100 POINTS - A sample of crushed rock is found to have 4. 81 x10^21 atoms of gold, how many moles of gold are present in this sample? SHOW WORK INCLUDING FORMULA : THANK YOU

Answer : The correct option is, (B) has fewer subatomic particles than an atom of iron (Fe) .

Explanation :

The given element is chromium (Cr). The atomic number of chromium is 24.

As we know that the atomic number is either equal to the number of protons or number of electrons.

So, Atomic number = Number of protons = Number of electrons = 24

And we know that mass number is the sum of number of protons and number of neutrons.

Mass number of chromium = 52

Mass number = Number of protons + Number of neutrons

52 = 28 + Number of neutrons

Number of neutrons = 28

And we know that the atomic number of iron (Fe) is 26.

Number of protons = Number of electrons = 26

Mass number of Fe = 56

Number of neutrons = 30

From the given options we conclude that the a neutral atom of chromium has fewer subatomic particles than an atom of iron (Fe).

Hence, the correct option is, (B) has fewer subatomic particles than an atom of iron (Fe) .

Answer:

1.) The property by the virtue of which the metals can be beaten into sheets.

Malleability

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the area of one of the cat's paws is 4 square centimeters.

The weight of the cat is 4.0 kilograms, which is the force exerted on the scale by the cat's body. The weight per unit area on the scale due to the cat's paws is 0.25 kilograms per square centimeter.

Let A be the area of one of the cat's paws in square centimeters. The weight of the cat is supported by all four paws, so the total force exerted by the paws on the scale is:

force = weight = 4.0 kg

The force exerted by one paw is one-fourth of the total force:

force per paw = force / 4 = 4.0 kg / 4 = 1.0 kg

This force is distributed over the area of one paw, so we can write:

pressure = force per paw / A

where pressure is the weight per unit area, which is given as 0.25 kg/cm

Substituting the values and solving for A, we get:

0.25 kg/cm = 1.0 kg / A

A = 1.0 kg / 0.25 kg/cm = 4 cm

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Among the three companies, Company A has the highest acid-test ratio (2.67), followed by Company B (2.00), and then Company C (1.75). The higher the acid-test ratio, the better the company's ability to meet short-term obligations without relying on inventory sales. Therefore, Company A is in the best position to meet short-term obligations.

To compute the acid-test ratio (also known as the quick ratio) for each company, we'll use the formula:

Acid-Test Ratio = (Current Assets - Inventory) / Current Liabilities

a. Compute the acid-test ratio for each company:

Company A:

Current Assets = $250,000

Inventory = $50,000

Current Liabilities = $75,000

Acid-Test Ratio for Company A = ($250,000 - $50,000) / $75,000

Acid-Test Ratio for Company A = $200,000 / $75,000

Acid-Test Ratio for Company A ≈ 2.67

Company B:

Current Assets = $150,000

Inventory = $30,000

Current Liabilities = $60,000

Acid-Test Ratio for Company B = ($150,000 - $30,000) / $60,000

Acid-Test Ratio for Company B = $120,000 / $60,000

Acid-Test Ratio for Company B = 2.00

Company C:

Current Assets = $300,000

Inventory = $90,000

Current Liabilities = $120,000

Acid-Test Ratio for Company C = ($300,000 - $90,000) / $120,000

Acid-Test Ratio for Company C = $210,000 / $120,000

Acid-Test Ratio for Company C = 1.75

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The following statements on HPLC modes are true is more polar compounds elute first in normal-phase HPLC (Option E).

The liquid chromatography (HPLC) is a technique in analytical chemistry employed for the separation, identification, and quantification of elements. It is considered a highly sensitive method, and it works by separating the components in a mixture with the assistance of a solvent under high pressure.

There are two modes of HPLC: Reversed-Phase HPLC (RP-HPLC) and Normal-Phase HPLC (NP-HPLC). In RP-HPLC, a nonpolar stationary phase, such as C18, is used, and polar solvents, such as water, are used as mobile phases. Polar stationary phases, such as silica gel, are used in NP-HPLC, while nonpolar solvents, such as hexane, are used as mobile phases.

More polar compounds have a greater affinity for the polar stationary phase than less polar compounds, which have a higher affinity for the nonpolar mobile phase in NP-HPLC. As a result, less polar compounds elute first in normal-phase HPLC.

Thus, the correct option is E.

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The loss of two electrons causes the atom to have a net positive charge of two.

In order to reach the n=2 energy level and an octet of electrons in the outermost shell, oxygen, which has an electron configuration of (2, 6), must gain two electrons.

When an atom has an equal amount of protons and electrons, it also has an equal number of electric charges, both positive and negative (the electrons) (the protons). The atom is referred to as neutral since its overall electric charge is zero.

