2. What is a mixture?

The  theoretical yield of the solution has been obtained as  17.1 g

Let us recall that each time that we hear about a chemical reaction what we are talking about is the combination of two or more reactants and a product must be formed. In this case we are to find the theoretical yield of this reaction.

We have been told that the HCl is in excess thus we have the 2-methyl-2-butanol as the limiting reactant.

Mass of the solution = density * volume

Mass of the solution = 0.805 g/ml * 17.6 ml

= 14.2 g

Number of moles = mass/molar mass

= 14.2 g/88 g/mol

= 0.16 moles

Given that the reaction is 1:1, 0.16 moles of the product is obtained.

Theoretical yield = Number of moles products * molar mass of products

= 0.16 moles * 106.59 g/mol

= 17.1 g

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Answer:

I’m not sure! Bacteria are kind of disgusting, but some of them might be helpful.

Explanation:

My opinion since I didn't get to read the article :)

2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

The energy required in a calorimetry can be calculated using the following formula:

Q = m × c × ∆T

Where;

According to this question, 4.37 g of silver should be heated from 25°C to 27.5°C. The heat required is as follows:

Q = 4.37 × 0.24 × (27.5 - 25)

Q = 1.0488 × 2.5

Q = 2.62J

Therefore, 2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

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The first step is to convert the volume from milliliters to liters. This is because the concentration is given in milligrams per liter, so we need to make sure that the volume is in liters as well.

. 100 mL = 0.1 L. Convert the concentration from milligrams per deciliter (mg/dL) to milligrams per liter (mg/L). 50 mg/dL = 50 mg/L. Multiply the volume by the concentration to get the mass of KH2PO4 in milligrams. 0.1 L * 50 mg/L = 5 mg

Divide the mass in milligrams by the molar mass of KH2PO4 (136.09 g/mol) to get the mass in grams. 5 mg / 136.09 g/mol = 0.0365 g

The first step is to convert the volume from milliliters to liters. This is because the concentration is given in milligrams per liter, so we need to make sure that the volume is in liters as well.

The second step is to convert the concentration from milligrams per deciliter to milligrams per liter. This is because a deciliter is equal to 0.1 liter, so we need to multiply the concentration by 10 to get the concentration in milligrams per liter.

The third step is to multiply the volume by the concentration to get the mass of KH2PO4 in milligrams. This is because the concentration tells us how many milligrams of KH2PO4 are in 1 liter of solution, and the volume tells us how many liters of solution we have.

The fourth step is to divide the mass in milligrams by the molar mass of KH2PO4 to get the mass in grams. This is because the molar mass tells us how many grams are in 1 mole of KH2PO4, and the mass in milligrams tells us how many milligrams of KH2PO4 we have.

Therefore, the mass of KH2PO4 required to yield 100 mL of a 50 mg/dL solution is 0.0365 g.

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Answer:

Protons

Protons are another type of subatomic particle found in atoms. They have a positive charge so they are attracted to negative objects and repelled from positive objects.

Explanation:

This problem is providing information about the equilibrium reaction whereby nitrogen dioxide gas produced dinitrogen tetroxide gas as shown on the attached picture and the following chemical equation:

NO₂ (g)  ⇄ N₂O₄ (g)

In such a way, we can consider the given choices to reason the following:  the blue arrow is pointing out the arrival to the equilibrium condition for the reaction, a point in which the rate of the forward reaction (formation of N₂O₄) is equal to the rate of the reverse reaction (formation of NO₂), because the molecules will fluctuate to the same relative amounts defined by the equilibrium constant.

Therefore the answer will be the first one on the attached file, which can vary on your online homework format.

It is important to note that the reactant is not used up at any point of the graph (concentration drops to 0) and also, the activation energy cannot be analyzed with this sparse information.

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Answer:

The questions I would like to answer are:

Will the productivity of the river severn offset the cost of installing the plant?

Is it possible to build a dam on site?

Is it possible to establish submerged turbines in this location?

How would human life and nature be impacted by the plant?

Explanation:

Tidal power plants are signals that use tidal energy to generate electricity. The installation of this type of plant is quite expensive and involves the establishment of dams on site to take advantage of the differences between high and low tides and the establishment of submerged turbines to take advantage of sea currents.

To decide whether I would decide to build a tidal plant on the Severn River, I would need to evaluate a few things to make sure that the project is viable. For that I would ask myself some questions like:

Will the productivity of the river severn offset the cost of installing the plant? (If the installation costs are greater than the capacity of this river to promote high generation of electricity, it would be better to abandon the project)

Is it possible to build a dam on site? Is it possible to establish submerged turbines in this location? (It is necessary to consider the physical and chemical characteristics of the place to know if it is possible to install these two equipment and in a way that they work efficiently)

How would human life and nature be impacted by the plant? (Projects like this include major environmental and social impacts. These impacts must be analyzed and ways to mitigate them must be considered and included in the project.)

