Someone pls help me I will make you brain

Answer:

Cl

Explanation:

cl has mass number 35 and its atomic number is 17 so number of proton =atomic number 17 and number of neutron is =mass number -number of proton =35-17 =18

x21 +ANSWER

(i) Ne-22

(ii)1s2s22p6

(iii)21.3

An element X exists in three forms A, B and C in the ratio 1:2:3. If C has 10 protons and the number of neutrons in A, B and C are 10, 11 and 12 respectively,Give the following:(i) Representation of form C of the element X(ii) Electronic configuration of form B of the element(iii) Calculate the average atomic mass.

(i)C  has 10 protons and 12 neutrons so a mass of 10 +12 =22

element 10 is Neon (Ne) so this isotope is Ne-22

(ii) they all have the sane atomic number so the same number of electrons

with an electronic structure of 1s2s22p6

(iii) A weighs 20, B weighs 21, C weighs 22

the ratio is 1:2:3

weighted average weight is therefor

(1X20 +2X21 +3X22)/6 =21.3

Answer:

safety hand gloves face masks

Explanation:

Answer:

What are 3 physical properties of nitrogen?

Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume.

What are 2 chemical properties of nitrogen?

Elemental nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09 percent of Earth's atmosphere by volume. Nitrogen gas is an industrial gas produced by the fractional distillation of liquid air or by mechanical means using gaseous air.

Answer:

the law of multiple proportions, law of definite proportions, and law of conservation of mass.

Explanation:

(Hope this helps can I pls have brainlist (crown)☺️)

Answer:

2H+0 =H2O

Explanation:

May this help you

Answer:

X has 9 Electrons, 9 Protons and 10 Neutrons

X is Fluorine

Explanation:

19 in X is Nucleon number

So, if you minus 19 by 9 down there (which is proton number) you'll get 10 (Neutron number).

Now, Proton = Electron. That's why Electron is 9 too. I figured that X is Fluorine bcuz it has 9 Electrons. If you venture around in the periodic table, fluorine is the ninth element innit.

hope this helps ya ＼(^o^)／

Answer:

a new substance forms

Explanation:

Answer:

A new substance formed

Explanation:

Since the ethanol has a density of 0.800 g/mL, the mass of the ethanol is 180 grams.

Given the following data:

Volume of ethanol = 225 mL

Density of lead ball = 0.800 g/mL.

To find the mass of the ethanol;

Density can be defined as mass all over the volume of an object.

Mathematically, the density of a substance is given by the formula;

Density = Mass/Volume

Making mass the subject of formula, we have;

Mass = Density x Volume

Substituting the given parameters into the formula, we have;

Mass of ethanol = 180 grams.

Explanation:

integral proteins...nns

Answer:

2 homogenous mixture

Explanation:

Answer:

the anion of a salt is able to react with a H+ ion to form a weak acid, it can be removed from the solution by adding an acid. For CuBr adding H+ forms HBr and that is a weak acid; therefore, CuBr is more soluble in acid than in water:

Answer:

CoCI2 molecular weight is 129.84 g/mole

230 CoCI2 divided by the molecular weight

230 g/ 129.84 g/mole = 1.77 moles of CoCI2

Answer:

a molecule is a group of atoms/elements bonded together

Answer: Mg2+

Explanation:

Because only certain size electron orbits are allowable, the frequency and energy of the electron is quantized

According to the Bohr model of the atom, an electron moves from a lower to a higher energy level when it absorbs energy. This energy is released when the electron returns to ground state.

According to the Bohr model, only certain size electron orbits are allowable hence the frequency and energy of the electron is quantized.

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Answer:

There are four natural states of matter: Solids, liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. Solids.

Explanation:

Hope this helps you out!!

Answer:

Iron(III) oxide

Explanation:

Answer:

I think #3 might be the answer .

Because in #1 atomic mass tells mass .

#4 Atomic number doesnot only tell about the electrons atom has

Answer:

C:to the right side of the periodic table, and it is given

the suffix -ide.

The quantity of heat gained to raise the temperature from 25.0°C to 50.0°C is 10,450 Joules.

