Which of the following materials fall in the category of a ‘‘pure substance’’?


Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, brick, wood, Air​

•Saturated Solution: A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called a saturated solution.

Example: A soda is a saturated solution of carbon dioxide in water. This is why, when the pressure is released, carbon dioxide gas forms bubbles.

•Unsaturated solution: It is a solution in which more of solute can be dissolved at a given temperature. In this, addition of solute is possible till the solution reaches the point of saturation.

Example: Salt dissolved in water even sugar dissolved in water is an Unsaturated solution if the quantity of dissolved Salt/Sugar is below the saturation point.

[tex]\boxed{\sf{ \purple☘Saturated \: Solution\purple☘} }[/tex]

A solution that contains the maximum amount of solute that is capable of being dissolved.

[tex]\pink★[/tex]Example : 36g of salt in 100g of water

[tex] \: \: \: \: \: \: \: \: \: \: \: \: [/tex]

[tex]\boxed{\sf{ \purple☘Unsaturted \: Solution\purple☘}}[/tex]

A solution in which more solute can be dissolved.

[tex]\pink★[/tex]Example : The solution of sugar, salt etc in water.

Distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

Water Distillation Systems has several advantages and some of the advantages include;

Thus, distilling ocean water would be a good solution to meet this community's water needs because it will prevent some water borne diseases such as cholera, diarrhea, typhoid etc.

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Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

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Answer:

Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

What is an experience?

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

Daryl has visited many other countries.

Alfonso has developed many strong friendships

Marion has worked at jobs that improved his time-management skills.

Explanation:

The molarity of a solution prepared by dissolving 3.11 grams of NaOH in

enough water to make 300 milliliters of solution is 0. 256 mol/ L

Explanation:

Molarity (M) is the amount of a substance in a given volume of solution. It is otherwise known as the number of moles of solute in a certain amount of solution.

The unit of molarity is mol/L

Molarity = number of moles of solute divided by the volume of the solution\

Molarity = ?

Number of  moles is calculated using :

Mass of the solute = 3.11 grams of NaOH

Molar mass of the solute = Na + O + H

Let's input the atomic numbers of the elements: Na (23) , O (16) , H (1)

Molar mass of NaOH = 23 + 16 + 1 = 40 g/ mol

Number of moles = 3.11 ÷ 40 = 0.077 mol

Volume of the solution is measured in Liters

Let's convert 300 milliters to liters = 300 divided by 1000 = 0.3 Liters

Molarity = 0.077 ÷ 0.3 = 0. 256 mol/ L

Therefore, the Molarity of the solution is 0. 256 mol/ L

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The moderately reactive atoms located in the periodic table is fluorine, chlorine, bromine, and iodine which means the  halogens family.

They are the five non-metals in family 7A of the periodic table. Halogens are chemical elements that form inorganic salts. In the periodic table they are part of group 17 or family 7A.

Halogens are strong oxidants and react mainly with alkali metals (Family I A) which tend to donate an electron. They also react with metals and noble gases (Family VIII A).

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Answer:

Incisors: These are the teeth at the front of the mouth and the most visible ones when we smile. Bicuspids: Also called premolars, the bicuspids come after the canines and are flatter than the canines and incisors. Molars: At the back of your mouth, you'll find wide, flat molars.

Explanation:

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Answer:

50g of MgO

Explanation:

2Mg +O2 -----------> 2MgO

2moles of Mg needs 1mole of O2 for complete reaction ie

48g/mol of Mg --------- 32g/mol of O2

Xg of Mg --------- 30g of O2

X=45g of Mg

30g of O2 needs 45g of Mg, but only 30g of Mg is available, thus Mg is the limiting reagent.

2mole of Mg produces 2moles of MgO

ie 48g/mol of Mg ---------- 80g/mol of MgO

==> 30g of Mg -------------- Xg of MgO

X= 50g of MgO.

Answer:

A: as the liquid gets warmer more particles have sufficient energy to escape from the liquid. Eventually, particles in the middle of the liquid form bubbles of gas in the liquid.

A: the temperature will only increase once all the liquid particles change to gas.

