PLEASE HELP!!!


Calculate the PH of an acid solution containing 0.10 M HNO3

Answer:

I believe the answer is True

Answer: True

Explanation:

The low flow fixtures are used in sinks, shower heads and toilets. These are used to conserve water and to fullfill the purpose of water use efficiently.

This saves the freshwater to the maximum. Hence, helps in water conservation a valuable environmental resource.

Answer:

Native Elements; Metallic Elements

Explanation:

Answer:

The correct answer is native elements.

Explanation:

Rather than the free gases found in the atmosphere of the Earth, some twenty elements are found in nature in a pure or almost in a pure form, which is known as the native elements.  

The native elements are differentiated into three families, that is, semi-metals, metals, and non-metals. The most usual native metals that are featured by basic crystal compositions form the three groups, known as the gold group, comprising silver, gold, lead, and copper.  

Answer:

air pollution (CO2 emissions) and deforestation

Explanation:

Answer:

the answer is:
plate tectonics, and Milankovitch cycles

I hope this helps :)

Ionic bonds result from the elements of non metals and the metals.

The ionic bond is the type of the bond which are formed when the two or more atoms will losses the electrons or gain electrons and forms the ions. The ionic bonds formed in between the metals that loses the electrons and the nonmetals which gains the electrons. The ions with the opposite charges will be attract to the one another and this leads to the formation of the ionic bond.

The ionic bond is formed by the complete transfer of the electrons in between the atoms and this type of the compound are called the ionic compounds.

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According to the conversation of mass, mass cannot be created or destroyed. This means whatever is done to one side, must be done to the other.

There are 4 Phosphorus atoms on the left, there must be 4 on the right. To do this, you must multiply the P2O3 by 2 to get 4 Phosphorus atoms and 6 Oxygen atoms. Now to balance the Oxygen atoms, you must multiply the oxygen atoms on the left by 3.

1 P4 + 3 O2 —-> 2 P2O3

Lastly, this equation type is synthesis (combination) because two reactants are becoming a single product.

To balance the chemical equation P4 + O2 -> P2O3, you need to place a coefficient of 5 in front of O2, resulting in the balanced equation P4 + 5O2 -> 2P2O3. This equation represents a synthesis reaction.

A balanced chemical equation is one that has the same number of atoms for each element on both sides of the equation. To balance the given equation, you need to determine the appropriate coefficients for the reactants and products.

In this case, you would balance the equation P4 + O2 → P2O3 by placing a coefficient of 5 in front of O2, resulting in the balanced equation  P4 + 5O2 → 2P2O3. This equation represents a synthesis reaction, where two or more substances combine to form a new compound.

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Answer:

403.176

Explanation:

I hope that the right answer.

Answer:

3.96 g/cm^3

Explanation:

The density of the rock can be calculated using the formula Density=Mass/Volume. Given that the mass of the rock is 127g and it displaces 32.1mL of water, the density comes out to be 3.96g/mL.

The density of an object can be calculated using the formula Density = Mass / Volume. In this case, the mass of the rock is 127 grams and the volume is 32.1 mL (the amount of water displaced by the rock). So, the density would be calculated as follows:

Density = 127 grams / 32.1 mL = 3.96 g/mL

This indicates that the density of the rock is 3.96 g/mL. This means that for every milliliter of volume, the rock has a mass of 3.96 grams.

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Answer:

75.15 mol.

Explanation:

Fe₂O₃ + 3CO → 2Fe + 3CO₂.

It is clear that 1.0 mole of Fe₂O₃ reacts with 3.0 moles of CO to produce 2.0 moles of Fe and 3.0 moles of CO₂.

∴ Fe₂O₃ reacts with CO with (1: 3) molar ratio.

no. of moles of Fe₂O₃ = mass/molar mass = (4000 g)/(159.69 g/mol) = 25.05 mol.

Using cross multiplication:

1.0 mole of Fe₂O₃ needs → 3.0 moles of CO,

∴ 25.05 mole of Fe₂O₃ needs → ??? moles of CO.

∴ The no. of moles of CO needed = (3.0 mol)(25.05 mol)/(1.0 mol) = 75.15 mol.

