A boy found a solid metal box in his backyard. The box had been buried for so long, it was difficult to determine from what the box was made. The boy measured the box and found its volume (v) to be 17.63 cubic centimeters (cm3) and its mass (m) to be 158 grams (g). The boy knows the formula for density (D) is D = m/v. This table shows the density of several metals. DENSITY OF METALS *

A. copper
B. gold
C. silver
D. tin​

Answer:

light grey

Explanation:

cause it just got mixed

When mixed polycarboxylate cement is mixed correctly, it should have a syrup-like in consistency, which thickens as it sets.

One for the few dental fillings that exhibits real adherence to tooth structure is polycarboxylate cement. The liquid consists polyacrylic acid and a copolymer made from that acid, while the powder is predominantly zinc oxide. As filling substances, protective cavity lines, luting materials as crowns, bridges, inlays, and orthodontic appliances, as well as for root canal fillings and pulp capping, they are also employed in these procedures. When mixed polycarboxylate cement is mixed correctly, it should have a syrup-like in consistency, which thickens as it sets.

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Answer: combustion causes a chemical reaction between nitrogen and oxygen in the engine.

Explanation:

Nitrogen oxides are produced in combustion processes, partly from nitrogen compounds in the fuel, but mostly by direct combination of atmospheric oxygen and nitrogen in flames. Nitrogen oxides are produced naturally by lightning, and also, to a small extent, by microbial processes in soils.

Answer:

when fuels are burned in vehicle engines high temperatures are reached. at these high temperature nitrogen and oxygen from the air combine to produce nitrogen

Answer:

Loose Material is compacted by pressure.

The amount of heat evolved by a reaction is, 53.84 kJ

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water

q = [q1 + q2]

q = [c1× ∆T]+[m2×c2×∆T]

where,

q = heat released by the reaction

q1 = heat absorbed by the calorimeter

q2 = heat absorbed by the water

c1 = specific heat of calorimeter = 600 j/g°c

c2 = specific heat of water = 4.184 j/g°c

m2 = mass of water = 500 g

∆T = change in temperature = 20°c

Now put all the given values in the above formula, we get:

q = (600×20) + (500×4.184×20)

q = 12000 + 41840

q = 53840 J

q = 53.84 kJ

Therefore, the amount of heat evolved by a reaction is, 53.84 kJ

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Answer:

cd

Explanation:

that's better

Answer:

D: Fe + Cu(NO3)2 ->.

Worked for me on EG 2023

Answer:

your answer is 769

Explanation:

i took the test lol

The pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature, according to Gay Lussac's Law. When you heat a gas, the molecules gain energy and move faster. This means more impacts on the container's walls and an increase in pressure.

The temperature  at 565 torr = 276.5 K  

The temperature = \(\frac{565 X 318.15}{650}\) =276.5 K  

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Deciding whether or not to approve a mortgage Future changes in consumer purchase tendencies can be predicted using classification models.

A mortgage is a kind of loan used to buy or keep up real estate, such as a home, piece of land, or other construction. The borrower agrees to make a series of monthly payments, divided into principal and interest, to the mortgage lender. This frequently emerges as a succession of regular, weekly episodes. After then, the asset is forfeited as loan collateral.

Borrowers are need to fill out an application with their selected lender and fulfill a number of criteria, such as down payments and minimum credit scores. Before going on to the closing stage, mortgage applications must pass a stringent underwriting procedure.

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Answer:

I think it's C. Animals add water vapor to the air through respiration

Explanation:

The pH of the solution prepared by dissolving 8.00 g of NaOH in 5.00 L of water is 12.598.

It is evident that from the given information, 8.00 g of NaOH (which is a strong base) has been dissolved in 5.00 L of water. So to calculate the pH of a solution we can use the formula:

m = n / M.                     Given :

n = 8.00 g / 40.00 g/mol = 0.200 mol

M = 40.00 g/mol

m = 0.200 mol / 5.00 L = 0.04 mol/L

By knowing  the concentration of hydroxide ions, we can use the relationship:

[OH-] = 10^(-14) / [H+]

pH = -log[H+]

The product of [H+] and [OH-] is always equal to 10^(-14) at 25 degree Celsius. Hence,

[H+] * [OH-] = 10^(-14)

[OH-] = 10^(-14) / [H+]

Substituting the value of [OH-] in the above equation.

pH = - log(10^(-14) / 0.04 ) =

pH = - log(2.5*10^(-13)) =

Therefore, the pH of the solution is 12.598.

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159.77kJ

Given the balanced chemical reaction between carbon C(s) and SO2(g) expressed as:

First, we need to get the number of moles of Carbon present using the formula;

According to the reaction, 5 moles of carbon reacts to produce 239.9 kJ of heat.