Explanation:

Answer:

Mg

Explanation:

Mg requires more ionization energy to ionize because it has more protons than Na. If an atom, located within the same period, has more protons, the pull on the electrons will be greater. This makes it more difficult to remove these electrons during ionization.

As a general rule, ionization energy decreases as you go down a column and increases as you move to the right on the periodic table. Therefore, the elements with the highest ionization energies are located on the top right of the periodic table. Ionization energies increase across a group due to the quantity of protons increasing. Ionization energies decrease as you go down a column because the outermost electrons are further from the nucleus (where the protons are), making it easier to remove them.

in digital signals, codes are used while in analogue signals do not use signals.

Signals are defined as the instructions which are transferred to another source in other to deliver a message.

There are two types of signals which include the digital and analogue signals.

The digital signals uses codes which is a secret way of sending messages while analogue doesn't use codes.

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Answer:

200 torr

Explanation:

because it have 250ml when we subtract the 50 we get answer

Taking into account the definition of dilution, if you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, you need to add more solvent until you get a final volume of 500 mL.

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

In this case, you know:

Replacing in the definition of dilution:

1 M× 100 mL= 0.2 M× Vf

Solving:

(1 M× 100 mL)÷ 0.2 M= Vf

500 mL= Vf

In summary, if you needed to make 100 mL of a 0.2 M fruit drink solution from the 1.0 M fruit drink solution, you need to add more solvent until you get a final volume of 500 mL.

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Answer:

A- c7h6br2

Explanation:

i just got it right :)

Given the heat of fusion for aluminum is 3.95 kJ/g, it takes 198 kJ of energy to melt 50.0 g of aluminum.

It is a physical process in which a solid absorbs energy in the form of heat to melt into a liquid.

The heat of fusion (ΔH°fus) for aluminum is 3.95 kJ/g. We can calculate the amount of energy (Q) required to melt 50.0 g (m) of aluminum using the following expression.

Q = ΔH°fus × m = 3.95 kJ/g × 50.0 g = 198 kJ

Given the heat of fusion for aluminum is 3.95 kJ/g, it takes 198 kJ of energy to melt 50.0 g of aluminum.

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Considering the Boyle's law, as the pressure decreases, volume increases and has a value of 2.246 mL.

Boyle's law establishes the relationship between the pressure and the volume of a gas when the temperature is constant.

This law says that the volume occupied by a given mass of gas at constant temperature is inversely proportional to the 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

If an initial state 1 and a final state 2 are analyzed, Boyle's law is expressed as:

P1×V1=P2×V2

In this case, you know:

Replacing in Boyle's law:

3.46 atm× 0.650 mL= 1 atm×V2

Solving:

V2= (3.46 atm× 0.650 mL)÷ 1 atm

V2= 2.246 mL

Finally, as the pressure decreases, volume increases and has a value of 2.246 mL.

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Answer:

Protons (Hydrogen Ions) transfer between conjugate acid-base pair.

Explanation:

Answer:

hope this will help you......

The resulting pressure of the gas after decreasing the initial volume is 3 atm.

According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:

P ∝[tex]\frac{1}{V}[/tex]

For the given question required equation is:

P₁V₁ = P₂V₂, where

P₁ = initial pressure = 1.5 atm

V₁ = initial volume = 2 L

P₂ = final pressure = ?

V₂ = final volume = 1 L

On putting all these values on the above equation, we get

P₁V₁ = P₂V₂

P₂ =[tex]\frac{1.5}{2X1}[/tex] = 3atm

Hence required pressure is 3 atm.

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Answer:

¿Cuál será el pH de una disolución saturada de hidróxido de cinc?.

Explanation:

Dato: Kps (Zn(OH)2) = 1,8 x 10-14. Solución: 9,52.

The molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

The measure of the degree to which a substance gets dissolved in a solvent to become a solution.

The formula for determination of molar solubity is

[tex]\rm K_{sp} = [A^+]^a [B^-]^b[/tex]

[tex]\rm K_{sp}[/tex]          = solubility product constant

[tex]\rm [A^+]^a[/tex]  =     cation in an aqueous solution

[tex]\rm [B^-]^b[/tex]  = anion in an aqueous solution

a, b          = relative concentrations of a and b

We have the data given as

[tex]\rm K_{sp}[/tex] for Ag₂CrO₄ is 8 x 10⁻¹²

For Silver chromate , the solubility would be only one-half of the Ag⁺ concentration.

