Which of the following is not a polyatomic ion

The answer would be A.

Reason Brownsted-lowry Acid donates protons and the opposite for Brownsted-lowry Base

Answer:

A - acid;base

Explanation:

same atomic number..

Number is the answer.

Hope this helps.

The primary advantage of multiple researchers obtaining the same result is that it makes the result of the researches more reliable, and the chances of a mistake are minimized.

If only one research is made, by a single person or team, on certain thing, the result of the research can not be seen as reliable. The reason for this is that the research has not been repeated numerous times, and the chances of a mistake are much higher, thus making the research not very trustworthy.

On the other hand, if multiple researches or teams of researches are doing a research on the same thing, and they do come to the same result, than we can say that the result is much more reliable. The reason for that is that multiple different people or teams have conducted multiple researches, and the result is always the same, thus meaning that is is reliable, and the chances of a mistake are much more minimized.

About 7.272 moles. Hope this helps!

There are 7.26 moles in 425.0 g of sodium chloride

HOW IS NUMBER OF MOLES CALCULATED?

no. of moles = mass ÷ molar mass

23 + 35.5

= 58.5g/mol

no. of moles = 425g ÷ 58.5g/mol

no. of moles = 7.26moles

Therefore, there are are 7.26 moles in 425.0 g of sodium chloride.

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Answer: Increase

Explanation:

According to Gay-Lussac's Law, the temperature of the gas would increase with increase in pressure on it while keeping the volume constant as the law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas, when the volume is kept constant.

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Final answer:

If the pressure of a gas is increased while keeping the volume constant, the temperature of the gas will increase. This is a direct consequence of Gay-Lussac's Law, where pressure and temperature are directly proportional to each other in these conditions.

Explanation:

When the pressure of a gas is increased and the volume is kept constant, according to Gay-Lussac's Law, the temperature of the gas must increase. This is because pressure and temperature are directly proportional in a contained gas when the volume is constant. So, if you increase the pressure, the temperature will also increase as the particles will collide more frequently and with greater energy against the walls of the container, which relates to an increase in temperature.

Now let's address the other scenarios briefly:

Boyle’s law states that for a fixed amount of gas the pressure of gas is inversely proportional to the volume of the gas at constant temperature.

P1v1 = P2v2

Where P1 is pressure and v1 is volume at first instance

And P2 is pressure and v2 is volume at second instance

Substituting the values

3 atm x 5 L = P2 x 7.5 L

P2 = 2 atm

The new pressure of the expanded volume of gas is 2 atm

3 ethyl, 4 methylheptane. The compound is named by first identifying the longest carbon chain in the structure. in this case the chain has seven carbon atoms thus the prefix hept-.

Next you identify the substituent groups attached to the long carbon chain and name them from the lowest value of the integer assigned to the carbon atoms from either side. From the right, the ethyl group is attached to carbon number 3 while from the left, the methyl group is attached to carbon number 4. We therefore start with the right and name the attached groups first, including the carbon atoms to which they are attached.

Then we also take into consideration the highest number of bonds between the carbon atoms which is one from the question. Thus the suffix -ane is added if a maximum of one bond, -ene,if two bonds and -yne if three bonds.

They would observe erosion when you pour acid on rock that chemical erosion which feeds away at the item quicker than normal erosion.

A geologist would observe fizzing and bubbling when acid is poured on a sculpture made of materials like limestone or marble. This is due to the chemical reaction between acid and calcium carbonate in the rock, releasing carbon dioxide gas. Over time, acid rain can erode and damage such sculptures and monuments.

If a geologist poured acid on a sculpture, particularly one made of limestone or marble, they would likely observe a reaction where the acid would fizz and bubble upon contact with the rock. This reaction occurs because these types of rocks contain calcium carbonate, which reacts with acids like sulfuric acid and nitric acid commonly found in acid rain. The bubbling effect is due to the release of carbon dioxide gas as the calcium carbonate is dissolved.

