Please I need help with this question.​

Answer:

Molecules in both the metal and the surrounding air will start moving at higher speeds.

Explanation:

Temperature is defined as a measure of the average kinetic energy of the molecules of a body.

The greater the temperature of a body, the greater the average kinetic energy of the molecules of the body and the greater the speed of the particles of the body.

A metal at 150°C will witness an increase in the average kinetic energy of its molecules, the molecules will speed up as temperature increases.

Similarly, the hot metal plate releases heat to the surrounding air molecules by radiation causing the surrounding air molecules to experience an increase in temperature and average kinetic energy. Thus the air molecules surrounding the metal hot plate also speed up.

Answer:

Explanation:

Concentration of Hg⁺² = 7.36 x 10⁻⁴ M

Concentration of Al⁺³ = 1.05 M

2Al + 3Hg⁺² = 2Al⁺³ + 3Hg .

E = E₀ + RT / nF ln [ Al⁺³]² / [ Hg⁺² ]³

E₀ = reduction potential of  Hg⁺² minus reduction potential of  Al⁺³

= 0.92 V - ( - 1.66 V )

= 2.58 V

E = 2.58  + .059 /n  log  [ Al⁺³]² / [ Hg⁺² ]³

n = 6 , [Al⁺³] = 1.05 M ; [Hg⁺²] = 7.36 x 10⁻⁴ M

E = 2.58  + .059 /6  log  [ 1.05]² / [ 7.36 x 10⁻⁴ ]³

= 2.58  + .059 /6  log  27.65 x 10⁸ .

= 2.58  + .059 /6  [8+ log  27.65 ].

= 2.58  + .059 /6  [8+ log  27.65 ].

= 2.58  + .09

= 2.67 V .

Answer:

Explanation:

Combustion.  Have fun with that.

Answer:

the answer is false and the reason why is because every 29 days it completes one full cycle

Explanation:

Answer:

Because there is some element which is already in an octet state and has no need to achieve it, they have a full electron in their outermost shells such as helium, argon etc.

Answer

I'm pretty sure it would be (Insects, and microorganisms)

Explanation:

If its not correct I'm sry

Answer:

it would be Insects, and microorganisms

Explanation:

I finished the quiz minute ago

Answer:

1. mAl₂O₃ = 6.42 g

2. O₂

3. Al.

4. mAl = 1.67 g

Explanation:

Let's calculate the moles of Al and O2 first before doing any other calculations. The molecular weights of Al and O are 26.98 g/mol and 16 g/mol, so the moles are:

moles = mass / Atomic weight or molar mass

moles Al = 4.2 / 26.98 = 0.156 moles

moles O2 = 3 / (2*16) = 0.094 moles

The molar mass of Al2O3 is:

MM = (2 * 26.98) + (3*16) = 101.96 g/mol

With these data, let's determine each part:

1, 2 and 3. Grams of Al2O3, limiting and excess reactant:

To do this, we need to know which is the limiting reactant. this reactant will tell us how many moles are produced of Al2O3 and then, with the previously calculated molar mass, we can determine its mass. Let's see again the overall reaction taking place:

4Al + 3O₂ ---------> 2Al₂O₃

According to this reaction, 4 moles of Al reacts with 3 moles of oxygen, so:

If:            4 moles Al ---------> 3 moles O₂

Then:      0.156 moles ----------> X

X = 0.156 * 3/4 = 0.117 moles of O₂ required.

However, we do not have 0.117 moles of O₂, we have 0.094 moles, therefore we can conclude that the oxygen is the limiting reactant and Aluminum is the excess reactant.

Now, the moles produced of Al₂O₃ will be:

3 moles O₂ -------> 2 moles Al₂O₃

0.094 moles -------> Y

Y = 0.094 * 2/3 = 0.063 moles of Al₂O₃

Finally the mass would be:

mAl₂O₃ = 0.063 * 101.96

4. mass of excess reactant:

The mass of excess reactant would be:

moles Al = 0.156 - 0.094 = 0.062 moles

mAl = 0.062 * 26.98

Hope this helps

Some examples of molecules that are antigenic may be proteins and or polysaccharides in the cell wall of pathogenic bacteria which may be targeted by the immune system during the production of antibodies.

The relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the fact that antigens are biomolecules in the pathogens that can be targeted to bond antibodies that are produced by the organism in immune responses against bacteria, viruses, and allergens in the air and foods, etc.

Therefore, with this data, we can see that antigen molecules be any type of biomolecule present in the pathogen and the relationship between antigens in pathogenic bacteria and antibodies of the immune system is based on the binding between them (antigens and antibodies) which is fundamental during certain specific immune responses.

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Answer:

C

Explanation:

Answer:

C

Explanation:

The specific place where an organism lives is called its habitat.

Answer:mmhm

Explanation:

mhhm

Answer:

do u want the answer now?

Answer:

Various methods can be used for cracking, eg catalytic cracking and steam cracking: Catalytic cracking uses a temperature of approximately 550°C and a catalyst known as a zeolite which contains aluminium oxide and silicon oxide. Steam cracking uses a higher temperature of over 800°C and no catalyst.

Answer:

D seçeneği doğru

Explanation:

Türkiye'de kırmızı pandalar tehlike altında. Pandaların neslinin tükenmesinin ana nedenleri:

a) Habitat tahribatı

b) Genetik varyasyon kaybı, dolayısıyla onları hayatta kalmak için daha az uygun hale getirir

Bu nedenle, D seçeneği doğrudur

Answer:

0.017 mole of Pb(NO₃)₂.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2KOH + Pb(NO₃)₂ —> 2KNO₃ + Pb(OH)₂

From the balanced equation above,

1 mole of Pb(NO₃)₂ reacted to produce 2 moles of KNO₃.

Finally, we shall determine the number of mole of Pb(NO₃)₂ required to produce 0.034 mole of KNO₃. This can be obtained as follow:

From the balanced equation above,

1 mole of Pb(NO₃)₂ reacted to produce 2 moles of KNO₃.

Therefore, Xmol of Pb(NO₃)₂ will react to produce 0.034 mole of KNO₃ i.e

Xmol of Pb(NO₃)₂ = 0.034 / 2

Xmol of Pb(NO₃)₂ = 0.017 mole.

Thus, 0.017 mole of Pb(NO₃)₂ is needed for the reaction.

Answer:

She should expect for the scale to say 145 grams.

Explanation:

Limestone is mostly made up of the mineral calcium carbonate (CaCO3). But if you add an acid, you add hydrogen ions (H+), which will react with the carbonate to form hydrogen carbonate HCO3- ions, which are very soluble in water, and the limestone will dissolve. So, if you add 100+45 you get 145.

Mass percent of a compound=(mass of element in molecule/total mass of compound)×100  (a) 63.64%

We use the concept of mass percentage composition to explain the concentration of an element in a compound or a component in a combination. This word refers to the overall percent by mass of each element present in a compound.

In chemistry, a compound's percent composition is calculated by dividing its total amount of each elements by the compound's total amount, multiplied by 100. The following formula determines an element's percentage composition:

(gE/gT) = %CE 100

Here, %CE stands for the element's composition in percent.

How to calculate the percentage of each element by mass makes up each compound?

To get the mass percent of an element in a compound, multiply the result by 100 after dividing the mass of the element in 1 mole of the compound by the compound's molar mass.

Calculating total mass of HNO3

= 1 x 1 + 14 x 1 + 16 x 3

= 1 + 14 + 48

= 63

Calculating the mass percentage of Nitrogen in HNO3

= 1/63 x 100

= 1.586 %

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Answer:

B. Heat the solution, dissolve the solute, and let the solution cool verifying nothing settled out.

Explanation:

To dissolve more solute, the solution has been heated at a high temperature, and the cooling has been observed to verify proper dissolution.

The solubility of the compound has been the ability of the solvent to dissolve the solute molecules.  For the solution formation, the intermolecular forces between the solute molecules have been broken in order to sustain the interaction between the solute and the solvent molecules,

The interaction between solute and solvent molecules results in the dissolution of the solute in the solvent.

