For the reaction between aqueous calcium nitrate and aqueous sodium hydroxide producing the precipitate (solid) calcium hydroxide and aqueous sodium nitrate

(a) write a balanced equation for this reaction
(b) classify the reaction

The chemical equation for the decomposition of water is:

\(2 H_2O -- > 2 H_2 + O_2\)

To balance this equation, we need to count the number of atoms of each element on both sides of the equation.

On the left side of the equation, we have:

2 hydrogen atoms (2 H₂O)

2 oxygen atoms (2 H₂O)

On the right side of the equation, we have:

2 hydrogen atoms (2 H₂)

2 oxygen atoms (1 O₂)

We can see that the number of hydrogen atoms is already balanced, but the number of oxygen atoms is not. To balance the equation, we need to add a coefficient in front of O2 so that we have the same number of oxygen atoms on both sides.

The balanced equation is:

\(2 H_2O -- > 2 H_2 + 1 O_2\)

A compound is broken down into simpler compounds during a decomposition reaction. Different techniques, such as heating, exposure to light, or the inclusion of a catalyst, can be used to produce this reaction.

The reactant component splits into two or more products, which may be elements or compounds, during decomposition. A synthesis reaction, in which less complex substances join to create a more complex compound, is the antithesis of this reaction.

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Answer:

3.85 ×10²³ Na⁺ ions

Explanation:

Given data:

Mass of Na₂SO₄ = 45.6 g

Number of ions of Na = ?

Solution:

Number of moles of Na₂SO₄:

Number of moles = mass/ molar mass

Number of moles = 45.6 g/ 142.04 g/mol

Number of moles = 0.32 mol

1 mole of Na₂SO₄ contain 2 moles of Na⁺ ion.

0.32 mol × 2=  0.64  moles of Na⁺ ion

1 mole contain 6.022×10²³ Na⁺ ions

0.64 mol × 6.022×10²³ Na⁺ ions / 1 mol

3.85 ×10²³ Na⁺ ions

i When sodium carbonate (Na2CO3) is mixed with an aqueous solution of copper(II) sulfate (CuSO4), the student can expect to see several evidence of a chemical reaction:

Formation of a solid precipitate: When these two solutions are mixed, a solid precipitate of copper(II) carbonate (CuCO3) will form. This is a sign that a chemical reaction has occurred.

Change in color: The reaction between sodium carbonate and copper(II) sulfate will also result in a change in color. The solution may turn a blue or green color, indicating the presence of copper(II) ions.

Release of gases: The reaction between sodium carbonate and copper(II) sulfate may also produce gases, such as carbon dioxide (CO2).

ii The balanced chemical equation for the reaction between sodium carbonate and copper(II) sulfate is:

2Na2CO3(aq) + CuSO4(aq) → 2Na2SO4(aq) + CuCO3(s)

iii This is a double displacement reaction, also known as a metathesis reaction. In this type of reaction, the cations (positively charged ions) and anions (negatively charged ions) of the reactant compounds exchange places to form the products. In this case, the sodium ions (Na+) and the copper ions (Cu2+) exchange places to form sodium sulfate (Na2SO4) and copper carbonate (CuCO3).

1. C6H10O5 + 6O2 → 6CO2 + 5H2O

2. MgO + H2O → Mg(OH)2

3. 151.2444 grams of carbon dioxide are required to produce 3.44 moles of carbonic acid in the blood.

1. The complete, balanced chemical reaction for the burning of cellulose (C6H10O5), or wood, is:

C6H10O5 + 6O2 → 6CO2 + 5H2O

This reaction represents the combustion of cellulose in the presence of oxygen, resulting in the formation of carbon dioxide (CO2) and water (H2O).

2. The balanced equation for the reaction between magnesium oxide (MgO) and water (H2O) to produce magnesium hydroxide (Mg(OH)2) is:

MgO + H2O → Mg(OH)2

According to the equation, 1 mole of magnesium oxide reacts with 1 mole of water to produce 1 mole of magnesium hydroxide. Therefore, if 2.55 moles of magnesium oxide react, the same number of moles of magnesium hydroxide will be produced.

