What is the molecular formula of ammonia calcium carbonate.​

The concentration of Ca(OH)2 in the solution is approximately 1.33 x 10^(-6) M.

To find the concentration of Ca(OH)2 in a solution with a pH of 8.57, we need to use the concept of pOH, which is the negative logarithm of the hydroxide ion concentration ([OH-]). The pOH can be calculated by subtracting the pH from 14, which gives us 14 - 8.57 = 5.43.

Since Ca(OH)2 produces two OH- ions for every molecule of Ca(OH)2 that dissolves, the concentration of OH- ions will be twice the concentration of Ca(OH)2. Thus, we have [OH-] = 2x, where x represents the concentration of Ca(OH)2.

Taking the antilogarithm of the pOH, we find that [OH-] = 10^(-pOH) = 10^(-5.43).

Since [OH-] = 2x, we can write 2x = 10^(-5.43) and solve for x.

x = (10^(-5.43))/2 ≈ 1.33 x 10^(-6) M

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Answer:

The correct answer is B. Liquids have less energy than solids.  This is false because liquids have more energy than solids; the particles in a liquid are moving whereas the particles in a solid are almost still (they may vibrate slightly).  This increase in speed of particles translates to kinetic energy, showing us that liquids have more energy than solids.

Explanation:

We can also examine the other answer choices and show why they are incorrect.

Solids have a definite volume and shape.  Think about solids in your house; for example, think about a chair or a block.  The shape of these items cannot be changed, and their volume is unchanging.

There are no intermolecular forces between the particles of a gas. This is assumed to be a property of an ideal gas, which makes sense since the particles in a gas are farther from each other than those in a liquid or a solid.'

Sublimation occurs when a solid turns into a gas.  This is also a true statement; when a solid sublimes, it changes into a gas without ever becoming a liquid.

Hope this helps!

The balanced equation for the dissolution of silver chromate in water is: \(Ag2CrO4(s) ⇌ 2 Ag+(aq) + CrO42-(aq)\) The solubility product expression is: \(Ksp = [Ag+]2[CrO42-]\). Ksp js 1.5 x 10^-5 mol/L. The correct answer is option B

Let x be the molar solubility of \(Ag2CrO4\) in the presence of \(K2CrO4.\)Then, the equilibrium concentrations of Ag+ and \(CrO42-\) are both equal to 2x (since the stoichiometric coefficients are 2 and 1, respectively).

The concentration of \(CrO42- from K2CrO4\)  is 0.0050 M, which can be assumed to be constant as it is much larger than the molar solubility of \(Ag2CrO4.\) Therefore, the equilibrium concentration can be expressed as:

\([CrO42-] = 1.9950 M\). Substituting into the Ksp expression and solving for x:\(Ksp = (2x)2(1.9950)1.1 x 10^-12 = 4x^2x = 1.5 x 10^-5 mol/L\) .Therefore, the molar solubility of \(Ag2CrO4\) in the presence of 0.0050 M \(K2CrO4\) is \(1.5 x 10^-5 mol/L\)  Correct Answer is (B).

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While both the South African plain and marine ecosystems have biotic and abiotic factors that support life, the specific organisms and environmental conditions are very different due to the unique characteristics of each ecosystem.

What is Biotic factors?

Biotic factors are living organisms that shape an ecosystem. These include all living things, such as plants, animals, fungi, and bacteria, and their interactions with each other and with their environment. Biotic factors can influence the physical environment, such as by altering the availability of nutrients, or they can directly affect other living organisms through predation, parasitism, or competition.

Biotic factors:

The South African plain ecosystem is home to a variety of large herbivores, such as elephants, zebras, and antelopes, as well as predators like lions and hyenas. The marine ecosystem, on the other hand, is dominated by aquatic animals like fish, whales, dolphins, and sharks, as well as smaller organisms like plankton and algae.

Both ecosystems support a variety of bird species, although the types of birds may differ.

Abiotic factors:

The South African plain ecosystem is characterized by a hot, dry climate with seasonal rainfall. The soil is often sandy and nutrient-poor. In contrast, the marine ecosystem is characterized by a high salinity and a consistent temperature and pressure.

Both ecosystems may experience periodic droughts, although the effects on the organisms living in each ecosystem may differ.

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Recrystallization is a process used to purify solids. The three steps in the process are explained below:

1) Added ethanol to the reaction mixture to create a precipitate:

This is the initial step where ethanol is added to the mixture to dissolve the product that contains impurities. The addition of the solvent to the reaction mixture leads to the solubilization of the solid containing impurities.

