The standard unit for measuring mass is the

Considering the reaction stoichiometry, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.

The balanced reaction is:

3 Cu + 8 HNO₃ → 3 Cu(NO₃)₂ + 2 NO + 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 present in the reaction is:

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

Cu: 3 moles ×63.54 g/mole= 190.62 grams

HNO₃: 8 moles ×63 g/mole= 504 grams

Cu(NO₃)₂: 3 moles ×187.54 g/mole= 562.62 grams

NO: 2 moles ×30 g/mole= 60 grams

H₂O: 4 moles ×18 g/mole= 72 grams

It is possible to determine the the amount of mass of H₂O produced by a rule of three: if by stoichiometry 8 moles of HNO₃ produce 72 grams of H₂O, if 11.9 moles of HNO₃ react how much mass of H₂O will be formed?

\(mass of H_{2}O=\frac{11.9 moles of HNO_{3} x72 grams of H_{2}O}{8 moles of HNO_{3}}\)

mass of H₂O= 107.1 grams

In summary, the mass of H₂O that is produced when 11.9 moles of HNO₃ react is 107.1 grams.

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I think the answer is either "D. All four forces are acting on the student." or "B. The normal force and the gravitational force are being balanced." but I'm not 100% sure. If you go with any of my answers and it's wrong, I'm really sorry.

Reflecting telescopes are preferred for scientific research because they are better suited for gathering large amounts of light and producing high-quality images. However, refracting telescopes are still popular for amateur astronomers and for viewing objects on Earth.

Reflecting telescopes are different from refracting telescopes because reflecting telescopes use mirrors, whereas refracting telescopes use lenses. The reflecting telescope was invented in 1668 by Sir Isaac Newton, and it has since become one of the most popular types of telescopes.
Reflecting telescopes use a mirror to gather and focus light, while refracting telescopes use a lens to do the same thing. Reflecting telescopes can be made much larger than refracting telescopes because it is easier to make large mirrors than it is to make large lenses. The mirror in a reflecting telescope is placed at the back of the telescope, and it gathers and reflects light back to a secondary mirror, which then reflects the light to the eyepiece. The eyepiece is where the observer looks through the telescope.In contrast, the lens in a refracting telescope is placed at the front of the telescope, and it gathers and bends light as it passes through. The lens focuses the light onto an eyepiece at the back of the telescope. Refracting telescopes are generally smaller than reflecting telescopes because of the difficulty of making large lenses.
Another difference between reflecting and refracting telescopes is the way they are constructed. Reflecting telescopes have a simple tube that houses the mirrors and eyepiece, while refracting telescopes have a more complex design with a long tube that contains the lens and eyepiece.

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Chemical bonding explains the properties of chemical and biological polymers by forming strong covalent bonds or flexible hydrogen bonds, which give the polymer its unique characteristics.

Chemical bonding is a fundamental concept that explains the properties of chemical and biological polymers. Chemical bonds are formed when atoms interact with each other to form molecules or particles. In a polymer, the atoms are linked together in a repeating pattern, forming a long chain. These bonds give the polymer its unique properties, such as strength, flexibility, and the ability to interact with other molecules. The type of chemical bond formed between the atoms will determine the properties of the polymer.

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Answer:

An atom of a group 17 element such as chlorine has seven valence electrons. It is “eager” to gain an extra electron to fill its outer energy level and gain stability. Group 16 elements with six valence electrons are almost as reactive for the same reason

Explanation:

o find out how many liters of blood a 151 lb adult has, we need to convert the weight from pounds to pints, and then from pints to liters. First, we'll convert the weight from pounds to pints. Given that 2 pints = 1 qt, we can set up the proportion:

151 lb * (2 pints / 1 qt) = 151 lb * (2 pints / 1 qt) * (1 qt / 2 pints)

= 151 lb * 1 qt

= 151 qt.

So, the adult has 151 pints of blood.

Next, we'll convert the pints to liters. Given that 1 L = 1.057 qt, we can set up the proportion:

151 pints * (1 L / 1.057 qt) = 151 pints * (1 L / 1.057 qt) * (1.057 qt / 1 L)

= 151 pints * 1 L

= 142.93 L.

Therefore, the adult has approximately 142.93 liters of blood.

A 151 lb adult has approximately 142.93 liters of blood.

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The individual weighing 151 lbs has approximately 4.26 liters of blood

The given information states that an adult weighing 151 lbs has approximately 9.0 pints of blood. To find out how many liters of blood this individual has, we can use the conversion factors provided.

