Identify each substance as a strong electrolyte, weak electrolyte, or non-electrolyte.

Answer:

metaloides

Explanation:

Due to catenation property of carbon

What is catenation property ?

Carbon has the capacity to join together to form lengthy chains. In actuality, among all the other atoms present in nature, carbon atoms are distinct due to catenation. Tetravalent connections between carbon atoms are what cause carbon chains to develop today.

They create tetravalent bonds, in which one carbon atom joins forces with four additional carbon atoms. They have a repeating structure because this structure can be repeated indefinitely without affecting the stability of the bonds or the compounds created.

In actuality, chains can create branches, which in turn, create sub-branches, which create rings, and so on. Now, there are two categories of carbon compounds, the first of which is open-chain or aliphatic molecules.

C forms covalent bonds almost exclusively.

C-C bonds are relatively short and therefore strong.

C-C multiple bonds form readily and are stable.

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The heat lost by 18.0 g of ethanol during cooling from 63.5 °C to -47.0 °C is approximately -4,193.76 J (or 4.19 kJ, rounded to two decimal places).

The temperature change and the mass of the substance are given. To calculate the heat lost by ethanol during cooling, we can use the formula:

q = mcΔT

where:

q = heat lost or gained (in joules)

m = mass of the substance (in grams)

c = specific heat capacity of the substance (in J/g·°C)

ΔT = change in temperature (in °C)

First, we need to determine the specific heat capacity of ethanol. The specific heat capacity of ethanol is approximately 2.44 J/g·°C.

Next, let's calculate the heat lost by the given mass of ethanol during cooling.

Step 1: Convert the mass of ethanol to grams.

The given mass is already in grams, so no conversion is needed.

Step 2: Calculate the change in temperature.

ΔT = final temperature - initial temperature

ΔT = (-47.0 °C) - (63.5 °C)

ΔT = -110.5 °C

Step 3: Plug the values into the formula and solve for q.

q = (18.0 g) × (2.44 J/g·°C) × (-110.5 °C)

q ≈ -4,193.76 J

Therefore, the heat lost by 18.0 g of ethanol during cooling from 63.5 °C to -47.0 °C is approximately -4,193.76 J (or 4.19 kJ, rounded to two decimal places). Note that the negative sign indicates heat loss.

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The tapetum lucidum, a reflective substance found in the choroid coat of cows, is responsible for a cow's ability to see at night by reflecting light that is absorbed by the retina back into the retina.

Many vertebrates and certain other creatures have a tissue layer in their eyes called the tapetum lucidum. There is a retroreflector directly behind the retina. It increases the amount of visible light that is available to the photoreceptors by reflecting it back through the retina (although slightly blurring the image). Some animals have excellent night vision thanks to the tapetum lucidum. The majority of these creatures are nocturnal, particularly the carnivores, while others are deep-sea creatures.

Some spider species have comparable adaptations. Humans are haplorhine primates, which do not have a tapetum lucidum and are nocturnal. Animals can see in lower light than they otherwise could thank to the presence of a tapetum lucidum. Iridescent tapetum lucidum reflects light roughly in accordance with thin-film optics' interference principles.

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8.022 is the value of pOH of the HNO₃ solution.

pOH of the HNO₃ solution can be calculated as:

pOH = -log [OH⁻], where

[OH⁻] = concentration of hydroxyl ion = 9. 50 × 10⁻⁹ M

Putting this value in the above equation, we get

pOH = -log ( 9. 50 × 10⁻⁹)

pOH = - (- 8.022) = 8.022

Hence, pOH of the HNO₃ solution is 8.022.

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The fraction of the strontium-90 absorbed in 1963 that remained in people's bones in 1994 is approximately 0.1507 or 15.07%.

The half-life of strontium-90 is 27 years.

Therefore, we can use the following formula to calculate the fraction of strontium-90 that remained in people's bones in 1994:

fraction = (1/2)^(t/h)where t is the time elapsed and h is the half-life of the substance.

In this case, t = 1994 - 1963 = 31 years, and h = 27 years.

So, the fraction of strontium-90 that remained in people's bones in 1994 is:

fraction = (1/2)^(31/27)≈ 0.1507 (rounded to 3 decimal places)

Therefore, the fraction of the strontium-90 absorbed in 1963 that remained in people's bones in 1994 is approximately 0.1507 or 15.07%.

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Answer:

1. Fe₂O₃ : Al = 1 : 2

2. Fe₂O₃ : Al₂O₃ = 1 : 1

3. Fe₂O₃ : Fe = 1 : 2

Note: The question is incomplete. The complete question is given below :

A thermite reaction releases large amounts of heat and light, resulting in the melting of the iron metal that forms during the reaction. The balanced chemical equation is given below: Fe₂O₃(s) + 2Al(s) ---> Al₂O₃(s) + 2Fe(l) Determine the correct mole ratios for the following substances, based on this chemical equation.

