6. How much water must be added to 600 mL of a 0.15 mol/L Ca(OH); solution
to make a solution with a concentration of 0.10 mol/L? (4 marks)​

The product that is a precipitate is ZnS(s), which will appear as a solid in the solution. A displacement reaction can be described as one in which a more active substance displaces a less active substance from its compound.

To predict the products, we need to use the double displacement reaction. When Na₂S (aq) and ZnSO₄(aq) are mixed together, they will exchange partners to form Na2SO4(aq) and ZnS(s).
Na₂S (aq) + ZnSO₄(aq) —> Na₂SO₄(aq) + ZnS(s).

A double displacement reaction can be described as a kind of chemical reaction in which the reactant ions exchange places to be new products. Usually, a double displacement reaction is present in the precipitate formation. The chemical bonds between the reactants may be either covalent or ionic.

You can learn more about the double displacement reaction: https://brainly.com/question/29307794

#SPJ11

In electrolysis the flow of electrons occurs from Anode (Positively Charged electrode) towards Cathode (Negatively charged electrode).

Therefore Diagram A shows the correct flow of electron in an electrolysis

Chemical decomposition produced by passing an electric current through a Electrolytic (Salt) solution containing ions.

Anode is located at the left hand side of the electrolytic cell where as cathode is located at the right hand side of the electrolytic cell.  

Therefore, In the given diagrams, Diagram A follows the above mentioned pattern.

Hence, It shows the correct direction of electron flow in an electrolytic cell.

Learn more about Electrolysis Here ;

https://brainly.com/question/12054569

#SPJ1

Answer:

1,103.47 milliliters

Explanation:

The total percentage of alcohol from solution A and solution B is 29. In a solution that is a mixture of solution A and B, the percentage of alcohol that would be contributed by solution A would be:--

                   11/29 x 100% = 37.93%

--while the percentage of alcohol that would be contributed by solution B would be:

               18/29 x 100 = 62.07%

Hence, if a mixture of A and B has 320 milliliters of alcohol, the amount of alcohol contributed by B would be:

                     320 x 62.07/100 =  198.624 milliliters

Now, remember that solution B is 18% alcohol. This means that the 18% alcohol content of solution B is 198.624 milliliters. Thus, the total volume of solution B would be:

                 198.624 x 100/18 = 1,103.47 milliliters.

Therefore, the total milliliters of solution B Amanda used would be 1,103.47.

Taking into account the definition of empirical formula, the complete chemical formula for the unknown compound is N₂O.

The empirical formula of a chemical compound shows the ratio between the atoms of the compound. That is, it indicates which elements are present and the minimum ratio in whole numbers between their atoms. The empirical formula is the simplest chemical formula for a chemical compound, which is why it is also called the minimum formula.

The empirical formula must be expressed using integer relationships, then to obtain this formula, divide the numbers of moles by the smallest result of them. In this case:

Nitrogen: \(\frac{5.2 moles}{2.65 moles}\)= 1.96 moles ≅ 2 moles

Oxygen \(\frac{2.65 moles}{2.65 moles}\)= 1 mole

Being the chemical formula of hte compound NxO, where x stands for a whole number, this indicates that the elements N and O are in the compound in a whole number ratio of x: 1.  Then, as in the empirical formula, the numbers of moles must be expressed in whole numbers, as previously calculated, the value of x must be 2.

In summary, the complete chemical formula for the unknown compound is N₂O.

Learn more about empirical formula and its difference with molecular formula: https://brainly.com/question/13058832?referrer=searchResults

the half-reactions

cathode : Zn²⁺ (aq) + 2e⁻ ---> Zn (s)  

anode : Mg (s) → Mg²⁺ (aq) + 2e−

a balanced cell reaction

Zn²⁺(aq) + Mg(s)→ Zn(s) + Mg²⁺ (aq)

Given

Zn and Mg electrodes

Required

The half-reactions for a galvanic cell

Solution

To determine the reaction of a voltaic cell, we must determine the metal that serves as the anode and the metal that serves as the cathode.

