whats the melting point of water

Answer:

motion which is kenetic energy D

The molarity of NaCl in enough water is 0.582\(\frac{mol}{mL}\)

The moles of NaCl is given which is 0.23 and NaCl is dissolved in enough water which makes the solution of 395.6 mL.

The total number of moles of solute present in a given solution per litre is known as its molarity. In contrast to mass, which varies as the system's physical circumstances vary, the volume of a solution changes as a function of changes in the system's physical qualities, such as pressure and temperature. This has an impact on the molality of the solution. The symbol M, sometimes known as a molar, denotes molarity. A solution is considered to be one molar when one gram of the solute dissolves in one litre of the solution.

So, the molarity= \(\frac{totalnumber of moles}{total volume }\)

molarity=\(\frac{0.23}{0.395}\)

molarity=0.582\(\frac{mol}{mL}\)

Hence, the molarity is 0.582.

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To Find :

How many moles are in \(7.12 \times 10^{21}\) atoms of iron.

Given :

We know, 1 mole of any element or compound contains exactly \(N_A\) ( Avogadro's Number ) atoms/compound .

Now, \(N_A = 6.022 \times 10^{23}\)

So, number of moles in given number of atoms are :

\(n = \dfrac{6.022 \times 10^{23}}{7.12 \times 10^{21}}\\\\n = 1.18 \times 10^{-2} \ mol\)

Hence, this is the required solution.

Answer:

La Convención Marco de las Naciones Unidas sobre el Cambio Climático (CMNUCC) en su Artículo 1, lo define como ‘un cambio de clima atribuido directa o indirectamente a la actividad humana que altera la composición de la atmósfera mundial y que se suma a la variabilidad natural del clima observada durante períodos de tiempo comparables’. La CMNUCC distingue entre ‘cambio climático’ atribuido a actividades humanas que alteran la composición atmosférica y ‘variabilidad climática’ atribuida a causas naturales.

Los científicos han encontrado evidencias de que el clima en el planeta está cambiando a un ritmo más acelerado de lo esperado y que nuestras actividades ligadas a la producción, extracción, asentamiento y consumo, son la principal causa de este aceleramiento en el cambio.

El mayor problema de un cambio acelerado en el clima es que nuestras sociedades no están preparadas para asumir los cambios que esto nos pueda traer: derretimiento de las masas glaciares y nevados que abastecen acueductos, cambios en los ciclos de floración y fructificación de las plantas de cultivo, ascensos en el nivel de los mares donde hay mucha población viviendo, mayor ocurrencia y fuerza en lluvias, sequías, huracanes, heladas y granizadas en áreas urbanas y rurales, entre otros fenómenos que sin duda reducen nuestra calidad de vida.

Explanation:

espero te áyude

Answer:

1. 104000m

2. 160mm

3. 5600000 mg

Answer:

Symbol: a one or two letter symbol that represents the element.

Explanation:

Atomic Number: the number of protons in the nucleus (which is the same as the number of electrons in the atom).

The number of protons in the nucleus of an atom in the periodic table is known as the atomic number.

The known elements are arranged in the periodic table according to their increasing atomic number and recurrent chemical properties. They are arranged in a tabular format with rows denoting periods and columns denoting groups.

According to their ascending atomic numbers, elements are arranged from left to right and top to bottom. As a result, elements belonging to the same group will have similar chemical properties and the same valence electron configuration.

While valence electrons will be arranged in increasing order for elements in the same period. Consequently, there are more energy sub-levels per energy level as the atom's energy level rises.

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Answer:

Experiments with gases that first became possible at the turn of the nineteenth century led John Dalton in 1803 to propose a modern theory of the atom based on the following assumptions. 1. Matter is made up of atoms that are indivisible and indestructible.

The percent composition of ZnO is approximately 80.50% Zn and 19.50% O.

To calculate the percent composition of a compound, we need to determine the mass of each element present in the compound and express it as a percentage of the total mass of the compound.

Given;

Mass of Zn = 1.63 g

Mass of oxygen (O₂) = 0.40 g

Balanced chemical equation for the reaction between Zn and oxygen to form ZnO is;

2Zn + O₂ → 2ZnO

From the balanced equation, we can see that 2 moles of Zn react with 1 mole of O₂  to produce 2 moles of ZnO.

