(c) A sample of rust had the following composition:
51.85g of iron
22.22g of oxygen
16.67 g of water.
Calculate the following and then write the formula for this sample of rust.
number of moles of iron atoms, Fe =
number of moles of oxygen atoms, O =
number of moles of water molecules, H₂O =
simplest mole ratio Fe: O: H₂O is ........
formula for this sample of rust is
.......:

Answer:

V = 4/3 * 3.1416 * (37x10-10)3

V = 2.12x10-25 cm3

d = m/V

d = 1.67x10-24 / 2.12x10-25 = 7.87 g/cm3

The difference in temperature, let's convert F to ºC:

ºC = -80-32/1.8 = -62.22 ºC

dT = -92.6 + 62.2 = -30.4 ºC

The number of hydrogen atoms lined up side to side to make 1.00 inch is equal to 3.43 × 10⁷ atoms when the radius of one H-atom is 37 pm.

The atomic radius of a hydrogen atom is the distance between the center of the nucleus to the boundary of the electron that surrounds it.

Given, the radius of the hydrogen atom = 37pm

Then the diameter of the hydrogen atom = 37 + 37 = 74 pm

We know that 1 pm = 10⁻¹¹ m

Then the diameter of the one H - atom =  74 × 10⁻¹¹ m

The value of 1 m = 100 cm then the diameter of H-atom =  74 × 10⁻⁹ cm

As we know, the value of one inch = 2.52 cm

So, if 74 × 10⁻⁹ cm length takes H-atom = 1

Then, 2.52 cm would take hydrogen atoms = 2.52/  74 × 10⁻⁹ = 3.43 × 10⁷

Therefore, 3.43 × 10⁷ hydrogen atoms lined up side to side to make 1.00 inch.

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Standard fire hydrants should not be installed on water mains smaller than 6 inches in size.

Fire Hydrants and Branches:

1.     Gridironing of Public Water Mains: Whenever possible, gridironing of public water mains shall be planned so that not more than one fire hydrant will be installed on a six-inch (6″) diameter water main between intersecting mains, and not more than two (2) fire hydrants installed on an eight-inch (8″) diameter water main between intersecting mains.

2.     High Value Areas: In industrial, warehouse, institutional, shopping center, or other high value areas within or outside the principal business district, there shall be one or two (2) fire hydrants at each street intersection, depending upon the character of the area, with intermediate fire hydrants placed so that they are not over three hundred feet (300′) apart. In general, depending upon the area’s characteristics, the average area to be served by each fire hydrant shall be from eighty thousand (80,000) to ninety thousand (90,000) square feet.

3.     Residential Areas: In residential areas there shall be one fire hydrant installed at each street intersection with intermediate fire hydrants located so that said fire hydrants are spaced not over three hundred feet (300′) apart. In general, depending upon the area’s characteristics, the average area to be served by each fire hydrant shall not exceed one hundred ten thousand (110,000) square feet.

4.     Fire Hydrant Branches: Fire hydrant branches shall have a minimum diameter of six inches (6″). In all cases a valve shall be installed on each fire hydrant branch and in no case shall the valve be of smaller diameter than the fire hydrant branch. Branch valves shall be situated not less than eighteen inches (18″) or more than twenty-four inches (24″) from the branch feeder main.

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C6H1206 is a compound (of glucose).

The ion channel associated with the NMDA receptor is permeable to calcium (Ca²⁺), while the ion channel associated with the AMPA receptor is permeable to sodium (Na⁺).

The NMDA receptor is a type of glutamate receptor found in the central nervous system (CNS) that plays a crucial role in synaptic plasticity and learning.

When glutamate, the primary excitatory neurotransmitter, binds to the NMDA receptor, it allows the influx of calcium ions (Ca²⁺) into the postsynaptic neuron.

Calcium entry through the NMDA receptor is important for long-term potentiation (LTP), a process involved in strengthening synaptic connections and facilitating learning and memory.

On the other hand, the AMPA receptor is also a type of glutamate receptor that mediates fast synaptic transmission in the CNS.

When glutamate binds to the AMPA receptor, it opens an ion channel that is permeable to sodium ions (Na⁺), leading to depolarization of the postsynaptic membrane and generation of an excitatory postsynaptic potential (EPSP).

This EPSP can trigger the firing of an action potential in the postsynaptic neuron, allowing for the transmission of signals between neurons.

Therefore, the NMDA receptor's ion channel allows the passage of calcium (Ca²⁺), while the AMPA receptor's ion channel permits the flow of sodium (Na⁺).

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Complete question here:

The ion channel associated with the NMDA receptor is permeable to ____ while the ion channel associated with the AMPA receptor is permeable to a. iron; sodium b. glutamate; potassium C. calcium, sodium and potassium; sodium d. calcium and selenium, potassium and sodium e. calmodulin; glutamate

Answer:

The shapes of continents fit together like a puzzle.

