explain why the ground-state electron configurations of cr and cu are different from what we might expect.

Answer:

The group name is Noble gases

I guess Noble gasses I think

Answer:

Explanation:

The graph shows the phase diagram of water . From it , it is clear that at 100°C water remains in equilibrium with water vapour and at this temperature , the vapour pressure is equal to one  atm . So this must be boiling point of water.

At 0.7 atm pressure , boiling point must have been reduced . So when water is at 100°C , it must have been completely in vapour phase .

Now the pressure is increased to 1.4 atm . In this process of increase of pressure , the water in vapour state must have turned into liquid state as soon as the pressure increases beyond  1 atm . Beyond it its boiling point would have increased above  100°C so it can not remain in gaseous phase . At 1.4 atm , its boiling point would have increased to 110°C or so . Hence it must be in liquid phase because its temperature is below its boiling point at that pressure .

Hence water changes from gaseous phase to liquid phase when pressure changes from 0.7atm to 1.4 atm .

Answer:

Sodium oxide NA2O

2) N8CL

3) HO2

4) LISO3

Answer:

Sodium oxide NA2O

2) N8CL

3) HO2

4) LISO3

Explanation:

Answer:

there are 60 dimes in 6 dollars

When an imine is reduced to an amine, a hydrogen signal is observed in the nuclear magnetic resonance (NMR) spectrum that is indicative of the newly formed amine group.

Specifically, a broad singlet peak is typically observed in the NMR spectrum at around 2-3 ppm, which corresponds to the protons attached to the nitrogen atom in the amine.

This peak is distinct from the peak observed for the protons attached to the carbon atoms in the molecule, which typically appear as sharp peaks at around 0-2 ppm in the NMR spectrum.

Additionally, the chemical shift of the amine proton peak is typically lower than that of the imine proton peak, which is typically observed at around 6-8 ppm in the NMR spectrum.

Therefore, the presence of a broad singlet peak at around 2-3 ppm in the NMR spectrum is strongly indicative that the imine has been successfully reduced to the amine.

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The ta swirls the erlenmeyer flask containing benzoic acid and ethanol to facilitate the mixing of the two substances. Swirling the flask helps to increase the surface area of contact between the benzoic acid and ethanol, allowing for a more efficient and thorough mixing process.

When the ta swirls the flask, it creates a vortex within the liquid, causing the substances to come into closer contact with each other. This helps to speed up the dissolution of the benzoic acid in the ethanol. Swirling also helps to distribute heat evenly throughout the mixture, which can aid in the dissolution process if the reaction is exothermic.

Additionally, swirling the flask can prevent the formation of local concentration gradients within the liquid. This is particularly important when dealing with substances that may have different densities or solubilities. Swirling the flask ensures that the mixture remains homogeneous and prevents the formation of any localized areas of high or low concentration.

Overall, swirling the erlenmeyer flask containing benzoic acid and ethanol helps to promote efficient mixing, dissolution, and homogeneity of the two substances. It allows for a more effective reaction and ensures that the desired outcome is achieved.

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Answer:

Li2SO4+H2CO3

Explanation:

put d equation this way

negative ions to positive ions

Answer:

All objects can have the same size but have a different mass!

This is true, although it sounds fake. This is one example, there is a Neutron star, and Neutron stars are as big as a city, but they have a mass which is hundreds of times greater than our sun's mass. Because of them having so much mass, they are also having so much gravitational energy, which makes them also have gravity. They're so small, but have so much mass that they can do much. Even a drop of a neutron star can punch open the earth! It's true, so yes, it is possible for objects the SAME size to be having different masses according to that example.

But let's look on how they can have different mass.

They can have different masses becase of different densities. Put a iron ball inside water, and put an apple as close to the iron ball's side, what happens? The apple floats, becuase the apple's mass is less than the water, and the iron ball's mass is MORE than the water. So, because the iron ball is denser than the apple, that's why, it has more mass than the apple. The apple isn't much dense, it isn't as dense as water or the iron ball. But the iron ball is much more denser than the water. So because of the different material densities of the material, that's why it can have different masses.

Remember to Remember those 2 examples I gave you... (neutron star vs sun, iron ball vs apple on water)

The false statement about the neuromuscular junction acetylcholine (ACh) receptor is c. The opening of the ACh receptor is all-or-none.

The degree to which the ACh receptor opens is dependent on both the amount of neuromuscular junction acetylcholine (ACh) present and the level of receptor activation; it is not an all-or-nothing response. The channel opens when ACh binds to the receptor, causing a conformational shift that permits ion flow.

The following claims are accurate:

ACh concentration affects whether an ACh channel will open, with a larger ACh concentration increasing the likelihood that the channel will open and ion flow.

The net ionic currents through all activated ACh receptors add up to make up the synaptic current, which is defined as the sum of all such currents.