Explanation:

A thermite reaction is a highly exothermic reaction that occurs between a mixture of powdered aluminium and iron (iii) oxide.

The reaction is a redox reaction which produces aluminium oxide and metallic iron.

The heat given out in the reaction melts the iron formed. It is used to join railway tracks or cracked machine parts. The molten iron runs down between the tracks and welds them together.

The balanced equation of the reaction is given below :

Fe₂O₃(s) + 2Al(s) ---> Al₂O₃(s) + 2Fe(l) + Heat

The mole ratio of the reactant and products are as follows:

1. 1 mole of Iron (iii) oxide and 2 moles of aluminium are combined

Fe₂O₃ : Al = 1 : 2

2. 1 mole of aluminium oxide is produced from 1 mole of iron (iii) oxide

Fe₂O₃ : Al₂O₃ = 1 : 1

3. 2 moles of of iron are produced from 1 mole of iron (iii) oxide

Fe₂O₃ : Fe = 1 : 2

Answer:

The human musculoskeletal system (also known as the locomotor system, and previously the activity system) is an organ system that gives humans the ability to move using their muscular and skeletal systems. The musculoskeletal system provides form, support, stability, and movement to the body.

Explanation:

Answer:

It includes the skeletal system and the muscular system.

Hope it helps...........

Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.

So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. By transferring electron or sharing electrons,  particles combine to form the variety of matter.

Therefore, by transferring electron or sharing electrons,  particles combine to form the variety of matter.

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Explanation:

m=30

v=10

K.E=1/2mv^2

=1/2×30×10^2

=1/2×30×100

=1500 joule

\(n=\dfrac{m}{M}\) where n is moles, m is mass and M is molar mass.

To solve for mass, isolate m:

\(m=nM\)

Input given information:

\(m=5.8*58.44\\m=338.952\\m=340\)

There are 340 g in 5.8 mol of NaCl.

Answer:

Atomic mass is never an integer number for several reasons

IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.

IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.

                                    IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.

                            IBM's Watson utilizes a massively parallel, text mining-focused, probabilistic evidence-based computational architecture called DeepQA.

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Answer: A. 5.41

Explanation:

To calculate the moles :

\(\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}\)    

\(\text{Moles of} Al=\frac{2.50g}{27g/mol}=0.0926moles\)

\(\text{Moles of} Pb(NO_3)_2=\frac{8.65g}{331g/mol}=0.0261moles\)

\(2Al(s)+3Pb(NO_3)_2(aq)\rightarrow 3Pb(s)+2Al(NO_3)_3(aq)\)  

According to stoichiometry :

3 moles of \(Pb(NO_3)_2\) require  = 2 moles of \(Al\)  

Thus 0.0261 moles of \(Pb(NO_3)_2\) will require=\(\frac{2}{3}\times 0.0261=0.0174moles\)  of \(Al\)

Thus \(Pb(NO_3)_2\) is the limiting reagent as it limits the formation of product and \(Al\) is the excess reagent.

As 3 moles of \(Pb(NO_3)_2\) give = 3 moles of \(Pb\)

Thus 0.0261 moles of \(Pb(NO_3)_2\) give =\(\frac{3}{3}\times 0.0261=0.0261 moles\)  of \(Pb\)

Mass of \(Pb=moles\times {\text {Molar mass}}=0.0261moles\times 207g/mol=5.41g\)

Thus 5.41 g of solid lead will be produced from the given masses of both reactants.

Answer:

A horizontal row in the periodic table, which signifies the totoal number of electron shells in an element's atom.

Explanation:

Hope this helpss)):

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Answer:

D

Explanation:

cracks from temperature changes is a type of physical weathering often known as freezing and thawing

Answer:

Garnet is a hard transparent mineral that is often used as gemstones and abrasives and quartz is the most abundant mineral on the earth's surface. They are both minerals that come out of the earth and that's about the most they have in common.

Explanation:

I got this answer correct.

The minerals quartz and garnet are both composed of silica but they differ in their color of crystals .

Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.

If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.

Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.

Physical properties of minerals include color,streak, luster,specific gravity and cleavage.

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With the ICE in chemical equilibrium, 557.7 is the value of equilibrium constant (Kc) for the reaction at 300K.

The balanced chemical equation for the given reaction is:

A(g) + B(s) ⇌ 2C(g) + 3D(g)

The equilibrium constant expression (Kc) for this reaction is:

Kc =  \(\frac{[C]^2[D]^3}{[A]}\)

where [A], [C], and [D] are the molar concentrations of A, C, and D at equilibrium, respectively.