First, we need to convert pints to quarts. Since 2 pints equal 1 quart, we can divide 9.0 pints by 2 to get the equivalent amount in quarts. This gives us 4.5 quarts of blood.

Next, we need to convert quarts to liters. According to the conversion factor given, 1 liter is equal to 1.057 quarts. To find the number of liters, we can divide the number of quarts (4.5) by the conversion factor (1.057). This calculation gives us approximately 4.26 liters of blood.

Therefore, the individual weighing 151 lbs has approximately 4.26 liters of blood.

In summary:
- 151 lbs adult has approximately 9.0 pints of blood.
- Converting 9.0 pints to quarts, we get 4.5 quarts of blood.
- Converting 4.5 quarts to liters, we get approximately 4.26 liters of blood.

So, the individual has approximately 4.26 liters of blood.

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Answer:

Cesium

Explanation:

cuz i looked at the chart from highest to lowest

Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.

Periodic table is defined as a list of chemical elements that are ordered in atomic number order, typically in rows, with comparable chemical elements appearing in vertical columns because of their similar atomic structures. The table can be used by scientists to anticipate chemical reactions, study trends in the periodic properties of certain elements, and speculate on the properties of yet-to-be-discovered elements.

The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered. He organized the elements into groups based on their atomic weight, rearranging them if necessary if he found that they did not fit.

Thus, Mendeleev's holes have long since been filled in and new elements have been added to the periodic table.

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Answer:

C2H6O + 3O2 - > 2CO2 + 3H20

The ΔH°rxn for the combustion of carbon monoxide to produce carbon dioxide is -283 kJ/mol. This negative value indicates that the reaction is exothermic, meaning it releases heat to the surroundings.

The combustion of carbon monoxide (CO) to produce carbon dioxide (CO_2) can be represented by the equation:

CO + 1/2 O_2 -> CO_2

To calculate the standard enthalpy change (ΔH°rxn) for this reaction, we need to know the standard enthalpies of formation (ΔH°f) for carbon monoxide (CO), oxygen (O_2), and carbon dioxide (CO_2).

The standard enthalpy of formation is the change in enthalpy when one mole of a compound is formed from its elements in their standard states at a specified temperature and pressure. The standard enthalpy of formation for carbon monoxide (CO) is -110.5 kJ/mol, the standard enthalpy of formation for oxygen (O_2) is 0 kJ/mol, and the standard enthalpy of formation for carbon dioxide (CO_2) is -393.5 kJ/mol.

Using these values, we can calculate ΔH°rxn as follows:

ΔH°rxn = Σ(ΔH°f products) - Σ(ΔH°f reactants)

        = [1*(-393.5 kJ/mol)] - [1*(-110.5 kJ/mol) + 1/2*0 kJ/mol]

        = -393.5 kJ/mol + 110.5 kJ/mol

        = -283 kJ/mol

If a molecular compound has the empirical formula xy3, the molecular formula could be xy6 or x2y6. Answer: d) x2y6

The empirical formula of a molecular compound has a lower ratio of atoms than the molecular formula. The molecular formula has the actual number of atoms of each element in one molecule of the compound. The difference between molecular formula and empirical formula is that the molecular formula is the actual formula of the molecule, whereas the empirical formula is the simplified version of the molecular formula.

If the empirical formula is xy3, the molecular formula could be xy6 or x2y6. Answer: d) x2y6. That means that in the simplest form, the ratio of x to y is 1:3. A possible molecular formula can be figured out using the molecular weight of each element in the compound. Suppose we use x as one molecular weight unit and y as another molecular weight unit. So we can say that the empirical formula for the compound is (x)(y3), which can be simplified to XY3. So, the molecular formula for the compound must be X2Y6 because the ratio of atoms between the two elements should remain 1:3. So, this ratio can only be achieved by multiplying the molecular formula by 2 (1x2) and 2 (3x2) times, resulting in X2Y6.

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Answer:

the first one

Explanation:

Explanation:

Noble gases are odorless, colorless, nonflammable, and monotonic gases that have low chemical reactivity. The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons. So, noble gases cannot participate in ionic bond formation.

Answer:

Because they can't!

Explanation:

For ionic bonds, ions are needed to be made which are made to form a stable outer shell octet of electrons of each atom to gain atomic stability. The noble gases don't need to form ions since they already have the octet of electrons in their outer shells. If they don't form ions, they don't form ionic bonds too.

This is one of the reasons why noble gases are unreactive.

