems.

Therefore, there is a need to improve wastewater treatment technologies to remove persistent organic pollutants from wastewater.
In conclusion, wastewater treatment technologies can break down some chemicals but not all. Chemicals that are not broken down are persistent organic pollutants and pose a significant risk to the environment and human health. Therefore, it is important to develop wastewater treatment technologies that can remove these pollutants from wastewater.

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Answer: The mass percent of copper in copper chloride is 47.23 %.

The pH of a solution can be calculated by using the following formula: pH = pKa + log([salt]/[acid]), Where,pKa = -logKa Acid = CH3COOH ([acid])Salt = CH3COO- ([salt]).

At 25 degrees Celcius, Ka of CH3COOH is 1.75x10^-5.pKa = -logKa = -log(1.75x10^-5) = 4.756pH = 4.756 + log([salt]/[acid]).

Since sodium acetate is derived from the reaction between acetic acid and sodium hydroxide (NaOH), [salt] can be calculated as [salt] = moles of sodium acetate / Total volume, Total volume = Volume of acetic acid (CH3COOH) = 0.0990L[salt] = (moles of sodium acetate) / (Total volume)= 0.02680mol / 0.0990L= 0.2701 M[salt] / [acid] = 0.2701 / 0.0198 = 13.63.

Hence, the pH of the solution is given by: pH = 4.756 + log([salt]/[acid])= 4.756 + log(13.63)= 6.78.

Therefore, the pH of the solution is 6.78.

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The correct formula of the molecule is C4H9O2.

The model of a compound is a representation of the molecule. It gives us an idea of what the molecule looks like as well as its molecular formula.

Looking at the structure of the compound as shown in the model in the question, the correct formula of the molecule is C4H9O2.

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Answer:C4H9O2.

Explanation:

Answer:

Physical changes occur when the properties of a substance are retained and/or the materials can be recovered after the change. Chemical changes involve the formation of a new substance. Formation of a gas, solid, light, or heat are possible evidence of chemical change.

brainliest???

Answer:

Physical changes occur when the properties of a substance are retained and/or the materials can be recovered after the change.

Explanation:

The area = 313.612 cm²

Force (F) can cause objects to move

While pressure (P)is the force per unit area

\(\tt P=\dfrac{F}{A}\)

weight=force=105 pounds(lb)⇒english units

pressure = 2.16 lb/in²

Thea are (A)

\(\tt A=\dfrac{F}{P}=\dfrac{105}{2.16}=48.61~in^2\\\\1~in^2=6,4516~cm^2\\\\48.61~in^2=313,612~cm^2\)

Answer:Plasma is highest energy state of matter.It consists of electrons,protons and neutral particles.

Explanation:(1) Plasma has a very high electrical conductivity .

(2) The motion of electrons and ions in plasma produces it's own electric and magnetic field

(3)It is readily influenced by electric and magnetic fields .

(4)It produces it's on electromagnetic radiations.



Diffusion takes place in the gas phase by the random motion of gas molecules. The thermal motion of gas particles at above absolute zero temperature is called molecular diffusion. Since, molecular diffusion occurs as a result of thermal motion of the molecules, it proceeds at a maximum rate in gases, at a lower rate in liquids, and at a still lower rate in solids.

The diffusion rate can be calculated by t=x²/(2D)

How to calculate the diffusion of gas at a particular distance?

Apply,

time= x²/(2D)

where

D= Diffusion constant = 10 ↑ -9 m²/s

x= distance =15 mm = 15 * 10↑-3 m

then, substitute

t= (15*10↑-3)²/2*10↑-9

=112.5 * 10↑ -3 sec

Thus, Diffusion of gas at a particular distance is

t =3.125* 10↑-5 hours

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Answer:

Definition and Mathematics of Work

Calculating the Amount of Work Done by Forces

Potential Energy

Kinetic Energy

Mechanical Energy

The weight percent of NaBr  in this solution is 150% and the mole fraction of NaBr in this solution will be 1.5.

Weight percent is a measure of the amount of solute (in this case, NaBr) in a solution relative to the total weight of the solution.

Weight percent (w/w) = (mass of solute / total mass of solution) x 100

In this case, the solution is 1.5 M NaBr, so we can calculate the mass of the solute:

mass of solute = molarity x molecular weight of solute

mass of solute = 1.5 M x 102 g/mol

mass of solute = 153 g

The total mass of the solution calculated as:

total mass = mass of solute / molarity

total mass = 153 g / 1.5 M

total mass = 102 g

Now we calculate the weight percent:

Weight percent (w/w) = (mass of solute / total mass of solution) x 100

Weight percent (w/w) = (153 g / 102 g) x 100

Weight percent (w/w) = 150%

The mole fraction of a solute is the ratio of the number of moles of the solute to the total number of moles in the solution.

