name any two chemical required for preparation of ammonia gas​

The mass of the original sample was 24 grams of a carbon-14 has a half life of 5730 years. after 17,190 years, only 3g remains.

Carbon-14 has a half-life of 5730 years, meaning that after that amount of time has passed, half of the original amount of carbon-14 in a sample will have decayed. After another 5730 years, half of the remaining carbon-14 will have decayed, leaving only 25% of the original amount.
So, after 17,190 years (3 half-lives), only 3g of carbon-14 remains. To find the original mass, we can work backwards using exponential decay.
Starting with 3g, we know that this is 25% of the original amount (since 17,190 years represents 3 half-lives). So, we can set up the equation:
3g = 0.25x
Where x is the original mass of the sample.
Solving for x, we get:
x = 3g / 0.25 = 12g
But wait - this is only the mass of the carbon-14 in the sample. To find the total mass of the sample, we need to consider that carbon-14 makes up only a small fraction of the overall mass of an object. Specifically, carbon-14 makes up about 1 part per trillion of the Earth's carbon.
So, we can set up another equation:
x / (1 trillion) = m
Where m is the total mass of the sample. Solving for m, we get:
m = x * (1 trillion) = 12g * (1 trillion) = 12,000,000,000g
Or 12 billion grams.
So, the conclusion is that the original mass of the sample was approximately 12 billion grams, or 12 million kilograms.

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Answer:

A. It causes rocks to change color

Explanation:

Weathering can be defined as the gradual decomposition of rock. This means, rocks are broken into pieces or sediments through the process of weathering.

There are two types of weathering process:

1. Physical weathering also known as mechanical weathering. This is the breakdown of rocks into smaller pieces without changing the composition of the rock. Physical weathering is caused by the action of ice, wind, plant growth.

2. Chemical weathering: Here, the rocks changes not just in size of pieces but in its composition. This is when other minerals are applied on the rock in other to dissolve it.

The oxidation of co (carbon monoxide) to less-harmful co₂ (carbon dioxide) and the oxidation of hc (unburned hydrocarbons) to co₂ (carbon dioxide) and h₂o (water).

Oxidation is that the loss of electrons during a reaction by a molecule, atom or ion. Oxidation occurs when the oxidation number of a molecule, atom or ion is increased. the other process is called reduction, which occurs when there's a gain of electrons or the oxidation state of an atom, molecule, or ion decreases.

The term oxidation was first employed by Antoine Lavoisier to signify the reaction of a substance with oxygen. Much later, it had been realized that the substance, upon being oxidized, loses electrons, and therefore the meaning was extended to include other reactions in which electrons are lost, no matter whether oxygen was involved.

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Answer:

8.2

Explanation:

To solve this problem;

 The concentration of [H⁺]   = 6.8 x 10⁻⁹mol/L

So, we need to convert this to pH:

           pH  = -log [H⁺]

So;

          pH  = -log 6.8 x 10⁻⁹ = 8.2

Answer:

Yellow

Explanation:

Thymol blue has a brownish-green or reddish-brown color and is a good pH indicator. It changes from red to yellow at a pH 1.2–2.8 ( acidic) and then from yellow to blue at a pH of 8.0–9.6( alkaline).

Nitric acid is a strong acid which means the pH indicator will change to yellow.

Answer:

the conjugate base of the compound is

C6h6O2/6-

Explanation:

subscript

The conjugate base of \(\rm HC_6H_6O_6^-\; is \; C_6H_6O_6^-\).

Conjugate acid is the acid that donates a hydrogen ion to a base, conjugate acid contains a hydrogen ion.

The base that gains a hydrogen ion from a conjugate acid is called the conjugate base.

The acid is NH4 converts into a conjugate base NH3-

When a conjugate acid donates a hydrogen ion, it converts into the conjugate base.

Thus, the conjugate base is \(\; C_6H_6O_6^-\)

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2moles of H2O are made when 6moles of HNO3 are consumed

75 mole of HNO3 produces = \(\frac{2}{6}\)× 75 ⇒ 25 moles of water

The limiting reagent is the reactant that is completely used up in a reaction and thus determines when the reaction stops.

