what is the net ionic equation for the reaction between sodium chloride and mercury (i) nitrate? 2nacl(aq) hg2(no3)2(aq) → nano3(aq) hg2cl2(s)

Answer:

A because density DOES have a unit

Explanation:

The given statement is " an endothermic reaction transfers energy to the surroundings" is false.

The Endothermic reactions and the Exothermic reactions are the types of the reactions based on the heat exchanges. In the Endothermic reactions, the heat energy is absorbed by the substances that is reacting and from the surroundings. The Endothermic reactions are the chemical reactions in which the reactants will be absorb the heat energy from the surroundings to form the products.

In the Exothermic reactions, the heat energy is transferred by the  substances that is reacting to the surroundings. Therefore the this is false that the endothermic reaction transfers the energy to the surroundings.

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a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer: D. the number of protons

Explanation: The number of protons shows you what the Atomic number of an element is on the Periodic table of elements.

The identity of an element is primarily determined by the number of protons it possesses. The Option C.

Each element on the periodic table has a unique number of protons in its nucleus which is referred to as its atomic number. This fundamental property of an element distinguishes it from other elements and determines its place on the periodic table.

While number of neutrons and electrons can vary within an element, it is the number of protons that defines its identity. Thus, the correct answer is C: the number of protons.

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Answer:

NiC2N2

Explanation:

Answer:

Sulphate ion

Explanation:

Zinc will undergoes oxidation. Zn2+ - - > Zn + 2e-

Copper will undergoes reduction. Cu2+ + 2e- - - > Cu

The mass of the magnetic oxide of iron (Fe3O4) that can be produced from 48.0 g of pure iron and an excess of oxygen is 68.72 g.

The formation of the magnetic oxide of iron (Fe3O4) is described by the balanced equation:

4Fe + 3O2 → 2Fe2O3

According to the equation, four moles of iron (Fe) react with three moles of oxygen (O2) to produce two moles of Fe2O3.

To determine the amount of Fe2O3 produced from a given amount of Fe, we can follow these steps:

1. Calculate the number of moles of Fe that react:

The mass of pure iron (Fe) as 48.0 g, we can convert it to moles:

48.0 g Fe / 55.85 g/mol = 0.859 mol Fe

2. Use the balanced equation the number of moles of Fe2O3 produced:

The balanced equation, we know that 4 moles of Fe produce 2 moles of Fe2O3.

So, we can calculate:

1 mol Fe2O3 = 4/2 = 2 mol Fe

0.859 mol Fe produces 0.859/2 = 0.43 mol Fe2O3

3. Calculate the mass of Fe2O3 produced:

Using the number of moles of Fe2O3 obtained above and the molar mass of Fe2O3 (159.69 g/mol):

Mass of Fe2O3 = 0.43 mol Fe2O3 × 159.69 g/mol = 68.72 g

The mass of the magnetic oxide of iron (Fe3O4) that can be produced from 48.0 g of pure iron and an excess of oxygen is 68.72 g.

This calculation is based on the stoichiometry of the balanced equation and provides an estimation of the expected yield of Fe3O4.

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Answer:

The following relationship makes this possible: 1 mole of any gas at standard temperature and pressure (273 K and 1 atm) occupies a volume of 22.4 L.

Explanation:

1 mole of any gas would occupy 22.4L of gas at standard temperature and pressure (STP) i.e at 273K and 1 atm.

The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P V = n R T

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The energy of a wave with a wavelength of 7.3E-9 m is 2.72 x 10^-17 Joules.

The wavelength is described as the spatial period of a periodic wave the distance over which the wave's shape repeats.

To calculate the energy, we use the Planck's equation

E = h x c / λ

substitute the values of the given parameters, we have

Planck's constant in joules (h = 6.6261 × 10⁻³⁴ J⋅s),

speed of light (c = 299792458 m/s).

λ  =  7.3E-9 m

Energy =  6.6261 × 10⁻³⁴ x  (299792458/   7.3E-9 m)

Energy = 2.72 x 10^-17 Joules.

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Answer:

Which could cause topsoil to be lost?

a) wind and water erosion

Explanation:

A natural and common cause of soil erosion is Water. Water can carry away tiny soil particles.

Raindrops can impact the soil surface and can break down the aggregates in soil and scatter them.

Water runoff is another cause of soil erosion and this occurs when water on a slope isn’t absorbed into the soil or becomes trapped on the surface.

Loose particles can be picked up and carried away by the wind.

Soil surfaces can be worn down when struck by airborne particles carried by the wind.

B. Lack of use of the top soil rather helps the top soil to regain its nutrients.

c. Compaction can the topsoil from losing particles, since there are no loose particles to be picked up.

