Changes in which two characteristics can indicate a physical change?

Answer:

V2 = 33L

Explanation:

KNOW THAT:

V1 = 30L

P1 = 2.0atm

T1 = 27 + 273.15 = 300.15k (it's help to be in Kelvin)

P2 = 2.0 atm

T2 = 54 = 273.15 = 327.15

V2 = ?

We have an equation: P1V1/T1 = P2V2/T2

Multiply both side for T2 to remove it, divided both side for P2 to remove it. So we can left with V2, and that is what we want to find.

T2P1V1/T1P1 =>> V2= 33L

Answer:

b be a pure substance

Explanation:

The element with the ground-state electron configuration [xe]6s^2 4f^7 is Gadolinium (Gd).

Gadolinium is a chemical element with the atomic number 64, and it belongs to the lanthanide series of elements. The symbol for Gadolinium is Gd, and it is a silvery-white metal.

The electron configuration [xe]6s^2 4f^7 indicates that Gadolinium has a noble gas core represented by [xe], which refers to the electronic configuration of xenon (Xe). Following the noble gas core, there are two electrons in the 6s orbital and seven electrons in the 4f orbital.

Gadolinium is part of the lanthanide series, which is characterized by the filling of the 4f orbital. The electronic configuration [xe]6s^2 4f^7 corresponds to the filling of seven electrons in the 4f orbital of Gadolinium, completing the 4f subshell.

The ground-state electron configuration provides information about the arrangement of electrons in an atom, and in this case, it specifically identifies the electron distribution of Gadolinium.

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False. A prochiral center does not describe an sp_3 hybridized atom that can become a chirality center by changing one of its attached groups.

A prochiral center is an atom that possesses chirality, meaning it can become a chirality center by changing its stereochemistry. However, the statement in question is incorrect because a prochiral center does not require changing one of its attached groups to become a chirality center.

In contrast, a prochiral center is a type of stereocenter that exhibits chirality due to the presence of two different groups attached to it. It becomes a chirality center when one of the groups is replaced by another group, resulting in the formation of two distinct stereoisomers.

An example of a prochiral center is a carbon atom with three different groups attached to it. Upon substitution of one of the groups, the prochiral center becomes a chirality center, giving rise to enantiomers.

Therefore, the statement that a prochiral center can become a chirality center by changing one of its attached groups is false.

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Answer:

it's physical change because none of the components of the bar of solid have been tampered with so solid to liquid is physical change

The melting of  solid gold into liquid and then being poured into molds is a physical change.

Physical changes are the type of changes which affect the state of a chemical substance,thereby only bringing about physical change but it does not change it's chemical composition.

They are used to separate mixtures into their components. It involves change in physical properties.A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not change.

Melting is a physical change  because physical changes occur to solid which are change in shape,size,density ,volume as well as structure.During melting of gold no  chemical change or reaction takes place.

As the solid gold is melted to make coins and as melting is a physical change which just changes the state of substance.    

Therefore,the melting of gold  to make coins is a physical change.    

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66 infrared photons of frequency 3.38 x 1013 hz would need to be absorbed simultaneously by a tightly bound molecule to break it apart.

What is binding energy?

Binding energy is a required amount of energy that disperses the other particles of the reaction system. It measures the energy needed to free an electron or a subatomic particle.

Binding energy is the ionization energy that depicts how much energy will be needed if an electron has to be removed from an atom for a reaction to occur.

It can be said that the energy required to free an electron from the orbit of the atom is measured in electron volt (eV). It is a little different from ionization energy as binding energy can remove any subatomic particle and not just an electron.

Energy of a photon of frequency v is given by the relation

E = hv

where h has the value 6.63 x 10-34

from this relation the energy of our photon of frequency 3.66 × 1013 Hz is E = 6.63 x 10-34 x 3.66 x 1013 2.42658 × 10-20

Binding energy is the minimum energy required to break the bond which in our case is 10 x 1.6 x 10-19 1.6 x 10-187

so the total number of photons that are required to break the bond are

1.6 x 10-18 2.42658 x 10-20

n = 65.9364

n= 66

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The statement "Chlorophyll is a pigment that gives plants their green color and is essential for photosynthesis." is TRUE.  It is found in the chloroplasts, which are specialized organelles found within the mesophyll cells of leaves. These cells are located in the middle layer of the leaf, sandwiched between the upper epidermis and lower epidermis.

