Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a 0. 15 m salt solution become limp and soft. From this we can deduce that:.

Answer:

i think its c

The ionic compound from the options listed is : ( C )   H₂O₂

Ionic compounds are compounds formed by positively charged ions ( cation ) and negatively charged ions ( anions ) and they are neutrally charged because they are made up of equal number of positive and negative ions.  

Ionic compounds are formed and held together by the electrostatic forces between the ions. Some examples of ionic compounds include ; Table salt ( NaCl ) , potassium chloride ( KCl )  

Hence we can conclude that the ionic compound from the options listed is )   H₂O₂.

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Answer:

D

Explanation:

Glucose is produced through a process powered by sunlight that consumes Carbon Dioxide and produces oxygen as a waste product.  In order for glucose to be produced, Carbon dioxide (a compound) must be, in essence, converted into a completely different chemical: dioxygen.

Photosynthesis is biochemical process by which green plants produce energy and release oxygen. Glucose is produced in this reaction and thus it is a chemical change. Thus, option D is correct.

The change in a substance if involves any bond making or bond breaking then it is called a chemical change. Whereas, if the substance just changes from one phase or state to the other it is called a physical change.

All chemical reactions are chemical changes involving bond making or breaking or both. Photosynthesis is a biochemical reaction takes place in plant leaves with the aid of light energy.

Photosynthesis involves several stages where an electron transport chain, various oxidising and reducing agents are performing significant roles.

The net reaction in photosynthesis is the combination of water and carbon monoxide to form molecular oxygen and glucose. Therefore, there occurs bond making and breaking. Thus option D is correct.

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Answer: Red Plate Dinner

Explanation:

If we calculate them with formula for area of circle(\(\pi\)\(r^{2}\)).

Red Plate - \(\pi\)\(6^{2}\) = 36\(\pi\)

2 Yellow Plate - 2 * \(\pi\)\(3^{2}\) = 2 * 9\(\pi\) = 18\(\pi\)

The Red Plate has a bigger area, so the Red plate has more area.

Please mark as brainliest, and take care.

Answer: Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons.

Explanation:

Answer:

2.6 mol HCl

Explanation:

Step 1: Write the balanced equation

2 KMnO₄ + 8 HCl ⇒ 3 Cl₂ + 2 MnO₂ + 4 H₂O + 2 KCl

Step 2: Calculate the number of moles of hydrochloric acid needed to react with 0.64 moles of potassium permanganate.

According to the balanced equation, the molar ratio of KMnO₄ to HCl is 2:8.

0.64 mol KMnO₄ × 8 mol HCl/2 mol KMnO₄ = 2.6 mol HCl

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Option 1 is correct compound. 2-bromopentanal and pentanal do not have alpha-hydrogens and therefore cannot undergo aldol addition reaction in aqueous sodium hydroxide.

Out of the given options, only 2-methyl pentanal and 3-chloropentanal can undergo aldol addition reaction in the presence of aqueous sodium hydroxide. This is because both of these compounds have alpha-hydrogens (hydrogens attached to the carbon adjacent to the carbonyl group), which are necessary for the aldol reaction to occur.

Aldol condensations play an important role in the creation of organic compounds because they provide a dependable way to create carbon-carbon bonds. For instance, the Robinson annulation reaction sequence results in aldol condensation, and the Wieland-Miescher ketone product is an essential component in a variety of chemical synthesis processes.

In the aldol reaction between 2-bromopentanal pentanal  and a 2-methyl pentanal, the mechanism for the aldol addition product and the aldol condensation product is described .

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The complete question is

select the compound(s) can undergo an aldol addition reaction in the presence of aqueous sodium hydroxide? options: 1. ,2-bromopentanal pentanal option 2.  2-methyl pentanal option 3. 3-chloropentanal

On the analysis of the first and second laws of thermodynamics, we can only conclude that the process satisfies the first law (energy conservation) but it cannot be determined whether it satisfies the second law (entropy).