3. The balanced equation for the reaction between carbon dioxide (CO2) and water (H2O) to form carbonic acid (H2CO3) is:

CO2 + H2O → H2CO3

According to the equation, 1 mole of carbon dioxide reacts with 1 mole of water to produce 1 mole of carbonic acid. Therefore, if 3.44 moles of carbonic acid are produced, the same number of moles of carbon dioxide is required.

To calculate the mass of carbon dioxide, we need to know its molar mass, which is approximately 44.01 g/mol. Therefore, the mass of carbon dioxide required to produce 3.44 moles of carbonic acid is:

Mass = Moles × Molar mass

Mass = 3.44 moles × 44.01 g/mol

Mass = 151.2444 g

Therefore, 151.2444 grams of carbon dioxide are required to produce 3.44 moles of carbonic acid in the blood.

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The boiling point of benzene when the external pressure is 440 torr is 80.1 °C (176.2 °F).

What is benzene?

Benzene is an organic compound composed of six carbon atoms in a ring structure, with one hydrogen atom attached to each carbon atom. It is a highly flammable, colorless liquid with a sweet smell. Benzene is a natural component of crude oil and is one of the most important organic chemicals used in industry. It is used in the production of plastics, resins, synthetic fibers, rubber, pesticides, detergents, drugs, and dyes. It is also used as a solvent for fats, oils, waxes, resins, and inks. Benzene is classified as a carcinogen and its exposure can cause a variety of adverse health effects, including acute myelogenous leukemia, lymphomas, and other forms of cancer.

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Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq) correctly describes the dissociation of sodium sulfate into ions in an aqueous media

Dissociation reactions are those reactions in which a molecule dissociates into their constitute ions.

In the question, dissociation of sodium sulfate takes place as follow:

Na₂SO₄ (aq) → 2Na⁺ (aq) + SO4²⁻ (aq)

Above reaction shows the dissociation of Na₂SO₄ where in the right side sodium ion is present in the +1 oxidation state and sulfate ion is present in the -2 oxidation state.

Hence, option (a) is correctly describes the dissociation.

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Answer:

0.246 moles

Explanation:

Aluminum Sulfate is an ionic equation so we need to write the equation first with proper charges and subscripts:

Now that we know the ionic equation, we need to find the molar mass of Al_2(SO4)_3. There's 2 Aluminum's, each weighing 26.98 g/mol. There are 3 sulfates, each sulfate weighs 96.06 g/mol. We need to multiply the number of elements/compounds by their mass to get the total molar mass and then add them up (remember atomic mass = molar mass in g/mol):

We now know the molar mass of Al_2(SO4)_3 we need to find how many moles of it there are in an 84.2g sample. To do that, we need to do some dimensional analysis:

The grams of Al_2(SO4)_3 cancel so that we're left with moles of Al_2(SO4)_3 on top:

So in an 84.2g sample of Al_2(SO4)_3 (aka aluminum sulfate), there are 0.246 moles. This is correct because in one mole of Al_2(SO4)_3, there are 342.15g and the sample of 84.2 g of Al_2(SO4)_3 is way smaller than that, so our answer should be less than one mole, which it is.

I hope this helped!

The plants are disinfectant by adding chlorine. Hence, option A is the correct answer.

Chlorine is found to have disinfectant abilities when it is used on plants, so plants are disinfectant by adding chlorine. It helps to keep the plants safe from viruses and fungus. It operates by destroying the enzymes and genetic material of microbes by breaking the cell membrane.  

However, it is critical to apply chlorine at the optimum quantity and to thoroughly rinse it off to avoid any negative effects on the quality and safety of food products.

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The second ionization energy is always greater than the first one. So, the answer is between 1450and 6900 kJ/mol.

Each ionization energy means the energy that it takes to separate the outer electron from the atom. In this case, the best estimation of the second ionization energy is 6900 kJ/mol because it would take more than double the first ionization energy.

Therefore, the answer is d.

Taking into account the reaction stoichiometry, 1 mole of H₂ can be produced by reacting 2 moles of HCI.

In first place, the balanced reaction is:

Mg + 2 HCl  → MgCl₂ + H₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

By reaction stoichiometry 2 moles of HCl form 1 mole of H₂.

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The information from diagram shows the energy requirements needed in order for a reaction to

occur.

The collision theory states that each and every chemical reaction can occur between particles when the molecules collide each other.

