Which is an intensive property of a substance?
Odensity
O volume
O length
O mass

Answer:

The unknown base concentration can be calculated from

Explanation:

An acid–base titration is a quantitative method of analysis for the determination of the concentration of an acid or base by neutralizing it with a standard solution (solution of known concentration) of base or acid.

At the equivalence point, when all unknown  base neutralized by standard acid solution

the following is applied  

No. of equivalent of acid = No. of equivalent of base

Cₐ * Vₐ = Cb * Vb

where,

Cₐ: is the concentration of standard acid solution  (known).

Vₐ: is the volume of acid that neutralizes the base (known).

Cb: is the unknown base concentration (unknown).

Vb: is the volume of base that neutralized with the acid (known).

So, the unknown base concentration can be calculated from

The concentration of base in a titration is calculated using the formula: concentration of base (M) = moles of acid / volume of base (L). This calculation is based on the stoichiometry of the neutralization reaction, typically in a one-to-one mole ratio, and is performed after achieving neutrality as indicated by an indicator or pH meter.

To calculate the concentration of base in a titration, a known volume and concentration of an acid are titrated against the base with an unknown concentration. The formula used for this calculation is concentration of base (M) = moles of acid / volume of base (L). This equation comes from the stoichiometry of the neutralization reaction, which for monoprotic acids and bases is typically a one-to-one mole ratio.

Using the stoichiometry of the neutralization reaction, which in a simple acid-base reaction like HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l), is 1:1, you can determine the moles of base that react with the moles of acid. The moles of acid are calculated by multiplying the concentration of the acid by the volume of acid (in liters). Once neutrality is achieved, indicated by a color change of the indicator or a specific reading on a pH meter, the volume of base used is noted. The moles of acid originally present in the solution are equal to the moles of base since they react in a 1:1 ratio. This allows the calculation of the base concentration using the titrant volume and the known concentration of the acid.

Answer:

The mass of copper(II)sulfate are, 89.6 grams

Explanation:

Molecules of  =

Molar mass of  = 160 g/mole

First we have to calculate the moles of .

As,  number of atoms present in 1 mole of

So,  number of atoms present in  mole of

Now we have to calculate the mass of

Therefore, the mass of copper(II)sulfate are, 89.6 grams

Answer:

CO2 is a compound of carbon and oxygen.

Answer:

CO2

Explanation:

A compound is a  substance  that consists molecules that are formed by atoms from different elements that are bond together. According to this, from the options given, the compound is CO2.

The other options are not right because they only have one element.

Answer:

1.633L

Explanation:

P1 = 16.24psi

V1 = 0.700L

P2 = 6.961psi

V2 = ?

Using Boyle's law, P1V1 = P2V2

V2 = P1V1/P2

V2 = 16.24*0.7/6.961

V2 = 1.633L

Answer:

1. 0.6678 atm.

2. 181.9 mm Hg.

3. 379.8 K = 106.8°C.

4. 691.8 mm Hg.

Explanation:

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

(P₁T₂) = (P₂T₁)

Q1:

∵ (P₁T₂) = (P₂T₁)

P₁ = 0.5 atm, T₁ = 25°C + 273 = 298 K.  

P₂ = ??? atm, T₂ = 125°C + 273 = 398 K.

∴ P₂ = (P₁T₂)/(T₁) = (0.5 atm)(398 K)/(298 K) = 0.6678 atm.

Q2:

∵ (P₁T₂) = (P₂T₁)

P₁ = 47.0 mm Hg, T₁ = 77.0 K.  

P₂ = ??? mm Hg, T₂ = 25°C + 273 = 298 K.

∴ P₂ = (P₁T₂)/(T₁) = (47.0 mm Hg)(298 K)/(77 K) = 181.9 mm Hg.

Q3:

∵ (P₁T₂) = (P₂T₁)

P₁ = 248.0 kPa, T₁ = 0°C + 273 = 273 K. .  

P₂ = 345.0 kPa, T₂ = ??? K.

