Please somone help me with a chemistry question brainliest to whoever answers correctly and 20 points

Answer:

HEY RUBY!! WE ARE BOTH FAILING!!!!!!!

Explanation:

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Answer:

4Al + 3O2 ----> 2Al2O3

Explanation:

first blank 4

second blank 3

third blank 2

you can explain your question i can help if i know it

Answer:

You could use red, blue, yellow, white, black, brown, green, orange, purple

Other useful colors:

Payne grey

Yellow or golden ocher

Titanium buff or raw titanium

Explanation:

Answer:

c ) a gymnast doing a cartwheel. ........

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Answer:I belive it would be attracted seeing as how there are more magmatic charges on that side of no 2 and how there are more positive charges on the middle side of ballon no1.

Explanation:

The three functions of the stem:

Answer:

3.7 atm

General Formulas and Concepts:

Atomic Structure

Gas Laws

Ideal Gas Law: PV = nRT

Explanation:

Step 1: Define

Identify variables

[Given] n = 0.68 mol H

[Given] T = 298 K

[Given] V = 4.5 L

[Given] R = 0.0821 L · atm · mol⁻¹ · K⁻¹

[Solve] P

Step 2: Find Pressure

Step 3: Check

Follow sig fig rules and round. We are given 2 sig figs as our lowest.

3.69705 atm ≈ 3.7 atm

Answer:None of the tunes make a correct statement the third choice is closed but may still dating the pencil operates broken because the light been to a zoo from a straight line when it across the boundary between air and water

Explanation:

Answer:(I)+3 N2(g) that is correct

Explanation:

The question is incomplete, the complete question is;

The lightest particle among the following is:

• Electron •Proton • Neutron • Alpha​

Answer:

Electron

Explanation:

There three basic subatomic particles are electrons, protons and neutrons. Both protons and neutrons are found in the nuclear and both contribute towards the mass of the atom. The alpha particle has the same mass as the helium nucleus.

However, the electrons are found in orbiit and have a negligible mass compared to the mass of the protons and neutrons. The mass of the electron is about 9.11 × 10^-31 Kg. This makes it the lightest of all the particles listed among the options.

Answer:

12.8 mL

Explanation:

the bolded bar indicates a count of 5. counting from there would add up to 8/10ths of a mL.

Answer:

D) Water is less dense as a liquid than as a solid because of changes in bond structure.

Explanation:

I hope I was able to help!

Have a nice day :)

The correct statements about water is that hydrogen bonding causes water to be strongly cohesive and is less dense as a liquid and solid.

It is bonding in between the hydrogen atom and most electronegative atoms like flourine, chlorine, oxygen atoms, etc.

Hence water is less dense as a liquid than as a solid because of changes in bond structure and hydrogen bonding causes water to be strongly cohesive.

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Answer:

En total son 8 modelos, en la explicación los nombraremos por orden de antigüedad.

Explanation:

Modelo atómico de Demócrito (450 a.C.)

Modelo atómico de Dalton (1803 d.C.)

Modelo atómico de Lewis (1902 d.C.)

Modelo atómico de Thomson (1904 d.C.)

Modelo atómico de Rutherford (1911 d.C.)

Modelo atómico de Bohr (1913 d.C.)

Modelo atómico de Sommerfeld (1916 d.C.)

Modelo atómico de Schrödinger (1926 d.C.)

Answer:

H =2; I = 2; J = 2  

Explanation:

Carbon is element 6 in the Periodic Table.  

Start at element 1 (H) and count from left to right until you reach element 6 (C).

You get the electron configuration

C: 1s² 2s²2p².

Thus,

H =2; I = 2; J = 2

Answer:

3.B,E,F and G

Explanation:

1.A,B,C and H

Answer:

4. B, C, F, and H

Explanation:

Answer:

b. A hydrogen sulfide molecule has lone pairs of electrons

Explanation:

The presence of lone pairs indictates that the molecule will be polar unless its molecular geometry is linear or square planar. In the case of H2S, its shape is bent due to the lone pair and it is a slightly polar molecule.

Answer:

c is the answer

step by step explanation is not

The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

Hence, option D is correct answer.

A double covalent bond is a type of covalent bond which involves the sharing of two pairs of electrons.

A covalent bond is a type of chemical bond that involves the sharing of electron pairs between the atoms.

Now lets check all options one by one

Option (A): CH₃Cl

In CH₃Cl carbon has 4 valence electrons and carbon shares its 1 electron each with three hydrogen atoms and carbon shares its 1 electron with chlorine. Here bonds are formed due to sharing of electrons between the atoms. Hence CH₃Cl is covalent bonded.

