Nguyên tố hoá học là gì

Answer:

Answer is 9.2 grams

Explanation:

Molar mass of ethanol

[tex]{ \bf{CH _{3}CH_{2}OH}} = (12 \times 2) + (6 \times 1) + (16) \\ = 46 \: g[/tex]

for moles:

[tex]{ \sf{1 \: mole \: of \: ethanol \: weighs \: 46 \: g}} \\ { \sf{0.2 \: moles \: weigh \: (0.2 \times 46) \: g}} \\ = 9.2 \: g[/tex]

Answer:

Bacteria has 1 cell and An Animal has multiple cells.

Explanation:

Bacteria is a cell its self. While An Animal, It has multiple cells that create multiple tissues, and those tissues create multiple organs, those organs make up an organ system. After the Organ System, it's an organism.

Organism = Animal, Human, Ect.

Meanwhile, Bacteria is made up ONE CELL (bacteria it's self is 1 cell)

So the answer is "Bacteria has 1 cell and An Animal has multiple cells."

I hope this helped!! <33

Answer:

60 sec

Explanation:

in 1.5km there is 60 unit of 25 meter so

Answer:

7 meters per second directly toward the reef

Explanation:

The barracuda swam for 8 seconds, and in 1/4 of that time it swam 14 meters, so:

8•1/4 = 2

The barracuda swam 14 meters in 2 seconds

Now, the velocity is the travelled distance divided by time, so:

14/2 = 7 meters per second

Answer:

Group B is the control group

Explanation:

In an experiment, a control group is the standard to which comparisons are made in an experiment.

Answer:

So, that if you put 100 mL of 30 degree water in a beaker, you could add up to 220 grams of sugar and it would eventually dissolve. In other words, that mass of sugar should dissolve in 100 mL of water to make a solution that is just saturated.

banetshegtsjegsgeheb

Answer:

Look up a picture of a periodic table, it will tell you all of it

Explanation:

Answer:

c

Explanation:

it becomes positively charged

Answer:

The atom becomes positively charged.

Explanation:

If ALL OF THE ELECTRONS are removed, then there are, no matter what, less electrons than protons in an atom. And, since the atom has less electrons than protons, it becomes positively charged.

Answer:

d

Explanation:

because nuclear charge ( no. of protons) increases

Answer:

Molecular Formula :

(CaSO4)2.H2O or Ca2H2O9S2

Explanation:

Component Compounds CID 962 (Water) CID 1118 (Sulfuric acid) CID 5460341 (Calcium)

Answer:

A

Explanation:

element is a pure substance consisting only of atoms

Answer:

Since, density is mass per unit volume, the density is the same.

The density of the marbles will depend upon their mass and volume, not on their count.

The density of an object is measured as the mass per unit volume. The average density equals the total mass of the object divided by its total volume.

The formula of the density of the material is expressed as follows:

Density = Mass/Volume

The S.I. unit of the density is Kg/m³. The density of a material is an intrinsic property as it doesn't depend on the size. If the size of the object increases, the mass increases as well but the density of material remains constant.

If the density of each marble is the same then the density of six marbles will be the same as the one marble because the density of marble is an intrinsic property. The density of marbles does not depend upon the number of marbles.

Learn more about density, here:

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Answer:

some of the main characteristics of a scientist are:

1. careful observation

2. curiosity

3. creativity

4. skepticism

5. objectivity

Explanation:

hope that helps>3

3

Explanation:

hopes it help you good luck

Answer: I believe you may have meant "ionization energy?" Yes, for a neutral element this is a measure of the energy required to remove a valence electron.

Explanation: See above.

By definition, The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

The electrons are attracted to the nucleus and it is necessary to provide energy to start them.

Ionization energy is the energy required to remove an electron from a gaseous atom, isolated and in a ground state. The electrons in the last shell, which are the weakest attracted to the nucleus, are always lost. In this way the neutral atom becomes a gaseous cation (positively charged ion).

The further away the electron is from the nucleus, the easier it is to remove it, that is, the less energy is needed.

Finally:

The energy required for the complete removal of 1 mol of electrons from 1 mole of gaseous atoms or ions is called Ionization energy. For a neutral element this energy is a measure of how easily the element forms an ion with a charge.

Learn more:

Answer:

First 20 Elements

Atomic Number Element Symbol

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca

Artificial products, medicines, and fertilizers are examples of chemistry discoveries that have had the greatest impact on the modern world. Polymer discovery has resulted in all the plastics and synthetic fabrics that surround us today.

Understanding how the properties of substances are related to their molecular structures allows chemists to design new molecules and materials with the desired properties, as well as develop or invent new types of transformations for carrying out the syntheses of these substances.

Chemistry is used in almost every aspect of today's automobiles, from the exterior paint, bumpers, and headlights to the interior seats, dashboard components, and seatbelts and airbags that protect passengers.

To name a few, industrial applications of chemistry have a direct impact on our daily lives: what we eat, what we wear, how we travel, the technology we use, how we treat illnesses, and how we get electricity. Chemistry research is constantly deepening our understanding and leading to new discoveries.

To learn more about the research in chemistry, follow the link;

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Answer:  C

Explanation:  Only one color (element) appears in C.  The other options have at least 2 colors.

Answer:

solutions is a homogenous mixture while colloids and suspensions are heterogeneous mixtures made up of 3 or more substances

Explanation:

homogeneous- made up of one thing

heterogeneous- made up of 2 or more things

Answer:

experiment

Explanation:

that is the answer

The position of element A is first group i.e. alkali metals whereas element B belongs to other groups.

It is because alkali metals reacts violently with water that leads to little explosion and also produced hydrogen gas while on the other hand, element B belongs to next groups in the periodic table. The reactivity of element A is higher than element B due to lack of one electron in the outermost shell which make it highly reactive as compared to element B which is less reactive in nature.

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Answer:

A is the correct answer.

[tex]\\ \sf\longmapsto FeSO_4(NH_4)_2SO_4.6H_2O[/tex]

[tex]\\ \sf\longmapsto 56u+32u+4(16u)+2(14u+4\times 1u)+32u+4(16u)+2(1u)+2(16u)[/tex]

[tex]\\ \sf\longmapsto 120u+64u+56u+64u+2u+32u[/tex]

[tex]\\ \sf\longmapsto 120u+120u+98u[/tex]

[tex]\\ \sf\longmapsto 240u+98u[/tex]

[tex]\\ \sf\longmapsto 342u[/tex]

Answer:

[tex]\huge\mathfrak\green{hola}[/tex]

Answer:

Approximately 13.4 meters per second (m/s)

Explanation:

We can divide the distance by 60 seconds to find the trains average rate of speed.

803.98 / 60 ≈ 13.4

Best of Luck!

[tex]\\ \rm\longmapsto 27.3g[/tex]

[tex]\\ \rm\longmapsto 27.3(1000)[/tex]

[tex]\\ \rm\longmapsto 273(100)[/tex]

[tex]\\ \rm\longmapsto 273100mg[/tex]

Explanation:

Difference between pulley and wheel and axle are:

pully = A pulley is a circular disc that has a groove around the circumference over which a rope or string can move. In the pulley, load is connected to one end of the rope and effort is applied on the other ends . The pulley that does not move up and down is called the fixed pulley.

Wheel and axle= Wheel and axle consists of two cylinders of different radii. The cylinder of large radius is called wheel and the cylinder radius is called axle . Both wheel and axle move together under the application of effort.

I have send you a photo of wheel and axle, pulley.

I hope it will help you so.

Answer:

Green vitriol- FeSO4·7H2O

white vitriol- ZnSO₄