To determine how much heat will be produced by 3.33 moles of Carbon, this will be expressed as:

Hence the amount of heat absorbed when 40.00 g of C( s) reacts in the presence of excess SO 2( g) to produce CS 2( l) and CO(g) is 159.77kJ

The largest number of moles of chloride ions are in 100ml of 0.3M AlCl3.

The moles is calculated as

molarity= moles/ molecular weight×100

moles of AlCl3= 0.1×0.3×133.34

= 4 mole where there are 3 chloride ion so it will be 12 moles.

Moles of MgCl2= 0.05× 0.6× 95.21

= 2.85 equivalent to 3moles where 2 chloride ion so it will be

Moles of NaCl =0.2× 0.4 ×58.5

= 4.67 where there are 1 chloride ion so it will be 4.67.

Mole is a measure of the number of substances and molarity is a measure of concentration. Molarity indicates the amount of substance present in a mixture. Molarity is given as the moles of substance in the volume of solvent. A mole is a unit, but a molarity is not.

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The 5 basic horse coat colors are bay, black, chestnut, gray, and white.

Bay horses have a reddish-brown body with black points, which include the mane, tail, and lower legs. Black horses have a solid black body with no brown or white markings. Chestnut horses range from a light reddish-brown to a dark liver color, and they have a mane and tail that match their body color. Gray horses are born with a solid coat color, but over time, they develop white hairs that gradually spread throughout their body, giving them a gray appearance. White horses have a pure white coat with pink skin and blue or brown eyes.

Although these are the basic coat colors, there are many variations and combinations of colors within each category. For example, a bay horse can be a dark bay, a blood bay, or a bright bay, depending on the shade of red in its coat.

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Molecules in 4 moles of glucose are 24.088x10²³.

We need to find the number of molecules by applying the concept of moles

number of moles(n)= Number of Molecules(N)/Avogadro's Number(Nₐ)

n=N/Nₐ

4=N/6.022x10²³

N=24.088x10²³

Therefore, the number of molecules in 4 moles of Glucose is 24.088x10²³.

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Answer:

the conjugate base of the compound is

C6h6O2/6-

Explanation:

subscript

The conjugate base of \(\rm HC_6H_6O_6^-\; is \; C_6H_6O_6^-\).

Conjugate acid is the acid that donates a hydrogen ion to a base, conjugate acid contains a hydrogen ion.

The base that gains a hydrogen ion from a conjugate acid is called the conjugate base.

The acid is NH4 converts into a conjugate base NH3-

When a conjugate acid donates a hydrogen ion, it converts into the conjugate base.

Thus, the conjugate base is \(\; C_6H_6O_6^-\)

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The steps to make chocolate so that it does not melt on my hands are: heat the chocolate up to 120 degree fahrenheit and then after removing the bowl cool down it below 80 degree fahrenheit.

The main reasons to temper chocolate are:

1. Tempered chocolate is firm and solid in nature at room temperature. This is critical when making the chocolate confections or decorations. Chocolate which is out of temper requires refrigeration to maintain its shape.

2. The appearance of tempered chocolate is much better than that of its un-tempered counterpart. Tempered chocolate is smooth in nature , shiny and evenly colored.

3. Chocolate that is not been tempered has a distinctly dull appearance and may develop fat bloom -- grayish-white spots on the surface of the chocolate where unstable beta crystals have gathered.

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The energy required to take a 15. 0-g sample of ice at −15. 0 °c to liquid water at 45. 0 °c is 3767.4 Joules.

Heat capacity or thermal capability is a physical property relying on, described as the amount of heat to be provided to an object to produce a unit trade in its temperature. The SI unit of heat ability is joule in line with kelvin. warmth capability is an extensive belonging.

Heat energy = msΔT

                     = 15 ×  4.186 × (45°C - (-15°C)

                     = 15 ×  4.186 × (60)

                      = 3767.4 Joules

Heat capacity or specific warmth is the quantity of warmth in step with unit mass that is required to raise the temperature through 1°C. particular heat is helpful in determining the processing temperatures and quantity of warmth necessary for processing and can be useful in differentiating among polymeric composites.

Energy is a quantitative property given to a body or physical system and can be identified as work being done in the form of heat and light. Energy is Conserved - The law of conservation of energy states that energy can be transformed into form, but cannot be created or destroyed.

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The balanced chemical equation for the reaction of oxygen gas and MnO2 is:
2MnO2 + O2 → 2MnO3. The molar mass of O2 is 32 g/mol, therefore 4.3 kg of O2 is equal to 134.375 moles of O2. Since the reaction requires 1 mole of O2 to produce 2 moles of MnO3, the number of moles of MnO3 produced is 67.1875 moles.