So, it is incorrect option.

Option (B): C₂H₃Cl

In  C₂H₃Cl, here two carbon atoms form double bond but they not form covalent bond.

So it is incorrect option.

Option (C): C₂H₂

In C₂H₂, each carbon has 4 valence electrons and each carbon shares its   one electron with each hydrogen atom here two carbon atoms are triple bonded.

So, it is incorrect option.

Option (D): C₂H₄

In C₂H₄, there are two carbon atoms and two hydrogen atoms, here two carbon atoms are double bonded.

So, it is correct option.

Thus, from above conclusion we can say that The formula which represent a hydrocarbon with a double covalent bond is C₂H₄.

Learn more about Covalent bond here: https://brainly.com/question/12732708

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Answer:

Explanation:

there must be equal number of carbons, hydrogen and oxygen between products and reactants

Resultant carbon dioxide passed through limewater in the right tube, producing a milky solution due to precipitation of the insoluble suspension of calcium carbonate: ... The milkiness disappears since calcium bicarbonate is water-soluble.

Answer:

[Ne]3s2

Explanation:

ahora tenemos que mirar cada una de las configuraciones electrónicas de cada átomo de cerca antes de tomar una decisión.

considerando la configuración electrónica más externa de cada una de las especies mostradas;

para la primera configuración, ns2 np6 corresponde a un gas noble.

para la segunda configuración ns2 np3 corresponde a un elemento no metálico del grupo 5.

para la tercera configuración, ns2 corresponde a un elemento metálico del grupo 2.

para la cuarta configuración, ns2 np4 corresponde a un elemento no metálico del grupo 6

Answer:

C. The final substance in beaker A is a pure substance while in Beaker B is a mixture

Explanation:

A pure substance is a substance that contains a constant and definite proportion of a single substance. Elements and compounds are the two known pure substances while mixtures are substances of different compositions mixed together.

In this question, two beakers; A and B are said to contain different substances. Beaker A contains elemental sulfur (S) that forms a yellow powder while beaker B contains sand and water. From the explanation above, the final substance in beaker A is a pure substance (element) while in beaker B is a mixture of sand and water.

Answer:I’m not sure

Explanation:free trial

From the formula of methane it is clear that one mole of methane has 4hydrogen atoms. So, 37.6×1023 hydrogen atoms are there in 25.0 g of methane. Therefore, 9.4×1023methane molecules and 9.4×1023 hydrogen and 37.6×1023carbon atoms are there in 25.0 g of methane.

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Answer:

they speed up

Explanation:

if you give more heat to a substance they gain more energy which makes them speed up. if you add more particles to a substance the particles gain more pressure which if inside a container can put more strain on the container

example - a balloon

the more air you put into a balloon, the more likely it is to burst because there are more particles colliding with the sides of the container and there is less space

if you put the balloon under a heat source it is more likely to burst because the heat gives the particles more energy which then makes them collide with the container more as they are moving around more

Answer:

the correct answer is zinc

Answer:

a. 408g de NH3 son necesarios

b. 2.42x10²³ moléculas de agua se obtienen

Explanation:

a. Basados en la reacción, 2 moles de NH3 producen una mol de (NH2)2CO. Para resolver esta pregunta debemos convertir la masa de (NH2)2CO a moles. Estas moles a moles de NH3 y su respectiva masa:

Moles (NH2)2CO -Masa molar: 60.06g/mol-

720g * (1mol / 60.06g) = 11.99 moles (NH2)2CO

Moles NH3:

11.99 moles (NH2)2CO * (2mol NH3 / 1mol (NH2)2CO) = 23.98 moles NH3

Masa NH3 -17.031g/mol-:

23.98 moles NH3 * (17.031g / mol) = 408g de NH3 son necesarios

b. 1mol de CO2 produce  1mol de agua. Se debe convertir el volumen a moles usando PV = nRT. Estas moles = Moles de agua. 1mol = 6.022x10²³ moléculas:

Asumiendo STP:

PV = nRT; PV / RT = n

Donde P = 1atm a STP

V = 9L

R = 0.082atmL/molK

T = 273.15K a STP

1atm*9L / 0.082atmL/molK*273.15K = n

n = 0.402 moles CO2 = Moles H2O

Moléculas:

0.402 moles agua * (6.022x10²³ moléculas / 1mol) =