Final answer:

To react with 4000 g of Fe2O3, 75.15 moles of CO are needed based on the balanced chemical equation Fe2O3 + 3CO -> 2Fe + 3CO2 and the molar mass of Fe2O3.

Explanation:

To calculate the number of moles of CO needed when 4000 g of Fe2O3 reacts, we need a balanced chemical equation. The equation provided in different parts of the question suggests a discrepancy. For consistency, we will use the general reaction of iron(III) oxide with carbon monoxide: Fe2O3 + 3CO -> 2Fe + 3CO2. This stoichiometry of the equation indicates that one mole of Fe2O3 reacts with three moles of CO.

First, we determine the molar mass of Fe2O3, which is approximately 159.7 g/mol. Then, we calculate the number of moles of Fe2O3:

Moles of Fe2O3

= (Mass of Fe2O3) / (Molar Mass of Fe2O3)
                 = 4000 g / 159.7 g/mol
                 = 25.05 moles of Fe2O3

Next, using the stoichiometric ratio from the balanced equation (1 mole of Fe2O3 to 3 moles of CO), we can calculate the moles of CO required:

Moles of CO

= Moles of Fe2O3 × 3
               = 25.05 moles × 3
               = 75.15 moles of CO

Thus, 75.15 moles of CO are needed to react with 4000 g of Fe2O3.

Answer:

The answer is C. elevation.

A contour line connects points of the same elevation.

Answer:

Vinegar is made from the fermentation of dilute alcoholic liquids into acetic acid.

Explanation:

Vinegar is a sour tasting liquid which is produced by the fermentation of dilute alcoholic liquids such as cider, wine and beer.

It is a solution of acetic acid which is more formally also known as ethanoic acid.

The concentration of acetic acid in vinegar is variable as it is used for different purposes with different concentrations.

Cider vinegar is started from apples

Wine vinegar is made from grapes

Malt vinegar is started from barley

White vinegar is made from grain

You can also use peaches or pears

Vinegar is mildly acidic liquid, primarily made as bi-product of the drink industry.

Answer:

i had this on study island the answer is "move a short distance away from the door until they collide with other air particles."

Explanation:

hope this helped :)

The sound wave travels toward Roy as the air particles move up and down with the sound wave but do not move away from the door. Therefore, the correct option is option B.

Sound is a mechanical disturbance that travels through an elastic medium and disrupts an equilibrium condition. It is also feasible to define sound solely subjectively, as something which is heard, however this definition is overly limited and not very instructive.

Because it is important to discuss sounds that are created by devices like sonar that are not audible to the human ear, like dog whistles. The characteristics of sound waves should be the starting point for studying sound. The sound wave travels toward Roy as the air particles move up and down with the sound wave but do not move away from the door.

Therefore, the correct option is option B.

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The water has higher specific heat capacity which affects the lakes largely in such way that the water in a lake changes temperature slowly.

Evaporation is a process of liquid changing its state to gaseous state at any temperature. Water has high specific heat due to the presence of strong hydrogen bonds. Due to which it requires heat in huge amount to raise the water (in large quantity) temperature.

Thus, the molecules will be unable to gain much kinetic energy that result in changing the temperature very slowly.

Answer:

D. The water in a lake changes temperature slowly.

Explanation:

for plato users

your answer should be “D.”

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A nuclear power plant operating for 60 years typically generates between 1200 to 1800 tons of high-level nuclear waste. This waste is highly radioactive and needs to be stored safely to avoid environmental contamination. Despite this, nuclear power plants help reduce carbon emissions compared to fossil fuel-powered plants.

The amount of nuclear waste produced by a power plant operating for 60 years depends on several variables, such as the type of reactor and the fuel it uses. However, in general terms, a typical nuclear reactor generates about 20 to 30 tons of high-level nuclear waste annually. Over 60 years, this accumulates to 1200 to 1800 tons of high-level waste.

High-level waste includes elements like uranium-235, which result from the fission process in the reactor. This waste is highly radioactive and requires proper management and disposal methods. Long-term storage solutions often include secure facilities such as old salt mines or inside of stable mountains to prevent environmental contamination.

