The reactants of two chemical equations are listed.
Equation 1: AgNO3 + Zn
Equation 2: AgNO3 + MgCl2
Based on the type of reaction, which reaction can be used to extract silver metal from silver nitrate solution?

Answer:

Bubbles formed where the acid touched the limestone. After 20 minutes, the bubbling stopped and the surface of the limestone appeared unchanged.

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Taking into account the reaction stoichiometry, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

In first place, the balanced reaction is:

N₂H₄ + 2 H₂O₂ → N₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 34 grams of H₂O₂ reacts with 32 grams of N₂H₄, 8.73 grams of H₂O₂ reacts with how much mass of N₂H₄?

\(mass of N_{2} H_{4} =\frac{8.73 grams of H_{2} O_{2}x 32 grams of N_{2} H_{4} }{34grams of H_{2} O_{2}}\)

mass of N₂H₄= 8.22 grams

But 8.22 grams of N₂H₄ are not available, 5.16 grams are available. Since you have less mass than you need to react with 8.73 grams of H₂O₂, N₂H₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of N₂H₄ form 28 grams of N₂, 5.16 grams of N₂H₄ form how much mass of N₂?

\(mass of N_{2} =\frac{5.16 grams of N_{2} H_{4} x28 grams of N_{2}}{32 grams of N_{2} H_{4} }\)

mass of N₂= 4.515 grams

Then, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

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\(K_{sp}\) of the compound is found to be  5.04 ×\(10^{-10}\).

Solubility :Solubility can be define as the amount of a substance that dissolves or mixes in a given amount of solvent at specific conditions.

Solubility equilibrium

Ksp = \([A^{+} ]^{a}\) \([B^{-} ]^{b}\)

Ksp = solubility product constant

A+ = cation in an aquious solution

B- = anion in an aqueous solution

a, b = relative concentrations of a and b

Given,

Solubility = s = 3.60 × \(10^{-2}\) g/L

molar mass = 288 g/ mol

∴ s= 3.60 × \(10^{-2}\) g/L ÷ 288 g/ mol = 1.25 ×\(10^{-4}\) mol/ L

Reaction:

MX3 ⇄ M + 3X

           s       3s

\(K_{sp}\) =[ \(M^{+3}\)] [ \(X^{-1}\)\(]^{3}\) = solubility product

∴ \(K_{sp}\) =\([s]^{} [3s]^{3}\)

∴ \(K_{sp}\) = 3 \(s^{4}\)

∴ \(K_{sp}\) = 3 × (3.60 × \(10^{-2}\) \()^{4}\)

∴ \(K_{sp}\) = 503.8848 ×\(10^{-8}\)  = 5.04 ×\(10^{-10}\)

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The free energy is 6.128 kJ/mol

Free energy, also known as Gibbs free energy, is a thermodynamic quantity used to describe the energy available to do work in a system

The concept of free energy is important in many areas of chemistry, including chemical thermodynamics, biochemistry, and materials science. It is used to understand and predict the behavior of chemical reactions, phase transitions, and other thermodynamic processes.

ΔG = ΔG° + RTlnQ

ΔG = 3.2 * 10^3 + (8.314 * 295 * ln(3.3)

=   3.2 * 10^3 + 2.928 * 10^3

= 6.128 * 10^3 J/mol

or 6.128 kJ/mol

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Answer:

The temperature changed

answer and explanation

the question can be solved using Boyle's law which states

P1V1 = P2V2

P1 = 1.2 atm

V1 = 25 mL

V2 = 44.6 mL

P2 = ?

solution

rearrange the formula to make P2 the subject of the equation as follows:

P2 = P1V1/V2

= (1.2 x 25)/44.6

= 0.67 atm

the pressure will be 0.67 atm

First, we have to find the number of moles of each element. The molar mass of phosphorus is 31 g/mol and the molar mass of bromine is 80 g/mol (You can find this in the periodic table):

And then, we have to divide each value by the least value obtained. In this case, we have to divide everything by 0.165:

We're going to have 1 mol of phosphorus and 3 moles of bromine obtaining the empirical formula PBr3.

Answer:

Antacids are bases that react stoichiometrically with acid. The number of moles of acid that can be neutralized by a single tablet of a commercial antacid will be determined by back titration.

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Answer:

Mass is the amount of mass an object contains. Mass is measured using a scale. Volume is the amount of space matter takes up. Hope this helps you get an idea in your head!

Explanation:

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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To find the density, we need to know the value of mass and volume. We can find the volume of the cube, using the formula of cube's volume:

Where a is the value of side, in this case, is 15.6 mm:

Now, let's convert the volume from mm^3 to cm^3. Remember that 1 cm^3 equals 1000 mm^3:

And we can replace the data that we have in the formula of density:

The answer is that the density of the cube of aluminum of side 15.6 mm is 1.11 g/cm^3.

Answer:

c

Explanation:

To calculate the atomic mass of any chemical element, you must use the following mathematical pattern:

1st: multiply the mass number of each isotope by its percentage.

2nd: sum all the results found in the first step.

3rd: divide the sum found in the second step by 100.

So:

1st: multiply the mass number of each isotope by its percentage.