D. Desertification mostly causes the soil to lose its nutrients, not go away completely.

Hope this helps!

Answer:

The correct answer is A

Explanation:

Answer:

1 chlorine and 2 hydrogen

Explanation:

because in the picture you already have a hint wichbis chlorine so that eliminiates C and D

and its 2 hydrogens because if it were 1 then there wouldn't be anything adding in the chemical equation

The limiting reactant is the answer. The limiting reactant is the reactant that is completely used up in the reaction and limits how much product can be formed.

What is reactant?
A reagent, also known as an analytical reagent, is a substance as well as compound that is added to a system in chemistry to either initiate a chemical reaction or determine whether one has already taken place. [1] Although the terms reactant as well as reagent are frequently used interchangeably, reactant refers to a substance that is consumed during a chemical reaction. Despite being part of the reaction mechanism, solvents are not typically referred to as reactants. Catalysts are not reactants because they are not used up in the reaction. The reactants in biochemistry are frequently referred to as substrates, particularly when enzymes are involved in the reaction.

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Answer:

Three formula units, Two Ammonium radical and Sulphate radical

Explanation:

\({}\)

The molarity of the first solution is 0.1698 M, and the molarity of the second solution is 0.291 M.

To calculate the molarity of a solution, we use the formula:

Molarity (M) = moles of solute / liters of solution

Let's calculate the molarity for each solution step-by-step:

1. First solution:
Given: moles of NaOH = 0.450 mol
Volume of solution = 2.65 L

Using the formula, we have:
Molarity = 0.450 mol / 2.65 L
Molarity = 0.1698 M

Therefore, the molarity of the first solution is 0.1698 M.

2. Second solution:
Given: mass of NaCl = 13.9 g
Volume of solution = 817 mL = 0.817 L (convert mL to L)

First, we need to convert mass of NaCl to moles:
Moles = mass / molar mass
Molar mass of NaCl = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol (Na = 22.99 g/mol, Cl = 35.45 g/mol)
Moles = 13.9 g / 58.44 g/mol
Moles = 0.238 mol

Now, we can calculate the molarity using the formula:
Molarity = 0.238 mol / 0.817 L
Molarity = 0.291 M

Therefore, the molarity of the second solution is 0.291 M.

In summary, the molarity of the first solution is 0.1698 M, and the molarity of the second solution is 0.291 M.

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Answer:

Tin (IV) Nitrate

General Formulas and Concepts:

Chem

Explanation:

Sn has 2 general forms in charges: Sn²⁺ and Sn⁴⁺ as it is a Post-Transition metal.

Nitrate, NO₃⁻, has a 1 minus charge.

To balance out these charges from the given compound, we know that there are going to be 4 nitrates to balance out a charge. +4 and -4 equals 0, so the charge of Sn would be +4.

Therefore, our compound name would be Metal (Oxidation Number) polyatomic ion:

Tin (IV) Nitrate

Answer:

1. thermometer

2. thermal energy

3. specific heat

4. temperature

5. Celsius

6. heat

7. mass

Taking into account the reaction stoichiometry, 124 grams of Na₂O are required to produce 160 grams of NaOH.

In first place, the balanced reaction is:

Na₂O + H₂O → 2 NaOH

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:

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

The following rule of three can be applied: if by reaction stoichiometry 80 grams of NaOH are produced by 62 grams of Na₂O, 160 grams of NaOH are produced by how much mass of Na₂O?

mass of Na₂O= (160 grams of NaOH× 62 grams of Na₂O)÷ 80 grams of NaOH

mass of Na₂O= 124 grams

Finally, 124 grams of Na₂O are required.

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Answer:

Two Helium atoms

If two carbon atoms underwent fusion (of 600 million kelvin) you would get two helium atoms.

Answer:

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large

deposit of dust that contained substances only found in asteroids, What most likely killed off the dinosaurs?

Explanation:

Answer:

b

Explanation:

Answer:

Density, \(d=2.09\ g/cm^3\)

Explanation:

Given that,

Mass of a flask is 450 g

Volume of benzene added to the flask is 145 mL or 145 cm³

The weight of the flask and benzene is found to be 754 g.

We need to find the density of the benzene.

Weight of benzene added = total weight of flask and benzene-mass of flask

m = 754 g - 450 g

m = 304 g

Density = mass/volume

So,

\(d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3\)

So, the density of the benzene is \(2.09\ g/cm^3\).

Answer:

c

Explanation:

the mitochodria is the protien power house of the cell

When we rank the measurement from smallest to largest we will get: smallest = 0.004 x 10-4 m and Largest = 1 m

We will, first of all, have to rewrite these numbers so that they have common-like powers of 10.