It's essential to mention that while nuclear power plants produce this level of harmful waste, they also help to mitigate climate change by reducing carbon emissions. Compared to coal-fired power plants, which can produce 370,000 metric tons of CO2 every day, nuclear power plants do not emit greenhouse gases during operation.

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Final answer:

In the given chemical reaction between hydrochloric acid and sodium bicarbonate, carbon dioxide (CO2) is the product that is a gas.Therefore, option D is the correct answer.

Explanation:

In the reaction HCl (aq) + NaHCO3 (aq) – NaCl (aq) + H2O (l) + CO2 (g), the product that is a gas is carbon dioxide (CO2). This reaction is typical of an acid (hydrochloric acid, HCl) reacting with a carbonate (sodium bicarbonate, NaHCO3), where the formation of carbon dioxide gas, water, and a salt (sodium chloride, NaCl) is observed. Such reactions often lead to effervescence due to the release of CO2 gas.

Answer:

the sun is supposed to in the middle instead of earth since the planets rotate around the sun. on the side Here are the planets listed in order of their distance from the Sun:

Mercury: ...

Venus: ...

Earth: ...

Mars: ...

Jupiter: ...

Saturn: ...

Uranus:

There can be several issues with solar system models including incorrect scale and distances, incorrect order of planets, missing objects, or improper representation of elliptical orbits.

Without seeing the actual model, it is difficult to specify what could be wrong with it. However, common inaccuracies in solar system models include incorrect scale of planets and distances, incorrect order of planets, missing objects like dwarf planets or asteroid belts, or not demonstrating the elliptical nature of orbits. Solar system models should accurately represent the distances between planets, the size and scale of each planet, and the elliptical nature of their orbits around the sun.

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Answer:-

Name of element = Lead

Symbol ♾ of Lead = Pb

Atomic no. = 82

Atomic mass = 207.2 amu

No. of protons = 82

No. of electrons = 82

Yes, lead(Pb) is a metallic element and certainly it has 6 electron shells which means 6 energy level.

If you find anything unclear you can ask me...

Final answer:

The element with 6 energy levels, metallic properties, and 82 electrons is lead (Pb). This can be deduced from its position in the Periodic Table, specifically in period 6 and group 14, with an electron configuration that places its highest energy valence electrons in the sixth energy level.

Explanation:

To identify the element described as having 6 energy levels, being metallic, and containing 82 electrons, we should first refer to the Periodic Table. Elements with 6 energy levels are located in period 6 of the Periodic Table. The metallic element with 82 electrons is the well-known lead (Pb), which sits in the carbon family, group 14. It has the electron configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² 6p², indicating that the valence electrons (the electrons in the highest energy level) are in the sixth energy level. Lead is considered a representative metal because it is not a transition metal nor an inner transition metal, and its valence electrons fill the p orbitals after the s orbitals have been filled.

Furthermore, periodic trends such as metallic character help confirm that lead is the correct answer, as it has the properties expected of metals, such as the ability to lose valence electrons, and demonstrates high thermal and electrical conductivity.

Answer:

2.5 x 10⁻² ≅ 3.0 x 10⁻² M.

Explanation:

Molarity is defined as the no. of moles of a solute per 1.0 L of the solution.

M = (no. of moles of solute)/(V of the solution (L)).

∴ M = (mass/molar mass)of AgNO₃/(V of the solution (L)).

∴ M of AgNO₃ = (17.0 g / 169.87 g/mol)/(4.0 L) = 2.5 x 10⁻² ≅ 3.0 x 10⁻² M.

Answer: [tex]3\times 10^{-2}mol/L[/tex]

Explanation:

Molarity of a solution is defined as the number of moles of solute dissolved per Liter of the solution.

[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]

where,

n= moles of solute

[tex]V_s[/tex] = volume of solution in ml

moles of solute =[tex]\frac{\text {given mass}}{\times {\text {molar mass}}=\frac{17g}{170g/mol}=0.1moles[/tex]

Now put all the given values in the formula of molarity, we get

[tex]Molarity=\frac{0.1moles\times 1000}{4000ml}=0.03mole/L=3\times 10^{-2}M[/tex]

Thus molarity of the solution will be [tex]3\times 10^{-2}M[/tex]

Answer:

0.7561 g.