To determine whether the given process is possible, we need to analyze whether it satisfies the first and second laws of thermodynamics.

First Law of Thermodynamics (Energy Conservation):

The first law states that energy is conserved in a closed system. For an adiabatic process (no heat transfer), the first law can be expressed as:

ΔQ = ΔU + ΔW

Where:

ΔQ is the heat transferred to the system (in this case, zero),

ΔU is the change in internal energy, and

ΔW is the work done on the system.

Since ΔQ = 0 for an adiabatic process, the first law simplifies to:

ΔU = -ΔW

To analyze whether the process satisfies the first law, we need to compare the change in internal energy (ΔU) with the work done (ΔW).

For an ideal gas, the change in internal energy can be expressed as:

ΔU = nCpΔT

Where:

n is the number of moles of gas,

Cp is the molar heat capacity at constant pressure, and

ΔT is the change in temperature.

For the given process, we have two equal flows, so n is the same for both flows.

For Flow 1:

ΔU₁ = nCp(70°C - 20°C)

For Flow 2:

ΔU₂ = nCp(-30°C - 20°C)

Since the gas is claimed to be separated into two equal flows, the change in internal energy for each flow should be equal in magnitude but opposite in sign.

Therefore, ΔU₁ = -ΔU₂

Now, let's analyze the work done on the system.

For an adiabatic process, the work done can be expressed as:

ΔW = C(ΔP/γ)

Where:

C is a constant,

ΔP is the change in pressure, and

γ is the adiabatic index (specific heat ratio) for the gas.

Since the process involves expansion, ΔP = P₃ - P₁ = 0.1 MPa - 0.8 MPa = -0.7 MPa (note the negative sign due to the expansion).

Now, let's compare ΔU and ΔW:

ΔU₁ = -ΔU₂

nCp(70°C - 20°C) = -nCp(-30°C - 20°C)

50°C = 50°C

The change in internal energy is equal and opposite for both flows, satisfying the first law of thermodynamics.

Second Law of Thermodynamics (Entropy):

The second law of thermodynamics states that in an isolated system, the total entropy of the system cannot decrease.

For an adiabatic process, the entropy change can be expressed as:

ΔS = nCp ln(T₂/T₁) + nCp ln(T₃/T₂)

Where:

ΔS is the change in entropy.

For the given process, let's calculate the entropy change:

ΔS = nCp ln(T₂/T₁) + nCp ln(T₃/T₂)

= nCp ln(70°C/20°C) + nCp ln((-30°C)/(70°C))

= nCp ln(3.5) + nCp ln(-0.42857)

The natural logarithm of a negative value is undefined, which means that ln(-0.42857) is not a valid calculation. Therefore, the entropy change cannot be determined for this process.

Since the entropy change cannot be determined or verified, it is not possible to conclude whether the given process satisfies the second law of thermodynamics.

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Answer:

In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy

Explanation:

Answer:

Hydrogen =4

Nitogen=4

Oxygen =12

Answer:

A. Diffusion

Explanation:

A.Diffusion  - this is correct. Diffusion is the process where small molecules enter the cell by moving from a high concentration to a low concentration through a semi-permeable membrane.

B.Exocytosis  - this is incorrect. Exocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo outside of the cell. The vesicles fuse to the cell membrane and deliver the cargo outside.

C.Osmosis  - this is incorrect, osmosis is a type of diffusion specific to water molecules

D.Endocytosis - this is incorrect. Endoocytosis is a cell transport mechanism where the cell uses a system of vesicles to transport cargo into the cell. The cell membrane engulfs the molecules and brings them into the cell via the vesicle

Answer:

See Explanaton

Explanation:

The law of multiple proportions states that when two same elements form more than a compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers.