The mesophyll layer is where most of the photosynthesis occurs in a plant. It contains two types of cells: palisade and spongy. The palisade cells are located near the upper epidermis and are responsible for capturing the majority of the light energy needed for photosynthesis. The spongy cells are located near the lower epidermis and are involved in gas exchange, allowing for the uptake of carbon dioxide and release of oxygen.
Chloroplasts are found in both types of mesophyll cells, but are more abundant in the palisade cells. The chloroplasts contain the chlorophyll pigments that absorb light energy and convert it into chemical energy through photosynthesis. This chemical energy is used by the plant for growth, reproduction, and metabolism.
In summary, chlorophyll is located in the chloroplasts of mesophyll cells in leaves. This allows for efficient photosynthesis and energy production in plants.

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Answer:

Explanation:

You aren't truly changing your hair, after all. It will regrow, and it is still hair; nothing has changed. Without changing the actual identity, a physical change can modify one or more physical properties. Therefore, getting a haircut  is a physical change

From the diagram, we see that structure II is the correct answer

in NMR peak spectrum at 12 ppm is only for the carboxylic acid peak

in given options there is only one option with carboxylic acid functional group .therefore the answer is structure 2 is correct answer

The absence of rotation would result in no response, therefore structures are compatible with this spectrum.

A "spectrum" is the term used to describe the variation in light intensity with respect to wavelength or frequency.

A spectrograph is described as  a tool used to record or map the spectrum, as opposed to a spectroscope, which is used to examine spectra visually.

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A hypothesis for this experiment could be stated as "Increasing the temperature of the environment will increase the activity of the enzyme."

This hypothesis can then be tested by performing the experiment, measuring the activity of the enzyme at different temperatures and comparing the results. If the activity of the enzyme increases with temperature, then the hypothesis is supported. If not, then the hypothesis is not supported.

Additionally, further experiments may be conducted to explore the effects of different temperatures on the enzyme activity, as well as the effects of other environmental factors such as pH and oxygen levels. If the hypothesis is supported, then further experiments can be conducted to explore the mechanism of action of the enzyme at different temperatures, and to determine the optimal temperature range for the enzyme's activity.

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Answer:

Water and salt can be separated through the process of distillation or evaporation. The water is boiled till it evaporates into vapor and leaves salt behind as a solid. The boiling point of water is lower compared to the boiling point of salt.

Explanation:

The method of separating salt and water from their solutions​ is called evaporation or condensation

Here are the steps:

1. Pour the saltwater solution into a heat-resistant container, such as a glass or metal beaker.

2. Place the container on a heat source, such as a hot plate or stove.

3. Heat the solution until the water begins to evaporate. The salt will remain in the container as the water turns into steam.

4. Once all the water has evaporated, turn off the heat source and allow the container to cool.

5. As the steam cools, it will condense back into liquid form, leaving the salt behind.

6. Carefully remove the salt from the container using a utensil, such as a spatula or a spoon.

7. Discard the remaining water, or save it for other uses.

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Answer:

0.1169g .

Explanation:

1. Multiply the concentration (0.5 mols/Liters) by the volume of solution you want (0.5 Liters) to find the moles of NaCl you need. 2. Multiply the moles of NaCl by its molar mass (58.44 g/mol) to find the grams of solute needed.

Answer:

Melting point, boiling point, state of matter at room temperature, heat of vaporization, flammability and reactivity

Explanation:

Answer:

1. 2Ca + N\(_{2}\) → 2CaN

2. 4Li + O\(_{2}\) → 2Li\(_{2}\)O

3. 2KCl + BaF\(_2\) → 2KF + BaCl\(_2\)

4. CH\(_4\) + 2O\(_2\) → CO\(_2\) + 2H\(_2\)O

Be sure to balance the number of atoms on both sides of each equation only by adding coefficients to the compounds!!!! Those without a coefficient are meant to have a coefficient of 1.