When Gunther dissolves the 34 grams, of solute, the energy of the solvent molecules has been enough to break the solute interactions and dissolve the solute molecules.

However, in order to dissolve more molecules, the solvent molecules are provided with the energy that has been able to increase the kinetic energy of the solvent for the dissolution of more solute.

The kinetic energy of the solvent has been increased with the increase in the temperature, thereby adding to the more dissolution of the solute.

Thus, to dissolve more solute in the solvent, the solution has been heated at a high temperature, and the cooling has been observed to verify the absence of precipitate thereby proper dissolution.

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Answer:

Q1) Distillation relies on evaporation to purify water

Explanation:

contaminated water is heated to form steam. inorganic compounds and large non-volatile organic molecules do not evaporate with the water and are left behind. The steam then cools and condenses to form purified water

Based on the formula to determine the freezing point depression of the solvent, the freezing point of the solution is 263.85 K.

The freezing point of a substance is the temperature at which the liquid changes to solid without any further decrease in temperature occurring during the process.

The addition of solute substances in liquids usually lowers the freezing point of the liquid solvent.

The formula to determine the freezing point depression of solvent is given below:

where'

The molality of the given solution = moles of solute/kg of solvent

moles of solute = 46/92

mass of solvent = 100 g or 0.1 kg

Molality of solution = (46/92) / 0.1

Molality of solution = 5

for glycerine, i = 1

ΔT = ΔT = 1 * 1.86 * 5

ΔT = 9.3

The freezing point of the solution = 273.15 - 9.3

The freezing point of the solution = 263.85 K

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Answer:

K3[Al(C2O4)3] is the answer

in the image there is answer okk

Answer:

i think mix im um 1s 6f 4d is correct answer

Explanation:

I)reaction between potassium paramagnet with H2 forms MnO2

Answer:

I believe its all above  

Explanation:

Fire on grasslands keep the tress from overtaking the grasses on fire. They can thereby preserve biodiversity. Fire on grassland helps contains coarse grass only. Therefore, all of the above is correct.

The addition of nutrients to the soil, the facilitation of easier grazing by herd animals, and the inhibition of the establishment of invasive plant species all contribute to the health and sustainability of grasslands.

The grassland ecology benefits from the natural occurrence of fire since it keeps it strong and healthy. It increases the soil's temperature and lessens the annual buildup of leaf litter, allowing sunshine to enter.

Warming the soil stimulates microbial activity, which liberates nutrients from decomposing plant matter that are essential for the growth of new grasses and flowers. All the given points are in direct or indirect way help the grassland.

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According to the ideal gas law, 4.30 molecule of o2 occupies 0.11 m³ at 99.7 kPa with 35.0 °C.

The relationship between a gas's pressure P, volumes V, and t in the range between low pressures and extremely high temperatures, when the gas's water moves virtually independently of one another, is known as the ideal gas, also known as the perfect gas law.

PV = nRTp = pressure in PaV

= volume in m³n = number of molesR

= molar gas constant (8.31 JK⁻¹mol⁻¹)T

= temperature in Kpressure ⇒ 99.7 × 10³ Pa

temperature ⇒ 35.0 + 273 = 308

KpV = nRT

= 99.7×10³×V= 4.30×8.31×308V

=(4.30×8.31×308)/(99.7×10³3 )V

= 0.11 m­³

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Answer:

it should be chlorine gas

Explanation:

the mass of nitric oxide produced by the reaction of 8.4 g of oxygen gas is 4.32 g. ammonia chemically reacts with oxygen gas to produce nitric oxide and water.

Common uses of oxygen include production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.

Oxygen helps organisms grow, reproduce, and turn food into energy. Humans get the oxygen they need by breathing through their nose and mouth into their lungs. Oxygen gives our cells the ability to break down food in order to get the energy we need to survive.

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Answer:

A solute and a solvent mixed together.

Explanation:

A solution is a solute and a solvent mixed together. An example would be salt water. Salt would be the solute (the thing that's getting dissolved) and water would be the solvent (the thing that does the dissolving)