Answer:

Explanation:Metalloids may act either like metals or nonmetals in chemical reactions. Most metalloids have some physical properties of metals and some physical properties of nonmetals. They fall between metals and nonmetals in their ability to conduct heat and electricity. They are shiny like metals but brittle like nonmetals.

Answer:

This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.

It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.

Considering the definition of ideal gas law,  a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P×V = n×R×T

So the pressure is calculated as:

\(P=\frac{n}{V}xRxT\)

In this case, you know:

Replacing:

P=0.0620 \(\frac{mol}{L}\)× 0.082 \(\frac{atmL}{molK}\)× 293 K

Solving:

P= 1.489612 atm≅ 1.5 atm

Finally, a pressure of 1.5 atm is required to achieve a CO₂ concentration of 0.0620 mol L⁻¹ at 20°C.

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Answer:  The correct answer is:  " 0.54 g " .

__________________________________________

Explanation:

Note that "hydrogen gas" is:  

H₂ (g)  ;   that is:  a "diatomic element" (diatomic gas) ;

_________________________________________

The molecular weight of "H" is:  1.00794 g ;

   (From the Periodic Table of Elements).

So, the molecular weight of:  H₂ (g)  is:

    " 1.00794 g * 2  = 2.01588 g ; {use calculator) ;

_________________________________________

Note the conversion for a gas at STP:

______

  1 mol of a gas = 22.4 L gas;

___

i.e. " 1 mol / 22.4 L " ;

____

So:     " 5.7 L H₂ (g)  \(* \frac{1 mol H_{2} }{22.4 L} *\frac{2.01588 g}{mol} =? ;\)

The "L" ("literes" cancel out to "1" ;  since "L/L = 1 ;

The "mol" (moles) cancel out to "1" ; since "mol/mol = 1 ;

____

and we are left with:

____

 [5.7 * 2.104588 g ] / 22.4  =  ?  g ;

______________________

→ [ 11.9961516  g ] / 22.4 =

          0.53554248214  g ;l

_____________________________

We round this value to:  " 0.54 g " ;

 → since "5.7 L " has 2 (two) significant figures;  

     22.4 is an exact number conversion;

     and "5.7 L" has fewer significant figures than:

    " 2.104588 " ; or:  " 1.00794 " .

  → as such: We round to "2 (two) significant figures."

______________________________

Hope this is helpful.  Wishing you the best in your academic endeavors!

_______________________________

Explanation:

Chlorine is a non metal so covalent bond. KBr has K metal and Br non metal of opp. charges so ionic bond. Na is a metal so ionic bond. NaCl has Na as metal and Cl as a non metal so ionic bond.

D is incorrect

Step 1 - Understanding the relation between volume and temperature for a gas

There are three very important variables that can alter the state of a gas: pressure, temperature and volume. When pressure is kept constant, the volume will increase proportionally to the temperature. This is known as Charles Law and can be stated mathetically as:

Whenever the temperature of a gas samples is raised rather quickly, it will expand a lot in a little space of time. This is known as explosion: the very rapid expansion of a gas. The greater the temperature, the greater the explosion because the volume will increase proportionally to T.

Step 2 - Understanding its relation to fireworks

The firework works via a chemical reaction that will reach very high temperatures. The substances in there will become gaseous and, due to the high temperature, the gases will expand quickly. This causes the explosions of fireworks.

The high temperature also allows electrons to jump from one level to an upper level, thus producing light when they come back. The greater the temperature reached by the reaction in the firework, the more the gas will expand, thus forming a more "spread" firework.

d. water is a polar molecule that's why it can dissolve ionic compounds.

The polarity of water refers to its molecular structure, where the oxygen atom has a partial negative charge and the hydrogen atoms have partial positive charges. This makes water a polar molecule, meaning that it has a positive and negative end. Due to its polarity, water is able to dissolve ionic and polar substances, making it an excellent solvent. This property of water is important in many biological and chemical processes.

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Based on the data provided and the equation of the reaction, the percent yield of the reaction is 76.8%.

The percent yield of the reaction is determined from the mole ratio of the given reaction as obtained from the equation of the reaction.

The equation of the reaction is: 2 KClO₃ ---> 2 KCl + 3 O₂

The mole ratio of  KClO₃ and KCl is 1 : 1

The expected yield of the reaction is calculated as follows:

The molar mass of KClO₃ = 122.5 g/mol

The molar mass of KCl = 74.5

Mass of KCl expected = 32.5/122.5 * 74.5

Mass of KCl expected = 19.8 g

Percent yield = 15.2/19.8 * 100%

Percent yield = 76.8%

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Answer:

Malleability describes the property of a metal's ability to be distorted below compression. It is a physical property of metals by which they can be hammered, shaped and rolled into a very thin sheet without rupturing. A malleable fabric could be planate by blow or rolling.

