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Question 7 (1 point)


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The subscript numbers in covalent compounds can be determined by_____



Question 7 options:



the number of the column in which the element is found




the addition of the charges on each metal




the prefixes used in the written name of the compound




subtraction of the charges on the metal

The celsius temperature of 1.50 moles of ammonia contained in a 10.0-l vessel under a pressure of 2.0 atm can be determined using the ideal gas law.

The ideal gas law states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin. To calculate the temperature in Celsius, the Kelvin temperature is first determined by rearranging the equation and solving for T.

Then, the Kelvin temperature is converted to Celsius by subtracting 273.15 from the Kelvin temperature. In this case, the calculation would be T = (2.0 * 10.0) / (1.50 * 0.0821) = 1100.16 K. Subtracting 273.15 from 1100.16 K yields 827.01 °C, which is equal to 827.01 - 273.15 = -50.0 °C.

In conclusion, the celsius temperature of 1.50 moles of ammonia contained in a 10.0-l vessel under a pressure of 2.0 atm is -50.0 °C.

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Answer:

CO2(C)

Explanation:

This is because there is a mutual sharing of electrons between the atoms or elements...That's to say covalent bond exist between them.

Old volume = 200  cm3.

Pressure = 18 degree

New volume= ?

P1V1/ T1 = P2V2/ T2

200 * 18/ 285 = 18 * V2/ 285. New volume will be 1.86 L.

The space occupied within an object's borders in three dimensions is referred to as its volume. It is sometimes referred to as the object's capacity.

Finding an object's volume can help us calculate the quantity needed to fill it, such as the volume of water needed to fill a bottle, aquarium, or water tank.

Thus, New volume will be 1.86 L.

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Answer:

Shiny solid. Conducts heat and electricity. Easily bends

Explanation:

Answer:

weakness, There are two conditions that lead to a weak volcanic eruption, low viscosity magma and little presence of trapped gases.

strength, The VEI or (Volcanic Explosivity Index)  is a scale that describes the size of explosive volcanic eruptions based on magnitude and intensity. The numerical scale (from 0 to 8) is a logarithmic scale, and is generally analogous to the Richter and other magnitude scales for the size of earthquakes.

Explanation:

i really hope this helps. :)

Coal is abundant and cost-effective, providing stable energy.

Coal extraction damages the environment, and burning it releases high levels of CO2 and air pollutants. Oil has high energy density and infrastructure, but its combustion contributes to climate change and spills cause environmental harm.

Natural gas emits less CO2, is versatile, and is abundant, but extraction techniques like fracking can harm ecosystems and water resources. Nuclear power produces large amounts of electricity without CO2 emissions but faces concerns about radioactive waste disposal and safety risks. Biomass is renewable but competes with food production and can release emissions.

Wind, solar, hydro, and geothermal offer renewable sources, but their scalability, intermittency, and land use impacts vary. Per capita, consumption affects the magnitude of their environmental effects.

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When examining the potential maps for LiH, HF, and H2:

a. HF and H2 are polar compounds because their potential maps show regions of positive and negative charge separated by a distance, indicating an uneven distribution of electron density. LiH is a nonpolar compound because its potential map shows a uniform distribution of electron density between the two atoms.

b. LiH has the largest hydrogen because its bond length is the shortest of the three compounds. A shorter bond length indicates a stronger bond, which requires more energy to break.

c. HF has the hydrogen that would be most apt to attract a negatively charged molecule because its potential map shows the greatest concentration of electron density near the hydrogen atom. This indicates that the hydrogen atom has a high partial negative charge and is therefore more likely to attract a negatively charged molecule.

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The water in the water cycle changes states as it moves through the cycle, it can be a solid, liquid or a gas. The given statement is true.

Condensation is the transformation of a substance from a gas to a liquid. Condensation happens when rain is produced from water vapor that is present in the upper atmosphere as clouds.The dispersal of water from clouds as rain or snow is known as precipitation. In this manner, the water that has evaporated from the atmosphere returns to the planet.

When a water body's liquid water evaporates as a result of the heat in the air, this is known as evaporation. Water vapors are formed when this water evaporates. When water vapor reaches upper atmospheres, clouds start to form. Transpiration is the process by which water is lost by aerated plant components like leaves and stems. The atmosphere receives this water's evaporation.

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Answer:

96.1 %

Explanation:

Which teacher do you have lol

The transition state of a reaction cannot be easily isolated under no circumstance. Option d is correct.

The transition state of a chemical reaction is a high-energy state that exists for a very short period of time during the reaction. It is a fleeting intermediate state in which the reactants have partially transformed into products, and the bonds are breaking and forming simultaneously.

