Why is it important to reduce coefficients in a balanced equation to the lowest possible.

Answer:

Bb

Explanation:

In order to demonstrate that intramolecular forces are stronger than intermolecular forces, a block of ice will be heated in a sealed container until it turns into steam.

Because the forces holding together compounds are stronger than the forces holding together molecules, intramolecular forces are stronger than intermolecular forces.

Intermolecular forces exist between molecules, but intramolecular forces exist between atoms within a molecule. This is the primary distinction between intermolecular and intramolecular forces.

Look for the molecule with the most polarity, the most electronegative atoms, or the most hydrogen bonding groups if the molecules have identical molar weights and similar intermolecular forces. That one will have the overall stronger IMFs.

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Tetraamminedichloridoiron(3) nitrate

Answer:

Renewable energy

Explanation:

on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.

Answer:

renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.

fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.

To rank the following monomers from most to least able to undergo anionic polymerization, we need to consider the reactivity of each monomer towards anionic polymerization.

The ranking of monomers from most to least able to undergo anionic polymerization is as follows:

Butadiene is the most reactive towards anionic polymerization due to the presence of conjugated double bonds, which enhance the stability of the carbanion intermediate. Styrene is also relatively reactive due to its aromatic structure, which provides stabilization for the carbanion intermediate. Vinyl chloride is the least reactive of the three due to the presence of electron-withdrawing groups, which decrease the stability of the carbanion intermediate.

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Answer:

It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.

Explanation:

Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

When you increase the concentration, there is more of a substance, and therefore more opportunities for the reactants to collide together with enough energy to create a product.

Answer:

A) It increases when the concentration of reactants increases.

Explanation:

It's just right!!!

If you increase the volume of a container while keeping temperature and number of moles constant, the gas pressure will decrease. This is because the volume and pressure of a gas are inversely proportional according to Boyle's Law, which states that at a constant temperature, the product of pressure and volume is constant.

As the volume increases, the pressure must decrease to maintain the constant product. Therefore, the gas pressure decreases when the volume increases while keeping temperature and number of moles constant, according to Boyle's Law.

If you increase the volume of a container while keeping temperature and number of moles constant, the gas pressure will decrease. This occurs because the gas particles have more space to move around, resulting in fewer collisions with the container walls, which leads to a decrease in pressure.

This phenomenon correlates to Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when temperature and number of moles are held constant (P1V1 = P2V2).

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Answer:

A)-4.00 M/min

Explanation:

hope it helps

Answer:

An atom containing 11 electrons

Explanation:

Metal atoms form ions by a loss of electrons whereas non-metal atoms form ions by the gain of electrons.

The group 1 elements or alkali metals form lose their one valence shell electrons when forming ions; Group 2 metals lose two while Group 3 lose three. On the other hand, non-metal atoms found in Group 5, 6, and 7 forms ions by gaining one, two and three electrons respectively.

Using the electronic configuration of atoms, their groups in the Periodic Table can be determined.

An atom containing 6 electrons has the configuration 2,4 and thus belongs to Group 4.

An atom with 2 electrons belongs to Group 2

An atom with 11 electrons has the configuration 2,8,1 and thus belongs to Group 1

An atom with 10 electrons has the configuration 2,8 and thus belongs to Group 8

An atom with 8 electrons has the configuration 2,6 and thus belongs to Group 6.

From the above, it can be seen that an atom containing 11 electrons belongs to Group 1 and will lose an electron to form an ion.

No, the separation of two compounds would not have been successful, if 1:2 (hexane:ether) was used first both compounds would move down the column together.

Separating mixtures into Their pure components are an important part of organic chemistry. For example, a chemist wants to purify a crude extract of a medicinal plant.

