1. A dry food product is contained in a 1 cm x 4 cm x 3 cm box using a polymer film to protect the oxygen sensitivity of the product. The concentration gradient across the film is defined by the oxygen concentration in air (0.01164 kg/m3) and 0.244 kg/m3 within the package. The oxygen diffusivity for the polymer film is 3 x 10-16 m2/s. Estimate a- the allowable flux of oxygen into the package (in kg O2/s), and b- the film thickness needed, to ensure a product shelf life of 10 months. The shelf life of the product is established as the time when oxidation reactions within the product have used 0.5 mol of oxygen.

Answer:

Mass = 6.538 g

Explanation:

Given data:

Mass of zinc hydroxide produced = 9.65 g

Mass of zinc required = ?

Solution:

Chemical equation:

Zn + 2MnO₂ + H₂O      →      Zn(OH)₂ + Mn₂O₃

Number of moles of zinc hydroxide:

Number of moles = mass/molar mass

Number of moles = 9.65 g/ 99.42 g/mol

Number of moles = 0.1 mol

now we will compare the moles of zinc and zinc hydroxide,

                  Zn(OH)₂           :          Zn

                       1                  :          1

                    0.1                  :         0.1

Mass of zinc required:

Mass = number of moles × molar mass

Mass = 0.1 mol × 65.38 g/mol

Mass = 6.538 g

Answer: 6.35

Explanation:

Answer:

C.) It is the functional group that distinguishes one amino acid from another.

Explanation:

An R group is also known as a random group and is one of the key components of an amino acid. It contributes to their wide variety.

The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another. Option C is correct.

The functional groups are the some groups of chemicals oh hydrogen and notrgen and oxygen or carbon combination like carboxylic acid they are combination of carbon and amines as they are amnio groups etc.

The R attached at the end represents the different functional gropus of amino acids in the chain of hydrocarbon compound or orgamic compounds as they are primay and secondry and tertiary amines.

Therefore, Option C is correct.The role of an R group in an amino acid as It is the functional group that distinguishes one amino acid from another.

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Answer:

a

Explanation:

Answer:

its c and d i just took the test

Explanation:

Electric force is degenerated when papers are attracted onto the comb and when the nails attached to the stone. In both cases a static electricity is  generated. Thus, option A and C are correct.

When a material is rubbed the electrons gets delocalized and the material gets a negative charge. For instance when comb is rubbed through hair it acquires a negative charge and this when comes in contact with a paper, the paper will attracts on the comb.

The random charges of the paper gets aligned temporarily into two poles by the attraction of electrons from the comb. Thus the positive pole of the comb gets attached to the comb and there creates a static electricity.

The the conducting nails when scratched on the stone a static electricity generates whereas in the case of a bar magnet no electric field is comes in action when it attracts the nails  to the magnetic field. Thus, photos A and C are correct.

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Answer:

See explanation

Explanation:

Hydrogen has only one valence electron. Sometimes, hydrogen is included as part of group 1 or 17 in the periodic table. Is this correct? Well, the answer to this question is not so straight forward!

Let us remember that hydrogen forms a univalent positive ion H^+ just like the group 1 elements, but it also forms a univalent negative ion H^- just like group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements. This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.

However, it is convenient to include hydrogen in the main groups 1 or 17 when discussing its chemical properties in order to make it easier to assimilate. If we place hydrogen in group 1, we can understand that it forms univalent positive ions. Similarly, if we place it in group 17, we understand that it forms univalent negative ions.

Most times hydrogen is just written separately at the top right corner of the periodic table and not as a member of any group because of the issues outlined above.

Hydrogen is placed in the main group of the periodic table since it has only one electron in it and it also behaves like alkali metal properties.

Hydrogen forms a univalent positive ion [tex]H^+[/tex]group 1 elements, but it also forms a univalent negative ion [tex]H^-[/tex]group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements.

This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.

If we place hydrogen in group 1, we can understand that it forms univalent positive ions and if it is placed in halogen group it will form univalent negative ion.

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Answer:

sin  = (330)

csc = (60)

−4 = cot (−45)

Explanation:

im not sure what you were looking for, make me brainlest please?

Answer:

Ba,Sr,Ca,Be

Explanation:

as atomic size increases ionisation potential decreases

Answer:

heat wave

Explanation:

A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere.

Answer:

a is oxidation

b is reduction

c is reduction

d is oxidation

hope it helps you

Answer:

The answer is Phospholipids.

Explanation:

A phospholipid bilayer. Phospholipids spontaneously form stable bilayers, with their polar head groups exposed to water and their hydrophobic tails buried in the interior of the membrane.

I really hope this helps!! Have an amazing day!! :)

Answer:

.574

Explanation:

smallest number of digits in the expression was 3, so the final answer should have 3 sig figs

Answer:

metal Atom

Explanation:

every transition metal atom are responsible for the flame color. Some metal are also confirmed by flame test.

Answer:

c. benzoic acid

Explanation:

The given reaction is an example of a Grignard reaction:

When chlorobenzene (C₆H₅Cl) reacts with Mg in ether, an intermediate is formed (C₆H₅MgCl).