The collision between particles is necessary but it is not sufficient for a reaction to take place. The collisions must be effective.

It is necessary to know the exact nature of an effective collision since this indicates whether particles react with each other and form new products.

According to collision theory, the reaction occur when molecules collide and molecules have sufficient activation energy to cross energy barrier.

Greater the energy, greater will be number of collision. Lesser energy, lesser will be number of collision.

Thus, the given energy diagram shows about the energy required for a reaction to take place.

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Answer: D) it shows the energy requirements needed in order for a reaction to occur.

Answer:

Option D is correct = 8.12 grams of NaCl

Explanation:

Given data:

Moles of sodium chloride = 0.14 mol

Mass of sodium chloride = ?

Solution:

Formula:

Number of moles = mass of NaCl / Molar mass of NaCl

Molar mass of NaCl = 58 g/mol

Now we will put the values in formula.

0.14 mol = Mass of NaCl / 58 g/mol

Mass of NaCl = 0.14 mol  ×  58 g/mol

Mass of NaCl = 8.12 g of NaCl

Thus, 0.14 moles of NaCl contain 8.12 g of NaCl.

Answer:

A.) 28

Explanation:

The mass number is the number of protons and neutrons within a particular atom. The charge of the atom is irrelevant because the mass number is not affected by the number of electrons.

Unless this atom is an isotope (different number of neutrons), there should be an equal amount of protons and neutrons.

As such, since the mass number is 56, there should be 28 protons and 28 neutrons (56 / 2 = 28).

Answer:

12ml should be the answer

Explanation:

From the balanced equation, we can see that the coefficient for the precipitate, Ba3(PO4)2, is 1. Therefore, the answer is (A) 1.

What is Precipitation?

Precipitation is a process by which a solid substance forms from a liquid solution. This typically occurs when two or more soluble substances are mixed together, and one of the resulting compounds is insoluble in the solvent (usually water) and forms a solid, which is called a precipitate.

The process of precipitation involves the formation of solid particles (precipitates) that are large enough to settle out of the solution. This can occur by several mechanisms, including the formation of intermolecular bonds or the formation of a new solid phase. Precipitation can be a desirable or undesirable process depending on the context in which it occurs.

To balance the equation, we need to make sure that there are an equal number of atoms of each element on both sides of the equation. We can do this by adjusting the coefficients in front of each compound.

The balanced equation for the reaction is:

3 Na3PO4 (aq) + 2 Ba(NO3)2 (aq) → Ba3(PO4)2 (s) + 6 NaNO3(aq)

From the balanced equation, we can see that the coefficient for the precipitate, Ba3(PO4)2, is 1. Therefore, the answer is (A) 1.

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Answer: The balanced equation is  4 NH3 + 7 O2  -->  4 NO2 + 6 H2O

Explanation:

Oxidation numbers

We begin by noting the oxidation numbers on each atom:

NH3:   N = -3, H = +1

O2:     O = 0

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

NO2:  N = +4, O = -2

H2O:  H = +1,  O = -2

From this we conclude that N has lost 7 electrons, while O has gained 2.

Half-reactions

Because this case is more complex, we must consider the half-reactions:

Eq. 1)  N^-3  -->  N^+4  + 7 e-        (which says that N has lost 7 electrons)

Eq. 2) O  + 2 e- --> O^-2                (which says that O has gained 2 electrons)

However, oxygen is a diatomic atom, so we must adjust the second equation by a factor of 2.

Eq. 1)  N^-3  -->  N^+4  + 7 e-

Eq. 2) O2  + 4 e- --> 2 O^-2

Balancing the Half-reactions

To balance the half-reactions, we must multiply each equation by a factor that allows us to cancel out the electrons. The LCM of 7 and 4 is 28, so we multiply the first equation by 4, and the second equation by 7, giving:

Eq. 1)  4 N^-3  -->  4 N^+4  + 28 e-

Eq. 2) 7 O2  + 28 e- --> 14 O^-2      

Now, adding them together gives:

4 N^-3  +  7 O2  --> 4N^+4  + 14 O^-2

All together...