2) Dissolved the precipitate by heating: Heating the solution evaporates the solvent and increases the solubility of the solid in the solution, leading to the formation of crystals. Solvent and solute must be able to dissolve each other in order to achieve this.

3) Allowed the solution to sit unperturbed for at least two days: During recrystallization, this step is very important since it allows the solution to cool down slowly, resulting in the formation of large crystals. The solution is kept sitting unperturbed until the crystals have fully formed and can be separated from the solution through filtration, giving a purified compound with high purity.

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Answer:

Explanation:

Heat moves from hot sand to the bottoms of your feet by conduction. Conduction is the transfer of heat between objects that touch each other.

Heat moves from hot sand to the bottoms of your feet by conduction.Hence Option (A) is correct.

Heat conduction is a phenomenon that occurs through the interaction of neighbouring atoms and molecules, transferring their energy/heat (partially) to their neighbours.

This is the most significant means of heat transfer within a solid and between solid objects in thermal contact.

Conduction is the transfer of heat between objects that touch each other.

Therefore, Heat moves from hot sand to the bottoms of your feet by conduction.Hence Option (A) is correct.

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Answer:

NH₄Cl    ⇄      NH₃   +    HCl

Explanation:

The formula equation shows a reversible reaction is:

NH₄Cl(s) ⇄ NH₃(g) + HCl(g)

Let's consider which formula equation shows a reversible reaction.

The single arrow indicates that this is an irreversible reaction.

The single arrow indicates that this is an irreversible reaction.

The double arrow indicates that this is a reversible reaction.

The single arrow indicates that this is an irreversible reaction.

The formula equation shows a reversible reaction is:

NH₄Cl(s) ⇄ NH₃(g) + HCl(g)

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In 100 ml of 0.15 m nitrous acid (HNO₂) are titrated with a 0.15 m naoh solution. pH for the initial solution is 2.04,  The pH for the point at which 80.0 ml of the base has been added is 3.85, pH for the equivalence point 8.06, and  ph for the point at which 105 ml of the base has been added is 11.56.

The nitrous acid reacts with NaOH as follows because it is a weak acid (Ka = 5.6x10⁻⁴):

HNO₂ + NaOH (l) = NaNO₂(aq) + H₂O

a. At first, there is only a 0.12M HNO₂ solution. As Ka is:

Ka = [H⁺] [NO₂⁻] / [HNO₂]

In the case where [H⁺] and [NO₂⁻] ions  originate from the same equilibrium ([H⁺] = [NO₂⁻] = x)

5.6x10⁻⁴ = X² / 0.15M

8.4x10⁻⁵ = X²

X = [H⁺] = 9.165x10⁻³M

As pH = -log [H⁺]

pH = 2.04

b. We currently have a buffer made up of HNO₂ and  NaNO₂ (the weak acid and conjugate base). The H-H equation is used to determine a buffer's pH:

pH = pKa + log [NaNO₂] / [HNO₂]

Where pH is the pH of the buffer,

pKa is -log Ka = 3.25

And [NaNO₂] [HNO₂] could be taken as the moles of each compound.

HNO₂  initial moles are as follows:

0.100 l x 0.15 mol/l. =0.015 moles

The additional moles of base are:

0.0800L x 0.15 mol/L = 0.012 moles

The moles of base added = Moles of NaNO₂ produced = 0.012moles.

The remaining moles of HNO2 are as follows:

0.015moles - 0.012moles = 0.003moles

Replacing in H-H equation:

pH = 3.25 + log [0.012moles] / [0.003moles]

pH = 3.85

0.15M / 2 = 0.075M

The NaNO₂ is in equilibrium with water as follows:

NaNO₂(aq) + H₂O(l) ⇄ HNO₂(aq) + OH⁻(aq) + Na⁺

c. All of the HNO₂ interacts at the equivalence point to produceNaNO₂. NaOH must be added in 100mL increments. Therefore, the NaNO₂ concentration is:

The equilibrium constant, kb, is:

Kb = Kw/Ka = 1x10⁻¹⁴ / 5.6x10⁻⁴ = 1.79x10⁻¹¹ = [OH⁻] [HNO₂] / [NaNO₂]

Where [OH⁻] = [HNO₂] = x

[NaNO₂] = 0.075M

1.79x10⁻¹¹ = [X] [X] / [0.075M]

1.34x10⁻¹² = X²

X = 1.16x10⁻⁶M = [OH⁻]

pOH = -log [OH-] = 5.94

pH = 14-pOH

pH = 8.06

d. The moles are now added an excess of 5 mL of NaOH, and they are:

5mL = 5x10⁻³L * (0.15mol / L) =7.5x10⁻⁴moles NaOH

In 100mL + 105mL = 205mL = 0.205L. [NaOH] = 7.5x10⁻⁴moles NaOH / 0.205L =

3.66x10⁻³M = [OH⁻]

pOH = 2.44

pH = 14 - pOH

pH = 11.56

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Cis-trans isomers are a subtype of geometric isomers in which two similar groups on the same atom are arranged differently in space. In the cis form, the two groups are on the same side of the molecule, whereas in the trans form, they are on opposing sides.