Oxide A

3.50g of sulphur combined with 6.00g of oxygen

Oxygen:Sulphur = 6 : 3.5

Oxide B

2.80g of sulphur combined with 9.55g

Oxygen : Sulphur = 9.55 : 2.8

Therefore:

The ratio of Oxygen to Sulphur in Oxides A and B is:

\(\dfrac{\text{Oxygen}}{\text{Sulphur}} \implies \dfrac{6}{3.5}:\dfrac{9.55}{2.8} = \dfrac{1.7}{1}:\dfrac{3.4}{1}=1:2\)

Ratio of Oxygen=1:2

There is exactly twice in Oxide B as in Oxide A.

This result illustrates the law of multiple proportions.

The correct option is (e) none of these ,Valency is the ability of an element to combine.

Valency is the ability of an element to combine. Elements in the same group of the periodic table have the same valency. An element's valency is determined by how many electrons make up its outer shell.

A property of an element called "valency" defines how effectively it can meld with other elements. It is a way to count how many electrons are in an atom's outermost shell.

An atom's stability is determined by its valence electrons. Additionally, valence electrons are in charge of an atom's stability. The Octet Rule states that atoms often gain or lose electrons to reach the octet state, which is defined as having eight electrons in their valence shell. They stabilise at this stage.

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Answer:

The way its parts are arranged ....I think

Answer:

4. The question needs to focus more on a relationship instead of just numbers.

Explanation:

One of the characteristic of a good research questions that the answer to that question should be able to be used to make a certain decision. Without this, the question would be considered as useless.

The answer to the question "How many alligators live in the Everglades National Park?"  will not provide you with any useful information. Only non-useful fact. We need to make a little adjustment to make the answer becomes useful.

For example,  Let's say that we alter the question to;

"How littering contribute to the number of Alligators that live in the Everglades National Park?'

The answer to that question will provide us with something that we can use to make a decision. Let's say we find out that littering lead to decreasing number of alligators. We can use this data to convince the legislators to increase the budget to clean up the national park.

Explanation:

What is the best method for separating food dyes

Answer:

NO2

Explanation:

N = Nitrogen

O = Oxygen

Answer:

NO. 2.

is the answer

hopes this helps

Organic molecules can be defined as carbon-containing molecules found in living things.

They are chemical compounds that are mainly made up of carbon atoms.

Therefore, we can conclude that the organic molecules are those that come from living beings, that is, they are compounds of biological origin, which contain carbon.

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Scientists utilize their knowledge of previous occurrences to establish a general principle or explanation that may be used to forecast future events.

Step 1: Collect data. These observations must be objective rather than subjective. In other words, the findings should be verifiable by other scientists. Subjective observations based on human ideas and beliefs do not belong in the world of science.

Step 2: Create a hypothesis. Our observations provide information about the past or the present. We want to be able to forecast future occurrences as scientists. As a result, we must employ our reasoning abilities.

A hypothesis is a name given to the general principle. Inductive reasoning is the sort of reasoning involved (deriving a generalization from specific details).

A hypothesis should include the following features:

• It should be a universal concept applicable across space and time.

• It should be a working hypothesis.

• It should be consistent with existing observations.

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Answer: 2.07 M

Explanation:

(1.5m) (345ml)

---------------------

250 ML = 2.07M

Answer:

Explanation:

The balanced equation for the reaction between nitric acid (HNO3) and Zinc Hydroxide (Zn(OH)2) is:

2 HNO3 + Zn(OH)2 -------------> Zn(NO3)2 + 2 H2O

This reaction produces Zinc Nitrate (Zn(NO3)2) and water (H2O) as products. The coefficients in front of each element ensure that there are the same number of atoms of each element on both sides of the equation.

Equations known as rate law link the consumption of the reactants, an observable, to the kinetics of a reaction. The rate is influenced by the reactant concentrations, their thermodynamics, and the precise mechanism of the reaction.

The second-order rate constant kinact/KI (also known as the covalent efficiency constant) explains both the affinity of the initial reversible encounter complex and the maximum rate of covalent bond formation. In the context of enzyme-substrate kinetics, it is comparable to the enzyme specificity constant kcat/KM.