To complete the reaction, we must add the missing hydrogen atoms. With 4 nitrogen atoms on the left, we require 12 hydrogen atoms to construct the 4 NH3 molecules. We will add 12 H to both sides:

4 N^-3  +  7 O2  --> 4N^+4  + 14 O^-2

 + 12 H                      + 12 H

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

4 N^-3 + 12 H + 7 O2  --> 4N^+4  + 14 O^-2 + 12 H

We can now combine all the atoms together into the known molecules on each side:

4 NH3 + 7 O2 --> 4N^+4 + 8 O^-2 + 12 H + 6 O^-2

which is,

4 NH3 + 7 O2 --> 4 NO2 + 6 H2O

Answer:

16

Explanation:

You will add the 3 atoms of carbon and hydrogen to make 6 atoms, for oxygen since we do atom count multiply 2 by 5 to get 10. Then add both total to get 16.

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The Correct expression is :

Answer:

i think the answer is A....

Explanation:

Igneous rocks (from the Latin word for fire) form when hot, molten rock crystallizes and solidifies. The melt originates deep within the Earth near active plate boundaries or hot spots, then rises toward the surface.

The element that helps the heart and is found in nuts and legumes is magnesium.

In this case, we are being asked about the element that promotes normal heart rhythm and muscle function and can be found in nuts, legumes, whole-grain products, and dark green vegetables. We have to know that this element is one of the key elements that are important to the health of a person.

Now we have to look at the options tat we have and see that magnesium is the element that is abundant in the nuts and the legumes and have been linked to the effective function of the heart.

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Answer:

Testing of thesis testing is used to determine the plausibility of a thesis.

The test assess the plausibility of the thesis of a sample data.

It occurs through different way, the first step is used to test the state the two suppositions.

In the coming step evaluation of data, third step include carry out plan and dissect the data.

The final step is to dissect the results of the data, it can moreover accept the thesis and reject the null thesis.

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Answer:

69.23g

Explanation:

Find out how many moles is in 9.89g of H2.

number of moles = mass(g) / molar mass

1 is the molar mass of hydrogen (to the nearest whole)

relative molecular mass of H2: 2*1 = 2

number of moles of H2 = 9.89/2 = 4.945

1 mol of H2 is produced from 2 mol of Li

so

4.945 mol of H2 produces 9.89 mol of Li

mass(g) = number of moles * molar mass

7 is the molar mass of Lithium (to the nearest whole)

mass = 9.89 * 7 = 69.23

69.23 grams of Li are needed to produce 9.89 of H2

Answer:

19.2 g

Explanation:

Step 1: Write the balanced equation

P₂O₅(s) + 3 H₂O(l) ⇒ 2 H₃PO₄

Step 2: Calculate the moles corresponding to 5.29 g of H₂O

The molar mass of H₂O is 18.02 g/mol.

5.29 g × 1 mol/18.02 g = 0.294 mol

Step 3: Calculate the theoretical yield of phosphoric acid, in moles

The molar ratio of H₂O to H₃PO₄ is 3:2. The theoretical yield of H₃PO₄ is 2/3 × 0.294 mol = 0.196 mol

Step 4: Calculate the mass corresponding to 0.196 moles of H₃PO₄

The molar mass of H₃PO₄ is 97.99 g/mol.

0.196 mol × 97.99 g/mol = 19.2 g

Answer:

The arrow symbol in a chemical equation separates the reactants from products. A chemical reaction is process in which chemical changes leads to the formation of products from reactants.

Explanation:

The correct answer is b. Ba.

To determine which element is the most likely identity of X, we can use the valency of nitrogen and the formula of the ionic compound X3N2.

Nitrogen has a valency of 3-, which means it forms an ion with a charge of -3. Therefore, in the ionic compound X3N2, the total charge of the cations (X3+) must be equal to the total charge of the anions (2N3-).

We can write the equation to express this relationship as:

3X+ + 2N3- → X3N2

Since the compound contains three X cations and two N anions, the cation X must have a charge of +2 to balance the overall charge of the compound.

From the list of elements given, only Ba (barium) has a 2+ charge, which makes it the most likely identity of X. Therefore, the correct answer is b. Ba.

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Calculations:

We are given the following parameters :

• Mass = 2.55kg = 2.55*1000= 2550

• T1 = 21°C

• T2 = 37°C

• Specific heat of water = c = 1cal/g°C

We will calculate q (heat ) as follows :