How could measuring the melting point of a solid help decide whether it was a mixture or a compound?

This statement is true.

The dry adiabatic lapse rate is the average temperature dereses with heigh of 6.5 degree celsius.

What is adiabatic lapse?

The rate of decrease of temperature experienced by a parcel of air when it is lifted in the atmosphere under the restriction that it cannot exchange heat with its environment. For parcels that remain unsaturated during lifting, the (dry adiabatic) lapse rate is 9.8°C per kilometer.

it averages about 6.5 °C per kilometre (18.8 °F per mile) in the lower atmosphere (troposphere). It differs from the adiabatic lapse rate, which involves temperature changes due to the rising.

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Answer:

Density = 3 g/cm³

Explanation:

Density is a ratio which compares an object's mass per every 1 unit volume. Grams is a unit of mass and cm³ is a unit of volume. Since you have been given values for both a mass and volume, you can use them to determine the density.

Density = g/cm³                                     <----- Density units

Density = 90 g / 30 cm³                        <----- Insert values

Density = 3 g / 1 cm³                              <----- Simplify

Density = 3 g/cm³

Explanation:

no of moles = mass / molar mass

mr of Al ( OH)3 = 27+ (16 × 3) + (1 ×3)

= 78

n = 384.3 / 78

n = 4.92692...

n = 4.93

therefore, no of moles = 4.93

The molecular structures of sugars and alcohols are similar due to the presence of the -OH group.

This is a substance which has a sweet taste and is a form of simple carbohydrate.

They are however not similar due to the different numbers of Carbon atoms attached to the -OH group..

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Explanation:

 ionosphere can reflect radio waves directed into the sky back toward the Earth

Answer:

ʏᴇs, ɪ ᴛʜɪɴᴋ

Explanation:

TᕼᗩᑎKՏ ᒪOᗪՏ

Given metallic chloride formula =MCl3

It belongs to Nitrogen(N) family.

But the condition is that its transition element.

EC given by

\(\\ \sf\longmapsto 1s^22s^22p^63s^23p^64s^23d^3\)

\(\\ \sf\longmapsto [Ar]3d^3\)

Answer:

Should be Solute

Explanation:

I looked it up ;)

Answer:

c. Solute

Explanation:

The complete sentences are:

Page 3:

The effect of energy in phase transitions of matter is that it is required to break the intermolecular forces that hold the particles of a substance together. When energy is added to a substance, the particles move faster and the intermolecular forces are broken. This can cause the substance to change phase.

The interactive demonstration on the sample of water shows that energy is required to melt ice and boil water. When the ice is heated, the particles start to move faster and the ice melts. The temperature of the water stays constant at 0°C until all of the ice has melted. This is because the energy is being used to break the intermolecular forces in the ice. Once all of the ice has melted, the temperature of the water starts to rise again. When the water is boiled, the particles move so fast that they escape from the liquid state and become a gas. The temperature of the water stays constant at 100°C until all of the water has boiled. This is because the energy is being used to break the intermolecular forces in the water. Once all of the water has boiled, the temperature of the steam starts to rise again.

The complete sentences:

Page 4:

Heating curves show the temperature of a substance as it is heated. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Cooling curves show the temperature of a substance as it is cooled. The curve has a horizontal line at the melting and boiling points, which indicates that the temperature does not change during these phase changes.

Both curves show that the temperature of a substance increases as it is heated and decreases as it is cooled.

A heating curve is more choppy than a cooling curve because there are more phase changes during heating than during cooling.

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In yeast, the reaction is eleventh order:Rate = K[ enzyme ] [isocitrate]⁴[AMP]²[NAD⁺]m [Mg²⁺]². The order with respect to NAD⁺ is 2.

The citric acid cycle is also called the Krebs cycle. This is the main source of energy that happens in aerobic conditions.

The coefficient that is raised to the active concentration of the reactants is the order in the mass action law. It is determined experimentally and can be fractional, positive, negative, or zero.

Each reactant's order, which is increased to its power in the rate law, is added to determine the order of the entire reaction.

The overall rate = 11

Rate of overall reaction = 1 + 4 + 2 + m + 2 = 11

9 + m = 11

m = 2

Thus, the order with respect to NAD⁺ is 2.

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True. When ionic compounds are dissolved or thrown into water, they typically dissociate into ions and become electrolytes.

An electrolyte is a substance that conducts electric current when dissolved in water or molten form due to the presence of freely moving ions. Ionic compounds consist of positively charged cations and negatively charged anions held together by electrostatic forces. When they come into contact with water, the water molecules surround the ions and weaken the forces holding them together, causing the compound to dissociate into its constituent ions. These ions are then free to move in the aqueous solution and carry electric charge, allowing the solution to conduct electricity. Therefore, most ionic compounds can be considered electrolytes when dissolved in water.