Said intermediate then reacts with CO₂ producing a benzoic acid salt (C₆H₅CO₂X), this salt is then neutralized with dilute HCl producing benzoic acid (C₆H₅CO₂H).

Answer:

Ti

Explanation:

Ti is titanium and does not share any similar properties with the likes of Si, silicon and At, astatine.

Answer:

B as its not specific enough

Answer:

560 mph East

Explanation:

Velocity is just speed with direction pretty much.

Answer:

False

Explanation:

Answer:

False

Explanation:

Water's freezing point is at 0 degrees celsius

Answer:

Because i want to. would be the reply

Explanation:

VOTE ME BRAINLIEST PLSSSSSSSSS

Answer:

none of the above

option d

Answer:

Volume of ammonia produced = 398.7 dm³

Explanation:

Given data:

Volume of N₂ = 200 dm³

Pressure and temperature = standard

Volume of ammonia produced = ?

Solution:

Chemical equation:

N₂ + 3H₂     →      2NH₃

Number of moles of N₂:

PV = nRT

1 atm× 200 L = n× 0.0821 atm.L/mol.K × 273 K

n = 200 atm.L /22.41 atm.L/mol

n = 8.9 mol

Now we will compare the moles of ammonia and nitrogen.

               N₂          :         NH₃

                1            :           2

              8.9          :        2/1×8.9 = 17.8 mol

Volume of ammonia:

1 mole of any gas occupy 22.4 dm³ volume

17.8 mol ×22.4 dm³/1 mol = 398.7 dm³

Answer:5.=D

6.=B

Explanation:

Answer:

FeCl₂

Explanation:

Empirical formula is the simplest formula of a compound.

Mass percentage of Chlorine  = 56%

Mass percentage Iron  = 100  - 56  = 44%

                                                              Elements  

                                                 Fe                                 Cl

Percentage mass                    44                                  56

moles                                      44/55.85                   56/35.5

                                                  0.79                         1.56

Divide by the smallest

number                                    0.79/0.79                 1.56/0.79

                                                        1                                 2

The empirical formula of the compound is FeCl₂

Answer:

False

Explanation:

Answer:

x = 150 dm

Explanation:

10 cm = 1 dm

100 cm² = 1 dm²

15,000 cm² = 150 dm²

Answer:

csc = (60)

cos = (390)

−4 = cot (−45)

Explanation:

make me braienst please?

Answer:

3Cu(NO3)2 + 2Al —> 2Al(NO3)3 + 3Cu

Explanation:

From the question given above,

Copper (II) nitrate reacts with aluminum to form aluminum nitrate and copper. This can be obtained represent as follow:

Cu(NO3)2 + Al —> Al(NO3)3 + Cu

Thus, we can balance the above equation as follow:

Cu(NO3)2 + Al —> Al(NO3)3 + Cu

There are 2 atoms of N on the left side and 3 atoms on the right side. It can be balance by putting 3 in front of Cu(NO3)2 and 2 in front of Al(NO3)3 as shown below:

3Cu(NO3)2 + Al —> 2Al(NO3)3 + Cu

There are 3 atoms of Cu on the left side and 1 atom on the right side. It can be balance by putting 3 in front Cu as shown below:

3Cu(NO3)2 + Al —> 2Al(NO3)3 + 3Cu

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by putting 2 in front of Al as shown below:

3Cu(NO3)2 + 2Al —> 2Al(NO3)3 + 3Cu

Thus, the equation is balanced.

Stimuli are the senses that cause an organism to react. Internal sensations include things like hunger and thirst that are produced inside the body, hence option A is correct.

A stimulus is a perceptible alteration in the internal or external surroundings of an organism's physical or chemical composition.

Sensitivity is the capacity of an organism or organ to recognize external stimuli and to respond appropriately to them.

A stimulation that comes from outside the organism is known as an external stimulus. Light is one example of an outside stimulation. Although it comes from outside the body, it has an impact there as well.

Therefore, sunlight and a loud sound are the examples of external stimuli, while  hunger is an internal stimulus.

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Answer:

carbon dioxide and water.

Explanation:

Chemical equation:

2C₂H₆ + 7O₂      →    4CO₂ + 6H₂O

Reactants are present on the left side of chemical equation while products are present on the right side of chemical equation. In given chemical equation ethane and oxygen are reactant while carbon dioxide and water are product.

The given reaction is combustion reaction. Ethane is burnt in the presence of oxygen and produces carbon dioxide and water.

The reaction also follow the law of conservation of mass.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

Answer:

The oxidation number of sulphur in is +2

Explanation:

S2O3 2-

2 (S) + 3(O)=-2

2 (S) + 3(-2)=-2

2 (S) + (-6) =-2

2 S = +4

S= +2

Answer:

ΔS = nR(In (Vf/Vi))

Explanation:

We are told the temperature has the same value and therefore it's constant.

Formula for change in entropy isothermally is;

ΔS = nR(In (V2/V1))

V2 is final volume and V1 is initial volume.

We are told that the volume changes from Vi to Vf.

Thus, V2 = Vf and V1 = Vi

Hence;

ΔS = nR(In (Vf/Vi))