Column Chromatography : This technique is performed by packing the adsorbent ina glass tube, as shown below. There are many types of adsorbents (solid and phases)used in column chromatography, and the choice of adsorbent depends on the typeof compounds to be separated. Used Adsorbent in it are silica gel and alumina. Silica gel is used to separate various compounds such as hydrocarbons, alcohols, ketones, esters, acids, and azo compounds and amines. The column can be developed with a single solvent or a solvent gradient. For example, if the column is initiallydeveloped with a less polarsolvents such as hexane and evolution evolvesas fractions are collected, changethe solvent to 1:2 hexane-methylene chloride. Polar gradients areused for mixtures of compounds with widely different polarities.

Solvent : A common non-polar solvent in both thin layer and chromatography is hexane. Can be used for various polar solvents.

Elution Sequence: The approximate elution sequence is primarily based on polarity and compounds arehydrocarbons, olefins, ethers, halocarbons, aromatics, ketones, aldehydes, esters, alcohols, amines, and acids.

Important point is that the more polar the solvent, the faster The compound will elute, regardless of the compound's polarity.

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Answer:

The car has been on the road for 0.49 hours

Explanation:

A car is traveling 35 miles/hr for 17 miles.

Speed of a car = 35 miles/hr

Distance travelled = 17 miles

The relationship between speed, distance, and time is given by

Distance = Speed × Time

Put Speed = 35 miles/hr, Distance = 17 miles

\(17=35\) × Time

Time = \(\frac{17}{35}=0.49\) hours

So, the car has been on the road for 0.49 hours

The time car has been on the road has been 0.49 hours. Thus, option D is correct.

Speed can be defined as the distance traveled by the object in unit time. The speed can be expressed as:

\(\rm Speed\;=\;\dfrac{Distance}{Time}\)

The car has been given to be traveling at:

Speed = 35 miles/hr

Distance traveled = 17 miles.

The time taken by car to travel 17 miles can be calculated by substituting the values as:

\(\rm 35\;miles/hr\;=\;\dfrac{17\;miles}{Time}\\\\\\\\Time\;=\;\dfrac{17\;miles}{35\;miles/hr}\)

Time = 0.49 hr.

The time taken by car to travel 17 miles has been 0.49 hours. Thus, the correct option has been D.

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The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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Answer:

Th answer is b. convection.

Explanation:

As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.

The evidence that might prove Tasha is right if she and Marco examine a cell through a microscope and Tasha suggests that the cell is a protist is the presence of organelles and cell nucleus.

A eukaryotic cell such as observed in protists contains organelles and a cell nucleus where the genetic material is found compartmentalized, conversely to bacteria which are prokaryotic cells that do not contain a cell nucleus nor membrane-bound organelles.

Therefore, with this data, we can see that eukaryotic cells contain cell nuclei and organelles.

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The best choice for screening a person's genetics for 1,000 or more genes would be: C. Sequencing.

Sequencing techniques, such as next-generation sequencing (NGS), are well-suited for screening a large number of genes efficiently and comprehensively. NGS allows for high-throughput sequencing of DNA, enabling the simultaneous analysis of multiple genes or even the entire genome. It provides detailed information about the sequence of nucleotides in the DNA, allowing for the identification of genetic variations, mutations, or other genomic features.

Microarray analysis (A) is a technique that can analyze gene expression patterns or detect specific genetic variations, but it is limited in the number of genes it can assess simultaneously compared to sequencing.

RELP analysis (B) is a technique used for detecting genetic variations based on restriction enzyme digestion patterns, but it is more suitable for specific target regions rather than screening a large number of genes.

Karyotyping (D) involves the visualization and analysis of chromosomes to detect large-scale chromosomal abnormalities but is not suitable for screening a large number of individual genes.

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The 40%  is the percentage of oxygen in the vessel.

What is pressure ?

As force applied per unit area, pressure is defined. P=FA, where F is the force operating perpendicular to the surface area A, gives it mathematical expression. The pascal (Pa), which equates to a newton per square metre (N/m 2), is the accepted unit of pressure.

What is partial pressure ?