Explanation:

Ductility is the property of a solid, like a metal, to deform under a tensile stress (force). So if you pull on two ends of a metal wire or bar, and it “stretches” you have a ductile substance. Though I must caution that you don't confuse the definition of ductile to mean elastic. They are not synonyms. It is the opposite of brittle. When a ductile item breaks, it is after necking, where the diameter of the wire in question reduces as the length elongated. A brittle, or non-ductile material simple tears apart in a sharp and quick fashion with little to no visible necking taking place.

sonorous: producing sound (as when struck)

Answer:

The volume of the gas is approximately 4.41 liters

Explanation:

The details of the data of the Neon gas are;

The number of moles of Neon gas present, n = 11.6 moles

The temperature of the sample of Neon gas, T = 120 K

The pressure of the sample of the Neon gas, P = 25.6 atm

By the ideal gas equation, we have;

P·V = n·R·T

Where;

R = The universal gal constant = 0.08205 L·atm·mol⁻¹·K⁻¹

Therefore, we get;

V = n·R·T/P

Which gives;

V = 11.6 moles × 0.08205 L·atm·mol⁻¹·K⁻¹ × 120 K/(25.9 atm) ≈ 4.4097915 L

The volume of the gas, V ≈ 4.41 L.

The pressure in the cylinder after adding the helium is 0.873 atm.

We can use the ideal gas law to solve this problem. The ideal gas law states that:

PV = nRT

Since the temperature and volume of the gas are constant, we can simplify the ideal gas law to:

P1V = n1RT

P2V = (n1 + n2)RT

where P1 is the initial pressure of the gas, n1 is the initial number of moles of gas (6.38 mol of neon), n2 is the number of moles of gas added (3.22 mol of helium), and P2 is the final pressure of the gas.

P2 = (n1 + n2)RT/V

   = [(6.38 mol) + (3.22 mol)] * (0.0821 L*atm/mol*K) * (295 K) / V

   = 9.60 atm / V

To find V, we can use the fact that the volume is constant:

P1V = P2V

V = P1V/P2

 = (491 mm Hg) * (1 atm/760 mm Hg) * (22.4 L) / (9.60 atm)

 = 11.0 L

Now we can substitute V = 11.0 L into the expression for P2:

P2 = 9.60 atm / 11.0 L

   = 0.873 atm

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Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.

What is an isotope?

Isotopes are two or more atom kinds that share the same atomic number (protons in the nucleus), placement in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of possessing a different quantities of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics. The atomic number of an atom is the sum of the number of protons in the nucleus and the number of electrons in a neutral (non-ionized) atom. The mass number of an atom is determined by the quantity of nucleons—both protons and neutrons—in its nucleus, and it varies for each isotope of a given element.

Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.

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Answer:

yeah.. u cant only if heated the iced tea, breaking the sugar cube up has no effect on the dissolving process.

The false statement is (2) Group 3A metals are more reactive than Group 2A metals which are more reactive than Group 1A metals.

This statement is incorrect as the reactivity of the groups decreases as we move from Group 1A to Group 3A. Group 1A metals are the most reactive of the three groups, followed by Group 2A metals and then Group 3A metals. This trend can be explained by the increasing ionization energy and electronegativity from left to right across the periodic table.

Group 1A and 2A metals are indeed strong reducing agents. They readily give up their valence electrons to form cations and have a strong tendency to form ionic compounds with nonmetals. The oxides of Group 1A and 2A metals are basic in nature, as they react with water to form metal hydroxides. However, BeO is an exception to this trend as it is amphoteric in nature and can react with both acids and bases.

Hydroxides of most Group 2A metals are indeed less soluble than hydroxides of Group 1A metals due to the differences in the ionic/covalent character of the hydroxides. The hydroxides of Group 1A metals have more ionic character, while the hydroxides of Group 2A metals have more covalent character, which makes them less soluble in water.

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Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.

Moles are the ratio of mass and the molar mass of the compound or the molecule.

Moles of oxygen are calculated as:

\(\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}\)

The balanced chemical reaction can be shown as,

\(\rm 2HgO \rightarrow 2Hg + O_{2}\)

From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.

Moles of mercury oxide are calculated as:

\(\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}\)

Therefore, option C. 15.63 moles of mercury (II) oxide is needed.

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A liquid is allowed to evaporate and leaves no residue. It can not be determined whether it was an element, a compound, or a mixture.

A water vapor molecule stays roughly 10 days in the atmosphere after it has evaporated. Water vapor starts to cool back down as it ascends higher in the atmosphere. The water vapor condenses when it becomes cold enough, turning it back into liquid water. Eventually, individual water droplets will condense to create clouds and precipitation.

