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Answer:

A)  positive; added

Explanation:

Based on the reaction:

2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)

2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.

That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.

Thus, right answer is:

A)  positive; added

Answer:

Electron

Explanation:

Answer:

1) C₃H₄N

Explanation:

The empirical formula of a compound is the formula that gives the positive integer ratio of the atoms of the elements in the compound in the simplest form

The mass of carbon in the compound = 90 grams

The molar mass of carbon = 12.011 g/mol

The number of moles of carbon = 90 g/(12.011 g/mol) ≈ 7.4931313 moles

The mass of hydrogen in the compound = 11 grams

The molar mass of hydrogen = 1.00794 g/mol

The number of moles of carbon = 11 g/(1.00794 g/mol) ≈ 10.913348 moles

The mass of nitrogen in the compound = 35 grams

The molar mass of nitrogen = 14.0067 g/mol

The number of moles of carbon = 35 g/(14.0067 g/mol) ≈ 2.49880414 moles

Dividing by the smallest mole ratio gives;

The proportion of carbon, C = 7.4931313/2.49880414 = 2.9987 ≈ 3

The proportion of nitrogen, N = 10.913348 /2.49880414 = 4.367 ≈ 4

The proportion of nitrogen, N = 2.49880414 /2.49880414 = 1

Therefore, the empirical formula of the compound is C₃H₄N.

Answer:

1) C₃H₄N

Explanation:

took test

Answer:

Tbe reddish brown substance might be the rust that formed overtime in a iron tap and over the course of time mixed with other dust and particles it might have formed another substance .

The reddish brown substance is iron oxide which is formed by the reaction of iron materials with water and air. This oxide layer above the surface of metallic parts is called rust.

The Fe is a reddish metal more reactive towards the air and water as well. Fe is a very common in the manufacturing of many household materials. However, by the action of air and water these metallic parts undergo corrosion.

Corrosion is a chemical change involving the formation of oxide layer over the metallic surface which eventually corrode the substance and make it unusable.

Fe reacts with oxygen of water or air forming the reddish brown iron oxide Fe₂O₃ that is what called the rust. Rust can be seen in needles, vehicle parts made of iron etc.

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Answer:

The reaction can produce 287 grams of iron(II) carbonate

Explanation:

To solve this question we must find the moles of iron(II) chloride that react. Using the chemical equation we can find the moles of iron(II) carbonate and its mass -Molar mass FeCO3: 115.854g/mol-

Moles FeCl2:

1.24L * (2.00mol / L) = 2.48 moles FeCl2

As 1 mol FeCl2 produce 1 mol FeCO3, the moles of FeCO3 = 2.48 moles

Mass FeCO3:

2.48mol * (115.854g / mol) =

Answer:

287

Explanation:

Answer:

The molecular mass of carbon dioxide is 44.01amu

Answer:

bR2 since it is nonpolar

Answer:

protists

animals

fungi

plants

Explanation:

i took the test let me know if im wrong tho

The biotic factors from the following options are protist, animals, fungi, and plants. Options A, B, c, and D are correct.

Biotic factors are those factors which can grow, and reproduce themselves.

Plants, animals, protists, and fungi are biotic factors that live, eat ad reproduce.

Salinity is the quality of any solution. It is not a biotic factor.

Thus, the correct options are A, B, c, and D.

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Answer:

567 calories.

Explanation:

There 567 calories in 100 grams of peanut. In 100 grams of peanut, 49 gram is the fat, 26 grams of protein, 16 grams of carbohydrates, Sodium is 18 mg, Potassium is 705 mg. Calcium is present in peanut about 9%, Iron is 25% , Vitamin B-6 is 15%  and Magnesium is 42% of their total weight. Oil content is high in the Peanut so this is the reason for high calories in peanut. It is a good source of proteins and potassium.

Answer:

The particle theory states that the particles of a substance spread out as they gain energy when heated. Thus, the particles take up more space, which means that the density of the substance decreases. It is almost always true that, for each pure sub­ stance (for example, gold), the density of its solid state is greater than the density

Explanation:

Answer: Gasoline

Explanation: Siri said so

The non-aqueous means it does not contain water. Among the given options gasoline is an example of a non-aqueous solution. The correct option is A.

The solution which is obtained by dissolving solute in any liquid other than water is defined as the non-aqueous solution. If solute is dissolved in solvent like benzene, alcohol, ether, carbon disulphide, acetone etc. forms a non aqueous solution.

The major difference between the aqueous and non-aqueous solution is that the solvent of an aqueous solution is water whereas in non-aqueous solutions, the solvent is any substance other than water.

The solvent of non-aqueous solution can be polar or nonpolar and depending on the polarity the solutes dissolve in the solvent. Here gasoline is an example of the non-aqueous solution. The gasoline is a crude oil which does not include water as an ingredient.

