4. Calculate the number of grams in 1.22 moles of sodium

Answer:

im pretty sure its B

Explanation:

The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.

The reaction is given as :

HCl  +  NaOH  ----->    H₂O   +   NaCl

moles of HCl = 5.42 × 0.025

                      = 0.135 mol

moles of NaOH = 4.32 × 0.025

                          = 0.108 mol

moles of reaction = 0.108 mol

specific heat capacity is given as:

Q = mc ΔT

Q = 0.108 × (- 55.8) = - 6.026 kJ = 602.6 J

total volume = 25 ml + 25 ml = 50 ml

mass = density × volume

         = 1.04 × 50 = 52 g

now, Q = mc ΔT

          602.6  = 52 × 3.93 × ( T - 25)

The final temperature T = 28 °C

Thus, The final temperature (in °C) when 25.0 mL of 5.42 M HCl are mixed with 25.0 mL of 4.32 M NaOH, if each solution starts at 25.0 °C is 28 °C.

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Answer:

A. 40.0%

Explanation: Divide 8/20=0.4 Move the decimal twice to the right BAM! you got 40%.

The mole ratio of acid to base when neutralizing hydrochloric acid with sodium hydroxide is 1:1. A mole of NaOH would completely neutralize one mole of HCl.

A solution can be neutralized by combining an acid and a base. When the moles of the acid and the moles of the base are equal, neutralization takes place. The balanced chemical reaction can be used to calculate the molar ratio of acid to base. The molar ratio is represented by the reaction coefficient. The base's moles and molar mass can then be used to calculate its moles.

If, however, chlorine dioxide, if barium hydroxide were added, the mole ratio would be 2:1.

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Single- replacement reaction is described by the chemical equation Mg(s)+Cu(NO₃)₂(l)→Mg(NO₃)₂(s)+Cu(s) as more reactive magnesium displaces copper from it's salt as it is less reactive.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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The following internal parts of the flower:-

Stigma - the head of the pistil. The stigma receives pollen, with a view to start the process of fertilization.

Style - this is the name for the stalk of the pistil.

Ovary - the bottom of the pistil.

Ovules - these are the flower's eggs, located inside the ovary.

Anther- carries pollen sacs, wherein pollen grains are shaped. Pollen consists of the male cells.

In female parts of the flower is pistil = Stigma + Style + Ovary

In male parts of the flower is stamen = anther + filament

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Chemical formula of element X is in group 3, element Y is in group 7A or 17 is XY₃(option-b). Since the electrovalence of X is 3 and Y is 1.

A chemical formula lists the constituent elements of a compound along with how many atoms of each are present in the compound's smallest unit, whether it be a molecule or a formula unit. We can name simple compounds based on their chemical formulas by using the names of the elements and a few simple rules.

A compound's chemical formula is a symbol that represents the compound's chemical make-up. We can determine a compound's number and type of atoms from the chemical formula by looking at the elements that make up the compound.

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Mole is base unit of substance. The number of particles in one mole is equal to 6.022 × 10²³. The number of particle in a mole is called as Avogadro's number.

The mole of substance is the amount of substance that contain elementary particles as the number of atoms. the symbol of mole is mol. it is the SI unit of amount of substance. The number particles are ion one mole of substances is 6.022 × 10²³. The number of particles in one mole of substance is called as Avogadro's number.

Thus, Mole is base unit of substance. The number of particles in one mole is equal to 6.022 × 10²³. The number of particle in a mole is called as Avogadro's number.

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Answer:

20

Explanation:

Because mass number is equal to Atomic number.

Empirical formula is the simplest whole number ration of elements in a compound. Molecular formula is n times the empirical formula, where n is integers 1,2,... The empirical formula is CH[tex]_2[/tex]O.

Empirical formula gives the proportion of the element that is present in a compound. It does not give information about the actual number or the arrangements of the atoms.