Explanation:

Just look at the east coast of South America and the west coast of Africa—it's almost a perfect fit! Identical rocks have been found on different continents. These rocks formed millions of years ago before the continents separated.

Taking into account the reaction stoichiometry, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.

In first place, the balanced reaction is:

C₃H₈ + 5 O₂  → 3 CO₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 44 grams of C₃H₈ react with 5 moles of O₂, 155 grams of C₃H₈ react with how many moles of O₂?

\(moles of O_{2} =\frac{155 grams of C_{3} H_{8}x5 moles of O_{2} }{44 grams of C_{3} H_{8}}\)

moles of O₂= 17.61 moles

Finally, 17.61 moles of O₂ is required to react with 155 grams of C₃H₈.

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Answer: sodium

Explanation: Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.

Based on the flame test, the gaseous element which is present in street lights is sodium.

Spectrum is a table or a chart in which intensity of the emitted lights are showing over a range of species.

Each element show different color of spectrum in the emission process, whenever excited element emitted enegy then released energy is shown in the form of color spectrum. In traffic lights sodium lamps are present which in the presence of heat gets excited and changes to the gas form and emitted yellow color light.

Hence sodium gaseous element is present in street lights.

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Approximately 24.55 cm^3 of oxalic acid must be added to sufficient water to give a 1.500 liter solution with a formal concentration of 0.300 F.

To find the volume of oxalic acid needed to make a 1.500 liter solution with a formal concentration of 0.300 F, we need to use the equation:

Formal concentration (F) = (moles of solute) / (volume of solution in liters)

First, we need to calculate the moles of oxalic acid required. The formal concentration (F) is given as 0.300, so:

0.300 = (moles of oxalic acid) / 1.500

Rearranging the equation, we find:

moles of oxalic acid = 0.300 * 1.500

moles of oxalic acid = 0.450

Next, we can calculate the mass of oxalic acid needed using its molecular mass:

mass of oxalic acid = moles of oxalic acid * molecular mass

mass of oxalic acid = 0.450 * 90.03

mass of oxalic acid = 40.5145 g

Finally, we can calculate the volume of oxalic acid needed using its density:

volume of oxalic acid = mass of oxalic acid / density

volume of oxalic acid = 40.5145 g / 1.65 g/cm^3

volume of oxalic acid = 24.55 cm^3

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The role of the forensic chemist in the Pan Am Flight 103 investigation was primarily focused on identifying the explosive used, which is crucial in determining the cause of the explosion and providing valuable evidence for the investigation.

The role of the forensic chemist in the Pan Am Flight 103 investigation involved identifying the explosive used. In this case, the forensic chemist would have analyzed the debris from the wreckage to determine the type of explosive that was used to cause the explosion.

To identify the explosive, the forensic chemist would have used various techniques, such as spectroscopy and chromatography, to analyze the chemical composition of the debris. By comparing the results with known explosives, the forensic chemist would have been able to determine the specific type of explosive used.

The identification of the explosive is crucial in the investigation as it helps in determining the cause of the explosion and provides valuable information about the perpetrators. Different types of explosives leave distinct chemical signatures, which can be used to link the explosion to a specific group or individual.

In addition to identifying the explosive, the forensic chemist may have also been involved in determining the cause of death of the victims. This could include analyzing autopsy samples for the presence of explosive residue or other chemical substances that could have contributed to the deaths.

It's important to note that while identifying the explosive and determining the cause of death are key responsibilities of a forensic chemist, other experts such as forensic pathologists and dental professionals would have been involved in identifying the victims from dental records and reconstructing the accident.

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The energy as heat needed to increase the temperature of 0.40 mol of tungsten by 10.0 K is 96.8J.

The energy of a substance can be calculated using the following formula;

Q = mc∆T

Where;

According to this question, the molar heat capacity of tungsten is 24.2 J/K•mol. The energy as heat needed to increase the temperature of 0.40 mol of tungsten by 10.0 K is as follows:

Q = 0.40 × 24.2 × 10

Q = 96.8J

Therefore, 96.8J is the energy of the tungsten metal.

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The energy of one quantum of orange light, given that it has a frequency of 4.8×10¹⁴ s⁻¹ is 3.18×10⁻¹⁹ J

We know that energy and frequency are related according to the following equation:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

Using the above formula, we can obtain the energy of one quantum of the orange light. Details below:

Energy (E) = Planck's constant (h) × frequency (f)

E = hf

E = 6.626×10⁻³⁴ × 4.8×10¹⁴

E = 3.18×10⁻¹⁹ J

Thus, the energy is 3.18×10⁻¹⁹ J

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Answer:

Thermal is the heat coming through  the pot . Radiation is the waves of heat coming off of the pot. Convection is the water that is being heated.

Explanation:

Answer:

Radiation: heat of the steam

Conduction: pot on your hand

Convection: ????