When electrons are added to or taken away from an object, an electrical charge is produced. An object acquires a negative charge when electrons are introduced to it because electrons have a negative charge. An object acquires a positive charge when its electrons are removed.

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AgI will form in addition to the existing AgCl.

The addition of ammonium chloride solution to the silver-containing solution results in the formation of AgCl due to the reaction between silver ions and chloride ions. The reaction is given as follows:

Ag⁺ + Cl⁻ → AgCl

Next, the addition of potassium iodide solution to the same solution results in the formation of AgI due to the reaction between silver ions and iodide ions. The reaction is given as follows:

Ag⁺ + I⁻ → AgI

Since both reactions involve the same reactant (Ag⁺), the formation of AgI will occur simultaneously with the dissolution of AgCl. However, the extent of the dissolution of AgCl will depend on the solubility product of AgCl and the concentration of Ag⁺ ions in solution.

If the concentration of Ag⁺ ions in solution is high enough to exceed the solubility product of AgCl, then AgCl will dissolve completely to form Ag⁺ ions and Cl⁻ ions. In this case, the formation of AgI will occur in addition to the existing Ag⁺ ions in solution.

If the concentration of Ag⁺ ions is not high enough to exceed the solubility product of AgCl, then the formation of AgI will accompany the dissolution of AgCl until the concentration of Ag⁺ ions is high enough to exceed the solubility product of AgCl.

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Answer:

pH= 14.17

pOH= -0.17

[H3O+]= 6.76x10^-15M

[OH-]= 1.5M

Explanation:

1st) It is necessary to write the dissociation equation:

From the equation we can see that from 1 mole of Al(OH)3, 3 moles of OH- are dissociated. So, in this case, from the 0.5M solution, 1.5M of OH- will be produced (3x0.5M=1.5M).

We know that the concentration of OH- is [OH-]= 1.5M.

2nd) With the [OH-] we can calculate the pOH of the solution:

The pOH is -0.17.

3rd) Now we can calculate the pH of the solution:

The pH is 14.17.

4th) Finally, we can calculate the concentration of H+:

So, the concentration of H+ is 6.76x10^-15M.

Reduce the burning of fossil fuels by using electrical vehicles and instruments is the only solution to stop climate change.

Climate change is a process which occurs due to the release of greenhouse gases such as methane and carbondioxide gases. When fossil fuel is burn, it releases energy along with carbondioxide gas which blocks the escape of solar radiation.

This blockage leads to the warming of surface temperature. So if we switched to electrical vehicles instead of conventional vehicles, this climate change can be stopped.

So we can conclude that reduce the burning of fossil fuels by using electrical vehicles and instruments is the only solution to stop climate change.

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We can reduce the effects of global warming by reducing the release of greenhouse gases such as CO2

The term climate change has to do with the gradual changes that occur in our atmosphere as a result of the emission of greenhouse gases into the atmosphere. These greenhouses gases include; methane, CO2, water vapor and N2O.

These gases are able to redirect the infrared rays that ought to escape the atmosphere back to the earth surface thereby leading to a gradual rise in the temperature of the earth called global warming.

Global warming leads to certain effects such as flooding and the melting of the polar ice caps.

We can reduce the effects of global warming by reducing the release of greenhouse gases such as CO2 by eliminating the use of fossil fuels and producing electric vehicles.

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Answer:

I see "photosynthesis" and "cellular respiration". I wonder if photosynthesis has something to do with the sun.

Explanation:

Answer:

Equilibrium shifts left making more NO2

Explanation:

In Le Chatlier's Principle,  increase in volume  shifts equilibrium to side with more moles so... there's 2 moles on left and 1 mole on right, so equilibrium shifts to left making more NO2

According to chemical equilibrium and Le-Chatlier's principle , the equilibrium will shift to left with increase in concentration of NO₂.

Chemical equilibrium is defined as the condition which arises during the course of a reversible chemical reaction with no net change in amount of reactants and products.A reversible chemical reaction is the one wherein the products as soon as they are formed react together to produce back the reactants.

At equilibrium, the two opposing reactions which take place take place at equal rates and there is no net change in amount of the substances which are involved in the chemical reaction.At equilibrium, the reaction is considered to be complete . Conditions which are required for equilibrium are given by quantitative formulation.

Factors which affect chemical equilibrium are change in concentration , change in pressure and temperature and presence of catalyst.

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Through stomata....

hope it's helpful :)

Answer:

Endothermic , this is correct answer

Answer:

The answer will result in one significant digit.

Explanation:

1. Subtract:

     12.1 - 12.004 = 0.096

2. ROund to the correct number of significant digits:

      For addition and subtraction we round the sum or the difference to the least number of digits after the decimal point there are in the problem.  