Over time, acid rain can have a deleterious impact on sculptures and monuments made from these materials. It can cause erosion, degradation, and loss of detail in the art and architecture. This chemical weathering results from the acidic environment created by acid rain, which is capable of slowly dissolving the stone's surface. As seen in various photographic records, such as those in Greenwood cemetery or on the Notre Dame cathedral, the damage can be extensive, leading to significant alterations in the appearance and structural integrity of affected sculptures and buildings.

A is your answer

They're producers, they provide nutrients for primary consumers which get eaten by secondary consumers then scavengers come in and clean up the mess :)

Aspen trees in a mountain area serve as the role of producers. They convert sunlight, water, and carbon dioxide into glucose for their survival and for providing nourishment for the primary consumers.

In a mountain area, aspen trees serve as producers. Producers are organisms in an ecosystem that produce their own food through photosynthesis, like plants and particular forms of bacteria. Aspen trees, being plants, convert sunlight, water, and carbon dioxide into glucose which serves as their food. This process of photosynthesis not only allows aspen trees to grow and survive, but also contributes to the overall ecosystem by storing energy and providing nourishment for primary consumers. Hence, they are at the base of the food chain in respective ecosystems.

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Question 2: Biofuel

Question 3: Geothermal

An Improvement is a

The conclusion was that there must be space between the particles of an atom. The way he knew this is because while some of the radiation reflected off of the gold foil, other radiation went right through it.

Answer:

Mass of an atom is concentrated in a positively charged core called the nucleus.

Explanation:

Rutherford gold foil experiment expanded our understanding of the structure of an atom. When positively charged alpha particles were bombarded against a thin gold foil, Rutherford observed that majority of particles passed through the foil undisturbed whereas a small percentage retraced their path.

There were two main conclusions from the experiment:

-Since most alpha particles simply passed through undeviated this suggested that majority of the space inside the atom is empty

- Also, since some of them completely bounced back this suggested that there is a positively charged core in which the mass of the nucleus is concentrated.

B.The rate of forward reaction increases.

Answer:

B

Explanation:

I took the test

This is a Functional Group

Functional groups are responsible for chemical reactions of molecules.

One mole of any element contains the same number of atoms as one mole of any other element.

Moles is define as the ration of the given mass of any substance to the molar mass of that substance.

In one mole of any substance, exact 6.022 × 10²³ number of atoms of that substance will present and this number is know as the Avogadro's number. For example, in 1 mole of O₂ molecule 6.022 × 10²³ number of oxygen molecules are present.

Hence, option (2) is correct.

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Answer:

P.E = 25.48 J

Explanation:

Given data:

Mass = 2 Kg

Height = 1.3 m

Potential energy = ?

Solution:

Formula:

P.E = m . g . h

P. E = potential energy

m = mass in kilogram

g = acceleration due to gravity

h = height

Now we will put the values in formula.

P.E = m . g . h

P.E = 2 Kg . 9.8 m /s² . 1.3 m

P.E = 25.48 Kg. m² / s²

 Kg. m² / s² = J

P.E = 25.48 J

Answer:

PE= 25.48 J

Explanation:

m= 2 kg

h= 1.3 m

PE= ?

m= 2 kg

h= 1.3 m

PE= ?

1 skeleton equation

Na +O2 =>Na2O

Balanced equation

4Na + O2 =>2 Na2O

2.word equation

Zinc +magnesium phosphide=magnesium + zinc phosphide

Balanced equation

3Zn +Mg3P2 =3Mg+ Zn3p2

3skeleton equation

Al +Br2 =>AlBr3

Balanced equation

2Al +3Br2 => 2AlBr3

4 word equation

Lithium + sulphur =>lithium sulphide

2Li + S => Li2S

= 553.28 mmHg

According Boyle's the volume of a fixed mass of a gas is inversely proportional to pressure at constant temperature.

P1V1 =P2V2

P1 = 988 mmHg

V2 = 0.56 L

V2 = 1.0 L

P2 = ?

P2 = P1V1/V2

     = (988 × 0.56)/1

      = 553.28 mmHg

Boyle's Law explains the relationship between gas pressure and volume at constant temperature and amount of gas. By applying Boyle's Law formula, we can calculate the gas pressure in the new 1.0 L flask. The pressure in the new flask is approximately 554.86 mm Hg.