1.0 x 10-4 m

2 x 10-5 m = 0.2 x 10-4 m

3 x 10-6 m = 0.03 x 10-4 m

3 x 10-6km = 3 x 10-6 x 103 m = 3 x 10-3 m = 30 x 10-4 m

4 x 102 x 10-3 m = 4 x 10-1 m = 0.004 x 10-4 m

0 m

1 m

We understand the principles for moving decimal points when multiplying by a negative power of ten, as well as the procedures for converting centimeters to meters (divide by 0.01). We will acquire that when we complete all of the conversions and sort these responses, which will then be in terms of m.

List these bolded equivalent values from least to greatest.  

smallest = 0.004 x 10-4 m

Largest = 1 m

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The temperature of the gas sample will be approximately 618.6 K when the volume changes to 333 ml and the pressure is increased to 2.58 atm

To solve this problem, we can use the combined gas law, which relates the initial and final conditions of a gas sample:

(P1 * V1) / (T1) = (P2 * V2) / (T2)

Where:

P1 and P2 are the initial and final pressures, respectively.

V1 and V2 are the initial and final volumes, respectively.

T1 and T2 are the initial and final temperatures, respectively.

Let's plug in the given values into the equation:

(1.40 atm * 245 ml) / (308 K) = (2.58 atm * 333 ml) / (T2)

Now we can solve for T2:

T2 = (2.58 atm * 333 ml * 308 K) / (1.40 atm * 245 ml)

T2 ≈ 618.6 K

Therefore, the temperature of the gas sample will be approximately 618.6 K when the volume changes to 333 ml and the pressure is increased to 2.58 atm.

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The main component in a cement slab in a house is typically Portland cement.

Key points:

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When reactants are added to a chemical reaction in solution or the gas phase at equilibrium, Q decreases  and equilibrium shifts to produce more reactant.

Equilibrium is the state of balance , the state when the rate of forward reaction is equal to the rate of backward reaction. When we add reactant to a chemical reaction equilibrium shifts to the rights side means from product side to produced more reactant. when we add product reaction will shifts to the left side that is in the reactant side.

Thus, When reactants are added to a chemical reaction in solution or the gas phase at equilibrium, Q decreases  and equilibrium shift to produce more reactant.

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C²H⁴ + 3O² --> 2CO² + 2H²O

The balanced equation for the complete oxidation reaction that occurs when ethylene (C2H4) burns in air is: C2H4 + 3 O2 → 2 CO2 + 2 H2O. In this balanced equation, one molecule of ethylene reacts with three molecules of oxygen to produce two molecules of carbon dioxide and two molecules of water. The coefficients are the smallest possible integers for this reaction.

This reaction shows that when ethylene is burned in the presence of oxygen, it reacts to produce carbon dioxide (CO2) and water (H2O) as the products. The coefficients are the smallest possible integers, as required. This reaction releases a large amount of energy in the form of heat and light, which makes ethylene a very combustible gas. The complete oxidation of ethylene is an exothermic reaction, meaning it releases heat. The reaction is also highly exergonic, meaning that it releases energy that can be harnessed to do useful work. In summary, the balanced equation for the complete oxidation of ethylene is C2H4 + 3 O2 → 2 CO2 + 2 H2O. This reaction releases energy in the form of heat and light and is highly exergonic.

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creo que es fermentacion

Answer:

Es Fermentación

The average molar bond enthalpy of the carbon-chlorine (C-Cl) bond in a \(CCl_4\) molecule can be calculated by comparing the bond dissociation energies of multiple C-Cl bonds in different compounds and taking the average.

Here are the approximate bond dissociation energies for the C-Cl bond in a few compounds:

\(CH_3Cl\): 339 kJ/mol

To calculate the average, add up the bond dissociation energies and divide by the number of data points:

(339 + 328 + 323 + 330) kJ/mol = 1320 kJ/mol

Average molar bond enthalpy of C-Cl bond in \(CCl_4\)= 1320 kJ/mol

Please note that these values are approximate and can vary depending on the specific experimental conditions and compounds used.

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Earthquakes that occur as a result of collisions along oceanic and continental convergent boundaries are most likely to occur in subduction zones.

A subduction zone is a region where one tectonic plate is forced beneath another plate, which can result in earthquakes as the plates interact and slide past each other. Along subduction zones, the denser oceanic plate is forced beneath the less dense continental plate, leading to intense pressure and friction that can trigger earthquakes.

Some examples of subduction zones include the Cascadia Subduction Zone off the coast of the Pacific Northwest in North America, and the Ring of Fire in the Pacific Ocean, which is a major area of seismic activity and volcanic eruptions.