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Answer:

red dwarf

Explanation:

Answer:

D

Explanation:

Answer:80

Explanation:

It would be 80 kilometers an hour. All you have to do is divide the total distance traveled which in this case is 240 kilometers, by the number of hours driven which is 3 hours.

The dipotassium salt of citric acid (K2HC6H5O7) is formed by the neutralization reaction between citric acid (H3C6H5O7) and potassium hydroxide (KOH).

The citric acid molecule has three acidic hydrogen atoms that can dissociate in water to form H+ ions, resulting in an acidic solution. However, in the dipotassium salt form, two of the acidic hydrogen atoms have been replaced by potassium ions, leaving only one acidic hydrogen atom.

When the dipotassium salt of citric acid is dissolved in water, the remaining acidic hydrogen atom can dissociate to form H+ ions, but the solution will be less acidic compared to a solution of citric acid. Therefore, the dipotassium salt of citric acid forms a weakly acidic solution in water.

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A higher field strength in NMR spectroscopy results in increased resolution, sensitivity, and the ability to study larger molecules.

In NMR spectroscopy, a higher magnetic field strength leads to better spectral resolution due to the narrower chemical shift range of each nucleus. This results in sharper and better-resolved spectral lines, allowing for easier identification and analysis of compounds. Additionally, higher field strengths provide increased sensitivity, allowing for the detection of smaller sample quantities and more accurate measurement of sample concentrations. The increased field strength also enables the study of larger molecules, as it provides a higher signal-to-noise ratio and better resolution of overlapping signals. Overall, the use of a magnet with as great a field strength as possible improves the accuracy and precision of NMR measurements and allows for the study of a wider range of compounds.

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Answer:

To put some order into his study of chemical elements, Mendeleev made up a set of cards, one for each of the 63 elements known at the time.

Explanation:

False. According to the Valence bond theory, bonds are formed in molecules through the overlap of valence electron atomic orbital containing single electron.

Valence bond theory is said to be theory which is introduced to describe bonding in covalent molecules. According to this, bonds are considered to form from the overlapping of two atomic orbitals on different atoms that each orbital containing a single electron. This theory describes the covalent bond as the overlap of half-filled atomic orbitals that each containing a single electron that yield a pair of electrons shared between the two bonded atoms. According to the valence bond theory, an orbital on one atom overlaps an orbital on a second atom and the single electrons in each orbital combine to form an electron pair. The orbitals on two different atoms overlap when a portion of one orbital and a portion of a second orbital occupy the same region of space.

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Answer:

B. Neutral

Explanation:

When there is a ionic bond,  one element steals or takes away an electron from the other element.

An example is NaCl

In this compound, Chlorine atom steals an extra electron from Sodium to fill its outer shell. So, this is a Ionic bond. Since, the Sodium compound gives away an atom, it is positively charged. Since, Chlorine steals an atom, it is negatively charged. Opposite charges attract, so they become a compound.

When positive and negative mix, it becomes neutral.

In comparison to sodium chloride, nitrogen gas (N2) has a higher average vibrational energy at 22 °C.

In comparison to molecules of liquid and solid substances, the average distance between gaseous material molecules is higher.

Due to the enormous distances between the molecules, the molecules of gases always travel more quickly.

The average speed of the molecules is slowed down by the dense packing of the molecules in solids. Sodium chloride (NaCl) is a solid, whereas nitrogen gas (N2) is a gaseous substance.

We can therefore draw the conclusion that the average vibrational energy of nitrogen gas (N2) at 22 c is higher than the average vibrational energy of sodium chloride at same temperature.

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The correct options are (1) and (4).  During the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced.

In a chemical cell, a redox reaction occurs, and the electrons are transferred from one electrode to another. In this case, the reaction is:

Zn(s) + Cu2+(a q)  → Zn2+(a q) + Cu(s)

At the anode, which is the electrode where oxidation occurs, Zn atoms lose electrons and form Zn2+ ions in solution:

Zn(s) → Zn2+(a q) + 2e-

These electrons flow through an external wire to the cathode, where they are accepted by Cu2+ ions and copper metal is deposited:

Cu2+(a q) + 2e- → Cu(s)

Which means that during the reaction, the mass of the Zn(s) electrode decreases as it is oxidized, and the mass of the Cu(s) electrode increases as it is reduced. The concentration of Cu2+ ions in solution stays the same, as it is not involved in the electrode reactions. The concentration of Zn2+ ions in solution increases as Zn(s) is oxidized to form Zn2+ ions.  The correct answers are (1) and (4).

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Answer:

12.9L

Explanation:

V1 = 8.5L

P1 = 3.5

P2 = 2.3

V2 = ?