To determine the molarity of the hydrochloric acid (HCl) and the number of grams of HCl in the solution, we can use the principles of stoichiometry and the balanced chemical equation for the reaction between barium hydroxide (Ba(OH)2) and hydrochloric acid (HCl):

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

a) Molarity of the acid (HCl):

From the balanced equation, we can see that one mole of Ba(OH)2 reacts with two moles of HCl. Therefore, the moles of HCl can be calculated as follows:

Moles of HCl = Moles of Ba(OH)2 = Molarity of Ba(OH)2 × Volume of Ba(OH)2 solution in liters

Moles of HCl = 0.145 M × (34.7 mL / 1000 mL/L) = 0.00504 moles

Since the volume of HCl is not specified, we cannot directly calculate the molarity of the acid. We need additional information, such as the volume of HCl used or the balanced equation stoichiometry.

b) Grams of HCl:

To calculate the grams of HCl, we need the molar mass of HCl. The molar mass of HCl is approximately 36.46 g/mol.

Grams of HCl = Moles of HCl × Molar mass of HCl

Grams of HCl = 0.00504 moles × 36.46 g/mol = 0.184 grams

Therefore,

a) The molarity of the hydrochloric acid (HCl) is not provided in the given information. Additional information is needed to calculate it.

b) The solution contains approximately 0.184 grams of HCl.

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Explanation:

Answer

Open in answr app

The rule used here is that the algebraic sum of the oxidation numbers of all the atoms a molecule is zero.

Al2O32× ( oxidation number of Al)+3× ( Oxidation number of O )  = 0

2× ( Oxidation number of Al) +3(−2)=0

2× ( oxidation number of Al) +6

∴ Oxidation number of Al =+3

The concentration of the ions in the solution cannot be determined from the information provided. To determine the concentration, additional information, such as the initial concentrations of the reactants and any reaction conditions, would be needed.

Generally, Silver chromate (Ag2CrO4) is a chemical compound made of silver, chromium, and oxygen ions. It is an insoluble substance that forms a red precipitate in aqueous solution.

From the information that has been supplied, it is not possible to estimate the amount of ions that are present in the solution.

Additional information, such as the beginning concentrations of the reactants and any circumstances that may be present throughout the reaction, would be required in order to calculate the concentration.

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Answer:

• Reacting aqueous Sodium hydroxide solution with Magnesium chloride.

Explanation:

\({ \rm{2NaOH _{(aq)} + MgCl _{2(s)} \: \dashrightarrow \: 2NaCl _{(s)} + Mg(OH)_{2(aq)} }}\)

Answer:

Sodium hydroxide solution + Magnesium chloride = sodium chloride crystals

Explanation:

Answer:

Hope this helps!

Explanation:

To calculate the pOH of a solution you need to know the concentration of the hydroxide ion in moles per liter (molarity). The pOH is then calculated using the expression: pOH = - log [OH-] Example: What is the pOH of a solution that has a hydroxide ion concentration of 4.82 x 10-5 M?

To find the pOH, simply subtract the pH from 14. In order to calculate the pOH, take the negative log of the hydroxide ion concentration.

The poH equation and how it should be determined from pH should be explained below.

To determine the pOH of the solution here first we know the concentration of the hydroxide ion in terms of moles per liter (molarity). The pOH should be then calculated by applying the following expression.

pOH = - log [OH-]

Now for determining the pOH here we considered the negative log of the  hydroxide ion concentration.

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According to the question the resulting concentration of Na is 0.240 M

Water is the most abundant substance on Earth and the most essential for all living things. Water is a tasteless, odorless, transparent liquid that is essential for all forms of life. Water is composed of two molecules of hydrogen and one molecule of oxygen, and is found in oceans, lakes, rivers, and streams, as well as in the atmosphere in the form of vapor.

The reaction of Na₂CO₃ and NaHCO₃ results in the formation of Na₂CO₃, water and CO₂.