The given balanced chemical equation is 2MnO2 + O2 → 2MnO3.The molar mass of O2 is 32 g/mol. Therefore, 4.3 kg of O2 is equal to (4.3 × 1000 g/kg) / (32 g/mol) = 134.375 moles of O2.The balanced equation has a 1:2 ratio of O2 to MnO3. Therefore, 1 mole of O2 produces 2 moles of MnO3. So, the number of moles of MnO3 produced is 67.1875 moles.

The given balanced chemical equation is 2MnO2 + O2 → 2MnO3. The molar mass of O2 is 32 g/mol. Therefore, 4.3 kg of O2 is equal to (4.3 × 1000 g/kg) / (32 g/mol) = 134.375 moles of O2. The balanced equation has a 1:2 ratio of O2 to MnO3. Therefore, 1 mole of O2 produces 2 moles of MnO3. So, the number of moles of MnO3 produced is 67.1875 moles.

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Answer:

Using the formula cards again, add the coefficient of 2 in front of the formula and have them recalculate the number of each element and the total number of atoms in each element.

Explanation:

The number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

A compound is a substance that is a mixture of more than one elements.

Compounds are made of two or more elements. These elements are represented by their symbols. These symbols can be identified and the number of elements represented by these symbols are counted.

For example, in the compound \(H_2O\):

H represents Hydrogen

O represents Oxygen

The elements in Water ( \(H_2O\)) are Hydrogen and Oxygen

Therefore, the number of elements in  \(H_2O\) is 2

Also in, \(NaCl\)

The elements are Sodium(Na) and Chlorine(Cl)

There are two elements in NaCl

Hence, the number of elements in a compound is counted by identifying and counting the chemical symbols represented in the chemical formula

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Answer:

1/3p0

Explanation:

The combined gas law:

P1V1/T1 = P2V2/T2, where P, V and T are Pressure, Volume, and Temperature.  Temperature must always be in Kelvin.  The subscriopts 1 and 2 are for initial (1) and final (2) conditions.

In this case, temperature is constant (adiabatically). V1 = 2.0L and V2 = 6.0L.  I'll assume P1 = p0.

Rearrange the combined gas law to solve for final pressure, P2:

P1V1/T1 = P2V2/T2

P2 = P1*(V1/V2)*(T2/T1)  [Note how I've arranged the volume and temoperature terms - as ratios.  This helps us understand what the impact of raising or lowering one on the variables will do to the system].

No enter the data:

P2 = P1*(V1/V2)*(T2/T1):  [Since T2 = T1, the (T2/T1) terms cancels to 1.]

P2 = p0*(2.0L/6.0L)*(1)

P2 = (1/3)p0

The final pressure is 1/3 the initial pressure.

Answer:

I think it is lightning

Explanation:

Lightning creates an electricity and it has lots of energy, so I think that it is lightning

Answer:

Good morning as well! The answer to this question is lightning.

Explanation:

Lightning is a source of electrical energy. Lightning also has a certain amount of voltage. Frozen raindrops bump into each other in the air causing an electrical charge. Therefore, lightning is created.

Question :—

1. Calculate the mass percent of salt in salt water if 1 gram of salt is dissolved into 99 grams of water. Show the steps in your calculation.

Answer :—

Mas of common salt (solute)=1 g

Mas of common salt (solute)=1 Mass of water (soluted) =99 g

Mas of common salt (solute)=1 gMass of water (soluted) =99 gmass of solution =1+99 = 100

gconcentration of solution= mass of solution (M mass of solute) ×100 \( = > \frac{1}{100} \times 100\)

=> 1% \)Hence, the concentration of the solution is 1%

The  mass percent of salt in salt water if 1 gram of salt is dissolved into 99 grams of water is 1%.

The way of expressing a concentration is mass percent. Moreover, it describes the component in a particular mixture. The solution composition can be understood in a mass percentage. It shows the mass of solute present in a given mass of solution. The quantity of solute is expressed in mass or by moles.

The mass percent may be a way of expressing a degree. Moreover, it describes the component during a particular mixture. The solution composition is often described in mass percentage. It shows the mass of solute present during a given mass of solution. The number of solutes is expressed in mass or by moles.

Percentage of mass = (solute’s mass ÷ mass of solution) x 100%, substitution of values gives 1/100×100=1%.

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The carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burns hydrogen to helium in their cores.

In high-mass main-sequence stars, such as massive stars with a mass greater than about 1.5 times that of the Sun, the primary nuclear reaction that powers their cores is the carbon-nitrogen-oxygen (CNO) cycle. This cycle converts hydrogen nuclei (protons) into helium nuclei (alpha particles) through a series of fusion reactions.

The CNO cycle involves the catalytic action of carbon, nitrogen, and oxygen isotopes. In the first step of the cycle, a proton fuses with a carbon-12 nucleus to produce nitrogen-13 and release a gamma ray. Nitrogen-13 then undergoes beta decay, converting a proton into a neutron and transforming into carbon-13. Carbon-13 can capture another proton, forming nitrogen-14. Nitrogen-14 can further undergo fusion reactions with other protons to produce oxygen-15 and eventually return back to carbon-12, completing the cycle.