Explanation:

helo

Answer:

In the human body, potential energy is stored in the bonds between atoms and molecules. Chemical energy is the form of potential energy in which energy is stored in chemical bonds. When those bonds are formed, chemical energy is invested, and when they break, chemical energy is released. Notice that chemical energy, like all energy, is neither created nor destroyed; rather, it is converted from one form to another. When you eat an energy bar before heading out the door for a hike, the honey, nuts, and other foods the bar contains are broken down and rearranged by your body into molecules that your muscle cells convert to kinetic energy.

Explanation:

Answer:

A shadow is that thing that follows you everywhere when the sun is out. It's creepy!

Explanation: Hope I helped!

Answer:

A shadow is a dark form that you cannot touch, hear, feel, or taste. It's simply formed when an object blocks a source of light.

Answer:

files  

Explanation:

i had to answer the same question

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, chemical formula can be shown as below.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

Compound                                                          chemical formula

alkane                                                                  CnH2n+2

alkene with one double bond                            CH\(_2\)=CH\(_2\)

alkene with two double bond                             CH\(_2\)=c=CH\(_2\)

cycloalkane                                                          C\(_6\)H\(_{12}\)

Therefore, chemical formula can be shown as above.

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Answer:

because it's soaked in a mix of alcohol and water

Explanation:

the bill absorbs the water and the alcohol burns off

Answer: Its B for the Study Island assignment

Explanation:

Electrophile is a substance that is lacking in electrons and is attracted to a region that has electrons available. Electrophilicity is a qualitative measure of electrophiles ability to attract electrons.

When it comes to electrophilic compounds, they react readily with nucleophiles.

The correct order of decreasing electrophilic strength is given below:

CF3 > CF3H > H > H

Reasoning:

Electrophilicity is defined as the ability of an atom or a compound to accept a pair of electrons in a chemical reaction. The electrophilic compound is one that easily accepts electrons from another compound.

Fluorine and the trifluoromethyl group, in particular, are highly electron-withdrawing groups that make the carbon atoms of the methyl groups significantly electrophilic.

The fluorine atom's high electronegativity creates a significant dipole moment in the C-F bond, resulting in a polarized carbon atom, which enhances its electrophilicity.

Therefore, in this case, the order of decreasing electrophilic strength is CF3 > CF3H > H > H.

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Answer:

An endothermic reaction takes in heat, but feels cold to the touch. An exothermic reaction gives off heat and feels warm to the touch because it is heating the outside objects.

The density of the metal has the high inherit percentage of error than the value for the liquid because the possibility error in measuring the volume of the solid is more than the liquid.

The density is expressed as follows :

Density = mass / volume

The volume of the solid cannot be measure directly. The volume of the solid can be measured by immersing the solid in to the liquid and then we measure the volume of the liquid displaced. The possibility error in measuring the volume of the solid, especially when the shape of the solid is irregular, is more than the liquid.

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Orthoboric acid is a weak acid with the chemical formula H3BO3. It can react with various compounds to form different products.

Here are the reactions of orthoboric acid with sodium hydroxide and ethyl alcohol:

Reaction with Sodium Hydroxide:

When orthoboric acid reacts with sodium hydroxide (NaOH), it forms sodium borate and water. The balanced chemical equation for the reaction is:

H3BO3 + NaOH → Na[B(OH)4] + H2O

In this reaction, one molecule of orthoboric acid reacts with one molecule of sodium hydroxide to produce one molecule of sodium borate and one molecule of water.

Reaction with Ethyl Alcohol:

Orthoboric acid can react with ethyl alcohol (C2H5OH) to form triethyl borate and water. The balanced chemical equation for the reaction is:

3C2H5OH + B(OH)3 → B(O-C2H5)3 + 3H2O

In this reaction, three molecules of ethyl alcohol react with one molecule of orthoboric acid to produce one molecule of triethyl borate and three molecules of water.

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Answer:

ethylene(ethane) + oxygen → carbon dioxide + water

the type of reaction is COMBUSTION.

Answer:

3rd or 4th answer is correct

OPTION B is the correct answer

Answer:

yes

Explanation:

yes they're very common.

If a fatty acid has 20 carbons, ATP will it produce after it completely breaks down into co2 and water would be approximately 129 ATP

During beta-oxidation in the mitochondria, the fatty acid is broken down into two-carbon units called acetyl-CoA, which enters the citric acid cycle to produce ATP. Each round of the citric acid cycle produces 1 ATP, 3 NADH, and 1 FADH2, which enter the electron transport chain to produce more ATP.

Since one fatty acid with 20 carbons produces 10 acetyl-CoA units, it goes through the citric acid cycle 10 times, therefore, it produces 10 ATP, 30 NADH, and 10 FADH2. The NADH and FADH2 produced from beta-oxidation produce more ATP through oxidative phosphorylation in the electron transport chain, producing approximately 2.5 ATP per NADH and 1.5 ATP per FADH2. So, the total ATP produced from the complete breakdown of a fatty acid with 20 carbons would be approximately 129 ATP (10 from the citric acid cycle and 119 from the electron transport chain).

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