1 mole of Zn has a molar mass of 65.38 g/mol, and 1 mole of O₂  has a molar mass of 32.00 g/mol.

Now we can calculate the moles of Zn and O₂  in the given masses:

Moles of Zn = Mass of Zn / Molar mass of Zn

Moles of Zn = 1.63 g / 65.38 g/mol ≈ 0.025 mol

Moles of O₂  = Mass of O₂  / Molar mass of O₂

Moles of O₂  = 0.40 g / 32.00 g/mol ≈ 0.0125 mol

The molar mass of ZnO is the sum of the molar masses of Zn and O, which are 65.38 g/mol and 16.00 g/mol, respectively;

Molar mass of ZnO = 65.38 g/mol + 16.00 g/mol = 81.38 g/mol

Now we can calculate the percent composition of ZnO;

Mass of Zn in ZnO = Moles of ZnO × Molar mass of Zn

Mass of Zn in ZnO = 0.0125 mol × 65.38 g/mol ≈ 0.81725 g

Mass of O in ZnO = Moles of ZnO × Molar mass of O

Mass of O in ZnO = 0.0125 mol × 16.00 g/mol ≈ 0.200 g

Total mass of ZnO = Mass of Zn in ZnO + Mass of O in ZnO

Total mass of ZnO = 0.81725 g + 0.200 g = 1.01725 g

Now we can calculate the percent composition of ZnO;

Percent composition of Zn in ZnO = (Mass of Zn in ZnO / Total mass of ZnO) × 100%

Percent composition of Zn in ZnO = (0.81725 g / 1.01725 g) × 100%

≈ 80.50%

Percent composition of O in ZnO = (Mass of O in ZnO / Total mass of ZnO) × 100%

Percent composition of O in ZnO = (0.200 g / 1.01725 g) × 100%

≈ 19.50%

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Answer:

21.25

Explanation:

We can calculate the percent yield using the formula: (actual yield / theoretical yield) × 100. In this case, the percent yield is (22 g / 88 g) × 100 = 25%.

We need to use the balanced chemical equation for the reaction involving C2H60 and CO2. From this equation, we can determine the theoretical yield of CO2 that should have been produced if all of the C2H60 was consumed. Then, we can use the actual yield of CO2 that was isolated to calculate the percent yield. The balanced chemical equation for the reaction is: C2H60 + 3O2 -> 2CO2 + 3H2O
From this equation, we can see that for every 1 mole of C2H60 consumed, 2 moles of CO2 should be produced. Therefore, the theoretical yield of CO2 is:
1 mole C2H60 x (2 moles CO2 / 1 mole C2H60) x (44.01 g CO2 / 1 mole CO2) = 88.02 g CO2
Now we can calculate the percent yield:
percent yield = (actual yield / theoretical yield) x 100%
actual yield = 22 g CO2
percent yield = (22 g CO2 / 88.02 g CO2) x 100% = 25%

The percent yield of the experiment is 25%. This means that only 25% of the expected amount of CO2 was actually produced. There could be various reasons for this, such as incomplete reaction or loss of product during isolation.
To calculate the percent yield, we first need to determine the theoretical yield of carbon dioxide and then compare it to the actual yield (22 g). The balanced equation for the combustion of C2H6O (ethanol) is: C2H6O + 3O2 -> 2CO2 + 3H2O. From this equation, we can see that 1 mole of ethanol produces 2 moles of carbon dioxide. The molar mass of CO2 is 44 g/mol, so the theoretical yield is 2 moles × 44 g/mol = 88 g.

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The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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Based on the information given, the mole should be considered a base unit in the SI system because it serves as a universally accepted measure of the amount or quantity of substances.

The mole of a substance is the amount of a substance that contains as many elementary particles as there are in 12 g of carbon-12.

12 g of carbon-12 contains the Avogadro number of particles which equals 6.02 * 10²³ particles.

Hence, a mole of a substance is the amount of that substance that contains  6.02 * 10²³ elementary particles of that substance.

SI units refer to units of measurement that are universally accepted for measuring the properties of quantities of objects.

Some SI unit values include:

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Yes, a change in the molality causes the boiling point of a solution to increase. Molality refers to the number of moles of solute present in a kilogram of solvent. It's important to note that when solute particles are added to a solvent, the solution's boiling point increases and the freezing point decreases.