Number of gram atoms in compound and divide by smallest Number of gram atoms in compound

C=(38.7%)÷12=3.2

H=(9.6%)÷1=9.6

O=( 51.6%)÷16=3.2

The atomic ratio is 3.2:9.6:3.2

Whole number C:H:O is1:2:1

Empirical formula corresponding to this whole number is CH[tex]_2[/tex]O.

Thus the empirical formula is CH[tex]_2[/tex]O.

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Pressure of the gas inside the container is 662.59 torr.

The ideal gas law (PV = nRT) connects the macroscopic characteristics of ideal gases. An ideal gas is one in which the particles are both non-repellent and non-attractive to one another (have no volume).

The general law of ideal gas can be applied here: PV is equal to nRT, where P is the gas pressure in atm.

V is the number of moles of the gas in a mole, and n is the volume of the gas in L. R is the universal gas constant. T is the temperature(Kelvin) of the gas.

If P and T are different values and n and V are constants, then

(P₁T₂) = (P₂T₁).

P₁ = 735 torr, T₁ = 29°C + 273 = 302 K,

P₂ = ??? torr, ​T₂ = 62°C + 273 = 335 K.

∴ P₂ = (P₁T₂)/(P₁) = (735 torr)(302 K)/(335 K) = 662.59 torr.

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Answer:

Hydrogen Electronegativity Level: 2.20 is the correct answer

The specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.

Transcriptional repressor is defined as a sequence-specific DNA binding proteins work by enticing corepressor complexes, which are made up of a variety of proteins, including histone modifying enzymes.  It binds the DNA and repel RNA polymerase.

In the absence of its ligand, the specificity of the transcriptional repressor for its target site over non-target sites is relatively low. In the presence of the ligand, the specificity is quite high because ligand is used as a binding agent and if binding agent is not present the molecule does not bind easily.

Thus, the specificity of the transcriptional repressor for its target site over non-target sites in the absence of its ligand is very low. The specificity in the presence of the ligand is very high.

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Hypochlorous acid is a weak acid. Its equation is following:-

HClO ⇄ H⁺ + ClO⁻

K = [H⁺]  [ClO⁻] / [HClO]

Weak Acids are the acids that do not completely dissociate into their constituent ions when dissolved in solutions.

When dissolved in water, an equilibrium is established between the concentration of the weak acid and its constituent ions.

The awareness of a substance is the quantity of solute present in a given amount of answer. Concentrations are typically expressed in phrases of molarity, defined as the wide variety of moles of solute in 1 L of answer.

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The amount of the salts left undissolved at 40 °C is Lead II nitrate = 300 g and Potassium chloride = 100 g and Potassium dichromate = 0 g.

We are aware that the mass of a solute that may dissolve at a specific temperature is related to the solubility. The absorption is temperature dependant, it must be said.

Let's consider how much of each salt would absorb at 40 °C;

Pb(NO3)₂ : 0.0g

KCl : 100.0g

K₂Cr₂O₇ : 300.0g

For any salt, we may calculate the amount that can be dissolved at 40 °C by dissolving 500 g and subtracting its solubility at that temperature.

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The complete question is-

For each salt, determine how much will remain undissolved if 500 g is mixed into a liter of pure water at 40 °C. One significant figure is sufficient in each answer.

Pb(NO3)₂:

KCI:

K₂Cr₂O7:

If 9.8 g of sulfuric acid is dissolved in an excess quantity of water, it will yield 0.2-mole moles of hydrogen ions ( H+) and 0.1 moles mole of sulfate ions (SO4 -2).

Sulfuric acid or sulphuric acid, known in antiquity as oil of vitriol, is a mineral acid composed of the factors sulfur, oxygen, and hydrogen, with the molecular system H₂SO₄. it's miles a drab, odorless and viscous liquid that is miscible with water.

Calculation:-

The molar mass of sulphuric acid = 98

mass = 9.8 gram

moles = mass/ molar mass

           = 9.8/98

            = 0.1 moles

moles of H+ = 2 × 0.2 = 0.2 mole

moles of sulfate ions (SO4 -2). = 0.1 moles.