A rate law illustrates how a chemical reaction's rate is influenced by the reactant's concentration. The rate rule for a reaction like aA products typically has the form rate = k[A]n.

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Answer:

10 L

Explanation:

The equation of the reaction is;

2BaO2 = 2BaO + O2

Number of moles of  BaO2 = 114.7 g/169.33 g/mol = 0.677 moles

From the reaction equation;

2 moles of BaO2 yields 1 moles of O2

0.677 moles of BaO2 yields 0.677 * 1/2 = 0.3385 moles of oxygen

Hence;

PV=nRT

V = ?

P = 127400 Pa or 1.257 atm

T = 455 K

n = 0.3385 moles

R = 0.082 atmLmol-1K-1

V = nRT/P

V = 0.3385 * 0.082 * 455/1.257

V= 10 L

Answer:

In Explanation

Explanation:

Nonpolar molecules have London Dispersion forces as their only intermolecular force. London Dispersion forces are weak attractive forces that exist between all types of atoms and molecules, including nonpolar ones. These forces are caused by the temporary redistribution of electrons within the molecule, which creates temporary dipoles (uneven distribution of electrons) that can attract other nearby molecules. London Dispersion forces are relatively weak compared to other types of intermolecular forces, such as hydrogen bonding and dipole-dipole interactions, but they can still have a significant effect on the properties of nonpolar molecules, such as their boiling and melting points.

(Please give brainlist)

Answer: Dipole-Induced Dipole Forces

Fuerzas de dipolo inducidas por dipolo

Explanation:

These occur between a polar molecule and a nonpolar molecule, and thus must describe solutions. The polar molecule with a permanent dipole induces a dipole moment in the non-polar molecule. The more polarizable the nonpolar molecule, the easier it is to induce a dipole, and so the greater the interaction.

Espanol:

Estos ocurren entre una molécula polar y una molécula no polar y, por lo tanto, deben describir soluciones. La molécula polar con un dipolo permanente induce un momento dipolar en la molécula no polar. Cuanto más polarizable es la molécula no polar, más fácil es inducir un dipolo y, por lo tanto, mayor es la interacción.

Answer:

a difference in attitude

Explanation:

It's just not science. ... The big difference Popper identifies between science and pseudo-science is a difference in attitude. While a pseudo-science is set up to look for evidence that supports its claims, Popper says, a science is set up to challenge its claims and look for evidence that might prove it false.

The amino acids that will never yield the positive score in the substitution matrix is the glycine, proline and the cysteine.

The Evolutionary relationships in between the proteins that would be identified through the substitution reaction, which will scores the replacement for the one amino acid with the another amino acid. The large positive score for the substitution matrix will be indicates that the substitution that occurs frequently.

The Amino acids are the molecules which will combine to form the proteins. The Amino acids and the proteins are the building blocks for the life. The Amino acids are the organic compounds which will contain the both the amino and the carboxylic acid functional groups.

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The property of metal atoms that accounts for many of the observed bulk phenomena seen in metal samples is their metallic bonding. Metallic bonding involves the sharing of free-flowing valence electrons among positively charged metal ions. This strong bond creates a lattice structure, resulting in the unique characteristics commonly observed in metals, such as high electrical and thermal conductivity, malleability, ductility, and luster. These properties collectively contribute to the bulk phenomena seen in metal samples.

The unique property of metal atoms that account for many observed bulk phenomena in metal samples is their metallic bonding. Metallic bonding allows for the free movement of electrons between metal atoms, creating a sea of electrons that can flow throughout the metal structure. This property contributes to the high electrical conductivity and malleability of metals. Additionally, the close packing of metal atoms in a crystalline structure allows for efficient energy transfer, resulting in high thermal conductivity. Overall, the unique metallic bonding property of metal atoms plays a significant role in the many observed bulk phenomena seen in metal samples.
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