To determine this, we can either know from the standard potential value of the cell or use the voltaic series

1. voltaic series

Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au

The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent

So the metal on the left will easily undergo oxidation and function as anode

Since Mg is located to the left of Zn, then Mg functions as anode and Zn as a cathode

2. Standard potentials cell of Mg and Zn metals :

Mg2+ + 2e– → Mg E° = -2,35 V

Zn2+ + 2e– → Zn E° = -0,78 V

The anode has a smaller E°, then Mg is the anode and Zn is the cathode.

Answer:

Explanation:help

Answer:

B. Transfer energy to reaction center chlorophylls.

Explanation:

Accessory pigments absorbs sunlight, these compounds are found in photosynthetic organisms, which work in conjunction with chlorophyll. Acessory pigments absorbs and transfer light energy to reaction center chlorophylls.

A buffer solution of \(NH\)₃ and \(NH\)₄\(Cl\) with a pH of 9.25; adding \(KOH\) increases pH to 9.54; buffer capacity can be increased by adding components.

a. To find the pH of this buffer, we can use the Henderson-Hasselbalch equation:

\(pH = pKa + log([A^-]/[HA])\)

In this case, \(NH\)₃ is the base (A⁻) and \(NH\)₄⁺ is the conjugate acid (HA). The pKa can be calculated from the Kb:

\(Kw = Ka * Kb\\pKa + pKb = 14\)

\(pKa = 14 - pKb = 14 - (-log10(1.8x10\) ⁻ \(5)) = 9.54\)

Substituting the values into the Henderson-Hasselbalch equation, we get:

pH = pKa + log([A⁻]/[HA])

= 9.54 + log(0.20/0.24)

= 9.25

Therefore, the pH of this buffer is 9.25.

b. When 0.0050 moles of solid \(KOH\) is added to the buffer solution, it reacts with \(NH\)₄⁺ (positively charged ammonium ion) to form \(NH\)₃ and water:

\(KOH\) + \(NH\)₄⁺ → \(NH\)₃ + \(H\)₂\(O\) + \(K\)⁺

The number of moles of \(NH\)₄⁺ initially present in the solution is:

0.20 M x 0.500 L = 0.100 moles

Since 0.0050 moles of \(KOH\) are added, the remaining moles of \(NH\)₄⁺ is:

0.100 - 0.0050 = 0.0950 moles

The number of moles of \(NH\)₃ initially present in the solution is:

0.24 M x 0.500 L = 0.120 moles

Since \(NH\)₄⁺ and \(NH\)₃ react in a 1:1 stoichiometric ratio, the remaining moles of \(NH\)₃ are also 0.0950 moles.

The total volume of the solution is still 0.500 L, so the new concentration of \(NH\)₄⁺ is:

0.0950 moles / 0.500 L = 0.190 M

The new concentration of \(NH\)₃ is also 0.190 M since the number of moles of \(NH\)₃ and \(NH\)₄⁺ are equal.

Using the Henderson-Hasselbalch equation again, we get:

\(pH = 9.54 + log([0.190]/[0.190])\)

= 9.54

Therefore, the pH of the buffer after adding \(KOH\) is 9.54.

c. The buffer capacity can be increased by adding more of the weak acid and its conjugate base to the solution. This increases the concentration of both the acid and its conjugate base, which in turn increases the buffer capacity. The pH can be maintained by adjusting the ratio of acid to base in the buffer. Another way to increase the buffer capacity is to increase the total volume of the buffer solution, which dilutes any added acid or base and reduces its effect on the pH.

Learn more about buffer solutions at

brainly.com/question/24262133

#SPJ4

The answer is b. There is one lone pair of electrons on the central nitrogen atom in ammonia (NH3).To determine how many lone pairs of electrons are there on the central atom in ammonia (NH3),

the correct option is b.

Identify the central atom: In NH3, nitrogen (N) is the central atom. Determine the number of valence electrons: Nitrogen has 5 valence electrons. Account for the shared electrons: In NH3, there are 3 hydrogen atoms, each sharing 1 electron with nitrogen in a single covalent bond.