Because the transition state is such a high-energy and short-lived state, it cannot be easily isolated or observed directly. However, it can be inferred from various experimental data and computational techniques such as transition state theory, which provides information about the energy barriers and activation energy required to convert reactants into products.

Therefore, it is not possible to isolate the transition state of a reaction under no circumstance, but its properties can be inferred from indirect measurements and theoretical calculations. Option d is correct choice.

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Answer: 1.45M

Explanation:

The definition of molarity is moles/liter.  The neutralization of NaOH with HI is:

HI + NaOH = NaI  + H2O

One mole of HI reacts with 1 mole of NaOH.  We'll assume this is a titration reaction and that the 10.00ml sample of NaOH contains the same number of moles as the 56.75ml of 0.256M HI.

Moles HI:  (0.256 moles/liter)*(0.05675 L) = 0.01453 moles HI

That means we muct have 0.01453 moles NaOH in 10.0ml of NaOH solution.

(0.01453 moles NaOH)/(0.010L) = 1.45 M

==

Another approach is to use the relationship M1V1 = M2V2, which is useful for titrations (M is concentration and V is volume):

We want M2, so rearrange:  M2 = M1V1/V2

M2 = (0.256M)*(56.75ml)/(10.0ml)

M2 = 1.45M

For a chemical reaction to be spontaneous only at high temperatures, the conditions that must be met are ΔH > 0 and ΔS < 0.

To determine if a chemical reaction is spontaneous at high temperatures, we need to consider the enthalpy change (ΔH) and entropy change (ΔS).

In this case, the condition for a reaction to be spontaneous only at high temperatures is that the enthalpy change (ΔH) must be positive (ΔH > 0) and the entropy change (ΔS) must be negative (ΔS < 0).

A positive ΔH indicates an endothermic reaction, where heat is absorbed from the surroundings. At high temperatures, the increased thermal energy can provide the necessary activation energy for the reaction to occur.

A negative ΔS indicates a decrease in entropy or disorder in the system. Despite the decrease in entropy, the positive ΔH contributes to the overall spontaneity of the reaction at high temperatures, as the increased energy can overcome the unfavorable decrease in entropy.

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Answer:

8.801×10^-18 moles Ca

Explanation:

5.3 X 10^6atoms* (1mol/6.022*10^23) = 8.801×10^-18 moles Ca

A solution is defined as a mixture of two or more substances, usually, a solute and a solvent, and the difference between these two are in quantity, solute represents the smallest amount and solvent will represent the highest amount, and while you can have more than one solute, you can only have one solvent for a solution. Therefore the statement is true

Tectonic forces do not cause plates to slide over and under each other, to produce heat and pressure which forms igneous rocks

The rock cycle is a cycle which describes how the three basic rock types are related and how earth processes convert one rock type into another over geologic time.

Plate tectonic forces together with weathering and erosional processes, are responsible for the rock cycle.

Tectonic forces play the following roles in rock cycle:

Therefore, the statement that when plates slide over and under each other, the heat and pressure form igneous rocks is not True.

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While visiting his uncle's farm, Derek learned that horses and donkeys are two different species. Based on this information, Derek can infer that horses and donkeys are members of different populations.


Since horses and donkeys are different species, they belong to different populations. A population refers to a group of individuals of the same species that live in the same area and can interbreed. While horses and donkeys can mate, their offspring, known as mules, are usually infertile.

This means that mules cannot produce offspring of their own, which indicates that horses and donkeys are not members of the same population. In contrast, if they were members of the same population, they would be able to produce fertile offspring. Therefore, Derek can infer that horses and donkeys are members of different populations.

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The formula for the compound depicted in the image above is Al₂O₃ (option D).

Chemical or molecular formula is a notation indicating the number of atoms of each element present in a compound.

The chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs.

According to this question, two atoms of aluminium and three atoms of oxygen were given. This means that when they chemically combine, the chemical formula of the resulting molecule will be Al₂O₃.

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The pH of a 0.15 M NH4Cl solution is 8.42.

The solution contains the NH4Cl salt which is the salt of a weak base (NH3) and strong acid (HCl). The NH4+ ion is acidic in nature and can undergo hydrolysis in water to produce H+ ions. The NH3 is a weak base, and it can accept the H+ ions produced in the solution to form NH4+ ions.

The hydrolysis reaction is as follows: NH4+ + H2O ⇌ NH3 + H3O+

Using the Kb expression for NH3, we can write:

Kb = [NH3][OH-] / [NH4+]

1.76 x 10^-5 = x^2 / (0.15 - x)

Assuming x is small, we can simplify to:

x = [OH-] = 1.33 x 10^-3 M

pOH = -log[OH-] = 2.88

pH = 14 - pOH = 11.12

Therefore, the pH of the solution is 11.12.