Membrane voltage impacts the likelihood that an ACh channel will open: Membrane voltage has an impact on the likelihood that an ACh channel will open. In general, hyperpolarization lowers and depolarization enhances the likelihood of a channel opening.

The patch clamp method allows for the measurement of the current flowing through a single receptor, including ACh receptors. This method sheds light on the characteristics and functions of individual ion channels, including ACh receptors.

As a result, c is the erroneous assertion. All or none of the ACh receptor's opening occurs.

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Answer:

39%

Explanation:

The Dry Bulb Temperature (also known as air temperature) is the ambient air temperature.

The Wet Bulb temperature is the temperature of adiabatic saturation.

The relative humidity is the amount of water vapor in the air. The relative humidity can be gotten from the dry bulb and wet bulb temperature. The difference between the wet bulb and dry bulb temperature as well as the dry bulb temperature is used to determine the relative humidity with the help of a Psychrometric Chart

Given that the dry-bulb temperature is 8˚C and the difference between the wet and dry-bulb temperatures is 6˚C. From the chart:

Relative humidity = 39%

Answer:

39% I believe is correct.

Answer:

1. LiCi is formed by the treatment of lithium carbonate with hydrochloric acid

2. A combination reaction (also known as a synthesis reaction) is a reaction where two or more elements or compounds (reactants) combine to form a single compound (product).  

3. Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity into two or more fragments.

4. A single-displacement reaction, also known as single replacement reaction or exchange reaction, is a chemical reaction in which one element is replaced by another in a compound

5. Double replacement reactions have two ionic compounds that are exchanging anions or cations.

6. The most electronegative elements are found on the top right of the periodic table.

7. cesium

8. Electronegativity describes the degree to which an atom attracts electrons in a chemical bond. But the electronegativity of two atoms would determine their bond type.

9. ionic bond

10. polar covalent bond

11. fluorine

12. Matter can change form through physical and chemical changes, but through any of these changes, matter is conserved. The same amount of matter exists before and after the change.

Hope i was able to help!!!

Answer:

New substances formed when breaking of bonds take place and new bonds get formed which results in formation of new products. That breaking of bond is a chemical change because in such a process composition of substance gets changed and forms a new substance.

Explanation:

I think option 3..............

When adding ice to a hot soup, it is generally recommended to use ice made from potable or drinkable water.

The water used to make the ice should be clean and free from any contaminants that could affect the taste or safety of the soup.

It is advisable to use filtered or purify water to make the ice to ensure that it is of good quality. This helps prevent any unwanted flavors or impurities from transferring to the soup.

Using tap water can also be acceptable if it meets the drinking water standards in your area and is considered safe for consumption. However, if you have concerns about the quality of your tap water, using filtered water is a safer option.

Ultimately, the goal is to add ice made from water that is safe and of good quality to avoid any negative impact on the taste or safety of the soup.

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The balanced chemical equation for P + O₂⇒ P₂O₅ is:                                4P + 5O₂ ⇒ 2P₂O₅.

Equations are balanced when they have the same number of each element on both the reactant and product sides. Equations need to be balanced in order to express the conservation of mass rule appropriately.

To balance chemical equations, stoichiometric coefficients for the reactants and products are necessary. Because a chemical equation must adhere to the rules of conservation of mass and constant proportions, the reactant and product sides of the equation must have an equal number of atoms of each element.

This substance has great dehydrating power (since it undergoes hydrolysis in an exothermic manner).

Several organic synthesis processes also employ phosphorus pentoxide. For instance, it is applied for making nitriles from primary amides.

It is an essential part of the Onodera reagent, which is frequently employed in the oxidation of alcohols.

Moreover, this substance can be used to change several mineral acids into their anhydrides. For instance, P₂O₅ can be used to create N₂O₅ from HNO₃ as an example.

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Randomness. It is simply the measure of disorder.

Answer:

V=10 l H2O

VM=22.4 l/mole

n=V/Vm=0.446 moles H2O

the ratio 1:2

x:0.446

x=0.223 moles O2

Answer:

Group

Explanation:

Elements in the same group have similar chemical properties due to them having the same number of electrons in their outer shell

We have that for the Question "Which ionic compound would be expected to have the highest lattice energy?" it can be said that

Generally, lattice enthalpy depends on the product of charges on the ion as well as the distance between them.

The more vivid factor is the part of charge,

Therefore,

\(In_2O_3\) has a product of 6 which is maximum  

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1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

To burn 1 molecule of C3H8 completely, 5 molecules of O2 are required. This reaction can be written as follows:
C3H8 + 5O2 → 3CO2 + 4H2O
The balanced equation shows that for every molecule of C3H8 burned, 5 molecules of O2 are needed to completely react with the carbon and hydrogen in the fuel. This information can be useful for calculating the amount of oxygen required for a given amount of fuel, as well as for understanding the environmental impact of burning hydrocarbons.
To burn 1 molecule of propane (C3H8) in a complete combustion reaction, you need 5 molecules of oxygen (O2). The balanced chemical equation for this reaction is: C3H8 + 5O2 -> 3CO2 + 4H2O. In this reaction, 1 molecule of propane combines with 5 molecules of oxygen to produce 3 molecules of carbon dioxide (CO2) and 4 molecules of water (H2O).