So, 3 electrons are shared. Calculate the lone pairs: Subtract the shared electrons from the total valence electrons. 5 (total valence electrons) - 3 (shared electrons) = 2 (lone pair electrons). So, the answer is that there is 1 lone pair of electrons on the central atom (nitrogen) in ammonia (NH3). Therefore, the correct option is b.

To know more about  nitrogen visit:

https://brainly.com/question/16711904

#SPJ11

The process of spectroscopy determines a substance's physical or chemical identity with as near absolute certainty as existing analytical techniques will permit.

Spectroscopy is the study of the interaction of electromagnetic radiation with matter and is a crucial tool in chemical analysis. By studying the spectrum of a substance (the way it absorbs, emits, or reflects light), spectroscopy can provide information about the composition, structure, and properties of the substance, thereby allowing for its identification with high accuracy.

Spectroscopy is a broad and interdisciplinary field that encompasses many different techniques for studying the interaction of electromagnetic radiation with matter. It plays a crucial role in various areas of science, including physics, chemistry, biology, and materials science. Spectroscopy provides information about the composition, structure, and properties of substances by analyzing the way they interact with light.

Learn more about spectrum here:

https://brainly.com/question/6836691

#SPJ4

The density of the unknown solid is approximately 109.864 lb/ft³. To convert the density from grams per cubic centimeter (g/cm³) to pounds per cubic foot (lb/ft³), we need to use appropriate conversion factors.

1 gram is equal to 0.00220462 pounds, and 1 cubic centimeter is equal to 0.0000353147 cubic feet.

First, let's convert the density from g/cm³ to kg/m³. Since 1 kg is equal to 1000 grams and 1 cubic meter is equal to 1,000,000 cubic centimeters, we can use the following conversion:

Density in kg/m³ = Density in g/cm³ × 1000 kg/m³ ÷ 1 g/cm³

Density in kg/m³ = 18.5 g/cm³ × 1000 kg/m³ ÷ 1 g/cm³ = 18500 kg/m³

Now, let's convert the density from kg/m³ to lb/ft³. Since 1 kilogram is equal to 2.20462 pounds and 1 cubic meter is equal to 35.3147 cubic feet, we can use the following conversion:

Density in lb/ft³ = Density in kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³

Density in lb/ft³ = 18500 kg/m³ × 2.20462 lb/ft³ ÷ 1 kg/m³ ÷ 35.3147 ft³/m³ ≈ 109.864 lb/ft³

Therefore, the density of the unknown solid is approximately 109.864 lb/ft³.

Learn more about density here:

https://brainly.com/question/29775886

#SPJ11

Answer:

Electric current

Definition:

The time rate of flow of electric charge, in the direction that a positive moving charge would take and having magnitude equal to the quantity of charge per unit time: measured in amperes.

Everything begins inside in the battery. The battery's zinc metal undergoes oxidation; here is where the flow of electrons into the conductors begins. Electrical field attraction will lead the wire's existing electrons to move towards the battery's positive terminal, and the loose electrons caused by the zinc metal will begin to fill the wire's empty spaces. process continues until the zinc metal's oxidation ceases. At rechargeable batteries, the oxidation-reduction process is also reversed by charging the battery, allowing the stored electrons in the positive terminal to flow back to the zinc metal's negative terminal.

#SPJ2

Answer:

QP

Explanation:

P has 9 electrons.

Electronic Configuration : 2, 7

Valence electrons : 7

P needs 1 electron to get stable electronic configuration.

Q has 3 electrons.

Electronic Configuration : 2, 1

Valence electrons : 1

P needs to loose 1 electron to get stable electronic configuration.

Q donates 1 electron,

Q -----> Q+ + 1 e-

P gains 1 electron,

P + 1 e- -----> P-

Q+ + P- -----> QP

This is an ionic compound.

Answer:

NaCl= ionic bond.

H2O=covalent bond.

Explanation:

NaCl:

Happens between metal and non-metal. since metal needs to lose an electron to get a full outer shell of electrons, sodium (Na) loses one electron and has a full outer shell of electrons.

chlorine is a gas so it needs to gain electrons to have a full outer shell. since it is in group 7, it needs to gain 1 electron for a full outer shell of electrons.

the lost electron from sodium is given to chlorine. this creates ions (a charged particle) so it is Na+Cl-. this creates a strong electrostatic attraction between the elements and causes them to join together in a lattice form.