The idea of partial pressure arises from the fact that each individual gas contributes a portion of the total pressure, and that portion is the partial pressure of that gas. In order to describe all the pieces, it is essentially like taking a percentage or fraction of the whole.

Therefore, The 40%  is the percentage of oxygen in the vessel.

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The correct option is 4. 3.62 L.Given reaction:2 Al (s) + N2(g) → 2 AIN (s), Mass of aluminum = 8.50 g

Molar mass of aluminum, Al = 27 g/mol

Number of moles of Al=Given mass/Molar mass

=8.50/27

= 0.3148 moles of Al

The stoichiometry of the reaction indicates that 2 moles of Al reacts with 1 mole of N2 gas.

Therefore, moles of N2 gas required to completely react with 0.3148 moles of Al = (1/2) × 0.3148

= 0.1574 mol of N2 gas

The ideal gas law is given by PV = nRT

Let us rearrange it as n = PV/RT, where P, V, T and R are the pressure, volume, temperature and gas constant, respectively. Substituting the given values and converting the temperature to Kelvin we get,n= [(1.35 atm) × V] / [(0.08206 L atm K-1 mol-1) × (105 + 273) K]n

= (1.35 V) / (0.08206 × 378)n

= 0.0476 V

Where n is the number of moles of N2 gas and V is the volume in liters.

Let us substitute the number of moles of N2 gas in the above equation,0.1574 mol = 0.0476 V

Therefore,V = 3.30 L

So, the volume of N2 gas required to completely react with 8.50 g of Al is 3.30 L, measured at 1.35 atm and 105 °C. Therefore, the correct option is 4. 3.62 L.

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The correct option is: E. CO(g)+3Fe2O3( s)→CO2( g)+2Fe3O4( s).

Since both ΔU and ΔH are related to the internal energy of a system, the answer is e. For this reaction, the change in enthalpy is the same as the change in internal energy, as there is no significant work being done by or on the system other than the transfer of heat.

The enthalpy change of a reaction is equal to the change in internal energy plus any work done by or on the system at constant pressure, according to the first law of thermodynamics. Since none of the other reactions involves significant gas-related work, the other options in the question would have different values for ΔH and ΔU.

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If have an unknown quantity of gas at a pressure of 1.7 atm, a volume of 7.2 liters, and a temperature of 73 °C, the number of mole is 0.0042moles.

In chemistry, a mole, sometimes spelt mol, is a common scientific measurement unit for significant amounts of extremely small objects like atoms, molecules, or even other predetermined particles. The mole signifies  6.022×10²³ units, which is a very big quantity.

Under the International System of Units (SI), the mole is defined as this quantity as of May 20, 2019, according the General Meeting on Weights and Measurements. The amount of atoms discovered via experimentation to be present in 12 grams pure carbon-12 was originally used to define the mole.

P×V = n×R×T    

1.7 × 7.2= n×8.314×346

n =12.24/ 2876.6

 = 0.0042moles

Therefore, the number of mole is 0.0042moles.

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Explanation:

Overfishing is the removal of a species of fish from a body of water at a rate that the species cannot replenish, resulting in those species becoming underpopulated in that area.

Answer:

Since the gastropod is not unique, it cannot be an index fossil. An index fossil must be found over a wide area of the Earth. Since the gastropod is widely spread, it cannot be an index fossil.

Explanation:

To neutralize all the phosphoric acid, you would need to weigh out a certain amount of sodium carbonate. The balanced equation for the reaction between phosphoric acid (H₃PO₄) and sodium carbonate (Na₂CO₃) is:

2 H₃PO₄ + 3 Na₂CO₃ → 6 H₂O + Na₃PO₄ + 3 CO₂

To determine the amount of sodium carbonate needed, we need to consider the weight percentage of H₃PO₄ and the stoichiometric ratio between H₃PO₄ and Na₂CO₃.

