Amol has divided some substances into two groups as shown in the table below. He wants to further separate all the substances in Group 1 again into exactly two groups. Which of the following criteria will allow him to do so?

A. liquids and solids  

B. mixtures and pure substances

C. naturally occurring and man-made substances.

D. substances completely soluble and insoluble in water.​

The amount of sodium azide required will be 123.72 grams

From the equation of the reaction below:

[tex]2NaN_3 --- > 2Na + 3N_2[/tex]

The mole ratio of sodium azide to nitrogen gas is 2:3

Mole of 80.0 g nitrogen = 80/28.02 = 2.855 moles

Equivalent mole of sodium azide = 2/3 x 2.855 = 1.903 moles

Mass of 1.903 moles sodium azide = 1.903 x 65 = 123.72 grams

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The statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."

The term electrical resistance refers to the opposition that is offered to the flow of  current. We know that a superconductor is one whose electrical resistance drops to zero when it s cooled to the absolute zero.

Hence, the statement that describes what the scientist is observing is; "the scientist is observing an intensive property of a superconductor."

Missing parts:

A scientist observes that the electrical resistance of a superconducting material drops to zero when the material is cooled to very low temperatures. Which of the following statements best describes what the scientist is observing?

The scientist is observing the electrical power of a superconductor.

The scientist is observing the temperature of a superconductor.

The scientist is observing an intensive property of a superconductor.

The scientist is observing an extensive property of a superconductor

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99.25 grams = .09925 Kg of fluorine gas is needed.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex]of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

Balanced chemical reaction: P₄ (s) + 6F₂ (g) → 4PF₃ (g).

m(PF₃) = 120.0 g; mass of phosphorus trifluoride.

n(PF₃) = m(PF₃) ÷ M(PF₃).

n(PF₃) = 120 g ÷ 88 g/mol.

n(PF₃) = 1.36 mol.

From chemical reaction: n(PF₃) : n(F₂) = 4 : 6 (2 : 3).

n(F₂) = 1.36 mol · 3 / 2.

n(F₂) = 2.04 mol; amount of substance.

m(F₂) = n(F₂) · M(F₂).

m(F₂) = 2.04 mol · 38 g/mol.

m(F₂) = 77.52 g ÷ 0.781.

m(F₂) = 99.25 g.

Hence, 99.25 grams = .09925 Kg of fluorine gas is needed.

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4) 0.05 L of the stock solution must be taken.

5) The osmotic pressure would be 12.23 atm

4) Using the dilution equation: m1v1=m2v2

   m1 = 1M, m2 = 0.1M, v2 = 0.5L

      v1 = m2v2/m1 = 0.1 x 0.5/1 = 0.05 L

5) Using the formula: osmotic pressure = icRT

 Since sucrose does not ionize in water,  i = 1

  C = 0.5

  R = 0.0821

  T = 298

  Osmotic pressure = 1 x 0.5 x 0.0821 x 298 = 12.23 atm

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Answer:

There are many equations for oxidation and reduction, but the most relevant ones are the equations for the half-reactions. In general, the equation for oxidation is:

Oxidation: Reducing Agent + O2 → Oxidizing Agent

And the equation for reduction is:

Reduction: Oxidizing Agent + e- → Reducing Agent

These equations show the transfer of electrons that occurs during oxidation and reduction.

Explanation:

O Hemoglobin

Explanation:

Hemoglobin (Heme + Globin) The protein hemoglobin is a molecule which is responsible for carrying almost all of the oxygen in the blood.

Moles of O_2

No of atoms

Note the formula

[tex]\boxed{\sf No\:of\:atoms=No\:of\:moles\times Avagadro\:no}[/tex]

Find no of moles

[tex]\\ \tt{:}\dashrightarrow \dfrac{8.78g}{32g/mol}[/tex]

[tex]\\ \tt{:}\dashrightarrow 0.27mol[tex]

No of atoms

[tex]\\ \tt{:}\dashrightarrow 0.27\times 6.023\times 10^{23}[/tex]

[tex]\\ \tt{:}\dashrightarrow 1.6\times 10^{23}atoms[/tex]

N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

The molecular orbital is formed by the combination of atomic orbitals. We should note that the number of molecular orbitals must be equal to the number of combining atomic orbitals.