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O

6 mole of HNO3 produces \(\frac{2}{6}\) = 2 moles of H₂O

1 mole of HNO3 produces =  mole of H₂O

∴ 75 mole of HNO3 produces = \(\frac{2}{6}\) × 75 ⇒ 25 moles of water

Answer:

The reaction of calcium metal with water to form calcium hydroxide and hydrogen gas can be represented by the following balanced equation:

Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g)

In this equation, "Ca" represents calcium metal, "H2O" represents water, "Ca(OH)2" represents calcium hydroxide, and "H2" represents hydrogen gas. The state symbols (s) , (l) and (aq) represent solid, liquid and aqueous state respectively.

This equation represents the transfer of electrons from the calcium metal to the water molecules, resulting in the formation of calcium hydroxide (a base) and hydrogen gas. The equation is balanced, with one calcium atom on the reactant side and one on the product side, and two water molecules on the reactant side and one calcium hydroxide molecule and two hydrogen atoms on the product side.

Explanation:

First, we need to rewrite the equation:

2K + 2H2O -> 2KOH + H2

This equation tells us that 2 moles of K react with 2 moles of H2O and produce 2 moles of KOH and 1 mole of H2.

If we have 43.7 grams of potassium, we can transform it into moles, compare with the ratio between Potassium and Hydrogen (H2) and then, calculate the quantity of hydrogen in grams.

So first, let's transform 43.7 grams of K into moles using the following formula:

moles = mass/molar mass

molar mass of K = 39.10 g/mol

moles = 43.7/39.10

moles = 1.12 moles

So:

2 moles of K --- 1 moles of H2

1.12 moles of K --- x moles of H2

2x = 1.12

x = 1.12/2

x = 0.559 moles of H2

Now let's transform moles into grams using the following formula:

mass = moles x molar mass

molar mass of H2 = 2.02 g/mol

mass = 0.559 x 2.02

mass = 1.13 g

Answer: It is produced 1.13 grams of H2.

Answer:

B.) Multicellular organisms are made of many cells and have specialized shapes that allow them to perform specific functions

Explanation:

Multicellular means that there is more than one cell.

Hope this helps!

Answer:

High melting point is answer

Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer:

1.8mL

Explanation:

What is the volume?

Density = Mass / Volume

19.3g/mL = 35g/v

19.3g/mL (v) = 35g/v (v)

19.3g/mL x v = 35g

v = 35g/19.3g/mL

v = 1.8mL

The number of aldol condensation reactions will occur in the process of forming the final product is c)two. So, correct option is c.

An aldol condensation is defined as the  condensation reaction in organic chemistry in which two carbonyl moieties either of aldehydes or of ketones react to form the β-hydroxyaldehyde or β-hydroxyketone

When benzil reacts with 1,3-dipehnylacetone,the reaction involved two ketones.

Both of ketones reacts separately with benzil. Due to that two times aldol condensation process occurs and due to two different ketones reacts with benzil, this reaction is called as cross-aldol condensation reactions.

A crossed aldol condensation is a reaction of two dissimilar carbonyl compounds containing α-hydrogen(s) which undergoes  aldol condensation.

Crossed aldol condensation reactions leads to four possible products as  carbonyl compound can also act as the nucleophile and in that case self-condensation is also possible, which makes a synthetically useless mixture

Hence, correct option is c.

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(Complete question) is:

when one molecule of benzil reacts with one molecule of 1,3-diphenylacetone, how many aldol condensation reactions will occur in the process of forming the final product?

a)zero

b)three

c)two

d)one

Answer:

Oxidation takes place at anode

Reduction takes place at cathode

In the equation Zn has changed to Zn2+. This means oxidation number of Zn has increased from 0 to +2. So Zn is oxidised.

In CuSO4 , Cu2+ and SO4 2- ions are present.

Cu2+ has changed to Cu(s) meaning oxidation number of Cu has reduced from +2 to 0. So Copper is reduced.