H2O:

Covalent bonds happens between 2 gases. they share an electron or 2, and the bonds are very strong.

since oxygen needs 2 molecules to form a full outer shell. hydrogen have 1 atom in outer shell so they share the electron with the oxygen atom.

I can't fully explain why this is for H2O, but I hope you understand it.

The question asks about whether any solid Ag2CrO4 forms when 2.7 × 10⁻⁵ g of AgNO3 is dissolved in 15.0 mL of 4.0 × 10⁻⁴ M K2CrO4, given that Ksp of Ag2CrO4 is 2.6 × 10⁻¹².

Answer: No solid Ag2CrO4 forms when 2.7 × 10⁻⁵ g of AgNO3 is dissolved in 15.0 mL of 4.0 × 10⁻⁴ M K2CrO4.

The first thing to do is to write down the balanced chemical equation for the dissolution of AgNO3 and K2CrO4 in water: AgNO3 + K2CrO4 → Ag2CrO4 + 2KNO3So, 1 mole of AgNO3 reacts with 1 mole of K2CrO4 to produce 1 mole of Ag2CrO4.

Here, we will work in moles, and convert it to grams later.15.0 mL of 4.0 × 10⁻⁴ M K2CrO4 is equivalent to (4.0 × 10⁻⁴ mol/L) × (15.0 × 10⁻³ L) = 6.0 × 10⁻⁶ mol K2CrO4From the balanced chemical equation above, 6.0 × 10⁻⁶ moles of AgNO3 will react with 6.0 × 10⁻⁶ moles of K2CrO4 to produce 6.0 × 10⁻⁶ moles of Ag2CrO4.

The equilibrium constant for Ag2CrO4 is Ksp = [Ag⁺]²[CrO₄²⁻] = 2.6 × 10⁻¹².. Since Ag2CrO4 dissolves in water as Ag₂CrO₄ → 2Ag⁺ + CrO₄²⁻, and we are starting with no Ag⁺ ions or CrO₄²⁻ ions, so the molar solubility of Ag2CrO4 is s.

To calculate the molar solubility of Ag2CrO4, we must solve the following equation using the value of Ksp:Ksp = [Ag⁺]²[CrO₄²⁻] = (2s)²(s) = 4s³s = ∛(Ksp/4) = ∛(2.6 × 10⁻¹²/4) = 1.14 × 10⁻⁴ M.

The molar solubility of Ag2CrO4 is 1.14 × 10⁻⁴ M. This means that 1 mole of Ag2CrO4 will dissolve in 1 L of water to give a concentration of 1.14 × 10⁻⁴ M.AgNO3 is dissolved in a volume of 15.0 mL which is equal to 0.015 L. Therefore, the number of moles of AgNO3 is:(2.7 × 10⁻⁵ g)/(107.87 g/mol) = 2.50 × 10⁻⁷ mol.

Since we have equal molar amounts of AgNO3 and K2CrO4, which is 6.0 × 10⁻⁶ mol each, the K2CrO4 is in excess. Therefore, all the AgNO3 will react with the K2CrO4, and none will be left to react with Ag⁺ to form Ag2CrO4.

Thus, no solid Ag2CrO4 will form from this reaction.

To know more about solid visit:

https://brainly.com/question/28620902

#SPJ11

Answer:

6

Explanation:

2+2=6

Answer:

3.10 × 4.520 = 14.0

Explanation:

Sig Figs

3

Decimals

1

Scientific Notation

1.40 × 10'

According to the images in the question, it can be said that the letter A represents an element, B illustrates a molecule and C is a compound.

Molecules may be defined as the collection of two or more atoms that are significantly held together by numerous attractive forces known as chemical bonds.

An element may be characterized as the collection of identical atoms that remarkably possess some protons, neutrons, and electrons specifically.

While compound may be best characterized as a substance that is significantly constructed up of two or more unidentical chemical elements combined in a definite and fixed ratio.

Therefore, the letter A represents an element, B illustrates a molecule and C is a compound.

