What is the air temperature 8,850 m in the air?

The mass, in grams, of oxygen that will be produced from the reaction to two significant figures, will be 0.17 grams.

Mercury oxide decomposes to liquid mercury and oxygen gas. The equation for the decomposition reaction is represented below:

\(2HgO + heat --- > 2Hg + O_2\)

Mole of 2.25 g mercury oxide = mass/ molar mass

                = 2.25/216.59

                       = 0.0104 moles

Mole ratio of mercury oxide that decomposes and oxygen gas produced = 2:1.

Equivalent moles of oxygen gas produced = 0.0104/2

                                 = 0.0052 moles

Mass of 0.0052 moles oxygen gas = mole x molar mass

                                 = 0.0052 x 32

                                         = 0.1664 grams

To 2 significant figures, the amount of oxygen gas produced is 0.17 grams.

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Answer:

please add answers

Explanation:

The affect of radiation on healthy cells can be reduced when treating cancer by focusing the radiation on the cancerous cells.

These side effects are also known as late side effects, which causes the human healthy cells after some time. The Doctors try to protect the healthy human cells by lowering the power of the radiations as possible. The radiation dose is balanced between being high enough to kill cancer cells, yet low enough to limit damage to healthy cells. If we use the advancement of technology of dose conformity such as IMRT, SBRT, and IGRT, then we can get rid of such dangerous radiations.

So we can conclude that the affect of radiation on healthy cells can be reduced when treating cancer by focusing the radiation on the cancerous cells.

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Lead levels in plankton and algae are high, mostly as a result of environmental pollution brought on by human activity. While it is true that some brown algae species have the ability to accumulate heavy metals like lead.

Plankton and algae have high levels of lead, mostly as a result of environmental contamination brought on by human activities including mining, industrial operations, and the burning of fossil fuels.

Due to the fact that plankton and algae take up trace quantities of lead from the surrounding water, their tissues contain greater concentrations of the metal.

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Answer:

1: Na

Explanation:

Out of the four elements, the most reactive element is sodium (Na).

Sodium is a highly reactive metal because it has only one valence electron in its outermost shell, which is relatively far from the positively charged nucleus. This makes it easy for sodium to lose its outermost electron and form a positively charged ion, which is why it readily reacts with other elements.

Aluminum (Al), rubidium (Rb), and indium (In) are also reactive metals, but they are less reactive than sodium.

Mg + CO\(_2\)→ MgO + CO is an oxidation-reduction reaction. Therefore, the correct option is option E among all the given options.

Redox reactions involve oxidation-reduction chemical processes in which the oxidation states of the reactants change. Redox is a shortened version of reduction-oxidation. Two distinct processes—a reduction process or an oxidation process—can be used to describe all redox reactions.

In redox and oxidation-reduction processes, the oxidation or reduction reactions usually take place concurrently. In a chemical reaction, the material that is being reduced is referred to as the reducing agent, and the substance that is being oxidised is the oxidising agent. Mg + CO\(_2\)→ MgO + CO is an oxidation-reduction reaction.

Therefore, the correct option is option E.

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Answer:Not sure what exactly you are asking but here are the 5 types of reactions

Explanation:

1) synthesis(combination, or composition old name)  You add all reactants together to form 1 compound

A+ B--> AB

2) decompostion-  Start with one reactant and it breaks down to 2 or more products

ABC--> AB + C

3) single replacement or sometimes called single displacement

You have one single element on both the reactant and product side

AB + C --> CB + A (positive charges trade places)

( this one is tricky because somtimes the element is a negative charge and if it is negative than it looks like this)

AB + C --> AC + B (negative charges trade places)

4) double replacement or double displacement

start with 2 compounds and produce 2 new compounds.  I tell my students that the positive charges trade places

AB + CD  ---> AD + CB

5) Complete combustions

hydrocarbon + oxygen --> Carbon dioxide + water

CH4 + O2--> CO2 + H20

to balnace it

CH4 + 2O2--> CO2 + 2 H2O

Answer:

a.

Explanation:

One double bond.

For example ethene CH2=CH2

Diffusion and convection are two distinct processes that play a role in the dispersal of air pollution, but they differ in how they transport pollutants and their impact on dispersion.

Diffusion refers to the spontaneous movement of particles from an area of higher concentration to an area of lower concentration. It occurs due to random thermal motion of molecules. In the context of air pollution, diffusion allows pollutants to spread out gradually, dispersing them in various directions. However, diffusion alone is a relatively slow process, particularly for large-scale dispersion, and it may not be effective in rapidly distributing pollutants over long distances.

Convection, on the other hand, involves the transfer of heat energy through the movement of a fluid, such as air or water. In the atmosphere, convection occurs as warm air rises, creating upward currents and transporting pollutants vertically. As the air rises, it carries pollutants to higher altitudes, which can lead to their dispersion over larger areas. Convection is a more efficient process for the vertical transport and dispersion of pollutants compared to diffusion.

The impact of diffusion and convection on the dispersal of air pollution can vary. Diffusion primarily affects local dispersion, allowing pollutants to spread out in the immediate vicinity of emission sources. It is more significant in areas with minimal air movement. Convection, on the other hand, can facilitate the long-range transport of pollutants, particularly when large-scale weather systems are involved. Convection can carry pollutants over greater distances and contribute to regional or even global dispersion, depending on weather patterns.

In summary, diffusion and convection are both involved in the dispersal of air pollution, but they differ in the mechanisms of transport and the scale of dispersion. Diffusion leads to gradual spreading of pollutants locally, while convection enables vertical transport and dispersion over larger areas, including long-range transport depending on weather conditions. Understanding the interplay between these processes is crucial for assessing the extent and impact of air pollution.

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3. Convection Current

But just a tip Next time try to emphasize the question a little more ! Hope this helps :)

Answer

D) anhydrous base.

Explanation

Solid sodium hydroxide (NaOH) is an example of an anhydrous base.

A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH⁻) ions in an aqueous solution.

A substance is anhydrous if it contains no water.

Answer:

SiO2

Explanation:

A covalent network solid is a solid substance held together by a network of covalent bonds. Silicon dioxide forms a three dimensional covalent network solid structure.

Silicon dioxide is comprised of a network in which each silicon atom is at the centre of a tetrahedron of four oxygen atoms. Each of the oxygen atoms is also bonded to another silicon atom, at the centre of its own tetrahedron of oxygen atoms. This gives rise to a crystalline solid structure which is hard, having a high melting point.

Answer:

D

Explanation:

Answer:

c

Explanation:

for best accadimes

The change in enthalpy when 90.6 g of steam at 100◦C is converted to liquid water at the same temperature and pressure is 204.7 KJ

First, we shall obtain the number of mole water converted to steam. details below:

Mole = mass / molar mass

Mole of water = 90.6 / 18

Mole of water = 5.03 moles

Finally, we shall determine the change in enthalpy. Details below:

ΔH = n × ΔHv

ΔH = 5.03 × 40.7

ΔH = 204.7 KJ

Thus,  we can conclude that the change in enthalpy is 204.7 KJ

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Answer:

copper sulphate reacts with sodium hrydroxide to form a blue preipitate of copper hrydroxide and soduim hrydroxide.

Answer:

One molecule

Explanation

But there is three different atoms forming this one NaOH. The three atoms are Na, O and H, that is one sodium, one oxygen, and one hydrogen.

The moles of NaOH used is 0.0008 moles

The molarity of the acid  is 0.008 M

The molarity of the acid is found as follows:

Moles of NaOH used = concentration of NaOH × volume of NaOH used

the average volume of NaOH used = 8.0 mL

moles of NaOH = 0.1 M × 8.0 mL

moles of NaOH = 0.0008 moles

Molarity of acid:

Assuming the acid is monobasic, the mole ratio of acid to base is 1 : 1

The volume of acid used is 100 mL

The molarity of acid = moles of acid / volume of acid in liters

The molarity of acid = 0.0008 moles / 0.1 L

The molarity of acid  = 0.008 M

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Answer:

because it is

Answer:

7.5 g

Explanation:

There is some info missing. I think this is the original question.

Ammonium phosphate ((NH₄)₃PO₄) is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid (H₃PO₄) with ammonia (NH₃). What mass of ammonium phosphate is produced by the reaction of 4.9 g of phosphoric acid? Be sure your answer has the correct number of significant digits.

