help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)

Answer:

0.0111 M

Explanation:

pH = 4.5

[H3O+] = ?

Relationship between both quantitiesis given by:

pH = -log₁₀ [H3O+]

-pH = log₁₀ [H3O+]

-4.5 =  log₁₀ [H3O+]

[H3O+]  = e ^ (-4.5)

[H3O+] = 0.0111 M

Answer:

b) Weeding is the process of growing weed

Explanation:

Wedding is an agricultural process carried out to ensure maximum you won't do. It is the process by which weeds i.e. unwanted plants are removed.

As rightly stated in the question;

- Weeding is either done by manual means e.g Cutlasses or use of weedicides, which are chemicals.

- Weeding is best done during tiling operations.

The incorrect option is that "Weeding is the process of growing weed" rather it is a process of removing weed.

Answer:

hey jazmin! I have been on your friends list for a while on brainly, I thought I'd say hi.

Answer:

(b) Mn2+ + 2 e- →2 Mn ℰ° = −1.18 V

Fe3+ + 3 e- → 3Fe ℰ° = −0.036 V

Answer:

Pulmonary oedema can be caused by lung disease, but when heart failure is more serious, the pressure of blood in the lungs builds-up, pushing fluid into the air sacs. This is how heart failure can lead to respiratory failure. People with pulmonary oedema will feel breathless, weak and unwell.

Answer:

The moon must be exactly crossing Earth's orbit of the sun for the full moon phase to be visible.

This is a situation where the Sun and the Moon are aligned on opposite sides of Earth with a corresponding illumination from the Sun.

It also occurs when the moon crosses the Earth's orbit of the sun and is denoted as option A.

Read more about Full moon here https://brainly.com/question/649027

#SPJ2

Answer:

Number of atoms in 5.9 g of N2 = 1.268 *10^23

Explanation:

Weight of one mole of N2 is 28.0134 g

In one mole of N2, number of atoms = 6.023 *10^23

Number of atoms in 28.0134 g (one mole) of N2 =  6.023 *10^23

Number of atoms in 1 g of N2 = 6.023 *10^23/28.0134

Number of atoms in 5.9 g of N2 = 6.023 *10^23/28.0134 * 5.9

= 1.268 *10^23

Answer:

C. Transpiration, evaporation, and sublimation.

Explanation:

thank you to the internet.

Respuesta:

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)

Explicación:

Consideremos la ecuación no balanceada que ocurre cuando cloruro férrico acuoso reacciona con carbonato de sodio sólido para formar carbonato férrico sólido y cloruro de sodio acuoso. Esta es una reacción de doble desplazamiento.

FeCl₃(aq) + Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Vamos a usar el método de tanteo. Empezaremos balanceando los átomos de C, multiplicando Na₂CO₃ por 3.

FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Luego, balancearemos los átomos de Fe, multiplicando FeCl₃ por 2.

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + NaCl(aq)

Finalmente, obtendremos la ecuación balanceada, multiplicando NaCl por 6.

2 FeCl₃(aq) + 3 Na₂CO₃(s) ⇒ Fe₂(CO₃)₃(s) + 6 NaCl(aq)

Answer:

A.  Engineers come up with scientific questions when they are developing their design, and scientists do research to answer them.

Answer:

I believe the answer is numbers

Explanation:

The ice melting would make more water because ice is water and if it melts it make water.

hope this helps :)

Answer:

here's the answer hope it helps

Answer:

A chemical reaction is a process in which the chemical bonds of a substance are broken or rearranged. One or more substances are formed with different properties because of this chemical reaction. Examples of chemical reactions are rust, combustion, and oxidation.

Answer:

El átomo podes 1 protón, 1 electrón y 2 neutrones.

Explanation:

Cada elemento químico se caracteriza por el número de protones de su núcleo, que se denomina número atómico Z. Es decir, el número atómico​ de un elemento químico es el número total de protones que tiene cada átomo de ese elemento.

Los protones poseen carga positiva y se encuentran en el núcleo, en torno al cual se mueven otras partículas con carga eléctrica negativa que son los electrones. Así, el átomo es eléctricamente neutro, ya que la carga positiva de los protones está compensada por la carga negativa de los electrones.  Entonces, en todo átomo neutro el número de protones del núcleo es igual al de electrones de sus orbitales.

En este caso, un átomo neutro tiene número atómico 1. Entonces la cantidad de protones y electrones presentes en el átomo es 1.

En el núcleo de cada elemento, además de protones, también es posible encontrar neutrones, cuyo número puede variar. La masa atómica (A) se obtiene sumando el número de protones y de neutrones de un núcleo determinado:

Número másico (A) = número de protones + número de neutrones

En este caso, el átomo neutro posee 1 protón y su número másico es 3. Entonces:

3= 1 + número de neutrones

Resolviendo:

3 - 1= número de neutrones

2= número de neutrones

Entonces, el átomo podes 1 protón, 1 electrón y 2 neutrones.

Answer:

NaCl

Explanation:

Na is the symbol of sodium. Cl is the symbol of chlorine

Answer:

10 nitrogens

Explanation:

The 2 is the number of nitrogens in a molecule of N2. There are 2 of them.

The 5 is a whole different critter. It tells you that it was part of an equation and it took 5 molecules of Nitrogen to balance the equation. You only see numbers to the right of a molecule when the molecule is in an equation.

5 (2)=10

=> the smallest particle of a chemical element that can exist.

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Answer:

0.12 dm^3 x (1 mol/24 dm^3) = ? mols N2

mols Cu = ? mols N2 x (3 mols Cu/1 mol N2) = ?

Then g Cu = mols Cu x atomic mass Cu = ?

Answer: Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

Explanation: I hope that was helpful!

Answer:

Lithium Cation is a monovalent cation that is metabolized much like sodium and is important in many cellular functions inside or on the surface of cells. lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals

The above reaction is a Single displacement reaction , in which lead (Pb) being more reactive displaces Copper (Cu) from its compound [tex](\mathrm{CuCl_2})[/tex] and forms Lead Chloride [tex](\mathrm{PbCl_2})[/tex].

[tex] \boxed{\mathrm{Pb + CuCl_2 \rightarrow PbCl_2 + Cu}}[/tex]

_____________________________

[tex]\mathrm{ \#TeeNForeveR} \: ☃[/tex]

Answer:

The answer is Ernest Rutherford.

Answer :

Good Luck

Answer:

[tex]V=6.2L[/tex]

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to realize that we need to use the ideal gas equation in order to calculate the volume of CO2 but firstly calculating the moles:

[tex]n=\frac{12.5g}{44.01g/mol}=0.284mol[/tex]

Then, we proceed with the ideal gas equation to solve for volume:

[tex]PV=nRT=\\\\V=\frac{nRT}{P}\\\\V=\frac{0.284mol*0.08206\frac{atm*L}{mol*K}*(45+273.15)K}{1.20atm}\\\\V=6.2L[/tex]

Regards!

Answer:

B. False is the rite answer

Answer: There are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].

Explanation:

Number of moles is defined as the mass of substance divided by its molar mass.

The molar mass of [tex]H_{2}O_{2}[/tex] is 34.01 g/mol. Hence, mass of hydrogen peroxide present in 16.95 moles is calculated as follows.

[tex]Moles = \frac{mass}{molarmass}\\16.95 mol = \frac{mass}{34.01 g/mol}\\mass = 576.46 g[/tex]

Thus, we can conclude that there are 576.46 number of grams present in 16.95 mol hydrogen peroxide [tex](H_{2}O_{2})[/tex].