Balance each of the following redox reactions and classify it as a combination, decomposition, or displacement reaction:
NaNO₃(s) → NaNO₂(s) + O₂(g)

Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.

From: www.middleschoolchemistry.com

Answer:

The answer is below

Explanation:

Certain countries like Germany under Adolf Hitler favored military solutions to the great depression because the government felt that having a mass production of military weapons and recruitment of unemployed people or citizens into the army would change the dire situation.

On the other hand, countries like the United States did not favor the military solutions but instead choose the NEW DEAL under Franklin D Roosevelt; the reason could be linked to their democratic culture, the isolation belief tendency.

Answer:

Atmosphere and Biosphere

Explanation:

Answer: the answer is 2400

Explanation: 10 x 20=200 x 12=2400

Answer:

22.4 L

Explanation:

Answer: membrane and cell wall

Explanation: this is because the cell wall is only known to happen in plant cells and a membrane is in both plant and animal cells so it is most likely membrane and cell wall.

Answer:

C

Explanation:

answer:Collisions between gas particlCollisions between gas particles or collisions with the vessel walls are perfectly elastic.

explanation:As long as an ideal gas is maintained at a constant temperature, the average kinetic energy of the molecules is said to be constant. In fact, what we call the temperature of a body at the macroscopic scale is just a representation of the kinetic energy carried by its atoms or molecules as they vibrate inside the body.

Now, if the kinetic energy of this oxygen gas is constant, it is because the collisions between the particles are assumed to be perfectly elastic. No energy is lost during the collisions. The rationale behind this assumption is that the particles are very tiny.

The answer which corresponds best to the explanation above is b. Collisions between gas particles are elastic; there is no net gain or loss of kinetic energy.

If you had used [OH ] of 0.030m and 0.040m instead of the concentrations you did use in the procedure, this means that you can not have identical Rate Law for two systems with different initial concentrations.

For the violet crystals, we use the abbreviation Vc

Vc + OH

According to the rate law:

Rate law = K × Cvc × Coh

In this reaction, we take violet crystals (Vc) as the limiting reactant

Cvc = initial Cvc × (1 - x)

Coh = initial Cvc × (1 - x)

Substitute the value in the initial equation:

Rate law = K × Cvc × Coh

Rate law = K × (Cvc 1)² × (1-x)²

By the equation, it is proved that rate law is a function of the reagent's initial concentration.

It proves that two systems having different initial concentrations does not follow identical rate law.

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The potential temperature is 15°C.

Given,The temperature of some air is minus 20 degrees C at 95 kPa of pressure.

Reference pressure at sea level = 101.3 kPa

The potential temperature (θ) is the temperature a parcel of dry air would have if it were adiabatically brought to a standard reference pressure, typically 1000 millibars (100 kPa).

Potential temperature is directly proportional to the absolute temperature and inversely proportional to the pressure in a system.

In order to find the potential temperature of the given air, we can use the formula below:

θ = T × (P0 / P)^(R/cp)

where,θ = potential temperature (in Kelvin)

T = temperature (in Kelvin)

P0 = reference pressure (in Pa)

P = actual pressure (in Pa)

R = gas constant for dry air (287 J/(kg·K))

cp = specific heat of dry air at constant pressure (1004 J/(kg·K))

Converting the given temperature in Celsius to Kelvin:

T = -20°C + 273.15K= 253.15K

The formula can be written as:

θ = T × (P0 / P)^(R/cp)θ

= 253.15 × (101300/95000)^(287/1004)θ

= 288.5 K

Converting the potential temperature from Kelvin to Celsius:

θ = 288.5 K - 273.15

= 15.35°C (to the nearest degree)'

= 15°C (rounded off to the nearest degree).

Therefore, the potential temperature is 15°C.

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Approximately 1.693 grams of calcium will be produced when 4.7 grams of calcium chloride are completely used up in the reaction.

To determine the grams of calcium produced, we need to calculate the molar ratio between calcium chloride (CaCl2) and calcium (Ca) in the balanced chemical equation for the reaction. The balanced equation is:

2Al + 3CaCl2 → 3Ca + 2AlCl3

From the balanced equation, we can see that for every 3 moles of calcium chloride, 3 moles of calcium are produced. We need to convert the given mass of calcium chloride (4.7 grams) to moles using its molar mass.The molar mass of CaCl2 is calculated by adding the atomic masses of calcium (Ca) and chlorine (Cl). The atomic mass of calcium is 40.08 g/mol, and the atomic mass of chlorine is 35.45 g/mol.

Molar mass of CaCl2 = (40.08 g/mol) + 2(35.45 g/mol) = 110.98 g/mol

Now we can calculate the moles of calcium chloride:

Moles of CaCl2 = (mass of CaCl2) / (molar mass of CaCl2)

              = 4.7 g / 110.98 g/mol

              ≈ 0.0423 mol

Since the molar ratio between calcium chloride and calcium is 3:3, the moles of calcium produced will be equal to the moles of calcium chloride used.

