Explain how the information given below could be used to determine the concentration of an unknown sample.
Concentration (M)
0.20
0.3
0.40
0.50
Absorbances
0.27
0.41
0.55
0.69

Answer:

= 1.553 x 10²³ ions

Explanation:

One mole of a compound or a substance consists of 6.02 x 10²³ ions. 6.02 x 10²³ is also referred to as Avogadro's number/constant.

From the above question, we have been asked to determine the number of ions in 16g of H₂CO3.

The relative formula mass (RFM) of H₂CO3 is 62.026 u:

Derived as;

H₂CO3 = (2 x 1.008) + (12.01 x 1) + (3 x 16.00) u

= 62.026 u.

Number of moles = Mass/RFM

[tex]moles \: = \frac{16}{62.026} \\ = 0.2579563 \\ = 0.2580 \: moles[/tex]

1 mole = 6.02 x 10²³ ions

0.2580 moles = ?

=

[tex] = \frac{0.2580 \times 6.02 \times 10 ^{23} }{1} \\ = 1.553 \times {10}^{23} \: ions[/tex]

Hence the number of ions in 16g H2CO3 = 1.553 x 10²³

The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is known as D)ores.

Ore is natural rock or sediment that consists of one or more valuable minerals, commonly containing metals, that can be mined, handled, and offered at a profit. Ore is extracted from the earth thru mining and treated or subtle, often via smelting, to extract the precious metals or minerals.

Ore is a deposit in Earth's crust of one or greater valuable minerals. The maximum valuable ore deposits include metals crucial to industry and alternate, like copper, gold, and iron. Copper ore is mined for ramification of industrial uses.

Ores are minerals that have a high awareness of a sure detail, commonly metallic. Examples are cinnabar (HgS), an ore of mercury, sphalerite (ZnS), an ore of zinc, cassiterite (SnO2), and an ore of tin (Mineral).

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The salt produced by the neutralization of 2CsOH(aq) and H₂SO₄(aq) is Cesium Sulphate - Cs₂SO₄.

The given compounds are

2CsOH - a strong base and H₂SO₄ - a strong acid

When they react with one another, the neutralization takes place and forms a neutral compound Cs₂SO₄ called as a salt.

The reaction is as follows:

2CsOH(aq) + H₂SO₄ → Cs₂SO₄ + H₂O

Therefore, the salt produced will be Cs₂SO₄(Cesium sulphate).

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Elements 3 to 10 (Li to Ne) show a more or less steady increase in ionization energy.

The amount of energy required to remove an electron from an isolated atom or molecule.

The major difference is the increasing number of protons in the nucleus as you go from lithium to neon. That causes greater attraction between the nucleus and the electrons and so increases the ionization energies. In fact the increasing nuclear charge also drags the outer electrons in closer to the nucleus.

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The formula of water is H2O

Explanation:

The water molecule consists of two hydrogen atoms and one oxygen atom. So the chemical molecula formula of water is H2O where H is the symbol of hydrogen and O is the symbol of oxygen and 2 indicates that there are two atoms of hydrogen.

Hope this helps you!

The charge on calcium in CaO is 2.

A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.

It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.

Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.

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The empirical formula of the compound is CHCl₃.

Given,

Mass of carbon = 5.03 g

Mass of hydrogen = 0.42 g

Mass of chlorine = 44.5 g

Molecular weight of carbon = 12 g

Molecular weight of hydrogen = 1 g

Molecular weight of chlorine = 35.4 g

First, calculate the moles of each element,

                      Moles = given mass/ molecular weight

Moles of carbon = 5.03/12 = 0.42

Moles of hydrogen = 0.42/1 = 0.42

Moles of chlorine = 44.5/ 35.4 = 1.26

Divide the moles of each element by the smallest number of moles,

0.42 mol of C/ 0.42 = 1 C

0.42 mol of H/ 0.42 = 1 H

1.26 mol of Cl/0.42 = 3 Cl

The ratio of elements is 1:1:3

Therefore the empirical formula of the compound will be CHCl₃.

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Answer:CHCl₃

Explanation:

From the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains (option D).

The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.

Thus, from the absorption spectra of a gas, we can see the  amount of thermal energy the gas contains.

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The chemical equation for photosynthesis is 6CO2+6H2O→C6H12O6+6O2. 6CO2+6H2O→C6H12O6+6O2.

In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts.

Photosynthesis is the technique with the aid of which inexperienced plant life and positive other organisms remodel light electricity into chemical strength.

During photosynthesis in green flowers, mild strength is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-wealthy organic compounds.

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Answer:

The answer is actually:

D

Explanation:

The ways to identify the components necessary for a combustion reaction include:

This is referred to as burning and involves high-temperature exothermic redox chemical reaction.

This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.

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The most momentum is D. A 65 kg person with a velocity of 2.5 m/s north.