Sulfuric acid is used in many industries. it's used to supply other chemical compounds, explosives, and glue; to refine petroleum; to remedy metal, and in lead-primarily based vehicle batteries.

Sulfuric acid reacts violently with alcohol and water to launch warmth. It reacts with most metals, mainly while diluted with water, to shape flammable hydrogen gasoline, which may additionally create an explosion danger.

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Sunscreen look like if it absorbed all of the visible light that hits it look like skin bright

A substances that help protect the skin from the sun harmful rays and sunscreen reflect and absorbed and scatter both ultraviolet radiation and provide protection against both type of radiation and sunscreen contain ingredient that help absorbed UV light and they sit on the surfaces of the skin and reflect away from the skin and sunscreen ingredient form a thin protective film that penetrate from the skin

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Answer:

D.

Explanation:

The number of charges on an ion which is formed by a metal is equal to the group A number of the metal in the periodic table and the number of charges on an ion which is formed by a non-metal in the periodic table is equal to the group number minus eight.

In the periodic table there are a total of 18 groups. The group A which are divided as IA, IIA, IIIA, IVA, VA, VIA, VIIA and VIIIA.

The group IA is known as alkali metal in the periodic table. The group IIA is known as alkaline earth metal in the periodic table. The group IIIA is known as boron family in the periodic table. The group IVA is called transition elements in the periodic table. The group VA is known as pnictogens in the periodic table. The group VIA is known as chalcogens in the periodic table. The group VIIA is known as Halogen family in the periodic table. The group VIIIA is called Noble gas ot inert gas elements in the periodic table.

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Explanation:

Carbon-14 has a half life of 5730 years, meaning that 5730 years after an organism dies, half of its carbon-14 atoms have decayed to nitrogen atoms. Similarly, 11460 years after an organism dies, only one quarter of its original carbon-14 atoms are still around.

Answer:

Cells

Explanation:

Everything in living things is made from cells. Cells come together to make tissues, which make organs, which make organ system.

The ability of an atom to pull shared electrons is known as electronegativity.

Electronegativity is the property of an atom that allows it to attract the shared electrons from a covalent bond to itself. The shared electrons will be uniformly distributed if the electronegativity of the connected atoms is the same.

On the periodic table, electronegativity usually increases from left to right throughout a period and decreases as you move down a group. The most electronegative elements are thus found in the top right corner of the periodic table, whereas the least electronegative ones are found in the bottom left.

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Answer:

The uranium fluoresces under UV light

Explanation:

The uranium fluoresces under UV light because the UV excites the electrons above the ground state and gives off photons as the electrons transition back to the ground state,” Naomi Marks, a research scientist at the Lawrence Livermore National Laboratory in California, tells Collectors Weekly.

Answer:

Uranium oxide.

Explanation:

Uranium glass does indeed glow under a blacklight. This is because of the uranium oxide that is used to produce the glass. When exposed to ultraviolet light, the uranium oxide will emit a greenish-yellow light.

When cyclic ester is reacted with ethyl alcohol in presence of heat and acidic medium, ethyl hexanoate is formed. The structure of ethyl hexanoate is attached in image.

Lactones are the name for cyclic esters. The COOH and OH groups that unite to generate water in these instances are a component of the same molecule.

German chemist Leopold Gmelin likely abbreviated the word "ester" from the German Essigäther, "acetic ether," when he first used it in 1848.

First, carbonyl oxygen abstracts a proton. The production of an ester on one side of the chain and alcohol on the other follow the attack of the ethyl molecule on the carbonyl carbon.

Thus, ethyl hexanoate is formed as a product.

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The pH of the solution after the addition of 100. 0 ml of HNO3. The kb of NH3 is 1. 8 × 10-5. So, pH is 10.9 basic .