Using the structural formula of the following substances, we need to explain which ones can exist as cis-trans isomers:1-chloropropane: CH3CH2CH2Cl can have cis-trans isomers because the Cl atom is attached to the second carbon atom, and there are two different groups attached to that carbon atom.2-chloropropane: CH3CHClCH3 can have cis-trans isomers because the Cl atom is attached to the second carbon atom, and there are two different groups attached to that carbon atom.

1-pentene: CH3CH2CH=CHCH3 can have cis-trans isomers because there is a double bond between the 3rd and 4th carbon atoms, and there are two different groups attached to the carbon atoms adjacent to the double bond.2-pentene: CH3CH=CHCH2CH3 can have cis-trans isomers because there is a double bond between the 2nd and 3rd carbon atoms, and there are two different groups attached to the carbon atoms adjacent to the double bond.

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Answer:

1)conduction

2) convection

3) conduction

4) radiation

5) radiation

6) radiation

7) conduction

8) conduction

9) radiation

10) convection

Explanation:

not 100% sure

Answer:

Explanation:

why are some atoms radioactive?

the delicate balance of forces among particles keeps the nucleus stable. Any change in the number the arrangement or the energy of the nucleons can upset this balance and cause the nucleus to become unstable and create a radioactive atom

Answer:

If the temperature of the system is increased, then the equilibrium position would shift to the right side. According to Le Chatelier's principle, when a stress is applied to a system in equilibrium, the system will adjust itself to counteract the stress. In this case, increasing the temperature would be an external stress on the system, and the reaction would shift to consume more of the reactants, namely CH4 and H2S, to create more of the products, CS2 and H2, thus shifting the equilibrium position towards the products.

Explanation:

Answer:

4 valence electrons.

Explanation:

Answer:

i think its -91.6

Explanation:

2 ( - 950.8) - (( - 1130.7) + ( - 393.5) + ( - 285.8))

The standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.

The heat produced during a chemical reaction under specific conditions is known as the standard enthalpy change, abbreviated as H° (zero delta H). Standard conditions often refer to all reactants and products in their standard states, which are their most stable forms at 298 K and 1 bar (or 1 atm) pressure.

Hess's law, which states that the total enthalpy change of a reaction is equal to the sum of the enthalpy changes of its component phases, is used to calculate the standard enthalpy change of the reaction.

The following reaction is given:

\(\rm 2 NaHCO_3(s)--- > Na_2CO_3(s)+ CO_2(g) + H_2O(l)\)

The relevant enthalpy changes of formation are:

ΔH°[NaHCO3(s)] = -950.8 kJ mol⁻¹

ΔH°[Na2CO3(s)] = -1130.7 kJ mol⁻¹

ΔH°[CO2(g)] = -393.5 kJ mol⁻¹

ΔH°[H2O(l)] = -285.8 kJ mol⁻¹

By using Hess's Law, the standard enthalpy change (ΔH°) for the reaction can be calculated as follows:

ΔH° = Σ (products) - Σ (reactants)

ΔH° = [ΔH°[\(\rm Na_2CO_3\)(s)] + ΔH°[\(\rm CO_2\)(g)] + ΔH°[H2O(l)]] - [2 × ΔH°[\(\rm NaHCO_3\)(s)]]

ΔH° = [-1130.7 kJ mol⁻¹ + (-393.5 kJ mol⁻¹) + (-285.8 kJ mol⁻¹)] - [2 × (-950.8 kJ mol⁻¹)]

ΔH° = [-1809.7 kJ mol⁻¹] - [-1901.6 kJ mol⁻¹]

ΔH° ≈ -1809.7 kJ mol⁻¹ + 1901.6 kJ mol⁻¹

ΔH° ≈ 91.9 kJ mol⁻¹

Hence, the standard enthalpy change for the given reaction is approximately 91.9 kJ mol⁻¹.

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Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

Distance

Explanation:

The distance between the beginning of the first P wave and the first S wave tells you how many seconds the waves are apart. This number will be used to tell you how far your seismograph is from the epicenter of the earthquake. Measure the distance between the first P wave and the first S wave.

Answer:

Animals with large ears adopted to their environment to survive the harsh conditions of living, for example, the Fennec Fox adapts to it's living conditions by having big ears, the big ears allow for easier air flow of cool air.