Moles of Na in Na₂CO₃ = (70.0 mL x 3.00 M) / 1000 mL

                                       = 0.210 mol

Moles of Na in Na₂CO₃ = (30.0 mL x 1.00 M) / 1000 mL

                                       = 0.030 mol

Total moles of Na = 0.210 mol + 0.030 mol  

                              = 0.240 mol

Total volume of solution = 70.0 mL + 30.0 mL

                                         = 100.0 mL

Concentration of Na = (0.240 mol) / (100.0 mL)

                                  = 0.240 M

Therefore, the resulting concentration of Na is 0.240 M

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Answer:

n1 = 2, n2 = 4

1/wavelength = 1.097*10^7[1/2^2 — 1/4^2]

1/wavelength =0.20568*10^7

wavelength = 486.192*10^-9 Or

wavelength = 486.19 nm (blue color)

Explanation:

I just answered this in class

Answer:

D. 4Al + 3O2→2Al2O3

There are three main pathways that produce ATP molecules in cells: glycolysis, the citric acid cycle (also known as the Krebs cycle), and the electron transport chain.

The ATP (Adenosine Triphosphate) molecule is the main source of energy for cells. It's the energy currency used by cells to perform various functions.

Of these three pathways, the electron transport chain produces the most ATP molecules. This process occurs in the mitochondria, which are the powerhouse of the cell. In this process, electrons are transferred from molecule to molecule, releasing energy along the way. This energy is used to pump hydrogen ions into the inner membrane space of the mitochondria. When these hydrogen ions flow back through the membrane, they release energy that is used to generate ATP molecules.

The electron transport chain involves four protein complexes, each with its own specific function. These complexes work together to transfer electrons from one molecule to the next, releasing energy as they go. At the end of the chain, the electrons are used to reduce oxygen to form water. This process generates a large amount of energy, which is stored in the ATP molecules.

The electron transport chain produces approximately 34 ATP molecules for each molecule of glucose that enters the mitochondria. This is much more than the 2 ATP molecules produced by glycolysis, and the 2-3 ATP molecules produced by the citric acid cycle.

The activity involved in respiration, known as glycolysis, takes place in the cytoplasm of the cell. The citric acid cycle is the second respiration process that takes place inside the cell's mitochondria.

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After the death of the Buddha, Buddhism became a formal religion through the efforts of his followers, who continued to spread his teachings and organized into communities known as sanghas. Over time, these sanghas developed a system of governance, with monastic councils, hierarchical structures, and formalized practices and rituals.

One key factor in the formalization of Buddhism was the development of the Tripitaka, a collection of the Buddha's teachings, which were written down in the Pali language and preserved by monastic communities. The Tripitaka contains three major sections: the Vinaya Pitaka, which outlines the rules and guidelines for monastic life; the Sutta Pitaka, which contains the Buddha's discourses on a wide range of topics; and the Abhidhamma Pitaka, which provides a detailed analysis of Buddhist psychology and philosophy.
The spread of Buddhism was also facilitated by the patronage of rulers such as Asoka, who supported the religion and helped to spread it throughout his empire. However, this support was not always consistent, and Buddhism faced periods of persecution and decline in various parts of the world. Despite these challenges, Buddhism has continued to evolve and adapt over the centuries, with different schools and traditions emerging in different regions. Today, Buddhism is practiced by millions of people around the world, and continues to offer a unique and powerful perspective on the nature of reality, the human condition, and the path to liberation.

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Answer:

Sugar is sucrose or \(C_{12} H_{22}O{11}\)

Not sure what yo're looking for... Is it molecular? Solid? Nonsystematically named (sucrose)? C12H22O11?

The mole ratio Aluminium to Aluminum Oxide is 2 : 1

Given

Reaction

2Al + Fe ----> Al2O3 +2Fe

Required

The mol ratio

Solution

If we look at the reaction above, there is an element missing from the reactant i.e oxygen, because the number of atoms and elements involved in the reaction should be the same between the reactants and products.

So the possible and balanced reactions are:

2Al(s) + Fe₂O₃ (s)  →  Al₂O₃ (s)+ 2Fe (s)

From this reaction the ratio of Al: Al₂O₃ can be determined, which is 2: 1

Answer:

Explanation:Elements of the periodic table are arranged in order of increasing atomic number. The periodic law states “When elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties.”