if the element A have three protons in the nucleus. find the atomic number of the element A​

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:

A

Explanation:

element is a pure substance consisting only of atoms

Answer:

Yes, the investigations will reach similar conclusions about the reactivity of H2 and Cl2

Explanation:

1. The law of multiple proportions says that when elements form compounds, the proportions of the elements in those chemical compounds can be expressed in small whole number ratios.  This means that regardless of whether 1000 times more of the products are used, the reactivity of the products is established by the chemical reaction

2. The law of multiple proportions is an extension of the law of definite composition, which states that compounds will consist of defined ratios of elements.

3. A reaction with more reactants will need more care because more products are produced, which can be toxic

4. H2 and Cl2 reactivity does not depend on the quantities but the chemical properties of each compound

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:

Molecular Formula :

(CaSO4)2.H2O or Ca2H2O9S2

Explanation:

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

Answer:

B and A.

Explanation:

Many of the great scientists were religious. But the answer is not D.

A scientist may have strong opinions. That was certainly true of Newton. Most of the time he was right. Still the answer is not C. Science requires an open mind.

The answer is between A and B. Many discoveries were made looking at the natural world. That may provide the inspiration. But I don't think it is the answer. I'm going to say A

B is the other answer. Between A and B many scientific truths have been discovered.

Answer:

Green vitriol- FeSO4·7H2O

white vitriol- ZnSO₄

Answer:

27

Explanation:

mass number A = atomic number z + number of neutrons = 13+14= 27

Answer:

Explanation:

27

Answer:

Explanation:

Your answer is C

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.

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Answer:

ans:Ne=2,8,1

ans:2,8,7

Answer:

60 sec

Explanation:

in 1.5km there is 60 unit of 25 meter so

Answer:

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

Explanation:

Answer:

It's C. Ethanol produces hydrogen when it burns

When burned, ethanol produces water and CO2.

Answer:  C

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

Answer:

105

Explanation:

1 nickel = 5 cents

5.25 dollars x 100 cents

= 525 cents

525 cents / 5 cents

= 105 nickels

Answer:

Boiling B.

Explanation:

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

[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:

C. Matter

Explanation:

Answer:

C. Matter

Explanation:

Matter is anything that occupies space(volume) and has mass.

Answer:

experiment

Explanation:

that is the answer

Answer:

The atomic model started out as a large single ball, then with electrons attached to it. It then became  "planetary model" with electrons orbiting at specific levels, and then later one with a nucleus or multiple different particles like protons and neutrons, and electrons orbiting at general (but not specifically predictable) areas.

Explanation:

thank u :)

Answer:

b. molecule, compound, pure substance

Terms that only describe carbon dioxide are molecule, compound, pure substance.

In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical composition of two or more elements in which their individual identities are vanished and it also mixed by solutions, suspension and colloids.A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.

In chemistry compound is combination of two or more different elements which are chemically bond. So compound is made up of  chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.

Therefore, terms that only describe carbon dioxide are molecule, compound, pure substance.

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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]

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.

Its B) Boron and Oxygen

The correct answer is B.

boron and oxygen have the same number of energy levels with electrons in them.

The energy level of an element is the region around the nucleus where its electron is likely to be, this corresponds to the period of the element in the periodic table.

Elements found in period 1, have one energy level.

Elements found in period 2, have two energy level.

Examples of elements found in period 2 include:

In the given options, only option B contains two elements with 2 energy level.

Thus, boron and oxygen have the same number of energy levels with electrons in them.

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Answer:

d

Explanation:

because nuclear charge ( no. of protons) increases

Answer:

First 20 Elements

Atomic Number Element Symbol

17 Chlorine Cl

18 Argon Ar

19 Potassium K

20 Calcium Ca