∴ T₂ = (P₂T₁)/(P₁) = (345.0 kPa)(273 K)/(248.0 kPa) = 379.8 K = 106.8°C.

Q4:

∵ (P₁T₂) = (P₂T₁)

P₁ = 745.0 mm Hg, T₁ = 22°C + 273 = 294 K. .  

P₂ = ??? mm Hg, T₂ = 0°C + 273 = 273 K.

∴ P₂ = (P₁T₂)/(T₁) = (745.0 mm Hg)(273 K)/(294 K) = 691.8 mm Hg.

Answer:

1) a. 2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).

2) a. 0.4477 mol.

b. 0.4477 mol.

c. 72.61 g.

Explanation:

1) Consider the following reaction:  iron (s) + chlorine (g) à iron (III) chloride

a. Write the balanced chemical equation.

So, the balanced chemical equation is:

2Fe(s) + 3Cl₂(g) → 2FeCl₃(s).

It is clear that 2 mol of Fe(s) react with 3 mol of Cl₂(g) to produce 2 mol of FeCl₃(s).

2) 25.0 g of iron reacts with excess chlorine gas.  

a. Calculate the moles of iron reactant.

n = mass/molar mass = (25.0 g)/(55.845 g/mol) = 0.4477 mol.

b. Calculate the moles of iron (III) chloride.

Using cross multiplication:

2 mol of Fe produce → 2 mol of FeCl₃, from stichiometry.

∴ 0.4477 mol of Fe produce → 0.4477 mol of FeCl₃.

∴ The no. of moles of iron (III) chloride produced is 0.4477 mol.

c. Calculate the mass of iron (III) chloride.

mass of  iron (III) chloride = (no. of moles)*(molar mass) = (0.4477 mol)*(162.2 g/mol) = 72.61 g.

The balanced chemical equation for the reaction between iron and chlorine is 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s). A total of 0.448 moles of iron reacts with excess chlorine to produce 0.448 moles of iron (III) chloride, with a mass of 72.67 g.

The balanced chemical equation for the reaction between iron (s) and chlorine (g) to form iron (III) chloride (FeCl3) is: 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s).

To calculate the moles of iron reactant, use the molar mass of iron, which is 55.85 g/mol. Moles of iron = mass of iron ÷ molar mass of iron = 25.0 g ÷ 55.85 g/mol = 0.448 moles of iron.

The stoichiometry of the reaction shows that 1 mole of iron reacts with 1.5 moles of chlorine to produce 1 mole of iron (III) chloride. Therefore, the moles of iron (III) chloride produced from 0.448 moles of iron is also 0.448 moles.

To calculate the mass of iron (III) chloride produced, multiply the moles of iron (III) chloride by its molar mass (162.20 g/mol). Mass of iron (III) chloride = moles of iron (III) chloride × molar mass of iron (III) chloride = 0.448 moles × 162.20 g/mol = 72.67 g.

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Answer:

During incomplete combustion of hydrocarbons/carbon carbon monoxide, water and carbon are produced as byproducts instead of CO2. Insufficient combustion usually takes place when the supply of air or oxygen is inadequate.

The general reaction of insufficient combustion:

Hydrocarbon + oxygen → carbon monoxide + carbon + water

In this reaction, carbon is produced as soot. Carbon monoxide is an air pollutant.

Impacts:

1- Incomplete combustion causes suffocation and ultimately death.

2- CO is taken inside the lungs and combines with hemoglobin molecules and reduces the oxygen-carrying capacity of the blood.

Answer:

3. a.) BECAUSE the positive protons and negative electrons must balance each other’s charges out

4. a.) BECAUSE the number of protons must stay the same even if the number of neutrons changes (atoms are partially defined by their number of protons)

5. b.) BECAUSE there are 3 atoms (2 hydrogen and 1 oxygen) and 10 electrons shared between them

Answer:

Explanation:

The equation tells you that for every mol of H2 you need 2 mols of Na to get it.

1 H2   /  4 mols H2  = 2  mols Na  /   x    Cross multiply

1*x = 4 * 2

x = 8 mol Na

Answer:

8 moles of sodium will react with water to produce 4.0 mol of  hydrogen in the reaction.