So Copper rod is the cathode since it has been reduced and Zn rod is the anode because it has been oxidised.

Also electrons always move from anode to cathode so that also shows us Copper is the cathode

Answer:

Explanation:

It goes through 2 half-lifes to get to 25%.  so its 14.75 h

When the engine's operating speed increases the temperature of the engine will also increase.

Given:

Automobile engines without a cooling system.

To find:

The affect on the temperature of the engine as its operating speed increases.

Solution:

The speed of the operating engine increases.

Velocity of object ∝ Kinetic energy of object...[i]

Kinetic energy  ∝ Temperature of object...[ii]

From [i] and [ii] :

Velocity of object ∝  Temperature of an object

So, from this, we can conclude when the engine's operating speed increases the temperature of the engine will also increase.

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The mutated amino acid at position 229 is arginine (Arg), and its substitution can potentially disrupt the 3D structure and alter the function of the protein due to changes in side chain properties and interactions.

Structure of the Amino Acids:

The wild-type amino acid at position 229 is not specified, so the structure cannot be provided.

The mutated amino acid is arginine (Arg), which has a side chain containing a positively charged guanidinium group.

Importance of the Position:

The specific position 229 in the protein sequence may be functionally significant, such as being involved in protein-protein interactions, binding sites, catalytic activity, or structural stability.

Without detailed knowledge of the protein, its function, and its structural context, it is difficult to determine the exact importance of this specific position.

Effects of the Mutation on Structure and Function:

The substitution of an amino acid at position 229 from the original to arginine can have various effects on protein structure and function.

Arginine's larger and positively charged side chain may introduce steric clashes or alter electrostatic interactions within the protein structure.

The mutation can potentially disrupt local or global protein folding, stability, or conformational changes, affecting its overall 3D structure.

The functional consequences of the mutation depend on the specific role of the amino acid at position 229, which can include changes in protein-protein interactions, enzymatic activity, substrate binding, or signal transduction pathways.

It is crucial to analyze the protein's structural context, available experimental data, and computational modeling techniques to gain a more accurate understanding of the specific effects of the mutation on the protein's structure and function in the given context.

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2-chloro-3-methyl-2-butene exhibits 3 1H NMR signals, while assuming both allylic methyl show as chemically equivalent in the NMR.

Nuclear magnetic resonance spectroscopy, commonly known as magnetic resonance spectroscopy (MRS) or NMR spectroscopy, is a spectroscopic technique for studying the local magnetic fields surrounding atomic nuclei.The sample is placed in a magnetic field, and the nuclear magnetic resonance NMR signal is generated by radio waves excitation of the sample's nuclei, which is detected by sensitive radio receivers. The resonance frequency can be changed by the intramolecular magnetic field of an atom in a molecule, revealing details about the electronic structure and different functional groups of the molecule. The sole accurate method for identifying monomolecular organic molecules in modern organic chemistry is NMR signals spectroscopy because the fields are distinctive or extremely specific to certain substances.

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Answer: The discovery of protons and isotopes

Explanation:  Mendeleev's arrangement by changing the criteria by which elements were arranged and assigned atomic numbers. Mendeleev arranged the periodic table based on the atomic mass of an atom of an element and its chemical properties.

The pH of a solution is the negative logarithm of the hydrogen ion concentration expressed in moles per liter.

pH is a measure of the acidity or alkalinity of a solution. It quantifies the concentration of hydrogen ions (H+) present in the solution. The pH scale ranges from 0 to 14, where a pH of 7 is considered neutral, pH values below 7 indicate acidity, and pH values above 7 indicate alkalinity.

The pH value is determined by taking the negative logarithm (base 10) of the hydrogen ion concentration. Mathematically, it can be expressed as pH = -log[H+], where [H+] represents the concentration of hydrogen ions in moles per liter.

By taking the negative logarithm, the pH scale becomes a convenient way to represent the concentration of hydrogen ions on a logarithmic scale, making it easier to compare the acidity or alkalinity of different solutions. Lower pH values indicate higher concentrations of hydrogen ions and stronger acidity, while higher pH values indicate lower concentrations of hydrogen ions and greater alkalinity.