Now we know that N2 is a homonuclear molecule and NO+ is a heteronuclear molecular ion hence the  MO structure of NO+ different than that of N2.

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Answer:

Halo

Explanation:

The freezing point depression is 2.1 °c.

The freezing point is the point that a liquid is converted to solid. Now we know that the freezing point is a colligative property.

Number of moles of glucose =  10.0g /180 g/mol =0.056 moles

Mass of water =  50.0g or 0.05 Kg

Molality of the solute = 0.056 moles/ 0.05 Kg = 1.12 m

The freezing point depression is obtained from;

ΔT = K m i

ΔT = 1.86°c/m *  1.12 m * 1

ΔT = 2.1 °c

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A) Y because the line is flat, not going up or down. So, constant or no change in population

B) A positive correlation with introduction to animal A (because population is going up or increasing)

C)

1.New predator (due to Animal A eating them, meaning more of their predators are eating them)

2. Lack of food or food availability due to competition (from Animal A, e.g. if they eat the same food)

3. Introduction to a new disease (from Animal A)

Hope this helps!

The action that will most likely help the scientist study the particle's motion is that He needs to use quantum mechanics, not Newtonian mechanics because this is a nanotechnology product.

This refers to the branch of mechanics that has to do with the description of motion and the different concepts of quantization of energy

Hence, we can see that based on the fact that a scientist uses a new quantum dot to make a dye and uses Newton's laws, but he seems to be breaking the laws, so he needs to use quantum mechanics because this is a nanotechnology product.

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The conjugate base of CO3-2 is hydrogen carbonate.

A conjugate base can be defined as a base that can be derived from another base by the reason of it loosing or gaining an electron.

Conjugate base are very similar because they both posses the same elements.

In conclusion, The conjugate base of CO3-2 is hydrogen carbonate.

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The correct statements about all greenhouse gases include the following:

These are gases which are found in the atmosphere and have varying effects on the energy present on earth.

Examples include carbon dioxide, methane etc and their characteristics are mentioned above.

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Answer:

star 3

Explanation:

the color determines the fusion in between

Answer:

the compound is bromine trifluoride

Explanation:

it contains 58.37 as there is no compound with 58.4 bromine formula brf3

Answer:

C. Xenon

Explanation:

The question only requires you to use your visual skills to identify the unknown gas. Look at the spectra of unknown gas and xenon, are they not identical? SInce they are same, the unknown sample must be xenon.

The recipe for an omelet are:

Ingredients

Recipe:

When we turn on the heat and place the pan, a heat transfer takes place and heat transfers from one body to another.

When we add butter to the pan, then the temperature of the pan was more than that of the butter.

Since the melting point of butter was less than the temperature of the pan, the the melting of butter takes place.

When we add the egg, the evaporation of the liquid present in the egg yolk and the egg white takes place.

These are the chemical reactions depicted.

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Answer:

1. Make people aware about the concept of Reduce, Recycle and Reuse.

2. Reduce the use of pesticides and fertilizers in agricultural activities.

3. Avoid buying packages items as they will lead to garbage and end up in landfill site.

4. Ensure that you do not litter on the ground and do proper disposal of garbage.

5. Buy biodegradable products.

6. Do organic gardening and eat organic food that will be grown without the use of pesticides.

7. Create dumping ground away from residential areas.

I hope it helps u

Answer:

They have been found to cause cancer in humans meaning any release of carcinogens will increase, not decrease, CANCER RISK.

Explanation:

Certain chemicals, including benzene, beryllium, asbestos, vinyl chloride, and arsenic are known human carcinogens, meaning “they have been found to cause cancer in humans.” A persons risk of developing cancer depends on how much, how long, how often, and when they are exposed to these chemicals.