This neutralization occurs as the acid is added to the base:

NH3(aq)+ HNO3(aq)= NH4NO3(aq)+ H2O(l)

The initial moles of NH3present is given by,

nNH3= c×v= 0.10× 100/1000= 0.01m

The number of moles of

HNO3 added is given by:

nHNO3= c×v= 0.10× 100/1000= 0.001

It is clear from the equation that the acid and base react in a 1:1 molar ratio. So, the no. moles of NH3remaining will be 0.01 - 0.001= 0.009

The total volume is now

100.0+100.0= 200.0x cm3

The concentration of NH3 is given by,

[NH3]= c/v= 0.001/200/1000= 0.05x mol/l .

pOH= 12 (pKb− logb)

where b is the base's concentration.

Given that there is little dissociation, we can roughly compare this to the starting concentration.

pKb= −logKb= −log(1.8×10−5)= 4.744

pOH= 3.056

At 25∘xC, we know that, pH+ pOH=14

pH= 14− 3.056= 10.9

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Answer:

D

Explanation:

I'm not 100% sure on this but I am pretty confident that it's D or C I'm 98% sure it's D

The value of q (kJ) in the exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure is 14.40kJ.

What is an exothermic reaction?

Exothermic reaction is the reaction in which the standard enthalpy change of the reaction is negative that is there is release of heat energy.

The q (kJ) in the exothermic reaction can be calculated as,

2 H2O2(l) ------> 2 H2O(l) + O2(g)         ΔH = -196 kJ

So, 196kJ of heat (q) will be released for every 2 moles of hydrogen peroxide. To calculate the heat released for 5.00 g of hydrogen peroxide,

Number of moles of hydrogen peroxide = 5.00g / 34.016 g/mol

n = 0.147

q = -196 x 0.147 / 2 = 14.40kJ.

Therefore, 14.40kJ of heat is released by 5.00 g of hydroxide peroxide when it decomposes in the exothermic reaction.

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The change in boiling point of C6H14 in benzene is 2.257 degree Celsius.

What is boiling point?

The boiling point is the temperature at which vapor pressure of the liquid is equal to the atmospheric pressure or the temperature at which the liquid phase turns into vapor state.  The boiling point of pure water at sea level is 100 degree Celsius.

The change in boiling point can be calculated as,

ΔTb = Kb x m

where ΔTb is change in boiling point, Kb is Ebullioscopic constant and m is molality of the solute.

ΔTb = (2.65 degree Celsius / m) x 0.852m = 2.257 degree Celsius.

Therefore, the change in the boiling point of 0.852m solution of C6H14 in benzene is 2.257 degree Celsius.

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Answer:

The correct answer for ACELLUS is 2.25

Explanation:

The energy that is released by 1Kg of octane is 47872 kJ while the heat that is enthalpy of formation of the mercury oxide is -181.6 kJ mol–1.

We know that the enthalpy of combustion has to do with the heat that is evolved when we burn one mole of a substances in oxygen. We need to first obtain the number of moles of the octane as follows;

Number of moles = mass/molar mass = 1 * 10^3 g/114 g/mol = 8.8 moles

If 1 mole of octane produces 5440 kJ of heat

8.8 moles of octane would produce 8.8 moles *  5440 kJ/1 mole

= 47872 kJ

b) Given that the heat that the energy that is required to decompose the compound is 181.6 kJ mol–1 then the enthalpy that is required to form the compound is -181.6 kJ mol–1.

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Given that we have a mass percentage. Since it is convenient to start with 100g of the chemical, there are 60g of sulfur and 40g of oxygen in a 100g sample of the above compound.

The reactants consist of four hydrogen atoms, four oxygen atoms, and one carbon atom. The end products contain four hydrogen atoms, four oxygen atoms, and one carbon atom. This calculation is correct. The two elements carbon and hydrogen make up the simplest organic molecules. These substances are known as hydrocarbons. A gas mixture with two parts oxygen and four parts hydrogen was the most explosive. There was nothing left over after burning this gas mixture. It was the most explosive response because it was the most effective.

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