Moles of Ca = 0.0423 mol

To convert moles of calcium to grams, we multiply by the molar mass of calcium:

Mass of Ca = (moles of Ca) × (molar mass of Ca)

          = 0.0423 mol × 40.08 g/mol

          ≈ 1.693 g

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The equation that should be used to calculate the time required for a given initial concentration to decrease by 35% given the rate constant with units of I/Ml is ln(Α/Αo) = -kt (No correct answer).

To calculate the time required for a given initial concentration to decrease by 35% given the rate constant with units of 1/M·s, you should use the following equation ln(A/[Ao) = -kt. This equation comes from the first-order integrated rate law and relates the initial concentration (A0), the concentration at a given time (At), the rate constant (k), and the time (t). To solve for the time (t), follow these steps:

1. Determine the fraction of the initial concentration remaining: 1 - 0.35 = 0.65

2. Plug this fraction into the equation: ln(0.65) = -kt.

3. Divide both sides of the equation by -k: t = ln(0.65) / (-k)

4. Substitute the given rate constant (k) into the equation and solve for t.

Therefore, the correct answer is "In[Α/Αo] = -kt". (There is no correct option).

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Answer:

warm, dry downslope wind affecting Southern California - Santa Ana wind

a seasonally changing wind- monsoon

wind blowing from a valley up a mountain slope - valley breeze

generated by cold thunderstorm downdrafts - haboob

Explanation:

The Santa Ana wind occurs in early autumn. They bring hot and dry weather to areas around the South-West coast. They move at high speeds, affecting most parts of Southern California.

Monsoon is a seasonal wind that blows across Southern Asia. It usually blows in summer. It is a a seasonally changing wind.

Valley breeze is an example of convection current in nature. It is produced by rapid warming of the valley floor leading to the expansion of air making it to flow up the slopes. At night, radiation from the surface cools the slopes. This leads to the rise of cooler and denser air which drains into the valley.

Haboob is generated by cold thunderstorm downdrafts. It is associated with large sandstorms and dust storms.

Answer:

21 ..........................

Answer:

21 neutrons

Explanation:

using PV=mRT/Mr

V=(4.9×8.31×(273+20))/(24.3×101.5×10^3)

=4.84×10^-3 m^3

=4.84×10^6 mm^3

Answer:

d

Explanation:

radition

Answer:

D Radiation

Explanation:

Answer:

The answer is lemonade.

Weaker acids are those which tend to have a higher pH from 4 to at least 6 stronger acids have low pH from 2 and below that's from 2 to 0.

Hope this helps

Hope

Answer:

Since it has 2 valence electrons

Explanation:

Answer:

1 mole of any material contains 6.023×1023 elementary particles. Hence, by ratio and proportion, 5.61mol of diatomic hydrogen gas contains 5.61×6.023×1023 hydrogen molecules =3.3789×1024 H2 molecules.

Explanation:

The more stable secondary alkyl radical is easier to create, hence 2 chlorobutane is created quicker than 1 chlorobutane.

Chemical stability in chemistry refers to a chemical system's thermodynamic stability.

When a system is in its lowest energy state or in chemical equilibrium with its surroundings, thermodynamic stability occurs.

In this case, the primary alkyl halide is 1-chlorobutane, while the secondary halide is 2-chlorobutane.

As a result, the SN1 reaction will occur in the 2-chlorobutane more quickly than the 1-chlorobutane.

Since it is simpler to produce the more stable secondary alkyl radical, 2 chlorobutane is produced more quickly than 1 chlorobutane.

Thus, 2-chloro 2-methylbutane is more stable.

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Question:

Each liter of air has a mass of 1.80 grams. How many liters of air are contained in 2.5 x103) kg of air?

Answer:

11.48106 L

The major organic product of the reaction is that methoxide ion replace the bromide ion.

A nucleophilic substitution reaction occurs when an organic compound's leaving group, which is frequently composed of halide groups or other electron-withdrawing groups, interacts with a nucleophile.

The contact between the two species, the organic compound and the nucleophile, determines how quickly this reaction proceeds.

The nucleophile attacks the substrate from the rear in order for this reaction to continue. The angle of the nucleophile's approach to the supplied substrate with respect to the carbon-leaving group bond is 180. Through a transition state, the carbon-nucleophile bond forms and the carbon-leaving group bond dissolves simultaneously.

It operates through the \(SN_{2}\) mechanism and is an illustration of the nucleophilic replacement of primary alkyl bromide. It involves configuration inversion. Methoxide ion replaces bromide ion in this process.