Explanation:

2Al + 6HCl → 2AlCl₃ + 3H₂,

It is clear that 2.0 moles of Al react with 6.0 mole of HCl to produce 2.0 moles of AlCl₃ and 3.0 mole of H₂.

no. of moles of Al = mass/atomic mass = (6.8 g)/(26.98 g/mol) = 0.252 mol.

Using cross multiplication:

2.0 mol of Al produce → 3.0 mol of H₂, from stichiometry.

0.252 mol of Al need to react → ??? mol of H₂.

∴ the no. of moles of H₂ that can be prepared from 6.80 g of aluminum = (3.0 mol)(0.252 mol)/(2.0 mol) = 0.3781 mol.

mass of H₂ = (no. of moles)(molar mass) = (0.3781 mol)(2.0 g/mol) = 0.7561 g.

Answer:

These examples could be written as chemical reactions, but are more generally considered to be endothermic or heat-absorbing processes: Melting ice cubes. Melting solid salts. ... Converting frost to water vapor (melting, boiling, and evaporation, in general, are endothermic processes.

Explanation:

Answer:

Endothermic reactions are those that absorb energy in the form of heat.

In endothermic reactions the products have more energy than the reagents, this means that they do not occur exponentially.

Also in endothermic reactions is one whose enthalpy value is positive, that is, the system absorbs heat from the environment (ΔH> 0).

Some examples of endothermic reactions

The chemical decomposition of water into hydrogen and oxygen.

The plants' photosynthesis.

The production of ozone.

The decomposition of carbon dioxide to obtain carbon and oxygen.

Decomposition of proteins.

The decomposition of calcium carbonate

Answer: Hydration

Hydration is the process of solute particles being surrounded by water molecules arranged in a specific manner. Hydration helps to stabilize aqueous solutions by preventing the positive and negative ions from coming back together and forming a precipitate.

The process where solute particles become surrounded by water molecules when they dissolve is called solvation, or more specifically, hydration when water is the solvent. This allows polar or ionic solutes to form electrolyte solutions that can conduct electricity.

When a solute dissolves in water, the water molecules are attracted to and surround the individual solute particles. This process is known as solvation. If the solute is a liquid or a solid, its particles are separated from each other and completely surrounded by water molecules, entering the solution. When water is the solvent involved in solvation, the process is specifically called hydration. This is because water's polar nature allows it to engage in hydrogen bonding with the solute, effectively surrounding and isolating them within the solution.

Recall the rule that like dissolves like, which implies that a solute and solvent with similar intermolecular forces are likely to form a solution through the process of solvation or hydration. When ionic or polar solutes dissolve in water, they form electrolyte solutions which can conduct electricity, while nonpolar solutes form nonelectrolyte solutions that do not conduct electricity.

Answer:

Very Likely B.

Explanation:

Increasing temperature inside a closed container - keeping everything constant will make pressure increase. Because the energy being held by the molecular (the gas molecules) rises, the container may expand meaning the volume increases.

Heated air would go into the solution in the milk if the air in a carton of milk was allowed to warm up with increased pressure. Hence, option B is correct.

Intermolecular forces hold multiple molecules together and determine many of a substance's properties.

Increasing temperature inside a closed container while keeping everything constant will make pressure increase due to a rise in the randomness of the molecules.

The volume of the air would attempt to increase with temperature, so the carton (if flexible) could begin to swell under the increased pressure, possibly to the point that it would leak out of the carton or even burst the seam.

Also, but of less importance, more of the heated air would go into the solution in the milk.

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Answer:

A

Explanation:

What the equation is tell you is that for every 3 mols of NO2 you get 2 mol of HNO3

3 mol NO2 / 2 mol HNO2 ===> 300.00 mol NO2 / x   Cross multiply

3x = 2 * 300

3x = 600                 Divide by 3

3x/3 = 600/3           Do the division

x = 200.00

Answer:

THIS BOY NEED SOME MILK!!!!

Explanation:

Also the answer is 200.00 lol

Answer:

5.231 L.

Explanation:

M = (no. of moles of KCl)/(Volume of the solution (L))

M = 6.5 M.

no. of moles of solute = 34.0 mol,

Volume of the solution = ??? L.