It is not possible to determined whether it would be an element, a compound and mixture because the size of the particle will be too less.

A method for separating homogenous mixtures with one or even more dissolved salts is called evaporation. The procedure separates the liquid from the solid components. Usually, the procedure entails heating the combination until there is no more liquid is present.

Therefore, it can not be possible to determined whether it was an element, a compound, or a mixture by evaporation.

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We can covert 100 mL of NaOH solution with a pH of 13 to a solution with a pH of 12 by adding 900 mL of water to the 100 mL of NaOH solution.

Determination of the pOH of NaOH solution with pH 13

pH + pOH = 14

13 + pOH = 14

pOH = 14 – 13

pOH = 1

Determination of the molarity of NaOH solution with pH 13 (i.e pOH = 1)

[OH¯] = 0.1 M

Finally, we shall determine the molarity of the NaOH solution.

NaOH(aq) —> Na⁺(aq) + OH¯(aq)

0.1 M NaOH will also contain 0.1 M OH¯

pOH = 2

Determination of the molarity of NaOH solution with pH 12 (i.e pOH = 2)

We'll begin by calculating the concentration of the hydroxide ion [OH¯]

   pOH = 2

   Concentration of the hydroxide ion [OH¯] =?

pOH = –Log [OH¯]

2 = –Log [OH¯]

[OH¯] = 0.01 M

Finally, we shall determine the molarity of the NaOH solution.

NaOH(aq) —> Na⁺(aq) + OH¯(aq)

From the balanced equation above,

1 mole of NaOH contains 1 mole of OH¯.

0.01 M NaOH will also contain 0.01 M OH¯

  Molarity of diluted solution (M₂) = 0.01

M₁V₁ = M₂V₂

10 = 0.01 × V₂

Divide both side by 0.01

V₂ = 1000 mL

Determination of the volume of water needed

Volume of water = 1000 – 100

Volume of water needed = 900 mL

Thus, to change the pH of 100 mL of NaOH solution from pH of 13 to pH of 12, added 900 mL of water to the initial solution.

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The correct option is 2:all enzymes are catalysts, but not all catalysts are enzymes and 4:enzymes tend to be organic, whereas nonenzymatic catalysts tend to be inorganic compounds.

Option 2 is correct because

The two types of catalysts available are enzymes and non-enzymes.

Enzymes are biological catalysts that speed up the rate of a chemical and are a particular type of catalyst that aids in the conversion of a substrate to a product. Catalysts that are not enzymes are Non-enzymatic catalysts  Chemical compounds like transition metals, enzymes, and biological complexes can all act as non-enzymatic catalysts. They aid in the creation of the transition state, which speeds up the chemical reaction. Non-enzymatic catalysts may alter the reaction's free energy or change the reaction's pathway to enhance the rate of the reaction

Option 4is correct because

Enzymes are biological molecules made up of carbon, hydrogen, and nitrogen atoms, among other things. As a result, they are classified as organic molecules. Inorganic molecules like metal ions and acids are commonly used as non-enzymatic catalysts.

Hence options 2 and 4 are correct.

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Answer:

The Equation for this reaction is as follow,

                               2 Cr(ClO₃)₃    →    2 CrCl₃  +  9 O₂

According to eq,

      604.68 g (2mole) of Cr(ClO₃)₃ produces  =  288 g (9 moles) of O₂

So,

                 146.5 g of Cr(ClO₃)₃ will produce  =  X g of O₂

Solving for X,

                             X  = (146.5 g × 288 g) ÷ 604.68 g

                    X  =  69.77 g of O₂

The actual yield of the oxygen in the reaction is 4.32 g.

The equation of the reaction is;

Ba(ClO3)2 → BaCl2 + 3O2

Now we have that ;

Number of moles of the barium chlorate is;

Number of moles = mass/Molar mass

= 15 g/304 g/mol

= 0.049 moles

If 1 mole of barium chlorate produced 3 moles of oxygen

0.049 moles of barium chlortae will produce 0.049 * 3/1

= 0.147 moles

Mass of the oxygen produced = 0.147 moles * 32 g/mol

= 4.7 g

Then we have that;

Percent yield = Actual/Theoretical * 100/1

92 = x/4.7 * 100/1

92 * 4.7 = 100x

x = 92 * 4.7/100

x = 4.32 g

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The correct option for the following reaction is \(\gamma\).

In the given reaction we can easily see that the reaction is already complete as a nuclear equation. There is no need for the product to balance the equation as it is not a chemical reaction where reactants and products interact to form new substances.

In this question we can see that a radioactive isotope of iodine-125 ( \(^{125}_{53} I\) ) is decaying to produce another isotope of iodine-125 ( \(^{125}_{53}I\) ) this process is called beta decay.

As no new element is required to balance the reaction we can say that the answer to this is \(\gamma\) as it doesn't add up anything to the reaction.

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