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Answer:

A. 35

B. 7

C. halogênios

Explanation:

Aqui, para responder a essa pergunta, precisaremos conhecer o elemento particular em questão.

..... 4s ^ 2 3d ^ 10 4p ^ 5 significa que está a cinco elétrons da configuração eletrônica do último elemento na primeira camada dos metais pesados.

O último elemento da 1ª série do elemento de transição é o zinco, portanto, como está a apenas 5 elementos de distância, o átomo de que estamos falando é o átomo de Bromo de Bromo.

A. O zinco tem um número atômico 30 e como o bromo está a 5 elementos de distância, seu número atômico é 35

B. Uma vez que pertence ao grupo halogênio, tem 7 elétrons de valência como o resto da família

C. Pertence à família dos halogênios

Answer:

A and C

Explanation:

I think it's A and C but I could be wrong

1.2 moles of hydrogen

please see the attached picture

hope it helps

Good luck on your assignment

The first to dissolve is the solute in tank B. The amount of a substance that dissolves in a specific solvent concentration at a specific temperature is known as its solubility.

The introduction of a solute to a solvent is the first stage in the dissolving process. The molecules of these two substances begin to interact, causing the solute molecules to disperse and become encircled by solvent molecules.

In water, salt, sugar, and coffee all dissolve. They disintegrate quickly. They typically dissolve more rapidly and completely in hot or warm water. Even very hot water won't be able to dissolve sand or pepper.

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Answer: Down Below

Explanation:

this is true about the importance of an indicator

Valid: accurate measure of a behaviour, practice, task that is the expected output or outcome of the intervention

Reliable: consistently measurable over time, in the same way by different observers

Precise: operationally defined in clear terms

Measurable: quantifiable using available tools and methods

Timely: provides a measurement at time intervals relevant and appropriate in terms of programme goals and activities

Pro-grammatically important: linked to the programme or to achieving the programme objectives

The mass of Zr(s) plated out during this process is approximately 2.673 grams.

To determine the mass of Zr(s) plated out in this electrolytic cell, we need to use Faraday's laws of electrolysis, which relate the amount of substance produced or consumed in an electrolytic cell to the amount of electricity passed through the cell.

The first law states that the amount of substance produced or consumed at an electrode is directly proportional to the amount of electricity passed through the cell, which can be expressed as:

m = (Q * M) / (n * F)

where:

m is the mass of substance produced or consumed

Q is the electric charge passed through the cell, which is equal to the current (I) multiplied by the time (t): Q = I * t

M is the molar mass of the substance

n is the number of electrons transferred in the electrochemical reaction

F is the Faraday constant, which is equal to the charge on one mole of electrons, approximately 96485 C/mol.

In this case, \(Zr^{4+}\) is reduced to Zr(s) by the gain of 4 electrons, so n = 4. The molar mass of Zr is approximately 91.22 g/mol. Substituting the given values into the equation, we get:

m = (Q * M) / (n * F)

m = (4.98 A * 5.88 h * 3600 s/h * 91.22 g/mol) / (4 * 96485 C/mol)

m = 2.673 g

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Answer:

The water cycle, also known as the hydrologic cycle or the hydrological cycle, describes the continuous movement of water on, above and below the surface of the Earth. The mass of water on Earth remains fairly constant over time but the partitioning of the water into the major reservoirs of ice, fresh water, saline water and atmospheric water is variable depending on a wide range of climatic variables. The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor. Hope this helps, mark as brainliest please!

A body travels 10 meters during the first 5 seconds of its travel, and it travels a total of 30 meters over the first 10 seconds of its travel the average speed during the time from t = 5 seconds to t = 10 seconds is 4 meters/second.

Calculate the total distance travelled during that time period and divide it by the length of the interval to determine the average speed between t = 5 and t = 10 seconds.

The first five seconds' worth of distance is recorded as 10 metres, and the first ten seconds' worth of distance is given as 30 metres. As a result, the distance covered between t = 5 and t = 10 seconds can be estimated as follows:

Distance from t = 5 seconds to t = 10 seconds

                          = Total distance traveled in 10 seconds - Distance traveled in the first 5 seconds

Distance from t = 5 seconds to t = 10 seconds

                          = 30 meters - 10 meters

                          = 20 meters

The duration of the time interval from t = 5 seconds to t = 10 seconds is 10 seconds - 5 seconds

                                                                  = 5 seconds.

Average speed = Distance traveled / Duration

Average speed = 20 meters / 5 seconds = 4 meters/second

Thus, the correct option is c.

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There is a way to decrease the concentration of an ion here. The carbonate ion happens to be easy to decrease. All we have to do is add some acid (say HCl) to the container. The following sequence of reactions explains how this WO r ks.

As long as more acid is added, this process will continue until all the solid Zn CO3 has been dissolved