Overall, the CNO cycle allows high-mass main-sequence stars to convert hydrogen into helium, releasing energy in the process and sustaining the star's energy production.

What elements does the carbon-nitrogen-oxygen (CNO) cycle in high-mass main-sequence stars burn in their cores?

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Answer:

0.736

Explanation:

*I am not sure what you mean by "carbon tetrahedral". I'm assuming you are just referring to individual carbon.*

To find the mole percent, you need to (1) convert grams benzene and grams carbon to moles (via their molar masses) and then (2) calculate the mole fraction (via the mole fraction formula).

(Step 1)

Benzene = C₆H₆

Molar Mass (C₆H₆) = 6(12.01 g/mol) + 6(1.008 g/mol)

Molar Mass (C₆H₆) = 78.108 g/mol

70 g C₆H₆          1 mole
---------------  x  ------------------  =  0.896 mole C₆H₆
                         78.108 g

Molar Mass (C) = 12.01 g/mol

30 g C           1 mole
------------  x  -----------------  =  2.50 mole C
                       12.01 g

(Step 2)

                                           moles solute
Mole Fraction  =  ----------------------------------------------
                              moles solute + moles solvent

                                              2.50 mole C
Mole Fraction  =  -------------------------------------------------  =  0.736
                             (0.896 mole C₆H₆ + 2.50 mole C)

Answer:

microbiology

Explanation:

Answer:

I forgot dude sorry so sorry

Answer:

255 grams of ammonia

Explanation:

To solve this problem, we need to use the balanced chemical equation for the reaction between ammonia and water:

NH3 + H2O → NH4+ + OH-

From this equation, we can see that one molecule of ammonia reacts with one molecule of water to produce one hydroxide ion (OH-) and one ammonium ion (NH4+). Therefore, we need the same number of molecules of ammonia as water to form the products.

So, if we have 9.09X^23 molecules of water, we need the same number of molecules of ammonia:

9.09X^23 molecules of NH3

To calculate the mass of ammonia required, we need to use the molar mass of ammonia, which is approximately 17 g/mol:

1 mol of NH3 = 17 g

To convert the number of molecules of NH3 to grams, we need to use Avogadro's number:

1 mol = 6.022 × 10^23 molecules

Therefore, the mass of ammonia required is:

9.09X^23 molecules of NH3 * (1 mol/6.022 × 10^23 molecules) * 17 g/mol

= 2.55 × 10^2 g or 255 grams (rounded to two significant figures)

So, we need 255 grams of ammonia to form 9.09X^23 molecules of water.

The inside of a cell, what is meant when the surrounding solution is is called hypertonic solution.

What is hypertonic solution?

When a cell is immersed in a hypertonic solution, there is a net flow of water out of the cell, resulting in volume loss. A solution is hypertonic to a cell if its solute concentration exceeds that of the cell, and the solutes are unable to penetrate the membrane.

A hypertonic solution is a solution that has a higher concentration of solutes on the exterior of a cell than on the inside of a cell.

A hypertonic solution has a higher osmotic pressure than another solution. In other terms, a hypertonic solution has a higher concentration or quantity of solute particles outside a membrane than inside it.

The traditional example used to describe tonicity is red blood cells. When the concentration of salts (ions) inside the blood cell is the same as the concentration outside, the solution is isotonic with respect to the cells, and they resume their usual form and size.

If there are less solutes outside the cell than inside it, as if red blood cells were placed in fresh water, the solution (water) is hypotonic in comparison to the interior of the red blood cells. As water rushes into the cell to try to equalise the concentrations of the interior and outer solutions, the cells enlarge and may explode.

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Potential difference is the anode positive or negative in a galvanic cell.

In a galvanic cell, the anode is negative. The anode is an electrode where oxidation occurs, meaning electrons are lost. The oxidation process causes a buildup of positive ions, making the anode negatively charged.

The other electrode in a galvanic cell is called the cathode, and it is positive. Reduction occurs at the cathode, meaning electrons are gained. The reduction process causes a decrease in the concentration of positive ions, making the cathode positively charged.

Therefore, there is a potential difference between the anode and the cathode, and electrons flow from the anode to the cathode through an external circuit, creating an electrical current.

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Answer:

An intermolecular force is the force of attraction or repulsion which act between neighboring particles (atoms, molecules, or ions). Whereas the covalent bonds are the interatomic linkage that results from the sharing of an electron pair between two atoms.

Intermolecular forces hold molecules together in a liquid or solid. Intermolecular forces are generally much weaker than covalent bonds.

Answer

Provide the body with the calories, or energy, to grow as well.