Boyle's Law: Boyle's Law states that the pressure of a gas is inversely proportional to its volume when the temperature and amount of gas remain constant.

Using Boyle's Law formula, we can calculate the new pressure in the 1.0 L flask: P1V1 = P2V2. Plugging in the values, (988 mm Hg)(0.56 L) = P2(1.0 L), we find P2 = 554.86 mm Hg.

The gas pressure in the new 1.0 L flask will be approximately 554.86 mm Hg.

Answer:

584.4 g.

Explanation:

Na₂CO₃ + 2HCl → 2NaCl + H₂O + CO₂.

It is clear that 1.0 mole of Na₂CO₃ reacts with HCl to produce 2.0 moles of NaCl.

Using cross multiplication:

1.0 mole of Na₂CO₃ → 2.0 moles of NaCl.

5.0 moles of Na₂CO₃ → ??? moles of NaCl.

The no. of moles of NaCl produced from 2.0 moles of Na₂CO₃ = (2.0 mol)(5.0 mol)/(1.0 mol) = 10.0 mol.

∴ The theoretical yield of NaCl = no. of moles of NaCl x molar mass of NaCl = (10.0 mol)(58.44 g/mol) = 584.4 g.

A, it gets bigger, you can tell by its atomic mass and electron configuration

Answer:

A

Explanation:

Answer:

D. The reaction will be spontaneous at any temperature.

Explanation:

∵ ΔG = ΔH - TΔS

where, ΔG is the free energy change.

ΔH is the enthalpy change,

ΔS is the entorpy change.

ΔG = (- ve) - T(+ ve) = - ve value.

ΔG will be negative at all temperatures.

So, The reaction will be spontaneous at any temperature.

Answer:

2516 J.

Explanation:

Q = m.c.ΔT.

where, Q is the amount of heat required to raise the T of water,

m is the mass of water (m = 85.9 g),

c is the specific heat of ethanol in the gas phase (c = 4.184 J/g °C),

ΔT is the temperature difference (final T - initial T) (ΔT = 7.0 °C).

∴ Q = m.c.ΔT = (85.9 g)(4.184 J/g °C)(7.0 °C) = 2516 J.

[tex]\\ \rm\Rrightarrow Q=mc\delta T[/tex]

[tex]\\ \rm\Rrightarrow Q=85.9(4.184)(7)[/tex]

[tex]\\ \rm\Rrightarrow Q=2515.83J[/tex]

Final answer:

The energy involved in a phase change depends on the number and strength of bonds or force pairs.

Explanation:

The energy involved in a phase change depends on the number and strength of bonds or force pairs. The number of bonds is proportional to the number of molecules and thus to the mass of the sample.

The energy per unit mass required to change a substance from the solid phase to the liquid phase, or released when the substance changes from liquid to solid, is known as the heat of fusion.

The energy per unit mass required to change a substance from the liquid phase to the vapor phase is known as the heat of vaporization.

The strength of the forces depends on the type of molecules. The heat Q absorbed or released in a phase change in a sample of mass m is given by:

Answer:

Reducing the volume of a contained gas by one third, while holding temperature constant, causes pressure to increase by 3.0 times.

Explanation:

So, for two different values of both P and V:

∴ P₁V₁ = P₂V₂.

∵ V₂ = 1/3V₁

∴ P₂ = P₁V₁/V₂ = P₁V₁/(1/3V₁) = 3P₁.

In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.

The chemical reaction can be distinguished based on the energy released or uptake by the reaction. Or can be differentiated on the basis of the reaction to be constructive or destructive.

The reaction that results in the formation of the new compound has been termed the synthesis reaction.

The reaction that requires energy for the reaction to complete is an endothermic reaction.

The reactions that release energy are termed exothermic reactions.

The ionic reaction results when the ions interact to form the ionic bond.

In the given reaction, the energy has been utilized for the decomposition of the water molecule, hence the reaction has been termed as an endothermic reaction.

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Q=mcat

=(22.6)(.897)(250-25)

4,561.245 or 4.5 * 10^-3

To find the heat absorbed by the aluminum, use the formula Q = mc riangle T. The aluminum will absorb 4554.525 joules of heat when its temperature is increased from 25°C to 250°C.