The number of moles of NaBr can be calculated as:

number of moles of NaBr = mass of NaBr / molecular weight of NaBr

number of moles of NaBr = 153 g / 102 g/mol

number of moles of NaBr = 1.5 mol

And the total number of moles in the solution can be calculated as:

total number of moles = number of moles of NaBr / molarity

total number of moles = 1.5 mol / 1.5 M

total number of moles = 1.0 mol

Now we calculate the mole fraction:

Mole fraction = 1.5 mol / 1.0 mol

Mole fraction = 1.5

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Answer:

If you pass bromine vapour over hot iron, a similar but slightly less vigorous reaction happens, this time producing iron(III) bromide. Anhydrous iron(III) bromide is usually produced as a reddish-brown solid. Again the iron has been oxidised to an oxidation state of +3.

Explanation:

The correct option is b. Any water that, according to recognized standards, is safe for consumption

Potable water is water that is considered safe and suitable for human consumption according to recognized standards. This means that the water has been treated and tested to ensure that it is free from harmful contaminants and meets specific quality criteria for drinking water.

Potable water is typically treated to remove contaminants such as bacteria, viruses, parasites, chemicals, and other substances that may be harmful to human health. It is an essential resource for human health and well-being, and access to safe and reliable potable water is a basic human right. Therefore option b is right answer.

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mol CaCl₂ = 1.2 x 10²⁴ : 6.02 x 10²³ = 1.993

mass = 1.993 x 111 g/mol = 221.223 g

It is 221.223 grams of CaCl2.

mol CaCl₂ = 1.2 x 10²⁴

6.02 x 10²³ = 1.993

mass = 1.993 x 111 g/mol

= 221.223 g.

Suppose that for a sure test you need 3.00 moles of calcium chloride (CaCl2). on the grounds that calcium chloride is stable, it'd be convenient to use a balance to measure the mass that is wished. The molar mass of CaCl2 is 110.98 g/mol.

So if 1 mole of calcium chloride carries 6.022⋅10^23 components gadgets and has a mass of one hundred ten. ninety-eight grams, you can say that 6.022⋅1023 system gadgets of calcium chloride have a mass of 110.98 g .

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The Lewis structure of ammonia (NH3) is represented as:  H        H        H      NH2e-                1                  2                  3                   4  +NH3: : : Each line between the atoms represents a covalent bond, and each pair of dots represents a lone pair of electrons.

The structure that is the Lewis structure for ammonia (NH3) is a trigonal pyramid. It is also considered as the central atom with three outer atoms. This is a type of covalent bond that is present in nitrogen and hydrogen atoms in the ammonia molecule.

The Lewis structure is based on the octet rule which states that an atom wants to have 8 electrons in their outermost shell (in some cases, 2 electrons in their outermost shell for hydrogen) to achieve stability. The Lewis structure also shows the arrangement of atoms and bonds in a molecule. It helps to predict the geometry of the molecule and understand its properties.

To draw the Lewis structure of ammonia (NH3), we first need to count the total number of valence electrons in the molecule. Nitrogen has five valence electrons, and each hydrogen atom has one valence electron. So the total number of valence electrons in NH3 is 5+3(1) = 8 electrons. The nitrogen atom in NH3 is the central atom that is surrounded by three hydrogen atoms.

Nitrogen shares its three valence electrons with the three hydrogen atoms to form three covalent bonds. This results in a total of six electrons being used up, with two left over.The two remaining electrons form a lone pair on the nitrogen atom. The lone pair is responsible for the trigonal pyramid shape of the molecule.

The Lewis structure of ammonia (NH3) is represented as:  H        H        H      NH2e-                1                  2                  3                   4  +NH3: : : Each line between the atoms represents a covalent bond, and each pair of dots represents a lone pair of electrons.

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The wavelength of the spectral line produced when an electron in a hydrogen atom undergoes a transition from energy level n = 4 to energy level n = 2 is 486.1 nanometers.

The wavelength of the spectral line produced when an electron in a hydrogen atom undergoes a transition from energy level n = 4 to energy level n = 2 is 486.1 nm.

The formula for calculating the wavelength of a spectral line in a hydrogen atom is:

λ = 1/R(n1^2 - n2^2)

where:

λ is the wavelength in nanometers

R is the Rydberg constant, which is equal to 1.09677 * 10^7 m^-1

n1 is the initial energy level

n2 is the final energy level

In this case, n1 = 4 and n2 = 2. Substituting these values into the formula, we get:

λ = 1/(1.09677 * 10^7 m^-1)((4^2) - (2^2))

λ = 1/(1.09677 * 10^7 m^-1)(16 - 4)

λ = 1/(1.09677 * 10^7 m^-1)(12)

λ = 4.861 * 10^-7 m

λ = 486.1 nm

Therefore, the wavelength of the spectral line produced when an electron in a hydrogen atom undergoes the transition from energy level n = 4 to energy level n = 2 is 486.1 nm.

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