Momentum can be defined as "mass in motion." All items have mass; so if an object is moving, then it has momentum - it has its mass in movement. The amount of momentum that an item has depends upon two variables: how a lot of stuff is moving and how fast the stuff is moving.

Momentum is the force that exists in a shifting object. The momentum pressure of a moving item is calculated by way of multiplying its mass (weight) via its velocity (pace). Surely put, a 20-lb. rock going at 10 mph has lots more momentum force than a 3-lb. Ball going at the same speed.

Momentum is the pressure that exists in a transferring item. The momentum pressure of a shifting object is calculated with the aid of multiplying its mass (weight) by way of its velocity (velocity). Simply put, a 20-lb. Rock going at 10 mph has lots more momentum pressure than a three-lb. Ball going at equal speed. They're each associated with an item's pace (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic power is a measure of an item's energy from movement and is a scalar.

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The equilibrium concentration of ethyl acetate will be 5.39 M.

Initially, 8.59 M acetic acid react with 8.59 M ethanol.

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

     (8.59)           (8.59)                      (0)

after some time, some change will happen.

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

  (8.59-x)         (8.59-x)                   (x)

At equilibrium condition,

acetic acid  +  ethanol  ===>  ethyl acetate  +  water

     (3.20)           (3.20)                      (x)

At equilibrium, for acetic acid and ethanol to go from 8.59 to 3.20, the value of x must be 5.39.

Therefore, the equilibrium concentration of ethyl acetate will be 5.39 M.

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Answer:

an acid +metal =salt +hydrogen

Explanation:

HCL+Mg =Mgcl2+H2

(because Mg has an ion with a +2 charge ,it attracts Cl with a -2 charge )

therefore the correct answer is D for the above reasons

Answer:

When magnesium reacts with hydrochloric acid (HCl), a single-replacement reaction occurs. These reactions involve the substitution of one element in a compound with another. In this case, the hydrogen in HCl will be swapped with the magnesium metal because both of these elements make cations (positively-charged ions) when they participate in ionic bonding.

So why does the chorine have a subscript of 2 when it bonds with magnesium? This occurs in order to balance the ionic charges and make the overall compound neutral.

Magnesium wants to give away 2 electrons when it ionizes, forming the cation Mg²⁺. However, chlorine only wants to gain 1 electron to fill its valence shell, making it form the anion, Cl⁻. As you can see, if just one of each ion were to bond, the compound would have an overall charge of +1 because (+2 - 1 = +1). Therefore, the compound can be made neutral if two chlorine ions bond with just 1 magnesium ion (+2 - 1 - 1 = 0).

The hydrogen ion from HCl becomes H₂ after the reaction occurs. This occurs because hydrogen generally exists as a diatomic compound in nature (diatomic = exists as 2 atoms).

The complete balanced equation for the reaction is:

Mg + 2 HCl  ------> MgCl₂ + H₂

Considering the Boyle's law, the new volume becomes 1,148,344.444 mL or 1148.34 L.

Boyle's law relates pressure and volume, stating that the volume occupied by a given mass of gas at constant temperature is inversely proportional to pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.

Boyle's law is expressed mathematically as:

P×V=k

Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:

P1×V1=P2×V2

In this case, you know:

Replacing in the Boyle's law:

10335.1 atm ×250 mL= 2.25 atm×V2

Solving:

(10335.1 atm ×250 mL)÷ 2.25 atm= V2

1,148,344.444 mL= 1148.34 L=  V2

Finally, the new volume becomes 1,148,344.444 mL or 1148.34 L.

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2 Na3PO4 (aq) + 3 Pb(NO3)2 (aq) --> 2 Pb3(PO4)2 (s) + 6 NaNO3 (aq)

The total ionic equation is

Spectator ions should not be removed here. Spectator ions are part of total ionic equation 6 Na+ (aq) + 2 PO43-(aq) + 3 Pb2+ (aq) + 6 NO3- (aq) --> 2 Pb3(PO4)2 (s) + 6 Na+ (aq) + 6 NO3- (aq)

Spectator ions should be removed now. Spectator ions are not part of total ionic equation

After removing Spectator ions, net ionic equation is:

3 Pb2+ (aq) + 2 PO43- (aq) -> 2 Pb3(PO4)2 (s)

Answer:

2+ 3 3 Pb (aq) + 2 PO4 (aq) -> 2 Pb3(PO4)2 (5)

Lead(II) nitrate,

Pb

(

NO

3

)

2

, and sodium bromide,

NaBr

, are soluble in an aqueous solution, which means that they dissociate completely to form cations and anions when dissolved in water.

Please check the attached file for brief answer.

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Answer:

26.5 L

Explanation:

To find the volume of the gas, you need to use the Ideal Gas Law. The equation looks like this:

PV = nRT

In this formula

-----> P = pressure (torr)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (62.36 L*torr/mol*K)

-----> T = temperature (K)

Before you can plug the given values into the equation, you need to convert Celsius (°C) to Kelvin (K). Then, you can solve for volume through simplification.