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Answer:

Computer Models are used to study the complex phenomena in the universe.

Explanation:

The term 'models' can be defined as a representation of something that is real. A model is used to learn the phenomena of the natural world for easy understanding of it.

The computer models are used to study the large and complex data in the universe. These models are used to perform various calculations that, in real, would take years to do. It helps in studying the changes in variables, which in turn helps the scientist to know of any climatic change, or other changes in the nature.

The normality of the resulting mixture is 0.583N.

The normality is described as the number of gram or mole equivalents of solute present in one liter of a solution.

How to calculate the normality:

First, let's calculate the number of moles of NaOH in 0.4 g of the compound:

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

Number of moles of NaOH = 0.4 g / 40 g/mol = 0.01 mol

Next, we need to calculate the total number of acid equivalents in the mixture of HCl and H₂SO4:

Since NaOH is a strong base and reacts completely with the acid, the number of moles of NaOH is equal to the number of acid equivalents in the mixture.

Therefore, the normality of the resulting mixture is:

Normality = number of acid equivalents / volume of the mixture in liters

Normality = 0.045 N L / ((50 + 10) cc / 1000) L = 0.583 N

So the normality of the resulting mixture is 0.583N.

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The volume of this mixture at STP is mathematically given as

v=15.59L

Question Parameters:

A mixture contains 5.00 g

Generally, the equation for the number of moles   is mathematically given as

n=mass/molar mass

For O2

nO=5/32

nO=0.156mol

For N2

nN=5/28.02

nN=0.178

For CO2

nCO2=0.114mol

For Ne

nNe=0.248

In conclusion, total moles present

nT=0.156mol+0.178+0.114mol+0.248

nT=0.696

Hence, volume at stp

V=0.696*22.4

v=15.59L

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Answer:

See explanation

Explanation:

1 - Physical change

2 - Mixture

3 - Liquid

4 - Physical Properties

5 - Physical change

6 - Chemical change

7 - Melting

8 - Equals

9 - Conservation of mass

10 - Physical Property

11 - Distillation

The electrons present in the valence shell of an atom are responsible for the reactivity of atoms.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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The Lewis structure of the element have been shown in the image attached.

The valence electrons of an atom or molecule are depicted in a simplified manner by the Lewis structure, commonly referred to as the Lewis dot structure or electron dot structure. Gilbert N. Lewis, an American scientist, created it.

The valence electrons of an atom are shown in a Lewis structure as dots surrounding the element's symbol. These dots' placement reveals details about the connectivity and atom-atom bonding in a molecule.

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The answer is option

The reaction:

is a Synthesis reaction, because from 2 different substances it is produced

The translational partition function for H2 confined to a volume of 126 cm³ at 298 K is 1.06  × 10⁴⁴.

To evaluate the translational partition function for H2 confined to a volume of 126 cm³ at 298 K, we can use the following formula:

Qtrans = (V/(λ³)) * ((2πmkT)/\((h^{2})^{\frac{3}{2} }\)

Where V is the volume of the container, λ is the thermal de Broglie wavelength of the molecule, m is the mass of the molecule, k is the Boltzmann constant, T is the temperature, and h is the Planck constant.

For H2, the mass is 2.016 g/mol or 0.002016 kg/mol. The thermal de Broglie wavelength can be calculated using the formula:

λ = h / √(2πmkT)

Plugging in the values, we get:

λ = (6.626 ×10⁻³⁴ J s) / √(2π(0.002016 kg/mol)(1.38 × 10⁻²³ J/K)(298 K))

λ ≈ 2.47 × 10⁻¹⁰ m

Converting the volume of the container from cm³ to m³, we get:

V = 126 cm³ = 1.26 × 10⁻⁴ m³

Now we can calculate the translational partition function using the formula:

Qtrans = (V/(λ³)) × ((2πmkT)/\((h^{2})^{\frac{3}{2} }\)

Qtrans = ((1.26 × 10⁻⁴ m³)/(2.47 × 10⁻¹⁰ m)³) × ((2π(0.002016 kg/mol)(1.38 × 10⁻²³ J/K)(298 K))/(6. 626 × 10⁻³⁴ J s)²)^(3/2)

Qtrans ≈ 1.06  × 10⁴⁴

Therefore, the translational partition function for H2 confined to a volume of 126 cm³ at 298 K is approximately 1.06  × 10⁴⁴.

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If 89.5 grams of silver is produced, 105.45 grams of Cu reacted.

The Chemical equation is

Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag

The equation is balanced,

89.5 grams of Silver is produced in the reaction.

It is asked that how much Cu will be produced.

The amount of Copper can be calculated by using mole concept,

From the reaction,

When 1 moles of Copper Reacts, 2 moles of Ag are formed.