Thus the correct option is A.

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Answer:

22.2 g of MgF₂

Explanation:

We star from the reaction:

NaF → sodium fluoride

Mg → Magnesium

2NaF  +  Mg →  MgF₂  +  2Na

2 moles of sodium fluoride react to 1 mol of Mg in order to produce 1 mol of magnesium fluoride and 2 moles of sodium.

We convert mass of the reactant to moles:

30 g . 1mol / 41.98 g = 0.715 mol

We assume that Mg is in excess

As ratio is 2:1, if we have 0.715 moles of NaF we may produce the half of moles, of MgF₂

0.715 mol /2 = 0.357 moles of MgF₂

We convert moles to mass: 0.357 mol . 62.30g /mol = 22.2 g

C. 0.5

This is the answer.

(assuming that the D option is 1, if it is 0.1 then the answer is 0.1)

[tex]0.5[/tex]

Explanation:

As you know that decreasing in the concentration of OH- (i.e., 14, 13, 12, 11,..) makes to increase in the concentration of H+ ions (5,4,3,2,1).

Answer:

AlI3 is the chemical formula and the name of compound is Aluminium iodide.

Answer:

Which of the following best explains the relationship between peak-to-peak amplitude and semi-amplitude? Semi-amplitude is half the distance of the peak-to-peak amplitude. Semi-amplitude is the same distance as the peak-to-peak amplitude.

Answer:

b. 485 kPa

Explanation:

Gay-Lussac's law express that the pressure of a gas under constant volume is directly proportional to the absolute temperature. The equation is:

P1T2 = P2T1

P is pressure and T absolute temperature of 1, initial state and 2, final state of the gas

Where P1 = 74psi

T2 = 20°C + 273.15 = 293.15K

P2 = ?

T1 = (95°F -32) * 5/9 + 273.15 = 308.15K

Replacing:

74psi*293.15K = P2*308.15K

70.4psi

In kPa:

70.4psi * (6.895kPa / 1psi) =

Answer:

I do. I am in tenth. What area are you in?

Explanation:

Answer:

8th finna be in 9th wbu

Explanation:

Answer: let me see I gotta do the work first then I’ll give you the answers

Explanation:

Answer:

It improves the texture of the flour

Explanation:

Flour is supposed to have a very fine texture. Commercial flour is not expected to occur in lumps. Lumps reduce the utility of the flour.

Hence, to improve the texture of the commercial flour, it is thoroughly sifted to ensure that there are no large lumps in the flour.This is so important when producing cake flour where the achievement of fine texture is of utmost priority.

Answer:

[tex]4.08x10^{25} molecules[/tex]

Explanation:

Hello there!

In this case, since the understanding of the mole-molecules relationships is analyzed via the Avogadro's number:

[tex]1mol=6.022x10^{23}molecules[/tex]

Next, we can solve the following setup by starting with the 67.8 moles of helium and obtaining the required molecules as follows:

[tex]67.8mol*\frac{6.022x10^{23}molecules}{1mol}\\\\=4.08x10^{25} molecules[/tex]

Best regards!

Answer:

you would expect 0 radioactive nuclei to be present

Explanation:

got it right on the assignment

Answer:

105Comprendes las leyes de la electricidadAprende másClasificación de los materialesUn medio o material que permite el movimiento de las cargas eléctricas (electrones) en respuesta a una fuerza eléctrica, se denomina conductor. Los materiales conductores son los que se pueden electrizar en toda su superficie, debido a que los electrones se mueven libremente. Los metales por lo general son buenos conductores de la electricidad.El flujo de las partículas cargadas es lo que se conoce como corriente eléctrica. Las partículas cargadas en una cierta dirección de un conductor chocan con los átomos, produciendo una pérdida de energía que se manifiesta en forma de calor.Una medida de oposición que presentan las partículas cargadas al moverse libre-mente en una cierta dirección de un material conductor es lo que se conoce como resistencia eléctrica.Los materiales que no permiten que las partículas cargadas se muevan hacia otra región del material a una fuerza eléctrica, son llamados aislantespor ejemplo, la madera.Existen otros tipos de materiales cuyas propiedades son intermedias entre los conductores y aislantes; se llaman semiconductores.Algunos ejemplos de materiales con estas características son:

Explanation:

Answer:

9.00 g H2O

Explanation:

Convert molecules to grams using stoichiometry

(3.01 * 10^23 molecules) * (1 mole H2O / 6.022 * 10^23 molecules) * (18.01 g / 1 mole H2O) = 9.00 g H2O

Answer:

answer  in picture

Explanation:

Answer:

2.25 moles H2

Explanation:

The equation N2+ 3H2 > 2NH3

1 mol of N2 gives 3 mol of H2

Then

. 75 mole N2 give 3*.75 = 2.25 moles of H2