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Answer:

19.8% of Nitrogen

Explanation:

In the Al(NO₃)₃ there are:

1 atom of Al

3 atoms of N

And 9 atoms of O

The molar mass of Al(NO₃)₃ is:

1 Al * (26.98g/mol) = 26.98g/mol

3 N * (14g/mol) = 42g/mol

9 O * (16g/mol) = 144g/mol

26.98 + 42 + 144 = 212.98g/mol

We can do a conversion using these molar masses to find the mass of nitrogen is the sample, that is:

2.57g * (42g/mol / 212.98g/mol) =

0.51g N

Percent composition of nitrogen is:

0.51g N / 2.57g * 100

= 19.8% of Nitrogen

The new pH of the solution after the addition of water would be 13.22.

V(total) = 609 ml + 594 ml

V(total) = 1203 ml

C = (594 ml)/(1203 ml)

C = 0.493

pOH = -log(0.493)

pOH = 0.31

New pH of the solution = 13.5292 - 0.31 = 13.22

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The balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

Given equation: 3O2+4Co⟶2Co2O3Using the symbol e− for an electron. The redox reaction can be broken down into two half-reactions. The reduction half-reaction is the one in which a species gains electrons and the oxidation half-reaction is the one in which a species loses electrons. The half-reactions are as follows: Reduction Half-reaction Half-reaction equation: O2 + 2e- → 2O2 -Oxidation number of oxygen in O2=0 and in O2^-= -1Charge on the left side = 0Charge on the right side = 2 x (-1) = -2Thus, 2 electrons are added to the left side to balance the charge, making the half-reaction:O2 + 2e- → 2O2 -Oxidation Half-reaction Half-reaction equation: 4Co → 4Co2+ + 8e-Oxidation number of cobalt in Co=0 and in Co2+ =+2Charge on the left side = 0Charge on the right side = 4 x (+2) + 8 x (-1) = -4Thus, 8 electrons are added to the right side to balance the charge, making the half-reaction:4Co → 4Co2+ + 8e-Thus, the balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

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Answer:

positive ions are smaller than their parent atoms and negative ions are larger than their parent atoms.

Answer:

wax, candlewick, and oxygen

Explanation:

The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.

Answer: This is the process of chemical change. Examples of chemical properties are flammability (a material's ability to burn in the presence of oxygen) and reactivity (how easily a material combines chemically with other materials).

Explanation: Chemical properties are properties that can be measured or observed only when matter undergoes a change to become an entirely different kind of matter. They include reactivity, flammability, and the ability to rust. ... Flammability is the ability of matter to burn. Burning of wood is a chemical change as new substances which cannot be changed back (e.g. carbon dioxide) are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. ... Special details which do not change in a substance without new substances being formed are called physical properties.

Answer:

chemical property

Explanation:

1. Chromatography or high-performance liquid chromatography method we can use to determine the composition of your mixture.

2.  40% enantiomeric excess and composition of the mixture.

1. We need to compare the particular rotation you determined to the literature value of pure limonene (+115.5°) in order to ascertain whether your sample is pure.

Our sample is pure if the values are in agreement. If the results are different, your sample is likely impure and contains other chemicals.

We might employ a number of methods, like gas chromatography or high-performance liquid chromatography, to ascertain the mixture's composition.

We might distinguish the different components and their relative quantities using these procedures, which would separate the mixture's constituents based on their physical and chemical characteristics.

2. A combination of enantiomers' observed rotation can be represented as follows:

Observed rotation

= (% R enantiomer × specific rotation of R enantiomer) + (% S enantiomer × specific rotation of S enantiomer)

Let x be the % enantiomeric excess of the R enantiomer,

The % composition of the mixture can be expressed as:

% R enantiomer = (50 + x)/100

% S enantiomer = (50 - x)/100

By substituting these expressions into the observed rotation equation, we get:

25 = ((50 + x)/100) × (+45°) + ((50 - x)/100) × (-45°)

By simplifying this equation gives:

x = 40%

Therefore, the mixture contains 70% R enantiomer (50% + 40%) and 30% S enantiomer (50% - 40%).

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Answer:

C. N₂O₄ → N₂ + 2O₂

General Formulas and Concepts:

Chemistry - Reactions

Explanation:

Step 1: Define

N₂O₄ decomposes into N₂ and O₂

Step 2: RxN

Unbalanced RxN:   N₂O₄ → N₂ + O₂

Balanced RxN:   N₂O₄ → N₂ + 2O₂