So, we can say,

Mole of Cu (n) = 2 x Moles of Ag

Mole of a compound can be found by using the formula,

Moles = Given mass of compound/Molar mass of the compound

So,

n = 2 x 89.5/107.87  moles

n = 2 x 0.82 moles

n = 1.64 moles.

Moles of Copper are 1.64.

So, the mass of Cu reacted will be

1 mole Cu = 63.55 grams

1.64 moles Cu = 1.64 x 63.55 grams

1.64 moles of Cu = 105.45 grams.

To produce 89.5 grams of silver, 105.45 grams of Copper would have reacted.

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1.0 M NaOH has the highest concentration of dissolved solutes and thus the highest boiling point.

The boiling point of an aqueous solution is determined by the concentration of dissolved solutes in the solution. The higher the concentration of solutes, the higher the boiling point of the solution. The boiling point of an aqueous solution of 1.0 M NaOH is approximately 101.5°C. This is due to the fact that, when an ionic compound is dissolved in water, the ions become surrounded by water molecules and the solution becomes more dense. As a result, the boiling point of the water is increased as the number of molecules per unit volume increases.

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In order to produce molten iron and carbon dioxide in a blast furnace, the following steps are typically taken:

Place limestone, coal, and iron ore in a blast furnace. (c)

Heat the blast furnace to high temperatures, causing the limestone to break down and release carbon dioxide. (d)

The carbon dioxide reacts with the coal to produce carbon monoxide, which then reacts with the iron ore to reduce it to molten iron. (a)

Pour off the molten iron from the bottom of the blast furnace. (b)

These steps are part of the process of producing iron in a blast furnace, which is a common method used in the production of steel and other iron-based products. It is important to follow proper procedures and safety protocols when working with blast furnaces, as they involve high temperatures and potentially hazardous materials.

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The percent ionization of a 0.331M solution of HCN is found to be 0.00337%.  The pH of the solution is  4.953. The correct option is E. 4.953.

To solve this problem, we need to use the equation for percent ionization:

% ionization = (concentration of ionized acid / initial concentration of acid) x 100%

We can rearrange this equation to solve for the concentration of ionized acid:

concentration of ionized acid = % ionization / 100% x initial concentration of acid

Plugging in the given values, we get:

concentration of ionized acid = 0.00337 / 100 x 0.331 = 0.000011187 M

Now, we can use the equation for the ionization of HCN to set up an expression for the equilibrium constant (Ka):

HCN + H2O ↔ H3O+ + CN-

Ka = [H3O+][CN-] / [HCN]

We can assume that the concentration of H3O+ is equal to the concentration of ionized acid, since the ionization of HCN produces one H3O+ ion for every HCN molecule that ionizes. We can also assume that the concentration of CN- is equal to the concentration of H3O+.

Therefore:

Ka = (concentration of ionized acid)^2 / (initial concentration of acid - concentration of ionized acid)

Plugging in the values we calculated, we get:

Ka = (0.000011187)^2 / (0.331 - 0.000011187) = 6.2 x 10^-10

Now, we can use the equation for the pH of a weak acid:

pH = pKa + log([A-] / [HA])

Since we assumed that the concentration of CN- is equal to the concentration of ionized acid, we can substitute [CN-] for [A-] and [HCN] - [CN-] for [HA]. We also know that pKa = -log(Ka).

Therefore:

pH = -log(6.2 x 10^-10) + log(0.000011187 / (0.331 - 0.000011187)) = 4.953

Therefore, the pH of the solution is e. 4.953.

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The - pH is 2.6 .You must know the hydronium ion concentration in moles per liter in order to calculate the pH of an aqueous solution (molarity).

The pH of Acids and Bases

For an acidic solution, [H3O+] > [OH-]

[H3O+] = [OH-] is the formula for a neutral solution.

For the fundamental answer: [H3O+] [OH-]

You must know the hydronium ion concentration in moles per liter in order to calculate the pH of an aqueous solution (molarity).

The formula pH = - log [H3O+] is then used to determine the pH.

You must know the hydronium ion concentration in moles per liter in order to calculate the pH of an aqueous solution (molarity). The formula pH = - log [H3O+] is then used to determine the pH.

ie, 0.075 - 0.34 = - 0.265.

-pH = 2.6.

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Answer:

When you're eyes or body has been exposed to chemicals. For 15 minutes straight

Explanation:

Answer:

The balloon transport system or Hot Air Balloon is one of several transportation methods in RuneScape. During the Enlightened Journey quest it can be used for travel between two locations. After the quest is complete, four more locations are available to be unlocked by completing respective journeys to those locations.

Explanation:

transportation

The equilibrium conversion of SO2 can be determined using the equilibrium constant and the initial mole fractions of SO2 and O2. The equilibrium conversion (Xeq) is given by the equation: Xeq = (nSO3eq / nSO2o) = K * (nSO2o / (nO2o * nN2o))^0.5.