The solution contains the NaC2H3O2 salt, which is the salt of a weak acid (HC2H3O2) and strong base (NaOH). The acetate ion (C2H3O2-) is basic in nature and can undergo hydrolysis in water to produce OH- ions. The HC2H3O2 is a weak acid, and it can donate H+ ions in the solution.

The hydrolysis reaction is as follows: C2H3O2- + H2O ⇌ HC2H3O2 + OH-

Using the Ka expression for HC2H3O2, we can write:

Ka = [H+][C2H3O2-] / [HC2H3O2]

1.8 x 10^-5 = x^2 / (0.12 - x)

Assuming x is small, we can simplify to:

x = [H+] = 1.08 x 10^-4 M

pH = -log[H+] = 3.97

Therefore, the pH of the solution is 3.97.

The solution contains the NaCl salt, which is the salt of a strong acid (HCl) and strong base (NaOH). Since both the ions (Na+ and Cl-) are neutral in nature, the solution is neutral. Therefore, the pH of the solution is 7.

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You omitted what it was raised to the power in 1.3 x 10's gallons of water,  so i will put it up as   1.3 x 10^15 gallons of water and solve with it

Answer:1,083,333 days

Explanation:

Total amount of water held by lake Michigan= 1.3 x 10^15 gallons of water

Amount of water Chicago uses per day =Chicago uses 1.2 x 10^9 gallons of water /day

Therefore,

Number of days water would last if it doesnt rain =  Total gallons provided by lake Michigan/ Total gallons consumed per day

=1.3 x 10^15 gallons of water/ 1.2 x 10^9 gallons of water /day

= 1,083,333 days

Answer:

262 ppm of Na₃PO₄

Explanation:

In a dilution, the concentration of the initial solution is decreased. When you take 5.00mL of the solution that is diluted to 25.0mL The solution is diluted 25/5 = 5 times

If you make another two serial dilutions the final solution wil decrease its concentration 5*5*5 = 125 times

As original solution containing 0.200 M of Na3PO4, the final solution will have a concentration of:

0.200M / 125 = 1.6x10⁻³M

Molarity is defined as the ratio between moles and liters. 1.6x10⁻³ moles of Na3PO4 in 1L are:

1.6x10⁻³mol ₓ (164g/mol) = 0.262g Na₃PO₄ / L

Assuming density of Na3PO4 as 1g/mL the concentration of the solution is:

0.262mL Na₃PO₄ / L

As 1mL = 1000μL:

262μL Na₃PO₄ / L

μL of solute per L of solution is equal to ppm, that means the solution has:

Answer:

a) Methanol + Ethanoic acid → Methyl ethanoate + Water

CH3OH + CH3COOH → CH3COOCH3 + H2O

Ester formed: Methyl ethanoate

b) Methanol + Methanoic acid → Methyl methanoate + Water

CH3OH + HCOOH → HCOOCH3 + H2O

Ester formed: Methyl methanoate

c) Butanol + Propanoic acid → Butyl propanoate + Water

CH3CH2CH2CH2OH + CH3CH2COOH → CH3CH2CH2CH2COOCH2CH3 + H2O

Ester formed: Butyl propanoate

d) Propanol + Butanoic acid → Propyl butanoate + Water

CH3CH2CH2OH + CH3CH2CH2COOH → CH3CH2CH2COOCH2CH5 + H2O

Ester formed: Propyl butanoate

e) Ethanol + Pentanoic acid → Ethyl pentanoate + Water

CH3CH2OH + CH3CH2CH2CH2COOH → CH3CH2CH2CH2COOCH2CH3 + H2O

Ester formed: Ethyl pentanoate

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Answer:

The patented TRUE-TECH Self-Heating Technology is a simple combination of food grade iron and magnesium powder, salt, and water. When the contents of the water pouch are poured over the heater pad, the Food Heater releases enough heat to warm-up a pre-cooked meal 100 degrees Fahrenheit in approximately 10 minutes.

Explanation:

Ranking the compounds in terms of their potential to catalytically destroy ozone in the stratosphere from highest to lowest:

CFCl3 (CFC-11)

CHFCl2 (HCFC-123)

CF3Cl (CFC-13)

CHF3 (HFC-23)

Ozone destruction in the stratosphere is primarily driven by the presence of halogen-containing compounds, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). These compounds contain chlorine (Cl) and/or fluorine (F), which can act as catalysts in the destruction of ozone.

CFCl3 (CFC-11):

This compound contains three chlorine atoms and no fluorine atoms. Chlorine is highly reactive with ozone and acts as an efficient catalyst in the destruction of ozone. CFCl3 is one of the most potent ozone-depleting substances, with a high ozone depletion potential (ODP) value. It remains in the atmosphere for a long time, allowing its catalytic effect on ozone destruction to persist.