P1 V1 = P2 V2 ( Boyle's law )

3.5×8.5 = 2.3×V2

Divide both sides by 2.3

3.5×8.5/2.3 = 2.3×V2/2.3

V2 = 29.5/2.3

=12.9L

Surfactants reduce the activation energy of the reaction to exert catalytic effects, making the catalyzed reaction more energetically favorable.  Option (C) is correct "Reducing the activation energy of the reaction".

Surfactants are chemical compounds that lower the surface tension between two liquids or between a liquid and a solid, which makes them useful in a wide range of industrial and domestic applications. They have the ability to exert catalytic effects through the reduction of activation energy of the catalyzed reaction.
Explanation:Surfactants are molecules that have both hydrophilic (water-loving) and hydrophobic (water-hating) ends. They reduce surface tension and interfacial tension between liquids and solids by adsorbing at the interface. In catalytic reactions, surfactants reduce the activation energy of the reaction by facilitating the movement of reactants from one phase to another or by stabilizing the transition state. This increases the rate of the reaction and decreases the activation energy. Thus, surfactants can act as effective catalysts for a variety of reactions.
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance called a catalyst. A catalyst is a substance that increases the rate of a reaction without being consumed or permanently changed in the process. In a catalyzed reaction, the catalyst lowers the activation energy required for the reaction to occur. This allows the reaction to proceed at a faster rate, often with lower temperatures and pressures than would otherwise be required.

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If the flask already has water, your measure is going to be higher than expected and MW is going to be higher too.

At first sight, we need to assume 1 atm as atmospheric pressure, probably forgot to write down this value in the Lab. By doing this, we got all values to calculate the MW.

So, for trial 1:

MW = [0.36 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 71.08 g/mol

Trial 2:

MW = [0.38 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 75.53 g/mol

Average MW = 73.31 g/mol

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An imbalanced chemical equation describes the product and reactants of a chemical reaction. Therefore, the coefficient  for phosphoric acid is 1.

A balanced equation is a chemical reaction equation in which the overall charge and the amount of atoms for each component in the reaction are the same for both the products and the reactants. In those other words, the weight and charge on both sides of both the reaction are balanced.

An imbalanced chemical equation describes the product and reactants of a chemical reaction yet does not include the quantities needed to meet mass conservation.

The balanced equation for the given reaction can be given as

3 KOH + H\(_3\)PO\(_4\) → K\(_3\)PO\(_4\) + 3H\(_2\)O

The coefficient  for phosphoric acid is 1.

Therefore, the coefficient  for phosphoric acid is 1.

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In order to answer the question first we must write the atomic number of each element:

Zirconium (Zr): 40

Cadmium (Cd): 48

Iridium (Ir): 77

Iron (Fe): 26

Then, we have to complete the distribution of electrons in each orbital for each atom:

The first 4 levels have the following distribution:

Level1: 1s

Number of electrones: 2

Level 2: 2s, 2p

Number of electrones 8 (2 in the s orbital and 6 in the p orbitals).

Level3: 3s, 3p, 3d

Number of electrones 18 (2 in the s orbital, 6 in the p orbital and 10 in the d orbitals)

Level 4: 4s, 4p, 4d, 4f

Number of electrones 32 (2 in the s orbital, 6 in the p orbitals, 10 in the d orbitals and 14 in the f orbitals)

The order in which the orbitlas are completed depends on the energy of each level. For example the 4s orbitals will be completed before the 3d orbitals because their energy is lower.

The order is as follows:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p...

Now, knowing the atomic number we can answer the question:

For Zirconium (total 40 electrones):

2 electrones are predicted in the 4d orbital

For Cadmium (total 48 electrones):

10 electrones are predicted in the 4d orbital

For iridium, as it has an atomic number higher than Cadmium we can predict tha it also complets the 4d orbital, then it has also 10 electrones in it.

For iron (total 26 electrones)

Iron has no electrones in the 4d orbitals

Answer:

try to give away its two outer electron to another atom

Explanation:

Molecular formular for C3H8O ( Isopropyl alcohol)

comprises of 3 Carbon, 8 Hydrogen and 1 oxygen ,

So, first box =3

second box = 8

third box = 1

emperical mass c3h80 =( 3*12) + (1*1) + (1*15.99) = 53.03 g/mole

Molecular formular = molecular weight / emperical mass

= 60.10g/mole /53.03g/mole = 1.133

if we multiply subscripts numbers ; we still get

Molecular formula = C3H8O

However, the second option doesnt have the option of 8 hydrogen .