Explanation:

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other), the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

Then

[tex]x=\frac{c*b}{a}[/tex]

In this case you can see that by stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), they react and obtain:

But in this case 4 moles of hydrogen are produced. Then the rule of three applies as follows: If by stoichiometry 2 moles of sodium produce 1 mole of hydrogen, how many moles of sodium are needed to produce 4 moles of hydrogen?

[tex]moles of sodium=\frac{4molesofhydrogen*2molesofsodium}{1mole of hydrogen}[/tex]

moles of sodium=8

Then, 8 moles of sodium will react with water to produce 4.0 mol of  hydrogen in the reaction.

whats the question?????

Answer:

carbon monoxide (CO) or nitric oxide (NO),

Explanation:

When reduction occurs, an element gains electrons and its oxidation number decreases or is reduced (becomes more negative). To determine if a redox reaction has occurred and to identify the element oxidized and the element reduced: . Compare oxidation numbers from the reactant side to the product side of the equation.

Answer:

The VSEPR theory stands for the valence shell electron pair repulsion theory. It is a model used in chemistry to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.

Answer:

It predicts individual molecules from electron pairs surrounding the central atom.

Explanation:

Its A Valence Shell Electron Pair Repulsion Theory.

Hope my answer has helped you!

When temperature increases pressure also increases.

When temperature decreases pressure decreases.

That is why you have low tire pressure when it’s cold out

Temperature and Pressure have a direct relationship!

When Temperature increases ↑

Pressure increases ↑

When Temperature decreases ↓

Pressure decreases ↓

Answer:

covalent bond  

ionic bond

hydrogen bond

hope this helps enjoy

Explanation:

Final answer:

The elasticity seen in solids is due to the forces between atoms acting like springs that can be stretched or compressed but not easily broken. This allows solids to return to their original shape after the external forces causing deformation are removed.

Explanation:

Elasticity in solids is a result of the atoms in the material being in close contact and vibrating but not changing positions with neighboring atoms. The forces between the atoms act like springs that can be stretched or compressed but not easily broken. This resistance to deformation and ability to return to their original shape is what causes the elasticity seen in solids. For example, when a solid is stretched, the atomic springs are stretched, but when the force is removed, the springs bring the material back to its original shape.

The transfer of energy by heat flow through a substance is accomplished by convection.

Answer:

The real answer is conduction.

Trust me on this one, it's correct. If you put the other answer, you will get it wrong. The answer is conduction, and I am 100% positive! :)

The conversion of kinetic energy to potential energy is neither exothermic nor endothermic, as it involves the transformation of energy forms within a system, not heat transfer to or from the environment. Option D is correct.

The conversion of kinetic energy to potential energy does not involve heat transfer but rather the transformation of one form of mechanical energy to another within a system. An exothermic process is one in which energy is released to the surroundings, usually in the form of heat, such as when a solid burns brightly, while an endothermic process absorbs energy from the surroundings.

For example, when two chemicals are mixed and their temperature drops, it is considered endothermic because the chemical system absorbed heat from the surroundings.

Hence, D. is the correct option.

Answer:

Helium

In the sun, hydrogen is converted to __Helium__ through nuclear fusion.

Answer:

helium

Explanation:

Answer:

True

Explanation:

Soluble substances dissolve.

Therefore they wouldn't be called soluble if they can't dissolve in solvents

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Pls mark as Brainliest.

Soluble substances can dissolve in certain solvents this statement is true.

Hence, the given statement is true.

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Answer:

Heating this gas to 55 °C will raise its volume to 6.87 liters.

Assumption: this gas is ideal.

Explanation:

By Charles's Law, under constant pressure the volume [tex]V[/tex] of an ideal gas is proportional to its absolute temperature [tex]T[/tex] (the one in degrees Kelvins.)

Alternatively, consider the ideal gas law:

[tex]\displaystyle V = \frac{n \cdot R}{P}\cdot T[/tex].

Therefore the volume of the gas is proportional to its absolute temperature.