The volume of the radiator solution formed with the 197 mL of antifreeze is 788 mL.

A percentage is given as the respective ratio of the quantity present with respect to others.

The solution of 25% v/v can be depicting the presence of a 25% volume of antifreeze in the radiator solution.

The volume of the radiator solution has 197 mL of antifreeze. The total volume of the solution suppose is x.

25% of x = 197 mL

25/100 * x = 197

x = 788 mL

The volume of the radiator solution formed with 25% v/v antifreeze is 788 mL.

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The molar heat of vaporization of substance Z is 3.375 kJ/mol.

The molar heat of vaporization of substance Z is calculated as follows;

ΔH(vap) = E/n

where;

ΔH(vap) = 5.4 kJ/1.6

ΔH(vap) = 3.375 kJ/mol

Thus, the molar heat of vaporization of substance Z is 3.375 kJ/mol.

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Explanation:

Taking into account the definition of calorimetry and latent heat, 11,690 J is required to change 35 g of water from ice to liquid water.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing in the definition of latent heat:

Q = 35 g× 334 [tex]\frac{J}{g}[/tex]

Solving:

Q= 11,690 J

Finally, 11,690 J is required to change 35 g of water from ice to liquid water.

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During glycolysis is used glucose, ADP and pyruvate and produce ATP, water and NADH.

Glycolysis is the first step of cellular respiration by which glucose is used to generate energy in the form of ATP.

Cellular respiration has three sequential steps, i.e., glycolysis, the Krebs cycle and oxidative phosphorylation.

Glycolysis is the cellular respiration step that generates 2 net high energy ATP molecules and 2 reduced NADH.

In conclusion, glycolysis uses glucose, pyruvate and ADP to generate ATP, water and Nicotinamide adenine dinucleotides (NADH).

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The change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

The change in temperature of a substance can be calculated using the following formula:

Q = mc∆T

Where;

500 = 23 × 0.24 × ∆T

500 = 5.52∆T

∆T = 500 ÷ 5.52

∆T = 90.5°C

Therefore, the change in temperature of silver if 500 J of heat are added to a 23 g sample of silver is 90.5°C.

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The graph of the heating of methanol has been attached.

The temperature at 170 K is approximately the melting point of methanol.

The temperature at 350 K is approximately the boiling point of methanol.

If we provide heat before 170 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in solid form.

If we provide heat at 170 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from solid to liquid.

If we provide heat after 170 K temperature and before 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in liquid form.

If we provide heat at 340 K temperature then all the heat provided to the methanol will result in change in physical from of methanol from liquid to gas.

If we provide heat after 350 K temperature then all the heat provided to the methanol will result in rise in temperature of methanol in gas form.

So, the heat given to methanol will rise its temperature except at its Boiling and melting point. At those temperature heat will change the physical form of methanol first. and the graph also have been attached of between boiling point and melting point as given in question  .

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The resistance has a linear relationship with temperature because it increases as temperatures increases.

Temperature refers to the activity (motion or thermal energy) in the atoms that form molecules.

The resistance of an electric conductor increases as the temperature increases since the thermal energy of subatomic electrons also increases.

In conclusion, the resistance has a linear relationship with temperature because it increases as temperatures increases.

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The temperature regulator of the gas tank be set at 842.64 K

The volume of hydrogen ammonia produced is given by the mole ratio of the gases in the equation below:

3 H₂ + N₂ → 2 NH₃

The mole ratio is 2:3

Volume of ammonia produced = 2/3 * 60 kL = 40 kL

The temperature regulator value is determined using the general gas equation:

T₂ = P₂V₂T₁/P₁V₁

T₂ = (2000 * 6.25 * 273.15)/(101.3 * 40)

T₂ = 842.64 K

The temperature regulator of the gas tank be set at 842.64 K

In conclusion, the general gas equation is useful in determining gas volume, pressure and temperatures.

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