Given that the mole fractions of SO2, O2, and N2 are 0.15, 0.20, and 0.65 respectively, we can calculate the initial mole fractions of SO2 (nSO2o), O2 (nO2o), and N2 (nN2o).

Using these values and the equilibrium constant (K = 87.824), we can calculate the equilibrium conversion of SO2 in the presence of N2.

However, if pure oxygen is used instead of air, the initial mole fraction of O2 (nO2o) would be 1. Therefore, using the same calculations, we can determine the equilibrium conversion of SO2 when pure oxygen is used.

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To find the equilibrium conversion of SO2 in a sulfur burner gas stream, we need to use the equilibrium constant expression and the given initial gas composition. The equilibrium conversion of SO2 can be calculated using the equilibrium constant and the percentages of SO2, O2, and N2 in the gas stream.

To find the equilibrium conversion of SO2, we need to use the equilibrium constant expression. The equilibrium constant (Kc) is given as 87.824 at 480°C. The conversion of SO2 can be calculated using the equation:

Equilibrium constant (Kc) = [SO3] / [SO2] * [O2]0.5

The given gas stream consists of 15% SO2, 20% O2, and 65% N2. Using these percentages, we can calculate the initial concentrations of SO2, O2, and N2. Then, we can substitute these values into the equilibrium constant expression to find the equilibrium conversion of SO2.

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The balanced chemical equation for the reaction between molecular nitrogen and hydrogen is:N2(g) + 3H2(g)  2NH3(g)

Let the rate of reaction of hydrogen be x mol/L/sec and that of nitrogen be y mol/L/sec. By examining the balanced equation, we see that 3 moles of hydrogen react with 1 mole of nitrogen to form 2 moles of ammonia.

That is:y/(-3) = x/1 = -0.0177 M/s

The negative sign is there because the reaction of nitrogen is occurring at a slower rate than the hydrogen reaction. Using the above equation, we can find the rate of nitrogen:

y = (-3) (0.0177 M/s) = -0.0531 M/s

Thus, the rate of nitrogen reacting is -0.0531 M/s.

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The equilibrium concentration of HI is 1.56 x 10-5 M and the equilibrium concentration of H₂ and I₂ is 7.8 x 10-6 M.

Given: The equilibrium constant, Kp, for the following reaction is 1.80 x 10-2 at 698 K.2HI(g) → H₂(g) + I₂ (g)

When equilibrium is reached, the concentration of H₂ is found to be 2.80 x 10-3 M. Calculate the equilibrium concentration of HI and I2.

Solution: Equilibrium constant, Kp = 1.80 x 10-2 at 698 K Since the equation is 2HI(g) → H₂(g) + I₂ (g),therefore the expression for Kp is given as,

Kp = [H₂] [I₂] / [HI]²

At equilibrium,[H₂] = 2.80 x 10-3 M We are to find the equilibrium concentration of HI and I2. Let the equilibrium concentration of HI be x and the equilibrium concentration of I2 be y. Molar concentration of H₂ = 2.80 x 10-3 M Using the equilibrium constant expression, Kp = [H₂] [I₂] / [HI]²= (2.80 x 10-3) (y) / (x)²= 2.80 x 10-3 (y) / (x²)---------------------eqn1We also know that,2HI(g) → H₂(g) + I₂ (g)Initially (before the reaction begins), concentration of HI = x and concentration of H₂ and I₂ are zero. Thus, initially, H₂ = 0and I₂ = 0At equilibrium, 2HI(g) → H₂(g) + I₂ (g).

Thus, initially the concentration of HI = x-moles. Then, for every 2 moles of HI that is converted, one mole of H₂ and one mole of I₂ are produced. So, the concentration of H₂ and I₂ at equilibrium would be x/2 moles. Because, for every 2 moles of HI that is converted, one mole of H₂ and one mole of I₂ are produced.[HI] = x M[H₂] = [I₂] = x/2 M Substituting the values in the expression derived above in eqn1,Kp = 1.80 x 10-2 = 2.80 x 10-3 (y) / (x²)= 2.80 x 10-3 (y) / x²x² = (2.80 x 10-3 y) / (1.80 x 10-2)= 0.15555y / 1Substituting the value of x² in the equation 1,1.80 x 10-2 = 2.80 x 10-3 (y) / 0.15555y1.80 x 10-2 = 18.00 y / 15555y1.80 x 10-2 = y / 865.3y = 1.56 x 10-5 M[H₂] = [I₂] = x/2 = (1.56 x 10-5 M) / 2= 7.8 x 10-6 M

∴ The equilibrium concentration of HI is 1.56 x 10-5 M and the equilibrium concentration of H₂ and I₂ is 7.8 x 10-6 M.

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