Another adaptation is to store water in their bladders for later use, this allows them to cover up for the lack lf water in the desert.

Another adaptation is how their increased amount of fur keeps them warm in the night and at daytime, cool.

Lastly their ability to hunt at night makes it easier as the desert region is mostly cooler as opposed to daytime, this allowed them to easily hunt and prey for food.

Hope this helps

Answer:

They are positively charged

Explanation:

Hope it will help you

Protons are the sub-atomic particles present within the nucleus of the atom. The protons determine the atomic number and carry a positive charge. Thus, options c and d are correct.

Protons have been discovered as the smallest unit or particle of the atom. They are present in the nucleus of the atom situated in the middle along with the neutrons. The protons alone are the characteristics to determine the atomic number and property of the element in the periodic table.

The protons have also been discovered to have a positive charge (+1) on them that binds the atom and electron by the attractive forces. They are heavier than the other particles and are the determinant of the chemical element.

Therefore, options c and d. protons are equivalent to atomic numbers and carry a positive charge is correct.

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The correct order for molecules from most to least polar molecules is option 1, which is "CH₄ > CF₂Cl₂ > CF₂H₂ > CCl4 > CCl₂H₂". However, it is important to note that this is a long answer question, so let me explain why this is the correct order.

Polarity in molecules is determined by the electronegativity difference between the atoms in the molecule. Electronegativity is the measure of the ability of an atom to attract electrons towards itself. If the electronegativity difference between the atoms in a molecule is high, then the molecule will be polar. On the other hand, if the electronegativity difference is low, the molecule will be nonpolar.

Now, let's look at the molecules given in the options. CH4 is a nonpolar molecule because it has a tetrahedral shape and the electronegativity difference between carbon and hydrogen is very low. In contrast, CF2Cl2 is a polar molecule because it has a tetrahedral shape and the electronegativity difference between carbon, fluorine, and chlorine is significant. Similarly, CF2H2 is also polar because it has a linear shape and the electronegativity difference between carbon and fluorine is significant.

Moving on to the next molecules, CCl4 is nonpolar because it has a tetrahedral shape and the electronegativity difference between carbon and chlorine is low. Finally, CCl2H2 is also nonpolar because it has a linear shape and the electronegativity difference between carbon and chlorine is low.

So, the correct order for molecules from most to least polar is option 1, which is "CH₄ > CF₂Cl₂ > CF₂H₂ > CCl4 > CCl₂H₂"

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A 250 gram sample of water at the boiling point had 64.0 kj of heat added.  19.95 grams is the mass of water were vaporized.

The total quantity of matter that makes up every object or body is the greatest way to understand mass. Everything that we can see has mass. Examples of objects with mass include a table, a seat on your bed, a baseball bat, a glass, and the very air. The mass of a thing determines whether it is light or heavy.

45 kJ / 40.6 kJ = 1.1 moles

1.1 moles x 18 g per mol = 19.95 grams vaporized

Therefore,  19.95 grams of water were vaporized.

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Answer: 0.002 m³

Explanation:

We can use our unit conversions to find the volume in m³.

\(2L*\frac{1m^3}{1000L} =0.002m^3\)

water containing phenolphthalein will change from colorless to pink with the addition of a strong base. An alkaline substance, also known as a base, is a chemical compound that has a pH greater than 7.

Water containing phenolphthalein will change from colorless to pink with the addition of a basic solution. Phenolphthalein is an indicator commonly used to detect the presence of bases or alkaline substances. In an acidic solution or in pure water (pH below 8.2), phenolphthalein remains colorless. However, when a basic solution is added and the pH rises above 8.2, the phenolphthalein molecule undergoes a chemical change, resulting in a pink color. This color change is often used as a visual cue to indicate the presence of a base in a solution.

tI's important to note that phenolphthalein is not an accurate indicator for all pH ranges. It is only suitable for use in the pH range of 8.2 to 10.0. In solutions with pH values outside this range, phenolphthalein may not produce the expected color change.

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Answer:

(c)

Explanation:

in both black and red

Answer:

I think 3 im am not sure

Explanation:

Answer:

Solids, Gasses, Liquids

Explanation:

Solids are rigid structures that have a definite share and volume.

Gasses will continue to spread indefinitely until pressure prevents further spreading.

Liquids have a volume but take the shape of the container they are in.  

Answer:

Significant Figures in 200.0

Result 200.0

Sig Figs 4 (200.0)

Decimals 1 (200.0)

Scientific Notation 2.000 × 102

E-Notation 2.000e+2

Answer:

Cardiovascular they carry according to me