P = 760 torr                    R = 62.36 L*torr/mol*K

V = ? L                            T = 21 °C + 273.15 = 294.15 K

n = 1.1 moles

PV = nRT

(760 torr)V = (1.1 moles)(62.36 L*torr/mol*K)(294.15 K)

(760 torr)V = 20177.5134

V = 26.5 L

Answer:

Velcro was an accident.

Explanation:

hope it helps

sry if im wrong

Answer:

it was a accident

Explanation:

The molarity of the unknown solution prior to dilution is calculated to be 1.31M.

The molarity of a solution can be calculated using the following formula:

C1V1 = C2V2

Where;

10.5 × C1 = 80 × 0.172

10.5C1 = 13.76

C1 = 13.76/10.5

C1 = 1.31M

Therefore, the molarity of the unknown solution prior to dilution is calculated to be 1.31M.

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There are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2. Details about formula units can be found below.

Formula unit refers to the empirical formula of an ionic compound for use in stoichiometric calculations.

According to this question, there are 111g of CaCl2. The formula units can be calculated by multiplying the number of moles by Avogadro's number.

no of moles in CaCl2 = 111g ÷ 111g/mol = 1mol

Formula units of CaCl2 = 1mol × 6.02 × 10²³ = 6.02 × 10²³ formula units.

Therefore, there are 6.02 × 10²³ formula units of CaCl2 in 111 g CaCl2.

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The atmosphere protects life on earth by shielding it from incoming ultraviolet (UV) radiation, keeping the planet warm through insulation, and preventing extremes between day and night temperatures.

An atmosphere is the layers of gases surrounding a planet or other celestial body.

The three important functions of the atmosphere are:

1. The atmosphere protects life on earth by preventing it from incoming ultraviolet (UV) radiation.

2. The atmosphere keeps the planet warm through the insulation effect.

3. The atmosphere maintains extremes between day and night temperatures.

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Answer:

Suggest a structural reason why carbonic anhydrase synthesized with Ni2+, Fe2+, or Mn2+ in place of Zn2+ gives an enzyme with less catalytic efficiency.

Explanation:

in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal. 

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.

A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.

ρ = m/V

m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g

A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.

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The empirical formula of compounds formed from the given ions are as follows:

The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.

The empirical formula of compounds formed from the given ions are as follows:

In conclusion, the empirical formula is the simplest formula of a compound.

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In coordination chemistry,

A coordinate covalent bond also known as a dative bond, dipolar bond, or coordinate bond is a kind of two-center, two-electron covalent bond in which the two electrons derive from the same atom. The bonding of metal ions to ligands involves this kind of interaction.

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The value of Ka of the weak acid is 4.47 x 10^-3.

The acids that do not dissociate completely in the aqueous solution and remains in equilibrium are called weak acids. The acid dissociation constant of the weak acid is represented as Ka.

Consider a weak acid HA. Its dissociation reaction will be:

      HA        ----->      H+         +          A-

I    0.072                    0                       0

C     -x                       +x                      +x

E  0.072-x                  x                        x

Calculations:

pH = -log[H+]

1.80 = -log[H+]

[H+] = 0.01585 M

Hence, x = 0.01585 M

The value of Ka is calculated as:

Ka = x^2/0.072-x

= (0.01585)^2/(0.072 - 0.01585)

= 4.47 x 10^-3

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The mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.

Iron ores refers to minerals in which iron occur in combined form found in the earth's crust.

Some ores of iron include:

Molar mass of hematite, Fe₂O₃ = 160 g/mol

Molar mass iron = 56 g/mol

Percent mass of iron in hematite = 56/160 = 35%

The mass of hematite that contains 8.0×10³ kg of iron = 8.0 × 10³kg/0.35 = 2.29 × 10⁴ kg.

Therefore, the mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.

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7) From the coefficients of the equation, the answer is 4:5.

8) From the coefficients of the equation, for every 6 moles of carbon dioxide consumed, 1 moleof glucose is consumed. This means that 1.66 moles of glucose is produced. Glucose has a formula mass of 180.16 g/.mol, so the answer is (1.66)(180.16), which is about 300 grams.

9) From the coefficients of the equation, we know that for every 6 moles of water consumed, 1 mole of glucose is consumed. Since we want 150 grams of glucose, and glucose has a formula mass of 180.16 g/mol, we want 150/180.16 = 0.83 mol of glucose. Thus, we need 0.83(6) moles of water, which is 5 moles to 1 sf.

10) From the coefficients of the equation, we know that for every 6 moles of carbon dioxide produced, 6 molds of oxygen are produced. Since carbon dioxide has a formula mass of 44.009 g/mol, 55 grams is about 1.25 moles. Thus, since oxygen has a formula mass of about 32 g/mol, the answer is 32(1.25), which is about 55 grams.