112 x 0.95 = 106.4

114 x 0.65 = 74.1

115 x 0.34 = 39.1

116 x 14.24 = 1651.84

117 x 7.57 = 885.69

118 x 24.01 = 2833.18

119 x 8.58 = 1021.02

120 x 32.97 = 3956.4

122 x 4.71 = 574.62

124 x 5.98 = 741.52

2nd: sum all the results found in the first step.

106.4 + 74.1 + 39.1 + 1651.84 + 885.69 + 2833.18 + 1021.02 + 3956.4 + 574.62 + 741.52 = 11883.87

3rd: divide the sum found in the second step by 100.

11883.87/100 = 118.8387

Atomic mass of Tin: 118.8387

Answer:

covalent bond

Explanation:

a covalent bond forms when electrons are shared between two nonmetals

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Answer:

The 3 states of matter are Solid, Liquid, and Gas.

Explanation:

Some phases changes include

Answer:

Explanation:

A homogeneous mixture consists of one single phase while a heterogeneous mixture consists of two or more phases.

Answer:

2AgNO³(l) → 2Ag(s) + O²(g) + 2NO²(g)

Explanation:

I used powers ³,²,²

So change them to be down

Answer:

85Rb: 72.15%

87Rb: 27.85%

Explanation:

The average atomic mass of an atom is the sum of all [atomic abundance of isotope]*[mass of isotope].

Rubidium has only two isotopes, so let the atomic abundance of 85Rb be x, thus making the atomic abundance of 87Rb equal to 1-x.

[Average atomic mass of Rb] = [Mass of 85Rb]*[atomic abundance of 85Rb] + [Mass of 87Rb]*[atomic abundance of 87Rb]

85.4678 = 84.9117x + 86.9085*(1-x)

85.4678 = 84.9117x + 86.9085 - 86.9085x

85.4678 = 84.9117x + 86.9085 - 86.9085x

-1.4407 = -1.9968x

Atomic abundance of 85Rb = x = 0.7215 = 72.15%

Atomic Abundance of 87Rb = 1 - x = 1 - 0.7215 = 0.2785 = 27.85%

Answer:  There are three main types of forests: tropical rainforests, deciduous forests, and coniferous forests. Tropical rainforests are found near the equator (the center of Earth), where they are warm all year round.

Explanation:

Ecosystems are defined as a geographical region where biotic factors like animals, plants and microorganisms live together and interact with the abiotic factors.

The three forest ecosystems are temperate, boreal and tropical.

Tropical forest ecosystems have high precipitation and temperature also a high humidity rate. The plant has a twelve-month growing period and the forests are found near the equator regions.

Temperate is found in between the boreal and the tropical forests, it has a high level of rainfall and humid conditions and is covered with the deciduous type of trees.

Boreal or the taiga forest ecosystems are located in the subarctic regions with low temperatures and have long winters. They are covered majorly by the scale-leaved evergreen and the needle leaves cones.

All three forest ecosystems have great species diversity, the tropical and the temperate forest have dense vegetation and the temperate and boreal have evergreen forests.

Therefore, three forest ecosystems are temperate, boreal and tropical.

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Answer:

H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + NO₃⁻(aq) + H₂O(l)

Explanation:

First, we will write the molecular equation for the neutralization reaction between nitric acid and sodium hydroxide.

HNO₃(aq) + NaOH(aq) → NaNO₃(aq) + H₂O(l)

The total ionic equation includes all the ions and the molecular species.

H⁺(aq) + NO₃⁻(aq) + Na⁺(aq) + OH⁻(aq) → Na⁺(aq) + NO₃⁻(aq) + H₂O(l)

EXPLANATION:

The atmospheric pressure can be considered to calculate the moles of gas collected, but it must be assumed that the vessel in which the gas is being collected has a water level equal to the vessel that is in contact with the environment, so the pressure inside the gas collector will be equal to the atmospheric pressure.

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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1) Write the chemical equation

2) Convert grams of octane to moles of octane

The molar mass of octane is 114.33 g/mol

3) Calculate the heat of the reaction

Use the heat of reaction of the balanced reaction to make a conversion factor.

2 C8H18 = -11018kJ

The heat of reaction for 75.00 g of octane is -3614kJ.

.

The density of a piece of wood with the given values for its mass and volume would be = 0.042g/cm³

Density is defined as the quantity that shows how the particles or molecules of a substance as packed together in a unit mass. It is therefore known as the mass per unit volume of a substance.

Density is very important because in a liquid medium, it allows us to determine what substances will float and what substances will sink.

Mathematically, density can be represented as follows:

Density = mass/volume = m/v, which is measured in kg/m³ or g/cm³.

The volume of the wood = 4× 6× 8 = 192cm³

The mass of the given wood = 8g

The density = 8/192 = 0.042g/cm³

Therefore, the density of the piece of wood which has the following given values would be = 0.042g/cm³.

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Complete question:

A rectangular piece of wood measures 4cm by 6cm by 8cm and has a mass of 8g. What is the density of wood of the piece?

Here are the chemical formulas for the given ionic compounds:

To convert Name to Formula:

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Answer:

Blue lemonade is a homogenous mixture if it does not contain pulps that are visible. It is homogenous because only one component can be seen and the ingredients like sugar and lemon juice are already dissolved in the water.