What Is The Total Number Of Moles Of Ions Produced By Dissolving 0.5 Mole Of Aluminum Sulfate, Al2(So4)3 (2025)

Answer:

Sr(NO₃)₂(aq) + Na₂CO₃(aq) ⇒ SrCO₃(s) + 2 NaNO₃(aq)

Sr²⁺(aq) + 2 NO₃⁻(aq) + 2 Na⁺(aq) + CO₃²⁻(aq) ⇒ SrCO₃(s) + 2 Na⁺(aq) + 2 NO₃⁻(aq)

Sr²⁺(aq) + CO₃²⁻(aq) ⇒ SrCO₃(s)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of strontium nitrate and sodium carbonate react. This is a double displacement reaction.

Sr(NO₃)₂(aq) + Na₂CO₃(aq) ⇒ SrCO₃(s) + 2 NaNO₃(aq)

The total ionic equation includes all the ions and the insoluble species.

Sr²⁺(aq) + 2 NO₃⁻(aq) + 2 Na⁺(aq) + CO₃²⁻(aq) ⇒ SrCO₃(s) + 2 Na⁺(aq) + 2 NO₃⁻(aq)

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

Sr²⁺(aq) + CO₃²⁻(aq) ⇒ SrCO₃(s)

Answer: Do understand building blocks of life, develop medicines, and so on.

Answer:

Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy, and clean air, water, and soil.

Explanation:

Answer:

The excited state electron configuration shows when an electron is excited and jumps into a higher orbital. For example, sodium in its excited state would have an electron configuration of 1s2 2s2 2p6 3p1, compared with its ground state of 1s2 2s2 2p6 3s1.

Explanation:

Answer:

asxrsse367721479009qqucinübjpnpnfzdh ilo h

Answer:

True

Explanation:

Answer:

56.0774g/mol

Explanation:

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what is the half life though?

Answer:

the number of moles is 0.279

Explanation:

The computation of the number of moles of calcium nitrate, is shown below;

We know that

Number of moles = mass of substance ÷ molecular weight

= 45.8 g ÷ 164.088

= 0.279moles

hence, the number of moles is 0.279

We simply applied the above formula so that the correct value could come

Answer:

Approximately 4.5 billion years ago, gravity pulled a dense cloud of interstellar gas and dust together to form our solar system.

At the center, gravity pulled more and more material in. Eventually, the pressure in the core was so great that hydrogen atoms began to combine and form helium, releasing a tremendous amount of energy. With that, our Sun was born, and it eventually gathered more than 99 per cent of the available matter.

Matter farther out in the disk was also clumping together. These clumps smashed into one another, forming larger and larger objects. Some of them grew big enough for their gravity to shape them into spheres, becoming planets, dwarf planets and large moons. In other cases, planets did not form because the asteroid belt is made of bits and pieces of the early solar system that could never quite come together into a planet. Other smaller leftover pieces became asteroids, comets, meteoroids, and small, irregular moons.

Answer:

l and t

Explanation:

because they are in group one

Answer:

L & T

since are found in the same group.

Divide the energy by Planck's constant, 6.626 x 10-34, to get the frequency of the wave. Divide the speed of light, ~300,000,000 m/s, by the frequency to get wavelength.

(wrong Subject Selection)

Answer:

B

Explanation:

the pH scale is based on the function

1x10-14

So since pH is neutral the concentration of OH and H must be equal hence the only option in which the concetration would [OH]{H}= 1x10-14 would be when both are equal so it cannot be a or d and when they are expressed in concetration so the only option is B.

The pH of the solution can be used to give the relation between the pOH and the hydroxide ion concentration. The concentration of hydroxide ions is 1 ×10⁻⁷. Thus, option B is correct.

What is pOH?

pOH is the measure of the hydroxide ion in the solution. The hydroxide concentration from pH is related as:

pH = - log [H⁺]

[H⁺] = 10⁻⁷

= 1 × 10⁻⁷

The hydroxide concentration from hydrogen concentration is calculated as:

[H⁺][OH⁻] = 1 × 10⁻¹⁴

[OH⁻] = (1 × 10⁻¹⁴) ÷ (1 × 10⁻⁷)

= 1 ×10⁻⁷

Therefore, option B. 1 ×10⁻⁷ is the hydroxide ion concentration.

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Answer:

1.Modern periodic table has eighteen (18) vertical columns. These are called groups

2.The elements are arranged in seven horizontal rows, in order of increasing atomic number from left to right and top to bottom. The rows are called periods, and they are numbered from 1 to 7

3.The second and third periods have eight elements each.

Answer:

The answer is B

Explanation:

Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom. Carbon Dioxide (CO2) is a gas with a molecular structure composed of two oxygen atoms and one carbon atom.

