The amount of heat required to melt 2 lbs of ice is twice the amount of heat required to melt 1 ib of ice. is this observation a macroscopic or microscopic description of chemical behavior? Explain your answer.

Answers

Answer 1
Answer:

The observation in this instance relates to the quantity of heat needed to melt ice, and it is expressed in terms of weights (2 lbs and 1 lb) and a comparison (twice the amount).

Without going into detail into the different molecules or their interactions, it concentrates on the general behaviour and characteristics of the substance (ice) as a whole.

A microscopic description, on the other hand, would describe the behaviour in terms of the molecular or atomic interactions that take place at the particle level. It would go into ideas such as the amount of heat required to dissolve the intermolecular interactions between water molecules.

Therefore, the observation regarding how much heat is needed to melt ice is a macroscopic description since it ignores the underlying molecular interactions in favour of the substance's general behaviour and qualities.        

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Answer 2
Answer:

The observation that melting 2 lbs of ice requires twice the heat of melting 1 lb is a macroscopic description, focusing on observable properties and behavior without exploring microscopic details.

This observation is a macroscopic description of chemical behavior. Macroscopic descriptions involve the properties and behavior of substances on a large scale that can be observed directly, without delving into the molecular or atomic details. In this case, the statement refers to the amount of heat required to melt a certain quantity of ice, and it is expressed in terms of macroscopic, measurable quantities (pounds of ice and the associated heat).

The macroscopic observation does not provide insight into the molecular or atomic interactions within the ice but rather focuses on the overall behavior of the substance. The concept that the amount of heat required to melt 2 lbs of ice is twice that needed for 1 lb of ice is a statement about the material's behavior at a larger scale.

This observation aligns with the macroscopic principles of heat and phase transitions, where the heat required for a phase change is directly proportional to the mass of the substance undergoing the transition. The macroscopic perspective is concerned with observable properties and measurements, making it a practical and accessible way to describe chemical behavior without delving into microscopic details.

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producers flowing from the bottom level to primary consumers. What
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О
The remaining 90% is transformed for life activities such as movement, growth, or
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Answers

The remaining 90% transforms into Hydrogen and Oxygen. The remaining 90% is recombined to maker larger molecules. I think

Polymers are large molecules composed of simple units repeated many times. Thus, they often have relatively simple empirical formulas. Calculate the empirical formulas of the following polymers: (a) Lucite (Plexiglas); 59.9% C, 8.06% H, 32.0% O (b) Saran; 24.8% C, 2.0% H, 73.1% Cl (c) polyethylene; 86% C, 14% H (d) polystyrene; 92.3% C, 7.7% H (e) Orlon; 67.9% C, 5.70% H, 26.4% N

Answers

Answer:

(a) C_5H_8O_2

(b) CHCl

(c) CH_2

(d) CH

(e) C_3H_3N

Explanation:

Hello,

(a) For the lucite, one computes the moles of C, H and O that are present:

n_C=0.599gC*(1molC)/(12gC)=0.05molC\nn_H=0.0806gH*(1molH)/(1gH)=0.0806molH\nn_O=0.32gO*(1molO)/(16gO)=0.02molO\n

Now, dividing each moles by the smallest moles (oxygen's moles), one obtains:

C=(0.05)/(0.02) =2.5;H=(0.0806)/(0.02) =4;O=(0.02)/(0.02) =1

Finally, we look for the smallest whole number subscript by multiplying by 2, so the empirical formula turns out into:

C_5H_8O_2

(b) For the Saran, one computes the moles of C, H and Cl that are present:

n_C=0.248gC*(1molC)/(12gC)=0.021molC\nn_H=0.02gH*(1molH)/(1gH)=0.02molH\nn_(Cl)=0.731gCl*(1molCl)/(35.45gCl)=0.021molCl\n

Now, dividing each moles by the smallest moles (hydrogen's moles), one obtains:

C=(0.021)/(0.02) =1;H=(0.02)/(0.02) =1;Cl=(0.021)/(0.02) =1

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

CHCl

(c) For the polyethylene, one computes the moles of C and H that are present:

n_C=0.86*(1molC)/(12gC)=0.072molC\nn_H=0.14gH*(1molH)/(1gH)=0.14molH

Now, dividing each moles by the smallest moles (carbon's moles), one obtains:

C=(0.072)/(0.072) =1;H=(0.14)/(0.072) =2

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

CH_2

(d) For the polystyrene, one computes the moles of C and H that are present:

n_C=0.923*(1molC)/(12gC)=0.077molC\nn_H=0.077gH*(1molH)/(1gH)=0.077molH

Now, dividing each moles by the smallest moles (either carbon's or hydrogen's moles), one obtains:

C=(0.077)/(0.077) =1;H=(0.077)/(0.077) =1

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

CH

(e) For the orlon, one computes the moles of C, H and N that are present:

n_C=0.679*(1molC)/(12gC)=0.057molC\nn_H=0.057gH*(1molH)/(1gH)=0.057molH\nn_N=0.264gN*(1molN)/(14gN)=0.019molN

Now, dividing each moles by the smallest moles (nitrogen's moles), one obtains:

C=(0.057)/(0.019) =3;H=(0.057)/(0.019) =3;N=(0.019)/(0.019) =1

Finally, as all of the subscripts are whole numbers, the empirical formula turns out into:

C_3H_3N

Best regards.

What is chemical energy? (2 points)a
Energy that is stored or released during a chemical reaction

b
Energy that is destroyed during a physical change

c
Energy that is released during a phase change

d
Energy that is created when a substance is being burned

Answers

Final answer:

Chemical energy is the energy that is stored or released during a chemical reaction. It exists within the chemical bonds of molecules and can be converted into other forms of energy.

Explanation:

Chemical energy refers to the energy that is stored or released during a chemical reaction. It is a form of potential energy that exists within the chemical bonds of molecules. When a chemical reaction takes place, these bonds are broken or formed, resulting in the release or absorption of energy.

For example, when a fuel such as gasoline is burned, the chemical energy stored in the hydrocarbon molecules is converted into heat and light energy. Similarly, during photosynthesis, plants convert sunlight into chemical energy in the form of glucose.

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Explanation:

Chemical energy

Chemical energy is energy stored in the bonds of chemical compounds, like atoms and molecules. This energy is released when a chemical reaction takes place.

Usually, once chemical energy has been released from a substance, that substance is transformed into a completely new substance.

What is the mass in grams of 1.9×1023 atoms of lead?

Answers

Answer:

Explanation:

# moles that exist in 1.9 X 10 23 =

             =  # of atoms/# of Avogadro 's num

             =    1.9 X 10 23 / 6.02x10 23

              = 0.266 mole of Pb

now we calculate the mass

   mass of lead = # mol x m.wt

                       =    0.266 X 106.4

                       = 28.30 gram

The sun warming the surface of a rock is
conduction
convection
radiation

Answers

Radiation..................
Radiation is your answer...

Help! Can someone please explain and break down the answers to both? I’m so confused!1) The moles of H2O that f am be obtained from 15.0mL of 0.250 M HCl

2) the volume of 0.150 M KMnO4 needed to replaced 1.85 mol MnCl2

Answers

Hope this helps you!!