      For example, SInce 12.1 has one number after the decimal point and 12.004 has three numbers after the decimal point, we round the answer to one number after the decimal point because 12.1 is the number in the problem which has the least amount of digits after the decimal point.

     We round 0.096 to 0.1.

     0.1 has one significant digit.

Specific heat capacity is a property of a substance that represents the amount of energy required to raise the temperature of one gram of that substance by one degree Celsius.

In other words, it tells us how much heat a substance can absorb or release without changing its temperature. Here is a step-by-step explanation:

1. Identify the substance and its specific heat capacity (usually given in units of J/g°C or cal/g°C).

2. Determine the mass of the substance (in grams) and the desired temperature change (in degrees Celsius).

3. Use the formula: Q = mcΔT, where Q is the heat energy absorbed or released, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

4. Solve the equation for Q to find the amount of energy required or released for the given temperature change.

Remember, specific heat capacity values are unique to each substance and help us understand how different materials react to changes in temperature.

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Stars are made of mostly hydrogen and helium, held together by the Sun.

Are stars mostly made of hydrogen and helium?

Massive celestial objects called stars, which are primarily composed of hydrogen and helium, generate light and heat from the churning nuclear forges inside their cores. The other flecks of light we see in the sky, besides our sun, are all light-years away from Earth.

What holds a star together?

The process responsible for a star's luminosity is known as nuclear fusion. The pull of gravity is resisted by the hot gas as it pushes outward. A star is created by this harmony of forces. It maintains the star's structural integrity and maintains its temperature throughout the majority of its lifespan.

What causes stars to group together?

The majority of stars in the Milky Way are found in pairs or clusters of multiple stars, which is consistent with predictions made by three-dimensional computer models of star formation that the collapsing spinning clouds of gas and dust may split into two or three blobs.

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Answer:

B

Explanation:

The more energy levels that are occupied by electrons, the larger

the atomic radius.

The more energy levels that are occupied by electrons, the larger

the atomic radius. Hence, option B is correct.

The atomic radius is calculated by measuring the distance between the nuclei of two identical atoms bonded together.

In general, the atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remain constant.

Hence, the observed trend in atomic radius as you move down is that the more energy levels that are occupied by electrons, the larger

the atomic radius.

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(B) 2-methylbut-2-ene. 2-methylbut-2-ene, can be polymerized to form longer chain polymers through addition reactions with other alkene molecules.

2-Methylbut-2-ene is an alkene hydrocarbon molecule with the chemical formula C5H10. It comprises a carbon skeleton with five carbon atoms and 10 hydrogen atoms. The molecule contains a double bond between the second and third carbon atoms and a methyl group (-CH3) attached to the second carbon atom.

Polymerization is the process of forming long chains of repeating units, called polymers, from smaller molecules, known as monomers. The process involves the covalent bonding of monomers through addition reactions.

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The empirical formula of the compound is BF3.

The empirical formula of a compound is the simplest whole-number ratio of atoms that represents the compound's composition. To determine the empirical formula of a compound, we need to determine the number of moles of each element present and then simplify the ratio of moles to the smallest whole-number ratio.

First, we can use the percentages of boron and fluorine to find the number of grams of each element present in 100 grams of the compound:

15.94 g boron / 100 g compound

84.06 g fluorine / 100 g compound

Next, we can convert the number of grams of each element to moles using the molar masses of boron and fluorine:

15.94 g B / (10.81 g/mol) = 1.48 mol B

84.06 g F / (18.99 g/mol) = 4.44 mol F

To find the empirical formula, we divide the number of moles of each element by the lowest number of moles:

1.48 mol B / 1.48 mol B = 1.00

4.44 mol F / 1.48 mol B = 3.00

So the empirical formula of the compound is BF3.

It's important to note that this is the empirical formula, and the actual formula of the compound could be a multiple of this depending on the chemical structure of the compound.

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In the following chemical reaction, the solution was supplemented with 8.01g of magnesium sulfate.

We must utilize the following chemical formula to determine how magnesium sulfate and sodium hydroxide react to solve this issue:

MgSO4 + 2 NaOH → Mg(OH)2 + Na2SO4

One mole of magnesium sulfate (MgSO4) interacts with two moles of sodium hydroxide (NaOH), resulting in one mole of magnesium hydroxide (Mg(OH)2) and one mole of sodium sulfate, according to the equation (Na2SO4).

We must utilize the solution's concentration and volume to determine how many moles of NaOH are present in the solution:

C = n/V

where n is the number of moles, V is the volume in liters, and C is the concentration in moles per liter.

n(NaOH) = C × V

               = 1 mol/L × 0.133 L  

               = 0.133 mol.

We require half as many moles of MgSO4 as we do of NaOH since their mole ratio is 1:2:

n(MgSO4) = 0.5 × n(NaOH)

                 = 0.5 × 0.133 mol

                 = 0.0665 mol

Using its molar mass, we can finally translate the quantity of MgSO4 from moles to grams:

m(MgSO4) = n(MgSO4) × M(MgSO4)

                  = 0.0665 mol × 120.4 g/mol = 8.01 g

Therefore the solution was supplemented with 8.01g of magnesium sulfate.

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Answer:

Sodium hydroxide is very corrosive. It can cause irritation to the eyes, skin, and mucous membrane; an allergic reaction; eye and skin burns; and temporary loss of hair. Workers may be harmed from exposure to sodium hydroxide.

Explanation:

How to reduce:

Inhalation: Move victim to fresh air.

Skin Contact: Avoid direct contact

Eye Contact: Avoid direct contact

Ingestion: Have victim rinse mouth with water.

The pH of a solution is calculated using the formula; pH = - log[H+] and water has a pH of 7.

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution.

Where

For example, the pH of a 0.1 M HCl solution is calculated as follows:

[H+] of HCl = 1 × 10^-1

pH = - log (1 × 10^-1)

pH = 1

Water is a neutral solution. It has pH of 7.

Therefore, the pH of a solution is calculated using the formula; pH = - log[H+] and water has a pH of 7.

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Answer:

First one is 1, then +2 for the rest.

Explanation:

0.1 M HCI = 1

0.001 M HCI = 3

0.00001 M HCI = 5

Distilled water = 7

0.00001 M NaOH = 9

0.001 M NaOH = 11

0.1 M NaOH = 13

I got it wrong so ya'll could get it right x3

To combine ions to form ionic compounds, we need the combine in such a way that it gets neutral charge.

We can combine each anion with each cation to get the 4 compounds we need.

To combine SO₄²⁻ with Pb⁴⁺ we first find the Least Common Multiple of their charges, 2 and 4.

They have the factor 2 in common, so the LCM is 4. This is the final charge of each that will cancel out.

To get 4+, we only need 1 Pb⁴⁺.

To get 4-, we need 2 SO₄²⁻.

So, the formula is:

Pb(SO₄)₂

To combine SO₄²⁻ with NH₄⁺ is easier because one of them has single charge. In this case, we can simply pick one of the multiple charge ion and the same amount that will cancel its charge of the single charged one.

So, we picke 1 SO₄²⁻, ending with 2-.

And we picke 2 NH₄⁺, ending with 2+.

The formula:

(NH₄)₂SO₄

To combine C₂H₃O₂⁻ with Pb⁴⁺ we do the same, because the anion is single charged.

Pick 1 Pb⁴⁺, ending with 4+.

Pick 4 C₂H₃O₂⁻, ending with 4-.

The formula:

Pb(C₂H₃O₂)₄

To combine C₂H₃O₂⁻ with NH₄⁺, both have same charge, so we just need one of each and their charges will cancel out.

The formula:

NH₄C₂H₃O₂

So, the formulas are:

Pb(SO₄)₂

(NH₄)₂SO₄

Pb(C₂H₃O₂)₄

NH₄C₂H₃O₂

Answer:

actually it depends on when and on what you had the finger print it could stay a couple of days, weeks or months and still be considered fresh

Moles of viruses have a mass equal to the mass of an oil tanker is equal to 5.55 moles and the mass of 1 mole of viruses =  5.4 × 10 ⁹ g

Any species with 1 mole = 6.022 × 10²³ atoms .

Therefore ,1 mole of virus mass = 9 × 10⁻¹² × 10⁻³ g × 6.022 × 10 ²³

                                                            = 5.4 × 10 ⁹ g

2. Let n moles virus mass be = 3 × 10⁷ kg

                                          = 3 × 10¹⁰ g

               n × 5.4 × 10⁹ = 3 × 10¹⁰

                  n = 5.55 mole

The mole is the unit of measure of substance in the Worldwide Arrangement of Units. The amount measure of substance is a proportion of the number of rudimentary elements of a given substance that are in an item or test. The mole is characterized as precisely 6.02214076×10²³ rudimentary substances

The mole is a SI unit that connects the minute and plainly visible world. It lets scientists measure a lot of very small things, like atoms or molecules, in huge quantities. In the beginning, the units "gram-atom" and "gram-molecule" were used to describe the quantities of chemical elements or compounds.

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Answer:

6= 2 Na ,1 Cl2-> 2 NaVl

7= 1 N2 + 3 H2= 2 NH3

8= 2 H2O = 2 H2+ 1 O2