There is a direct relationship between the molality of a solution and its boiling point. When a solute is dissolved in a solvent, the solution's boiling point increases. The solute particles have a greater influence on the solution's properties than the solvent particles, which results in an increase in the solution's boiling point.

The boiling point of a solution is greater than that of the pure solvent due to the presence of a solute. As a result, the boiling point of a solution can be used to determine the solute's molecular weight. The difference between the boiling points of a pure solvent and a solution of the same solvent and solute is proportional to the solute's molality.

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Among the given options, the functional group that cannot hydrogen bond with itself is: 1) Ethers Ethers, which have the general formula R-O-R', consist of two alkyl or aryl groups bonded to an oxygen atom.

While oxygen is capable of forming hydrogen bonds with hydrogen atoms from other functional groups, ethers themselves do not have hydrogen atoms directly bonded to the oxygen atom. As a result, ethers lack the necessary hydrogen bonding donor or acceptor sites required for intermolecular hydrogen bonding.

2) Tertiary amines: Although they lack a hydrogen atom directly bonded to the nitrogen atom, they can still participate in hydrogen bonding as hydrogen bond acceptors.

3) Esters: The oxygen atom in the ester functional group can act as both a hydrogen bond donor and acceptor, enabling intermolecular hydrogen bonding.

4) Carboxylic acids: Carboxylic acids have a hydrogen atom bonded to the oxygen of the carboxyl group, making them capable of forming hydrogen bonds with other carboxylic acid molecules through the oxygen and hydrogen atoms.

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Answer:

\(distance = speed \: \times time\)

D = S × T

Explanation:

\(distance = 3.5 \times 5 \\ = 17.5 \: m\)

Reaction

SiCl₄+ 2Mg ⇒ Si + 2MgCl₂

to find limiting reagents: divide the number of moles by their coefficients

SiCl₄ = 1 mole : 1 (coefficient) = 1

Mg = 5 mole : 2 (coefficient) = 2.5

SiCl₄ as a limiting reactant (smaller), and Mg as an excess

then all the compounds involved in the reaction are based on moles of SiCl₄

Si produced =

\(\tt \dfrac{coefficient~Si}{coefficient~SiCl_4}\times mole~Si=\dfrac{1}{1}\times 1=1\)

Reacted Mg (excess) = 2/1 x 1 = 2 mole

mole Mg remaining = 5 - 2 = 3 mole

The standard free-energy change (∆G^o) for the conversion of pyruvate to lactate is 35.718 kJ/mol.

To calculate the standard free-energy change (\(G^o\)) for the conversion of pyruvate to lactate using the given equation follow the given steps::

\(Pyruvate + NADH + H \textsuperscript{+} < = > lactate + NAD \textsuperscript{+}\)

Using the equation Δ\(G^o = -nFE^o\), where F = 96485 J/V*mol e-, and E^o = -0.185 V.

Step 1: Determine the number of electrons transferred (n). In this reaction, 2 electrons are transferred from NADH to pyruvate to form lactate and \(NAD\textsuperscript{+}\).

Step 2: Use the provided equation and values to calculate  Δ\(G^o\):

\(\Delta G^o = -nFE^o\\\Delta G^o = -(2)(96485 J/V*mol e-)(-0.185 V)\)

Step 3: Calculate the value and convert it to kJ:
\(\Delta G^o = 35718 J/mol\\\Delta G^o = 35.718 kJ/mol\)  (rounded to three decimal places)

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Answer:

tabla periodica 6

Explanation:

.....

Answer:

See the answer below

Explanation:

P can displace Q from its salt solution means that P is more reactive than Q.

Q cannot displace R from its salt solutions means that R is more reactive than Q.

a) There is no information as to which of P and R has the capacity to displace one another from their salt solutions. Hence, the most reactive metal can be either of P and R.

b) When P displaces Cu from CuSO4 solution, the equation can be represented below (assuming that P is monoatomic):

\(P + CuSO_4 --> P_2SO_4 + Cu\)

Hence, the product formed is \(P_2SO_4\)

The unknown compounds are among a restricted set of substances that are provided for you in ascending mp and bp order. Applying your experimental results to these lists will help you narrow down the list of potential chemicals.

Compounds can be recognized by two tests, including

1. Physical assessment

2. Chemical assessment

Physical assessment

This is dependent on outward manifestations and qualities including State, Color, Texture, Smell (odor), Taste, and Feel.