Either way,

[tex]V\propto T[/tex].

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1}[/tex].

For the gas in this question:

Convert the two temperatures to degrees Kelvins:

Apply Charles's Law:

[tex]\displaystyle V_2 = V_1\cdot \frac{T_2}{T_1} = \rm 6.24\;L \times \frac{328.15\; K}{298.15\;K} = 6.87\;L[/tex].

The correct option is b. 6.87 L.

To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature in Kelvin at constant pressure. Mathematically, this can be expressed as:

 [tex]\[ \frac{V_1}{T_1} = \frac{V_2}{T_2} \][/tex]

 where [tex]\( V_1 \) and \( T_1 \)[/tex] are the initial volume and temperature of the gas, respectively, and [tex]\( V_2 \) and \( T_2 \)[/tex] are the final volume and temperature of the gas, respectively.

First, we need to convert the temperatures from Celsius to Kelvin:

[tex]\[ T_1 = 25.0^\circ C + 273.15 = 298.15 \text{ K} \][/tex]

[tex]\[ T_2 = 55.0^\circ C + 273.15 = 328.15 \text{ K} \][/tex]

Now we can rearrange Charles's Law to solve for the final volume [tex]\( V_2 \):[/tex]

[tex]\[ V_2 = V_1 \times \frac{T_2}{T_1} \][/tex]

 Substituting the given values:

[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15 \text{ K}}{298.15 \text{ K}} \][/tex]

[tex]\[ V_2 = 6.24 \text{ L} \times \frac{328.15}{298.15} \][/tex]

[tex]\[ V_2 = 6.24 \text{ L} \times 1.1007 \][/tex]

[tex]\[ V_2 \approx 6.87 \text{ L} \][/tex]

 Therefore, the new volume of the gas after the temperature increase is approximately 6.87 L.

Answer:

Electronegativity increases and metallic

properties decrease.

Explanation:

The statement which describes the general trends in electronegativity and metallic properties as the elements in Period 2 are considered in order of increasing atomic number are;

For electronegativity:

For metallic properties:

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Answer:

The red liquid in a thermometer tells you what temperature the thermometer has. So when you dip that thermometer in a warm substance, the red liquid (generally mercury) rises because the warmth makes the liquid expand or jump. The vice versa occurs with a cold substance. That's why you see the liquid going down when you put the thermometer on an ice cube.

Explanation:

Final answer:

A thermometer measures temperature by relying on the thermal expansion and contraction of a substance such as mercury or alcohol within a reservoir. The liquid's volume changes are visible along a graduated scale, providing a temperature reading. Material properties like specific heat and thermal conductivity are critical in thermometer design for performance and accuracy.

Explanation:

A thermometer operates on the principle of thermal expansion, which is the tendency of a substance to change in volume in response to a change in temperature. When a substance is heated, its particles move more vigorously, causing it to expand. Conversely, when the substance is cooled, the particles lose energy and move less, leading to contraction. This behavior is harnessed in a thermometer.

In the case of a mercury or alcohol thermometer, the liquid inside the reservoir expands as it is heated and contracts when it cools. This causes the visible level of the liquid to rise or fall along a calibrated scale, corresponding to the temperature. It's important that the material used for this liquid has uniform thermal expansion properties over the temperature range of interest. This ensures that the thermometer provides a reliable measurement of temperature changes.

When designing a thermometer, aspects such as specific heat and thermal conductivity must be considered. A material with high specific heat requires more energy to change its temperature, which can slow down the response time of the thermometer. On the other hand, thermal conductivity impacts how quickly the material reaches thermal equilibrium with its surroundings, which affects the speed of the reading as well.

Answer:

The answer is 1-butene

Explanation:

Answer:

C₃H₈₍g₎ + 5O₂₍g₎→  3CO₂₍g₎ + 4H₂O₍l₎

Explanation:

Propane is an alkane that burns in enough oxygen to produce carbon (iv) Oxide and heat as the only by products. Balancing the equation: The number of atoms of each kind on either side should be equal. Hydrogen on the left has eight atoms same as the right side after balancing, oxygen has 10 while carbon has 3 on each side.