Given the following data:

To find the quantity of heat gained:

Mathematically, heat capacity or quantity of heat is given by the formula;

[tex]Q = mc\theta[/tex]

Where:

Substituting the values into the formula, we have:

[tex]Q = 100(4.18)(50 - 25)\\\\Q = 418(25)[/tex]

Quantity of heat = 10,450 Joules.

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Answer:

1g Hydrogen

Explanation:

Calcium in water reacts vigorously to give a cloudy white Precipitate (compound) called Calcium hydroxide alongwith the evolution of Hydrogen gas.

[tex] \boxed{ \mathsf{Ca + H_2O \rightarrow Ca(OH)_2 + H_2}}[/tex]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

This reaction is not in it's balanced form! The number of atoms of Hydrogen on the left is 2 while that on the right is 4,I.e.,they're not equal.

Adding a 2 in front of H2O solves the problem by making the number of atoms of each element on both the sides equal.

[tex] \mathsf{Ca +2 H_2O \rightarrow Ca(OH)_2 + H_2}[/tex]

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Looking into the equation more carefully, we see:

1 atom of Calcium reacts with 2 molecules of water to give 1 molecule of Calcium Hydroxide alongwith 1 molecule of Hydrogen gas.

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Mass of one atom of Calcium = it's gram atomic mass

= 40 g

Mass of one "molecule" of Hydrogen

= it's Gram molecular mass

= gram mass of one atom × number of atoms in one molecule

= 1 × 2

= 2 g

So,

according to our observation:

One atoms of Calcium gives one molecule of Hydrogen (during the particular reaction)

=> 40g of Calcium gives = 2g of Hydrogen

•°• 1 g of Calcium gives = [tex] \frac{2}{40} [/tex]

= [tex] \frac{1}{20} [/tex] g Hydrogen

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

We're provided with 20g of Calcium,

=> 20g of Calcium gives = 20 × [tex] \frac{1}{20} [/tex] g H2

= 1 g H2

_______________

Hope this helps!

Answer:

Well, SCl2 is known, so is disulfur dichloride… Cl−S−S−Cl …and BOTH these species are molecular… On the other hand, lithium chloride, an ionic salt, is decidedly non-molecular, and consists of an infinite array of lithium and chloride ions held together by strong electrostatic forces ….. and thus we would expect the salt to have the much higher melting point….

Answer:

1. Decomposition of stone due to acid rain.

3. The pink color of a rose.

Explanation:

Chemical changes always end up with new products in an equation, or it has always something to do with chemicals. Physical changes on the other hand, do not result in new products and it just changes the physical properties and physical state of matter of the object.

Yes,I agree that it is a redox reaction.

In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction.

A redox reaction is a reaction in which a substance is oxidized during the reaction whereas some other substance is reduced during the reaction, simultaneously.

The given chemical reaction is:

2K(s) + 2H20(l) arrow 2KOH(aq) + H2(g)

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Answer:

In the given reaction potassium metal is placed in water and when a reactive metal is placed in water, it reacts with water to form metal hydroxide and hydrogen gas, as a result, potassium hydroxide and hydrogen gas are produced in the reaction.

Explanation:

Answer:

I think that it it correctly balanced that is my opinion and, because  the way it is set up, that the answer will tell you weather or not it is correctly balanced or not.

Evaluating the number of atoms of each element on the product and reactant side, we can conclude that the student's equation isn't balanced.

Given the chemical reaction :

[tex] Al_{4}C_{3} + 6H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]

For a balanced equation, the number of atoms of each element in the product side must be equal to that on the reactant side.

Number of hydrogen :

Reactant side = (6 × 2) = 12

Product side = (6 × 2) + (6 × 2) = 12 + 24 = 24

Product side ≠ reactant side ; Hence, the equation isn't balanced

The balanced equation for the reaction goes thus :

[tex] Al_{4}C_{3} + 12H_{2}O ---> 3CH_{4} + 4Al(OH)_{3} [/tex]

Reactant side :

Al = 4

H = (12 × 2) = 24

O = 12

C = 3

Product side :

H = (6 × 2) + (6 × 2) = 12 + 24 = 24

Al = 4

O = 4 × 3 = 12

C = 3

Therefore, the student's equation isn't balanced, the balanced version of the equation has been given .

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