Physical characteristics such as solubility, crystalline or amorphous nature Refractive index, melting point, and boiling point

pH, conductivity, functional groups, and other chemical assessment criteria. utilizing analytical approaches such as spectroscopy analysis and chromatography analysis.

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Answer:

it'll produce carbondioxide bubbles

Answer:

it would prevent the milk from curdling

Explanation:

baking soda is regularly added to milk, believe it or not

Answer:

The law of conservation of mass states that the quantity of the mass can neither be added to, neither can it be removed. The greater picture's mass will always be the same amount.

Answer: Hope This Helps

Explanation:

1:  The nephrons contain a filter called the glomerulus. The fluid that is filtered  from the blood then travels down through a tubule. The tubule adjusts the level of wastes that will leave the body in the urine.

(I dont know the second part so hope this half answer helps a little bit. Sorry.)

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✍ 1. ➺ Nephrons have filters known as glomerulus (they are a cluster of very thin-walled blood capillaries). Glomerulus filters our blood & then removes any unwanted waste materials. Now, this filtrate which is removed out from the blood gets collected & filtered again in the Bowman's Capsule & tubules from where nephrons remove glucose, amino acids & a major amount of water. The urine forming in each kidney now enters a long tube (ureter) where urine passes & gets stored in the urinary bladder. Urine gets passed out of the body through the urethra.

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✐ 2. i) Property of metals ⎆ Good conduction of heat.

ii) Property of metals ⎆ Good conduction of electricity & ductility.

iii) Property of metals ⎆ Malleability & ductility.

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When 5 grams of CO and 5grams of O₂ is combined according to the reaction 2CO + O₂ ----------> 2CO₂ then Limiting reagent is CO.

Limiting reagent is the reactant that get used up in the reaction first.

According to the given reaction:

2CO + O₂ ----------> 2CO₂

5g       5g

∴ Molar mass of CO = Molar mass of C + Molar mass of O

⇒ Molar mass of CO = 14 + 16

⇒ Molar mass of CO = 28g

∴ Molar mass of O₂ = 16(2) = 32g

∴ Molar mass of CO₂ = Molar mass of C + 2(Molar mass of O)

⇒ Molar mass of CO₂ = 14 + 2(16)

⇒Molar mass of CO₂ =44g

Let's find out the moles of CO and O₂

∴ Moles = Given mass / Molar mass

⇒ moles of CO = 5/28 = 0.17

⇒ moles of O₂ = 5/32 = 0.15

For finding out the Limiting Reagent, we will divide the number of moles with the stiochiometry of the given reaction.

⇒ For CO = Moles/ stiochiometry = 0.17/2 = 0.085

⇒ For O₂ = Moles/ stiochiometry = 0.15/1 = 0.15

Since, the ratio of number of moles with the stiochiometry is less for CO hence it is the Limiting reagent, i.e. it will get used up in the reaction first.

Hence, the Limiting reagent  for the reaction is CO.

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The electrochemistry underlying the electrical current in a neuron as it is stimulated involves sodium channels opening to allow sodium to enter the cell.
2. The most fundamental variable that can likely explain the evolution of bigger brains is the overall ecological complexity that the animal deals with.

During neuron stimulation, an action potential is generated. This process involves the depolarization of the neuron's membrane, which is achieved by the influx of positively charged ions, primarily sodium ions (Na+). When a neuron is stimulated, voltage-gated sodium channels in the cell membrane open, allowing sodium ions to rapidly enter the cell. This influx of positive charge depolarizes the membrane, creating an electrical current that propagates along the neuron.

Regarding the second question, the most fundamental variable that can likely explain the evolution of bigger brains is the overall ecological complexity that the animal deals with. Animals that inhabit complex and challenging environments often require enhanced cognitive abilities to navigate and respond to their surroundings effectively. The ecological complexity, such as varied food sources, social interactions, and environmental stimuli, can drive the evolutionary pressure for larger brain size and increased cognitive capacity. While factors like diet, sociality, and mating strategies may play a role, the overall ecological complexity is considered a crucial determinant of brain evolution.


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Answer:

I'm not sure who made this app but someone made it so that people who understand certain topics can help others who are confused about it.

Answer:

D. Density is defined as mass/volume.