To calculate the amount of sodium carbonate needed to neutralize all the phosphoric acid

1. Calculate the amount of H₃PO₄: If the phosphoric acid is 85% H₃PO₄ by weight, this means that 85 grams of every 100 grams of the acid is H₃PO₄. Therefore, if we have a certain mass of phosphoric acid, we can determine the mass of H₃PO₄ by multiplying it by 0.85.

2. Convert the mass of H₃PO₄ to moles: To determine the stoichiometric ratio between H₃PO₄ and Na₂CO₃, we need to convert the mass of H₃PO₄ to moles. This is done by dividing the mass of H₃PO₄ by its molar mass, which can be calculated by adding the atomic masses of hydrogen (H), phosphorus (P), and oxygen (O) in H₃PO₄.

3. Use the stoichiometric ratio: From the balanced equation, we can see that 2 moles of H₃PO₄ react with 3 moles of Na₂CO₃. This means that the stoichiometric ratio between H₃PO₄ and Na₂CO₃ is 2:3.

4. Calculate the amount of Na₂CO₃: Multiply the moles of H₃PO₄ by the stoichiometric ratio. This will give us the moles of Na₂CO₃ needed to neutralize the given amount of H₃PO₄.

5. Convert moles to grams: Finally, multiply the moles of Na₂CO₃ by its molar mass to calculate the mass of Na₂CO₃ needed.

By following these steps, we can determine the amount of sodium carbonate (Na₂CO₃) that should be weighed out to neutralize all the phosphoric acid.

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Answer:

During photosynthesis, plants absorb carbon dioxide and sunlight to create fuel, glucose and other sugars for building plant structures. This process forms the foundation of the fast carbon cycle.In all four processes, the carbon dioxide released in the reaction usually ends up in the atmosphere.

Answer:

During photosynthesis, plants also absorb carbon dioxide and sunlight to create fuel, glucose, and other sugars for building plant structures. This process forms the foundation of the fast carbon cycle.

Explanation:

hope this helps

pls mark me brainliest

Answer:

please mark as brainliest

Explanation:

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons . The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

example:chlorine is an example of an isotope it has a proton number of 17 and a mass number of 35 in some cases they have a proton number of 17 and a mass number of 37 there is difference in the number of neutron to calculate this we do it this way.for the first one

mass number=proton+neutron

neutron=mass number-proton

neutron=35-17

neutron=18

for the second one

neutron=37-17

neutron=20

Answer: C

Explanation: I have the same question, it’s for summit, my teacher helped me with this question :)

When solutions of ammonium fluoride and potassium hydroxide are combined, the odor that is produced is ammonia. This is because ammonium fluoride is a salt that contains ammonium ions, which can release ammonia gas when combined with a strong base like potassium hydroxide.

The strong base causes the ammonium ions to deprotonate, releasing ammonia gas and forming water and fluoride ions. The ammonia gas has a strong, pungent odor that is often described as being similar to that of cleaning products or cat urine. It is important to handle these chemicals with care and in a well-ventilated area to avoid inhaling the noxious fumes.
The odor detected when solutions of ammonium fluoride (NH4F) and potassium hydroxide (KOH) are combined is ammonia (NH3). This reaction occurs because ammonium fluoride reacts with potassium hydroxide, producing ammonia gas, potassium fluoride (KF), and water (H2O). Ammonia has a distinct, pungent smell, often described as sharp or somewhat unpleasant. This gas is commonly used in cleaning products and as a fertilizer, but in high concentrations, it can be hazardous to human health.

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Answer: Solar eclipse

Explanation:

Answer:

(b)  19.9 moles

Explanation:

To convert from moles Al to moles O₂, you need to multiply the given value by the mole-to-mole ratio of each component. This ratio is constructed via the coefficients in the balanced reaction. The desired unit (moles O₂) should be placed in the numerator to allow for the cancellation of units.

2 Al₂O₃ ----> 4 Al + 3 O₂
                    ^         ^            

26.5 moles Al           3 moles O₂
---------------------  x  ----------------------  =  19.9 moles O₂
                                 4 moles Al