Step 1: Write the balanced equation

H₃PO₄ + 3 NH₃ ⇒ (NH₄)₃PO₄

Step 2: Calculate the moles corresponding to 4.9 g of phosphoric acid

The molar mass of phosphoric acid is 98.00 g/mol.

\(4.9 g \times \frac{1mol}{98.00g} = 0.050mol\)

Step 3: Calculate the moles of ammonium phosphate produced from 0.050 moles of phosphoric acid

The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.050 mol = 0.050 mol.

Step 4: Calculate the mass corresponding to 0.050 moles of ammonium phosphate

The molar mass of ammonium phosphate is 149.09 g/mol.

\(0.050mol \times \frac{149.09 g}{mol} = 7.5 g\)

Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

The electrode potential value is 59mV

Temperature=298k

What is electrode potential?

equation formed- Zn → Zn2+ + 2e

              from Nernst equation-

E=E cell - 0.059 log [Zn2+]

[zn2+]=3.481 mol/lit

hence, Molar concentration of Zn2+ions in a solution is 3.481 mol/lit

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Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

Exothermic reaction.

Explanation:

Since the products end up having a lower energy than the reactants, that means that the reaction is exothermic. It also means that this reaction released energy.

Answer:

2.9 psi

Explanation:

Pressure (mmHg) = 150 mmHg

Pressure (psi) =?

The pressure in pound per square inch (psi) can be obtained as follow:

51.715 mmHg = 1 psi

Therefore,

150 mmHg = 150 mmHg × 1 psi / 51.715 mmHg

150 mmHg = 2.9 psi

Thus, pressure in pound per square inch (psi) is 2.9 psi.

Answer:

1.67

Explanation:

Mass÷mr=moles

3÷18=1.67

Answer:

39.7%

Explanation:

The balanced chemical equation for the reaction is:

3CuO + 2NH3 → 3Cu + N2 + 3H2O

First, we need to calculate the theoretical yield of N2:

Molar mass of CuO = 79.55 g/mol

Molar mass of NH3 = 17.03 g/mol

Molar mass of N2 = 28.02 g/mol

Number of moles of CuO = 68.8 g / 79.55 g/mol = 0.865 mol

Number of moles of NH3 = 45.9 g / 17.03 g/mol = 2.695 mol

From the balanced equation, 3 moles of CuO react with 2 moles of NH3 to produce 1 mole of N2. Therefore, the number of moles of N2 produced should be:

(1 mol N2 / 3 mol CuO) x (0.865 mol CuO) x (2 mol NH3 / 3 mol CuO) = 0.383 mol N2

The theoretical yield of N2 is:

Theoretical yield = 0.383 mol x 28.02 g/mol = 10.73 g

The percent yield is:

Percent yield = (Actual yield / Theoretical yield) x 100%

Percent yield = (4.25 g / 10.73 g) x 100%

Percent yield = 39.7%

Therefore, the percent yield of the experiment is 39.7%.

Hope this helps!

The plum-pudding model suggested a uniform distribution of electrons within a positively charged atom, whereas the Bohr atomic model introduced the concept of quantized energy levels and specific orbits for electrons.

The Bohr atomic model and the plum-pudding model are two distinct models that were proposed to explain the structure of atoms, and they differ in their fundamental concepts.

The plum-pudding model, also known as the Thomson model, was proposed by J.J. Thomson in 1904. According to this model, an atom consists of a positively charged sphere (the "pudding") with embedded negatively charged electrons (the "plums").

In other words, the electrons were thought to be uniformly distributed throughout the positively charged atom. This model suggested that the atom was overall neutral and did not contain any distinct substructures.

On the other hand, the Bohr atomic model, proposed by Niels Bohr in 1913, introduced the concept of quantized energy levels within an atom. According to this model, electrons orbit the nucleus in specific, discrete energy levels or shells.

These energy levels are represented by fixed orbits or paths, with electrons occupying only certain allowed orbits. The model also introduced the idea that electrons can transition between energy levels by emitting or absorbing energy in discrete packets called photons. This model explained phenomena like atomic spectra and the stability of atoms.

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