To solve this problem, we need to first calculate the initial and equilibrium concentrations of A. We can use the given information to construct the ICE below:

A

Initial: 0.91 M

Change: -x

equilibrium: 0.91-x

B

Initial: 0

Change: -

equilibrium: 0

C

Initial: 0

Change: +2x

equilibrium: 2x

D

Initial: 0

Change: +3x

equilibrium: 3x

We know that the equilibrium concentration of A is 0.262 M, so we can substitute this value into the ICE above and solve for x:

0.262 = 0.91 - x

x = 0.648 M

Now we can substitute the equilibrium concentrations into the Kc expression and solve for Kc:

Kc = \(\frac{[C]^2[D]^3}{[A]}\)

= \(\frac{(2x)^2(3x)^3}{(0.262)}\)

= 557.7

Therefore, the value of equilibrium constant (Kc) for the reaction at 300K is 557.7.

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At the end of glycolysis, one can find the energy that was contained in the chemical bonds of glucose in ATP, NADH and pyruvate molecule.

The process of glycolysis takes place in the cytosol of a cell. It can be broken down into two phases viz. energy requiring phase and energy releasing phase.

Energy requiring phase: The starting molecule i.e glucose is at first rearranged and two phosphate groups are attatched to it, which comes from ATP.  The phosphate groups form the sugar- fructose-1,6-biphosphate. This splits into three-carbon sugars

Energy releasing phase: The three carbon-sugars are converted into three-carbon molecules i.e two ATP molecules and one NADH molecule and pyruvate.

Thus, in ATP, NADH and pyruvate we can find the energy contained in chemical bonds of glucose.

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Answer:

(CH3COO)2 + redP + Cl2 → ClCH2COOH + HCl

Explanation:

This is an example of halogenation of carboxylic acids at alpha carbon atom. In this reaction, red phosphorus and chlorine are treated with carboxylic acids having alpha hydrogen atom followed by hydrolysis to form alpha chloro carboxylic acid.

When steel and zinc were connected, zinc is the cathode. The term cathode refers to the electrode that is reduced during an electrochemical reaction.

The electrons are moved from the anode to the cathode during an electrochemical reaction in order to maintain a current in the wire that links the two electrodes.

According to the galvanic series, zinc is more active than iron, meaning that it is more likely to lose electrons and be oxidized. As a result, when steel and zinc are connected, zinc will act as the anode and lose electrons, whereas iron (steel) will act as the cathode and receive the electrons transferred by zinc.

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Deposition is when a gas transitions directly to the solid phase without passing through the liquid phase D) Deposition.

During deposition, the gas molecules lose energy and come together to form a solid substance. This process is the reverse of sublimation, where a solid directly transitions to the gas phase without becoming a liquid.

Deposition refers to the process in which a substance changes directly from a gaseous state to a solid state without passing through the intermediate liquid phase. It is the reverse process of sublimation, where a solid transforms instantly into a gas.

During deposition, the gas molecules lose energy and come together to form a solid structure. This can occur when the temperature and pressure conditions favor the gas to bypass the liquid phase and directly convert it into a solid.

Examples of deposition can be seen in various natural phenomena, such as frost forming on a cold surface or the formation of snowflakes from water vapor in the atmosphere. In these cases, the water vapor bypasses the liquid phase and directly transforms into solid ice crystals through deposition. Therefore, the correct answer is D) Deposition.

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Answer:

Group 15

Explanation:

metal ore

i got this question before and answered this one correctly trust me its right

Answer:

metal ore

Explanation:

Gasoline blending in petroleum refineries involves analyzing the properties of different components and determining the optimal mixing ratios to produce gasoline that meets specific octane rating and quality requirements.

Gasoline blending is a critical process in petroleum refineries where different components are combined to produce the desired gasoline product. In this example, the challenge is to blend gasoline from three different components.

To solve the gasoline blending problem, various factors need to be considered such as the desired octane rating, volatility, and environmental regulations. The first step is to determine the optimal proportion of each component based on their individual characteristics. This involves analyzing the properties of each component, such as its research octane number (RON), motor octane number (MON), and vapor pressure.

The second step is to develop a blending strategy that achieves the desired gasoline specifications. This involves determining the appropriate mixing ratios of the three components to meet the target octane rating and other quality requirements. The blending process requires precise calculations and adjustments to ensure the final gasoline product meets the desired specifications.

Additionally, economic considerations play a role in gasoline blending. The cost of each component and the market demand for specific gasoline grades can influence the blending decisions. Refineries aim to optimize the blend to minimize costs while meeting quality standards.

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Answer:

Solid metal.

Explanation:

At room temperature, Chromium (Cr), a transition metal, is a solid.

Answer:

Positive values of Enthalpy

Explanation:

Got it right on Odessyware. Have a nice day!!!

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