Hope this helps!

Answer:

Red litmus paper turns blue in the presence of a base

Red litmus paper turns red in the presence of a acid

Answer:

500.00

Explanation:

400+20+50+49+17+59

Explanation:

if we fix the temperature, we are just left with PV = constant for the gas law. So, in this situation, if the volume is doubled, the pressure must go down by one-half. And vice-versa. The simplest illustration of this would be a cylinder with a plunger on one end: if you push the plunger in so that the volume of the cylinder is halved and the temperature remains constant, then the pressure will double.

Answer:

According to Boyle's Law, an inverse relationship exists between pressure and volume. ... The relationship for Boyle's Law can be expressed as follows: P1V1 = P2V2, where P1 and V1 are the initial pressure and volume values, and P2 and V2 are the values of the pressure and volume of the gas after change.

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-Aphrodite

Explanation:

Answer:

E.F= OH

M.F=[tex]O_{2} H_{2}[/tex]

Explanation:

Empirical Formula

Step 1: Calculate mols of each element

0.44gH(1 mol H/ 1.008g H)= 0.4365 mol H

*note leave extra sig figs for calculations

6.92gO(1 mol O/ 16 g O)=0.4325 mol O

Step 2: Identify which is the smallest mol

*in this case 0.4365 mol H> 0.4325 mol O so we will use 0.4325 mol O

Step 3: Divide above calculations by the smallest mol

0.4325 mol O/0.4325= 1

0.4365 mol H/0.4325= 1.009 *rounds to 1

Step 4: use calculations as subscripts

Oxygen = 1 so the subscript will 1 (O)

Hydrogen = 1 so the subscript will 1 (H)

making E.F= OH

Molecular Formula:

Step 1: identify molecular mass and mass from the E.F

the molecular mass is given 34.00g/mol

the mass of the E.F is

(oxygen mass from periodic table)+(hydrogen mass from periodic table)

16+1.008= 17.008

Step 2:Divide the molecular mass by the mass given by the emipirical formula.

[tex]\frac{34.00}{17.008}= 1.999[/tex] round to 2

Step 3:Multiply the empirical formula (the subscripts) by this number to get the molecular formula. ANSWER: M.F=2(OH)- [tex]O_{2} H_{2}[/tex]

The most important factor to be considered in order for a radioisotope to provide accurate dating simply is:

The half-life should be similar to the age of the object.

The correct answer choice is option a.

Why half-life should be similar to the age of the object in determining accurate dating of a radioisotope.

Half-life of radioisotope helps in determining dating accurately simply because it helps to predict the amount of radioactive substance remaining after a given period of time.

In conclusion, it can be perfectly deduced from the explanation given above that the half-life of a radioisotope usually, frequently and most of the time helps to determine the rate at which these substances decay.

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Answer:

5.80

Explanation:

Answer:

Which phrase best describes wave motion? Movement of energy through space or a medium.

Explanation:

Answer option A.

Answer:

4.9 L O₂

General Formulas and Concepts:

Atomic Structure

Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 K

Stoichiometry

Using Dimensional Analysis

Explanation:

Step 1: Define

Identify variables

[Given] 6.4 g O₂ at STP

[Solve] L O₂

Step 2: Identify Conversions

[STP] 1 mol = 22.4 L

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of O₂: 2(16.00) = 32.00 g/mol

Step 3: Convert

[DA] Set up: [tex]\displaystyle 6.4 \ g \ O_2(\frac{1 \ mol \ O_2}{32.00 \ g \ O_2})(\frac{22.4 \ L \ O_2}{1 \ mol \ O_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 4.48 \ L \ O_2[/tex]

Step 4: Check

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

4.48 L O₂ ≈ 4.9 L O₂

Answer:

ionic compounds are made from metal and non mental elements

Explanation:

in this case it is know as an ionic compound because it contains a charge. For example, NaCl is simply a compound as it contains no charges (the charges cancel out as Cl is -1 and Na is +1)

but OH- is an ionic compound as it has a charge if -1 (O has a -2 charge and H has a +1 charge, so -2+1=-1 so OH has -1 charge)

Answer:

Final temperature = [tex]43.53^{\circ} C[/tex]

Explanation:

Given that,

Heat added, Q = 250 J

Mass, m = 30 g

Initial temperature, T₁ = 22°C

The Specific heat of Cu= 0.387 J/g °C

We know that, heat added due to the change in temperature is given by :

[tex]Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_2=\dfrac{Q}{mc}+T_1[/tex]

Put all the values,

[tex]T_2=\dfrac{250}{30\times 0.387}+22\\\\=43.53^{\circ} C[/tex]

So, the final temperature is equal to [tex]43.53^{\circ} C[/tex].

Answer:

Concrete

Explanation: