The charge of the Fe ion in the compound FeO is blank
The charge of the Fe ions in the compound Fe2O3 is
blank

Answer:

the answer is D

Explanation:

When the elastic collision happens the particles energy does not change. There is no loss or gain of energy due to the elastic collision.

The energy of gas particles when an elastic collision takes place then "No energy is exchanged between the gas particles"

A collision between two bodies that would be elastic occurs when their combined kinetic energy stays constant.

Energy is the ability to do tasks. It can exist in various forms, including potential, kinetic, thermal, electrical, chemical, and nuclear.

When two objects collide, there was no net loss of kinetic energy across the system. This is known as an elastic collision. In elastic collisions, momentum, as well as kinetic energy would both be conserved.

Therefore the correct answer will be option (d)

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Answer:

Melting and boiling will be seen in this example. Condensation might be seen as well. In the Phases of Water Gizmo™, you can heat up or cool down a container of water.

Explanation:

Answer:

Building mountains.

Explanation:

Mountains are built by land being pushed over time. Its not made by weathering and erosion!

Hope this helps! :)

Answer:

[HNO₃] = 3.14 N

Explanation:

Relacionando normalidad con molaridad, ydado que el HNO₃ tiene solo un protón, ambas van a coinicidir asi que calculando la molaridad, será lo mismo decir que ese valor pertenece a la concentración normal.

Densidad de solución = 1.1 g/mL

Volumen de solución = 5L = 5000 mL

Masa de solución = 1.1 g/mL . 5000 mL = 5500 g

Ahora usamos el % p/p.

Si sabemos que en 100g de solución hay 18 g de soluto

En 5500 g de solución tendremos (5500 . 18) /100 = 990 g

Convertimos a moles = 990 g . 1mol /63g = 15.7 moles

Como el volumen de solución es 5L = 15.7 mol /5L = 3.14 M = 3.14N

Basicamente para calcular la normalidad hay que saber calcular los equivalentes de soluto los cuales se expresan como

masa de soluto / Equivalentes gramo, donde los equivalentes gramo se definen como el peso molecular /valencia. En este caso como el acido nitrico es monoprótico, la valencia es 1, y haciendo el procedimiento usando densidad de solución y el % peso en peso, ya sacamos la masa de soluto.

990 g / 63g/mol / 1 = 15.7 Equivalentes

N = Equivalentes/L de solucion → 15.7 Eq /5 L = 3.14N

The normality is 3.14 N

Given that the Density of solution = 1.1 g/mL

Volume = 5L = 5000 mL

So, Mass of solution = 1.1 g/mL . 5000 mL = 5500 g

Now we use % w/w.

Given that in 100g of solution there is 18 g of solute

Hence 5500 g of solution contains

(5500 . 18) /100 = 990 g of solute  

As the volume of the solution is 5L, to calculate the normality of the solution

N =  Mass of solute in grams/(volume of solution in litres × Equivalent weight)

Equivalent weight = molar mass/ number of hydrogen ions

here the number of H ions = 1

hence, equivalent weight = 63/1 = 63

The Normality is 990/(5×63) = 3.14N

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Answer:

glacial evidence found in South America

Answer: C. Glacial evidence

Answer:

you have to decide 865,000 with 1000 and the answer is 865

Answer:

Physiological

Explanation:

The process whereby plants respond and grow towards light is a physiological process.

Physiological processes are life-sustaining processes that require the combined efforts of cells, tissues, organs, and or systems along with that of biomolecules in the body.

The response of plants to light requires the efforts of a hormone that triggers the rapid mitotic division of cells of tissues/organs that are directly opposite the light source. Thus, the faster rate of division of these cells as compared to the cells of tissues/organs that are directly in contact with light leads to the plant's tissues/organs bending towards the light.

Answer:

this reaction is so the answer should be A

Answer:

The volume and density of the air in the balloon can change, therefore they need to use a rigid container such as plastic or metal to hold the air.

Explanation:

From the chemical equation it is clear that, one mole or 16 g of methane gas gives 2 moles or 36 g of water. Then, 15 g gives 33.7 g of water. The actual yield is 23.8 g. Then the percent yield is 70.6%.

Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.

molar mass of methane gas = 16 g/mol

molar mass of water = 18 g/mol

16 g of methane gives 2 moles or 36 g of water. Then 15 g of methane will gives:

(15×36)/16 = 33.7g

The actual yield of water = 23.8 g

then,

percent yield = 23.8 g/33.7 g × 100 = 70.6%.

Therefore, the percent yield of water is 70.6%.

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Answer:

COAL

Explanation:

Answer:

Coal!

Explanation:

Hope this helps!

I think it's aluminium chloride

Answer:

[tex]\boxed {\boxed {\sf M \approx0.864 \ M \ HBr}}[/tex]

Explanation:

The molarity of a solution is the moles per liter. It is found using this formula:

[tex]M=\frac { moles \ of \ solute}{liters \ of \ solution}[/tex]

First we must calculate moles, since we are given grams. To convert from grams to moles, the molar mass is used. This is also given to us, it is 80.91 grams per mole. We can use it as a ratio.

[tex]\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]

Multiply by the given number of grams.

[tex]314.5 \ g \ HBr *\frac {80.91 \ g \ HBr}{1 \ mol \ HBr}[/tex]

Flip the fraction so the grams of HBr cancel.

[tex]314.5 \ g \ HBr *\frac {1 \ mol \ HBr}{80.91 \ g \ HBr}[/tex]

[tex]\frac {314.5 \ mol \ HBr}{80.91 }=3.88703497714 \ mol \ HBr[/tex]

Now we know the moles, and can calculate the molarity.

There are 3.88703497714 moles of solute and 4.50 Liters of solution.

[tex]M= \frac {3.88703497714 \ mol }{ 4.50 \ L}[/tex]

[tex]M= 0.863785550476 \ mol/ L[/tex]

The original measurements have 4 and 3 significant figures, so we use the lowest number of 3 for our answer. For the number we calculated, that is the thousandth place.

The 7 in the ten thousandth place tells us to round the 3 to a 4.

[tex]M \approx 0.864 \ mol/ L[/tex]

[tex]M \approx 0.864 \ M \ HBr[/tex]

The molarity of the solution is about 0.864 M HBr.

Answer:

Explanation: I did the work online because I just worked on this.

Answer:

Europium/Eu ( not really sure )

The lanthanide element with the least mass is Lutetium (Lu)

Lutetium (Lu) is a member of the lanthanide series, which is a group of 15 elements located in the f-block of the periodic table. The lanthanide series starts with the element Lanthanum (La) and ends with Lutetium (Lu). Lutetium is the heaviest and most dense element in the lanthanide series. Lutetium has an atomic number of 71, indicating that it has 71 protons in its nucleus. It has a relatively high atomic mass of approximately 174.97 atomic mass units (u) according to the periodic table.

Hence, lutetium is the lanthanide element with the least mass.

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Answer:

Q= mc∆T(ice) + mLF(ice) + mc∆T(water) + mLV(water) + mc∆T(steam)

m=250 g = 0.25 kg = ¼ kg c(ice)= 2100 J/kg.K c(water)= 4200 J/kg.K LF(ice)= 333.7 kJ/kg LV(water)= 2256 kJ/kg c(steam)= 2080 J/kg.K

Explanation:

Q= ¼ × 2100 × (0°-(-30°)) + ¼ × 333700 + ¼ × 4200 × (100°-0°) + ¼ × 2256000 + ¼ × 2080 × (145°-100°)

Q= 15750 + 83425 + 105000 + 564000 + 23400

Q= 791575 J

Answer: The baking of a pizza should be categorized as an endothermic process because the dough absorbs heat. An endothermic process is a method that absorbs energy from its surroundings which is habitually in the form of energy

Explanation:

Answer:

endothermic; the dough absorbs heat

Explanation:

EDG2020

Answer:

Distancia = 925 metros.

Explanation:

Dados los siguientes datos;

Tiempo = 50 segundos

Velocidad = 18.5 m/s

Para encontrar la distancia recorrida;

Matemáticamente, la distancia viene dada por la fórmula;

[tex] Distancia = velocidad * tiempo [/tex]

Sustituyendo en la fórmula, tenemos;

[tex] Distancia = 18.5 * 50 [/tex]

Distancia = 925 m.

Por tanto, el cuerpo recorrió una distancia de 925 metros.

Answer:

option 2

Explanation:

Explanation:

An emulsion is a suspension of two liquids that actually do not mix together.these liquids that do not mix are said to be immiscible .an example :-

would be oil and water.lf you mix oil and water and shake them a cloudy suspension is formed

this is correct answer

I hope it's helpful for u....

Answer:

in heat transfer, as the fluid flows along the tube, the wall layers are heated or cooled. temp. variation occurs in the wall layers.

good luck :)

i hope this helps

have a great day !!

Answer:

Acceleration = 2.68 m/s² (Approx.)

Explanation:

Given:

Force  = 792 mN = 0.792 N

Mass = 295,000 mg = 0.295 kg

Find:

Acceleration

Computation:

Acceleration = Force / mass

Acceleration = 0.792 / 0.295

Acceleration = 2.68 m/s² (Approx.)

Answer:

The steepness of a hill is called a slope. The same goes for the steepness of a line. The slope is defined as the ratio of the vertical change between two points, the rise, to the horizontal change between the same two points, the run.

Answer:

Explanation:

Water vapor is when water molecules are present in the air, while steam is water heated to the point that it turns into gas. In simplified science, both are referred to as the gaseous state of water. Steam is usually white or translucent in nature, while water vapor can be clear or translucent.

Steam is simply, water vapor. Hence, the key difference between steam and vapor is that steam is the gaseous state of water whereas vapor is the gaseous state of any substance. Moreover, steam is typically invisible while the vapor of some substances is colorful.