CHFCl2 (HCFC-123):

This compound contains one chlorine atom and one fluorine atom. HCFCs are considered transitional substances between CFCs and hydrofluorocarbons (HFCs) due to their lower ODP values. While HCFC-123 has a lower ODP compared to CFCl3, it can still contribute to ozone depletion as the chlorine atom can catalytically destroy ozone. However, its impact is lower due to the presence of the fluorine atom, which makes it less reactive towards ozone.

CF3Cl (CFC-13):

This compound contains three fluorine atoms and one chlorine atom. Fluorinated compounds generally have a lower ODP compared to chlorinated compounds as fluorine is less reactive towards ozone. While CF3Cl does contain a chlorine atom, the presence of three fluorine atoms makes it less effective as a catalyst for ozone destruction compared to CFCl3.

CHF3 (HFC-23):

This compound contains three fluorine atoms and no chlorine atoms. HFCs are non-ozone depleting compounds and do not contribute to the destruction of stratospheric ozone. CHF3, commonly known as HFC-23, does not have any catalytic effect on ozone destruction due to the absence of chlorine. It is considered a greenhouse gas with a high global warming potential (GWP), but it does not directly impact ozone depletion.

In summary, CFCl3 (CFC-11) has the highest potential to catalytically destroy ozone in the stratosphere, followed by CHFCl2 (HCFC-123), CF3Cl (CFC-13), and CHF3 (HFC-23). The presence of chlorine atoms in the compounds increases their ozone-depleting potential, while the presence of fluorine atoms reduces their reactivity towards ozone. It is important to note that the production and use of ozone-depleting substances, such as CFCs and HCFCs, have been phased out under international agreements like the Montreal Protocol to protect the ozone layer.

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Majority of lithium atoms on earth are positively charged.

3 protons and 3 electrons respectively, make up a lithium atom. It might become an ion if one of its electrons is lost. It now has a net positive charge since there are more positive protons than negative electrons. It is a positive ion as a result.

An atom of the chemical element lithium is known as a lithium atom. Three electrons connected by the electromagnetic force to a nucleus with three protons and either three or four neutrons, depending on the isotope, are what make up stable lithium. The nucleus is held together by  strong force.

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Answer:

B

Explanation:

A student plucks a string on a guitar to play a note. The student makes the sound softer by decreasing the amplitude by plucking with less force. Therefore, option B is correct.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity, since it has both magnitude and direction.

Contact forces and act at a distance forces are the two different types of forces. Your daily use of force is evident. Basically, push and pull are forces. You exert force on an object when you push against it or pull against it.

Because it explains the ensuing interaction between two masses, gravity is in fact a force. Fundamentally, the warping of spacetime and the motion of objects through the stretched spacetime are what produce gravitational effects.

Thus, option B is correct.

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Answer:

Monosaccharides, these are the simplest building block of carbs

Explanation:

Answer: check out the image

Explanation: check out the image

Among the given compounds, CO₂ is a compound that is not ionic.

In this question, we have been given four compounds - CaCl₂, CO₂, (NH₄)₂O, and NaI and among these four compounds, we have to tell which compound is not ionic.

A compound can be ionic or covalent. And the compound which is not ionic is also called a covalent compound.

So let us comment on each compound one by one.

CaCl₂ - It is an ionic compound because it is a compound formed between a metal and a non-metal. As a general rule, any compound formed between a metal and a nonmetal is called an ionic compound and a compound between a nonmetal and a nonmetal is called a covalent compound.

(NH₄)₂O - Though this is a compound containing no metallic element, it is still an ionic compound.  NH₄⁺ is an ion, though still a nonmetal. We should remember that NH₄ compounds are exceptions to this rule. All compounds of NH₄ are actually ionic. Hence (NH₄)₂O is an ionic compound.

NaI - It is again a compound made of a metal and a nonmetal. Hence, according to the rule stated above, it is an ionic compound.

CO₂ - It is a compound made of a nonmetal and a nonmetal. Therefore, it is a covalent compound

Hence, among the above-given compounds, CO₂ is a covalent compound.

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Given :

The heat of  vaporization for water is 2330 J/g.

To Find :

How many grams of water can be vaporized with 6500 J of energy.

Solution :

It is given that heat of  vaporization for water is 2330 J/g.

Means 2300 J of heat is required to vaporize 1 g of water .

Let , n grams of water is produced by 6500 J of energy .

\(n=\dfrac{6500\ J}{2330\ J/g}\\\\n=2.79\ g\)

Therefore, 2.79 g of water will vaporize by 6500 J of energy .

Hence, this is the required solution .