We denote the solubility of Ag₂CrO₄ as S mol L⁻¹.

Then for a saturated solution, we have

[Ag⁺]=2S

[CrO₂⁴⁻]=S

the relation between the solubility and the solubility product constant depends on the stoichiometry of the dissolution reaction

(2S)²(S)=4S³ = 8 * 10⁻¹²

S=∛ (2*10⁻¹²)

S= 1.26 * 10⁻⁴ M

2S = 2.52 * 10⁻⁴ M

Therefore the molar solubility in water of Ag₂CrO₄ is 2.52 * 10⁻⁴ M .

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1.905 moles of Helium gas are in the tube. Hence, option A is correct.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Calculate the moles of the gas using the gas law,

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 4.972 atm

V= 9.583 L

n=?

R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]

T=31.8 +273= 304.8 K

Putting value in the given equation:

[tex]\frac{PV}{RT}[/tex]=n

n= [tex]\frac{4.972 \;atm\; X \;9.583 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X 304.8}[/tex]

Moles = 1.905 moles

1.905 moles of Helium gas are in the tube. Hence, option A is correct.

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Answer:

see below

Explanation:

When a substance goes from a solid to a gas without going through a liquid stage .     Mothballs is an example.

Answer:

V H2SO4=30 ml=0.03 l

Cm=16M

CM=n/V

n=CM×V

n= 0.48 moles H2SO4

Cm=0.48/0.3

CM=1.6M

Answer B

The difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.

Isotopes are two or more types of atoms of the same element that have the same atomic number but differs in mass numbers due to different numbers of neutrons in their nuclei.

Argon atom with a mass number of 38 (Ar-38) - number of neutrons = 20

Argon atom with a mass number of 45 (Ar-45) - number of neutrons = 27

Thus, the difference between Argon-38 and Argon - 45 is the number of neurons in their nuclei.

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Answer:

(70 x 2 + 16 x 3) x 29/70 x 2 = 38,9428571 g.

Explanation:

The insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

The insecticides could kill the owls but not the grasshopper or mice because the active ingredients in that insecticide is harmful for owls while on the other hand, the grasshopper and mice are tolerant to that insecticide.

So we can conclude that the insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

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The reaction:

C2H4 + H2 = C2H6

what is the maximum mass of ethane (c2h6) that can be formed?

The amount of hydrogen:

n(H2) = m(H2) / M(H2) = 5.28 / 2 = 2.64 mol

The amount of ethylene:

n(C2H4) = m(C2H4) / M(C2H4) = 9.91 / 28 = 0.354 mol

We see that the hydrogen is an excess reagent

The maximum mas of ethane is:

m(C2H6) = n(C2H4) * M(C2H6) = 0.354 * 30 = 10.62 g

what is the formula for the limiting reagent? - C2H4

what mass of the excess reagent remains after the reaction is complete? grams

The amount of hydrogen after reaction:

n2(H2) = 2.64 - 0.354 = 2.286 mol

m2(H2) = 2.286 * 2 = 4.572 g

Answer: m(C2H6)=10.62 g; C2H4; m2(H2)=4.572 g

Addition of water to an alkyne gives a keto‑enol tautomer product and that is the product changed into 2-pentanone, then the alkyne need to had been 1-pentyne. 2-pentyne might have given a combination of 2- and 3-pentanone.

They carries a carbonyl bond even as enol implies the presence of a double bond and a hydroxyl group. The keto-enol tautomerization equilibrium is depending on stabilization elements of each the keto tautomer and the enol tautomer.

Answer:

1. HCl + Fe

2. HNO3 + NaOH

Explanation:

Answer:

1) acid + metal --> salt + h2
2) acid + base --> salt + water

Explanation:

btw in number 1... h2 is 2 atoms of hydrogen

example:
1) 2HCL + 2NA --> 2NACL + H2

2) HCL + NAOH --> NACL + H2O

Answer:

3 grams

Explanation:

14 g of N2   is 1/2 mole

  If you halve the N2   in the balanced equation , you have to halve the H2 down to 1.5 moles of H2    which is 3 grams