∴ (6.5 M) = (34.0 mol)/(Volume of the solution (L))

∴ (Volume of the solution (L) = (34.0 mol)/(6.5 M) = 5.231 L.

Answer: A

The pitch of sound waves increases as the source approaches the receiver and the pitch will decrease when the source moves away from the receiver.

A

As the source approaches you, the sound waves are compressed so the pitch of the noise increases. It is all relative to the individual, as the sound gets closer, the waves get closer and closer making the pitch appear higher to an individual.

Antartic polar ice is the answer.

The correct answer is D. Antarctic polar ice.

 A freshwater reservoir is a place where freshwater is stored. The options given include bodies of water and ice formations, so let's evaluate each one:

A. Gulf of Mexico: This is a body of water connected to the Atlantic Ocean and is saline, not freshwater.

 B. Pacific Ocean: This is the largest ocean on Earth and contains saltwater, not freshwater.

C. Atlantic tidal basin: Tidal basins are typically found along coastlines where rivers meet the sea. The water in these basins is a mix of freshwater and saltwater, known as brackish water, but it is not a freshwater reservoir.

D. Antarctic polar ice: This option refers to the ice sheets and glaciers found in Antarctica. These are massive accumulations of freshwater in the form of ice. When this ice melts, it provides freshwater. Therefore, the Antarctic polar ice is indeed a freshwater reservoir.

In conclusion, the Antarctic polar ice is the only option that represents a freshwater reservoir, making option D the correct choice.

Answer:

E. better schools

Explanation:

This contributes the most to human development in his community because it provides children with more resources and better opportunities than a sub-par education system. If a community is able to better their school system, they will begin to see a lot of positive changes in their area.

Answer:

E. better schools

Explanation:

It's the only one that falls into the category in human development .

Answer: options C and D

Explanation: in Redox reaction (oxidation-reduction), oxidation numbers of Reactant and product are different.

In oxidation, oxidation state increases and decreases in the case of Reduction.

In C, oxidation state of C is increased from +3 in C3H6 to +4 in CO2 hence oxidation and oxidation of O2 Decreased from 0 to -2 in H2O, hence Reduction. So it is a redox reaction

Similarly in D, Fe: +3 to 0

Carbon : +2 to +4.

Oxidation-reduction (redox) reactions involve changes in oxidation number and the transfer of electrons. Examples include reactions of magnesium with oxygen copper with silver nitrate and hydrogen peroxide with manganese dioxide.

Oxidation-reduction (redox) reactions are those in which one or more elements involved undergo a change in oxidation number. These reactions can be identified by the transfer of electrons from one reactant to another. Examples of oxidation-reduction reactions include the reaction of magnesium with oxygen to form magnesium oxide, the reaction of copper with silver nitrate to form copper nitrate and silver, and the reaction of hydrogen peroxide with manganese dioxide to form water and oxygen.

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Carbon dioxide is named for its two oxygen atoms bonded to one carbon atom; the 'di-' prefix indicates two oxygen atoms. CO is named carbon monoxide instead, as the 'mono-' prefix is dropped when only one atom of the first element is present. Different numbers of oxygen atoms result in different compounds with distinct names and properties.

The origin of the name carbon dioxide comes from its chemical composition. Carbon dioxide is a compound made up of one carbon atom and two oxygen atoms. In chemical nomenclature, the prefix 'di-' stands for two, indicating the presence of two oxygen atoms. Thus, the name carbon dioxide tells us that there are two oxygen atoms bonded to a single carbon atom. The nearly universal practice in chemical nomenclature is to drop the prefix 'mono-' when there is only one atom of the first element, so CO2 is not called carbon monoxide but carbon dioxide.

Furthermore, compounds like CO (carbon monoxide) and CO2 require different names because they contain different numbers of oxygen atoms, which significantly changes their properties. When forming the names of these molecular compounds, the element that is more metallic (furthest left and/or bottom in the periodic table) is named first. Then follows the name of the more nonmetallic element (furthest to the right and/or top), with its ending changed to '-ide', and prefixed with a Greek numeral prefix to represent the number of atoms, if greater than one. Consequently, CO2 is named carbon dioxide due to the two oxygen atoms in its structure.

[tex]A_r(x)+A_r(y)=A_r(z)[/tex]