The question involves calculating the amount of heat absorbed by a sample of aluminum when it is heated from one temperature to another, using the specific heat capacity of aluminum. The formula for heat absorbed or released is Q = mc riangle T, where Q is the heat absorbed, m is the mass of the substance, c is the specific heat capacity, and  riangle T is the change in temperature.

To solve for Q in the given case:

Mass (m) of the aluminum sample = 22.6 g

Specific heat capacity (c) of aluminum = 0.897 J/g°C

Temperature increase ( riangle T) = 250°C - 25°C = 225°C

Now plug in the values: Q = 22.6 g * 0.897 J/g°C * 225°C = 4554.525 J

The aluminum will absorb 4554.525 joules of heat.

Some of the solutions exhibit colligative properties. These properties depend on the amount of

solute dissolved in a solvent. These properties include freezing point depression, boiling

point elevation, osmotic pressure and vapor pressure lowering. From the given choices, the correct answer is the first option. Pure water will have the lowest boiling point because there are no solute particles to change the boiling point of water while other options will have an elevated boiling point because of the solute.

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Answer: A.   pure water

Explanation:

[tex]\Delta T_b=i\times k_f\times m[/tex]

[tex]\Delta T_b[/tex] = change in boiling point

i = Van'T Hoff factor  

[tex]k_f[/tex] = freezing point constant

m = molality

1. For pure water

, i= 1 as it is a non electrolyte and does not dissociate.

2. For [tex]0.5M NaCl[/tex]

[tex]NaCl\rightarrow Na^+Cl^-[/tex]

, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (0.5+0.5)=1M[/tex]

3. For [tex]1M NaCl[/tex]

[tex]NaCl\rightarrow Na^+Cl^-[/tex]

, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (1+1)=2M[/tex]

4. For [tex]2M NaCl[/tex]

[tex]NaCl\rightarrow Na^+Cl^-[/tex]

, i= 2 , as it is a electrolyte and dissociate to give 2 ions and concentration will be (2+2)=4M[/tex]

Thus as vant hoff factor is lowest for pure water and thus the boiling point will be lowest.

Yes they contain natural Sugar.

Final answer:

Yes, lemons contain natural sugars such as glucose, fructose, and sucrose, paired with essential nutrients like Vitamin C, fiber, and potassium. These sugars are part of the fruit's carbohydrates, contributing to its nutritional value and offering a more balanced energy release compared to added sugars.

Explanation:

Yes, lemons contain natural sugars. While lemons are widely recognized for their high Vitamin C content and sour taste due to citric acid, they also contain naturally occurring sugars such as glucose, fructose, and sucrose. These sugars are part of what makes up the carbohydrates in lemons. Unlike added sugars found in processed foods, the sugars in lemons come along with beneficial nutrients like fiber, potassium, and of course, Vitamin C. This combination helps in the slower absorption of sugar into the bloodstream, providing a more balanced energy release and contributing to the nutritional value of the fruit.

Understanding the composition of lemons can be essential for nutritional planning, especially in managing sugar intake. It showcases how naturally occurring sugars in fruits like lemons are part of a healthy diet when consumed in moderation as they are paired with essential nutrients. This contrasts with added sugars, which are not accompanied by these additional health benefits and are often consumed in larger quantities than recommended.

both resistance will have same voltage across it which is equal to 5 volt.

if resistance value is different then voltage drop across them will be different.

current in both resistance would be same.

let's say resistance is 5 ohm of each one.

total current = total voltage / total resistance

= 10 /(5+5) = 10/10 = 1 amp

now voltage across 5 Ohm resistance = current × resistance = 1× 5 = 5 volt

If the same two resistors on a 10 volt series circuit, the voltage going into the second resistor will be the same as that going into the first because they are connected into series.

A resistor is a two terminal electrical component, that control the flow of charge in a circuit.

When the resistor is connected in series, the total voltage across all the resistors will be the same.

Thus, the voltage going into the second resistor will be the same as that going into the first.

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