Answer:The value of the coefficients are:

[tex]a_o=1,a_1=5,a_2=3,a_3=4[/tex]

Explanation:

Number written in front of the molecule or element in balanced chemical reaction is known as stoichiometric coefficient.

[tex]a_oC_3H_8 +a_1O_2 \rightarrow a_2CO2 +a_3H2O[/tex]

The balance chemical reaction will be given by:

[tex]1C_3H_8 + 5O_2 \rightarrow 3CO2 + 4H2O[/tex]

[tex]a_o=1,a_1=5,a_2=3,a_3=4[/tex]

1 mole of octane reacts with 5 moles of oxygen gas to gives 3 moles of carbon dioxide and 4 moles of water as a product.

Nitric acid does NOT react with water, water disassociates the molecules into those ions (above). ... Water,Being a polar solvent,…makes HNO3 ionise or dissociate or simply break down into Hydronium ions, i.e,H+ or H3O+ ions and nitrate NO3- ions..that's all.

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HNO3, or nitric acid, when placed in water, ionizes completely, producing hydronium ions (H3O+) and nitrate ions (NO3-). It can also engage in neutralization reactions with bases to form water and a salt.

When nitric acid (HNO3) is placed in a water solution, it ionizes completely to produce hydronium ions (H3O+) and nitrate ions (NO3-). In this reaction, nitric acid acts as a strong acid. This can be represented by the following equation: HNO3 + H2O → H3O+ + NO3-.

Nitric acid can also react with other substances in water. For example, when HNO3 reacts with a base like Ba(OH)2, a neutralization reaction occurs to form water and a salt (Ba(NO3)2): Ba(OH)2 (aq) + 2HNO3(aq) → Ba(NO3)2(aq) + 2H2O(l).

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Answer:

1.429 g of  N₂

Explanation:

The Haber process is a reaction that combines nitrogen with hydrogen to form ammonia according to the following balanced equation:

One can note that 1 mol of N₂ react with H₂ to produce 2 mol of NH₃.

We cannot compare weight of a substance (in grams) to another in chemical reactions, but we can use moles, then we have to convert the weight of NH3 to moles.

no. of moles of NH₃ = (mass / molar mass) = (1.7 g / 17 g/mol) = 0.1 mol

and the actual yield is 98% , then the theoretical number of moles that would be produced are:  

98 = (0.1 mol /  theoretical yield) × 100

theoretical no. of moles of NH₃ = (0.1 * 100) /98 = 0.102 mol

using cross multiplication

1 mol of N₂ → 2 mol of NH₃.

?? mol of N₂ → 0.102 mol of NH₃.

no of moles of N₂ = [(1 mol * 0.102 mol) / 2 mol] = 0.051 mol

Last step is to convert the moles back to grams using:

mass = (no of moles of N₂  * molar mass of N₂)

         = (0.051 mol * 28 g/mol) = 1.429 g

Answer:

Explanation:

Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Answer: Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions.

Explanation: Kinetic Molecular Theory can be used to explain both Charles' and Boyle's Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.

Answer:

redox reaction

Explanation:

it's the only reaction occurs simultaneously, reduction and oxidation occur at the same time

Answer:

Gas

Explanation:

Nitrogen is an element. It's a gas at room temperature. Nitrogen makes up about 78% of the Earth's atmosphere. Liquid nitrogen is very cold, so it is often used to freeze food.

Answer:

B. Cementation

Explanation:

The processes by which sediments are changed into rock are complex, but can be simplified into two processes, called compaction and cementation. Rounded sediment grains (ooliths) bound together with crystalline calcite.

Answer:

The correct answer is option B, that is, cementation.

Explanation:

The procedures by which the sediments are modified into rocks are composite, however, can be simplified into two procedures, known as cementation and compaction. In geology, cementation refers to welding and hardening of clastic sediments, that is, those produced from the preexisting fragments of rocks due to the precipitation of the mineral matter in the pore gaps. It is the ultimate phase in the production of sedimentary rock.