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Answer:

Explanation:

Fractional distillation uses the different boiling points of the main elements of air. As the liquid air is heated, the elements change from liquid to gas and separate from one another. At this point, the carbon dioxide will become solid and drop from the cooled air, leaving nitrogen, oxygen and argon in the air.

Answer:

Fractional distillation

Explanation:

Answer:

Option A is correct (barite)

Explanation:

Given data:

Mass of  mineral = 51.00g

Volume of water = 50.0 mL

Volume of water + mineral = 61.4 mL

Density of mineral = ?

Solution:

First of all we will calculate the volume of mineral.

Volume of mineral = (volume of water + mineral) - Volume of water

Volume of mineral = 61.4 mL - 50.0 mL

Volume of mineral = 11.4 mL

Density of mineral:

d = m/v

d = 51.00 g / 11.4 mL

d = 4.48 g/cm³ (1mL = 1 cm³ )

Thus the mineral is barite.

The principle of faunal succession is a key concept in the study of prehistoric life and the age of sedimentary rocks. It is based on the idea that the fossilized remains of different species of animals and plants found in sedimentary rocks can be used to infer the relative age of the rocks and the conditions that existed when they were formed.

The principle of faunal succession states that over time, the species of animals and plants that lived in a particular area changed and evolved. As a result, the fossilized remains of different species found in sedimentary rocks can be used to infer the relative age of the rocks.

This principle is based on the idea that the fossil record is a record of the evolution of life on Earth. In addition, the principle of faunal succession also provides insight into the ancient environment and climate. For example, the presence of certain types of fossils, such as coral reefs or tropical plants, may indicate that the area was once a warm, shallow sea.

In all, the principle of faunal succession is a powerful tool that connects prehistoric life to the age of sedimentary rocks. By studying the fossilized remains of different species found in sedimentary rocks, scientists can infer the relative age of the rocks and the conditions that existed when they were formed.

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Answer:

Explanation:

a chemical reaction is a process in which the some substances go into reactant and some into products , the reactant molecule produce the new molecules in the form of product, it's also called the breaking of chemical bonds and forming the new bonds .

Answer:

c

Explanation:

a p e x :)

The charge an element would have if it lost or gained electrons. Hence, option C is correct.

Oxidation: The loss of electrons

Reduction: The gain of electrons

Oxidation number: the charge based on the number of electrons assigned to an atom as compared to the neutral atom.

Hence, the charge an element would have if it lost or gained electrons is the oxidation number.

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Answer:

D

Explanation:

Most of the fluids have some resistance to their movement due to viscosity. The gases also exhibit viscosity. The molecules that make up olive oil are larger as compared to alcohol. So olive oil has high viscosity. The correct option is D.

The viscosity of a fluid can be defined as the measure of a fluid's resistance to flow. It can also be known as the measure of a fluid's thickness or its resistance to the objects passing through it.

A fluid with high viscosity resists motion because of its strong intermolecular forces which gives high internal friction. The fluids can flow easily if they have very little intermolecular force of attraction. The SI unit of viscosity is poiseiulle (PI).

Here the molecules which make up the olive oil are found to be shorter than those which make up alcohol. So the oilve oil molecules have more resistance to sliding past one another.

Thus the correct option is D.

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If excess ammonium sulfate reacts with 20.0g of calcium hydroxide then liters of ammonia are produced at STP 0.081L

Ammonium sulphate is the organic solvent and the primary use of ammonium sulphate is as a fertilizer for alkaline soils

Here given reaction is

(NH₄)₂SO₄ + Ca(OH)₂ → CaSO₄ + NH₃ + H₂O

Here given data is

Calcium hydroxide  = 20.0g

We have to find liters of ammonia are produced at STP =?

20.0g of (NH₄)₂SO₄ STP = ?

Then 20.0g of (NH₄)₂SO₄×1 mol/132g×0.54L/1 mol = 0.081L

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