Learn more about Molecules here:

https://brainly.com/question/1446104

#SPJ1

When silicon bonds to an electronegative element, sulfur, phosphate, and silicon all expand their octets (yellow, red, and green).

The chemical production relies on nitrogen. It is used to create explosives, nylon, nitric acid, herbicides, and colors. Nitrogen needs to first be combined with hydrogen to create urea in order to create these products. The Haber process is used for this.

The atmosphere is the major source of nitrogen. It is made composed of this harmless, colorless gas in 78 percent of its structure. Nevertheless, because nitrogen is present in the atmosphere, plants cannot use it.

To know more about nitrogen visit:

https://brainly.com/question/16711904

#SPJ1

Answer:

D

Explanation:

The front shown in item A differs from that shown in item B because: D. Two air masses form a boundary in item A while warm air rises above cold air in item B.

An occluded front can be defined as a composite weather front that is typically formed during cyclogenesis, which eventually causes a cold front to overtake a warm front and thereby, forcing it aloft with respect to air masses.

This ultimately implies that, an occluded front causes warm air to be mostly separated from a cyclone center that is experienced at the surface of planet Earth.

Read more on air here: https://brainly.com/question/24730207

Vitamins and Minerals

Micronutrients, often known as vitamins and minerals, are essential for healthy growth, illness prevention, and overall well-being. Micronutrients, apart from vitamin D, are not generated by the system and must be obtained from food. Even though humans only require trace levels of micronutrients, ingesting the required quantity is critical. Micronutrient deficits can be life-threatening. At least the majority of all children under the age of five suffers from deficiencies of vitamins and minerals.

Despite the fact that humans only require modest levels of micronutrients, it's crucial to eat the suggested quantity. Devastating repercussions can result from micronutrient deficits. Around the world, at least 50% of children under the age of five have vitamin and mineral deficiencies.

To know more about micronutrients refer to https://brainly.com/question/6974286

#SPJ4

Answer:

The two or more important products are :-

1. 3 methlcycodexene

2. 1 methlylcohexene(2pt)

Answer:

V₂ = 15.27 L

Explanation:

Given data:

Initial volume = 14.0 L

Initial temperature = 25°C (25 + 273.15 = 298.15 k)

Final temperature = 52°C = (52+273.15 = 325.15 k)

Final volume = ?

Solution:

Charles Law:

" The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure "

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

V₂ = V₁T₂/T₁  

V₂ = 14.0 L × 325.15 K / 298.15 k

V₂ = 4552.1 L.K / 298.15 K

V₂ = 15.27 L

Answer: Inertia

Explanation:

Ana is engaging in constructive play according to Parten's classification.

This type of play involves using objects or materials to create something, such as building with Legos. It allows children to explore their creativity and develop problem-solving skills as they plan and execute their construction.

Constructive play is also beneficial for developing fine motor skills and hand-eye coordination. It is often seen in children between the ages of 3-6, which is the age range that Ana falls into as a preschooler. Through constructive play, Ana is not only having fun but also learning valuable skills that will benefit her in various aspects of life.

More on constructive play: https://brainly.com/question/16027907

#SPJ11

Answer:

kwkrofofoxosowoqoaododpdprofpcoxozoskawkdjdn

Explanation:

sklwlrlfclxoskkekrdododosoekekrkrododowoekekfkdodkwkeororkdkdkwejrjrkfidiwi3jr

There are 11.79 grams of oxygen gas in 8.25 liters of oxygen gas at STP.

To convert from liters to grams of a gas, we need to know the density of the gas at the given temperature and pressure.

The density of oxygen gas can vary depending on its temperature and pressure, but at standard temperature and pressure (STP), which is 0 °C and 1 atm pressure, the density of oxygen gas is 1.429 g/L.

Therefore, to find the mass of oxygen gas in 8.25 L at STP, we can use the following equation:

mass = volume x density

mass = 8.25 L x 1.429 g/L

mass = 11.78825 g

Learn more about oxygen gas at:

https://brainly.com/question/18609914

#SPJ1

Answer:

16 years = 5840

Explanation:

multiply the time value by 365

Answer: Endothermic Reaction

Explanation: