The formula of a salt is XCl2. The X-ion in this salt has 28 electrons. The metal X is

thermal conductivity

Answer:

Thermal conductivity

Explanation:

Any substance that is made up of only one type of atom or molecule is said to be a pure single  substance whereas substance that is made up two or more different elements or molecule is said to be a mixture.

Air: Different types of gases are present in air that is nitrogen, water vapors, oxygen etc. So, air is a mixture.

Ammonia gas: It consists of only one molecule namely ammonia throughout the substance so it is a pure single substance.

Hydrochloric acid: It is made up by dissolving hydrochloric gas in water so it is a mixture.

Salt water: It is mixture as water and salt are being mixed which are two different substances.

Hence, ammonia gas is a single substance.

The formula of ammonia gas is NH₃. Ammonia gas is a single substances of matter. It is a pure kind of substance which consist of single phase of matter.

A substance is pure if it contains only one type of constituent material. A pure substance is stuff with consistent properties across its entire surface. Atoms are incredibly microscopic particles that make up all stuff.

All that is in the air is a concoction of different gases. Nitrogen, oxygen, which is necessary for both human and animal life, carbon dioxide, water vapor, and trace amounts of other elements make up the atmosphere (argon, neon, etc.)

Salt water contain salt and water in it so, it is a mixture of two molecules. Air is the mixture of many gases. Hydrochloric acid is formed by the reaction of hydrogen and chlorine. so they are not on kind of matter.

Thus, the ammonia gas is a sample of matter which is present in single substance. option 2 is correct.

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The boiling point of the new compound increases while substituting a hydrogen atom with a halogen in a hydrocarbon ,therefore option (b) is correct .

The temperature at which substance change from liquid to the gaseous state is known as the boiling point.

The boiling point of a substance is the temperature at which both its liquid and vapor or gas states exist in equilibrium. Boiling point only occurs when heat is applied to the liquid substance.

It is also defined as the temperature at which liquid boils. The boiling point of water at sea level is 100∘C . It is equal to 373.15 on the Kelvin .

The boiling point of the new compound increases while substituting a hydrogen atom with a halogen in a hydrocarbon ,hence option (b) is correct .

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Answer:

B.

The boiling point of the new compound increases.

Explanation:

When a lid is placed on a pot of boiling water, water drops form all over the lid's inner surface. The vapors of water that are formed up on boiling escape in to the surroundings when there is no lid on the pot. When the pot is covered with a lid the gaseous water molecules condense on the cooler inner surface of the lid to form liquid water droplets. So, the best statement that describes the change in water vapor molecules as they change to liquid, a phenomenon called condensation, is that the change here is a physical change.

Paper chromatography is a tool frequently used in analytical chemistry to separate a homogeneous mixture into its components.

In paper chromatography the stationary phase is water which drenches the paper and the mobile phase is a mixture polar organic solvent and water. The various components of the homogeneous mixture is separated based on their relative solubility in either the mobile or stationary phase.

The number of orbitals that are completely full is 5.

The reason you may have thought it was 3 is because you're confusing orbitals with subshells.

In this electron configuration, the sub shells are:  1s^2, 2s^2, 2p^6, 3s^1

So, we have four sub shells.

Each sub shell consists of a specific number of orbitals. s subshells have one orbital, p subshells have three orbitals, d subshells have five orbitals, and f subshells have seven orbitals. Knowing this, we can look back at the electron configuration we were given and determine how many orbitals are filled.

1s^2 has one orbital, 2s^2 has one orbital, 2p^6 has three orbitals, and 3s^1 has one orbital. The first three subshells are completely full, so a total of five orbitals are full.

The number of orbitals that are completely filled in an atom whose electronic configuration is 1s²2s²2p⁶3s¹ is 5

Electronic configuration can simply be defined as the arrangement of electrons around the nucleus of an atom.

The electrons in an atom are arranged in orbital. These orbitals includes: s-orbital, p-orbital, d-orbital and f-orbital

S-orbital has 1 subshell = maximum of 2 electrons

P-orbital has 3 subshells = maximum of 6 electons

D-orbital has 5 subshells = maximum of 10 electrons

F-orbital has 7 subshells = maximum of 14 electrons

With the above information in mind, we can determine the number of orbitals that are completely filled in the atom given in the question above. This can be obtained as follow:

Electronic configuration => 1s²2s²2p⁶3s¹

1st shell => 1s² = 1 subshell = 2 electrons (complete)

2nd shell => 2s²2p⁶ => 4 subshells = 2 + 6 = 8 electrons (complete)

3rd shell => 3s¹ => 1 subshellsubshells => 1 electron (incomplete)

From the above illustration, we can see clearly that only 5 orbitals are completely filled.

Thus, we can conclude that the number of orbitals that are completely filled in an atom whose electronic configuration is 1s²2s²2p⁶3s¹ is 5

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Vertebrae hope that helps :)

18.4 * 10^9 lbs = (18.4 * 10^9)/2000 tons  

Cost = ((18.4 * 10^9)/2000 ) * 318  

Cost = $ 2925600000

Answer:

2'925.600'000.000‬ $ approximately 2,93 billion $

Explanation:

In order to get the total cost of the Phosphoric Acid produced, it's necessary to convert the Phosphoric Acid pounds into Tons using the given conversion and knowing that [tex]1 billion = 1'000.000'000.000[/tex] :

[tex]18.4 billon(lb) * \frac{1'000.000'000.000(lb)}{1 billon(lb)} *\frac{1(Ton)}{2000(lb)} =9.200'000.000(Ton)[/tex]

and knowing a Ton cost 318$ we can multiply by 318$ and get the result:

[tex]9.200'000.000(Ton) * \frac{318\$ }{1(Ton)} =2'925.600'000.000\$[/tex]

This is approximately 2,93 billion $.

Answer: Option (A) is correct.

Explanation:

In diphosphorus pentoxide there will be two phosphorous atoms and 5 oxygen atoms according to its name.

Therefore, the formula for diphosphorus pentoxide will be [tex]P_{2}O_{5}[/tex] and it is a solid.

Thus, the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide will be as follows.

                 [tex]P(s)+ O_{2}(g) \rightarrow P_{2}O_{5}(s)[/tex]

The correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide is:

A. P(s) + O₂(g) ⇒ P₂O₅(s)

Let's consider which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide.

Yes, this is the correct combination equation.

No, this is a decomposition equation. Also, elemental phosphorus is not diatomic.

No, since P₅O₂ is not diphosphorus pentoxide and elemental oxygen is diatomic.

No, since PO₂ is not diphosphorus pentoxide.

The correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form diphosphorus pentoxide is:

A. P(s) + O₂(g) ⇒ P₂O₅(s)

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Answer: The reason is the number of degenerate electrons.

Explanation:  Transition elements are the only elements in the periodic table which are capable of showing variable oxidation states.

Tranistion elements has 'd orbitals' as their penultimate shells which are not perfectly shielded by the inner orbitals. And these d orbitals can occupy 10 electrons in their 5 orbitals.

Thus they can easily lose electrons as the energy of the electrons are the similar or better say that they are degenerate.

Answer: atoms of the same element.

Justification:

There are two kinds of pure substances: elements and compounds.

Elements are pure substances consiituted by one kind of atoms. They cannot be divided into simpler substances either by physical or chemical means. This leads you to the answer of the question: atoms of the same element is not an example of compound, but of elements.

On the other hand, a compound is a chemical combination of two or more different atoms. The compounds can be splited into simpler substances (the elements) by chemical means.

Hence, second, third, and fourth choices are all examples of compound: they are pure substances of two or more kind of atoms.

You need to do something like that your self so sorry can help.

The correct electron configuration for Mn is 1s²2s²2p63s²3p64s²3d⁵.

The correct electron configuration for Mn is 1s²2s²2p63s²3p64s²3d⁵. This means that manganese has a total of 25 electrons. The electron configuration represents the distribution of these electrons into different energy levels and orbitals. In the case of Mn, the 3d sublevel is partially filled with 5 electrons.

The cat's displacement is forward 0.8 m

Since a cat jumps 1 m forward and then crawls 0.2 m backward. To find what is the displacement of the cat, we know that the total displacement of the cat is D = positive displacement + negative displacement

Now, since the cat jumps 1 m forward, this is positive displacement, d = + 1 m.

Also, since the cat crawls 0.2 m backward, this is negative displacement, d' = - 0.2 m

So, the total displacement of the cat D = d + d'

= + 1 m + (- 0.2 m)

= + 1 m - 0.2 m

= + 0.8 m

Since the forward direction is positive, the cat's displacement is forward 0.8 m

Given data:

1 kilogram = 1,000 grams

How many kilograms 1,830 grams?

Solution:

1000 grams = 1 kilogram

1 gram = 1/1000 kilograms

1,830 grams = 1/1000 * 1830 =  1.830 kilogram

                                              Hence  1,830 grams =  1.830 kilogram

Pure substances cannot be seperated by physical means.

Answer is: the molarity of HCl found in a titration is 0.1 M.

Balanced chemical reaction between hydrochloric acid and sodium hydroxide:

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l).

From balanced chemical reaction: n(HCl) : n(NaOH) = 1 : 1.

n(HCl) = n(NaOH).

c(HCl) · V(HCl) = c(NaOH) · V(NaOH).

c(HCl) = c(NaOH) · V(NaOH) ÷ V(HCl).

c(HCl) = 0.1 M · 50 ml ÷ 50 ml.

c(HCl) = 0.1 M; molarity of hydrochloric acid.

Given information:

Concentration of HCl = 0.035 M

To determine:

pH of the solution

Explanation:

Hydrochloric acid, HCl is a strong acid. It will completely dissociate to give H+ and Cl- ions

HCl → H+ + Cl-

Hence the concentration of H+ = Cl- = 0.035M

Now, pH measures the strength of H+ ions in a given solution. It is expressed as:

pH = -log[H+]

pH (HCl) = -log(0.035) = 1.46

Ans: pH of 0.035M HCl is 1.46

Answer:

A. buoyant force is equal to the weight of the object

Explanation:

An object floats when the buoyancy is equal to the weight of the object. According to Archimedes Principle for flotation, the weight of the object should be equal to the weight of the water displaced by the submerged part of the object. If the weight of the object is greater than the weight of the water displaced by the submerged part of the object, it will sink.

C is the correct answer choice.

Answer:

D

Explanation:

2MnO2 + H2O => Mn2O3 + 2OH is the correct balanced equation. All others are missing or have incorrect coefficients.

boyles law states that the volumes of a gas will decrease as pressure increases if the temperature remains constant.

charles law states that the volume of a gas will increase as temp increases if the pressure remains constant.

gay-lussacs law states that the pressure increases as temp increases if the volume remains constant.

moles has been the constant

No chemical bonding took place. The elements or compounds in the mixtures have no definite proportions.

Mixtures like sugar and water do not have a chemical formula because the substances in them retain their individual chemical identities and are not in a fixed ratio. Solutions of sugar in water are considered homogeneous mixtures and the sugar, sucrose or C12H22O11, is evenly distributed but does not chemically bond with water to form a new compound.

Mixtures such as sugar and water are not assigned a chemical formula because they do not form a new chemical compound with a fixed ratio of components. In mixtures, each substance maintains its chemical identity and the components are not in a fixed ratio, meaning you can mix them in virtually any proportion. This is different from a compound, where the elements are chemically bonded and always present in a specific ratio.

Take, for example, a solution, which is a type of homogeneous mixture where one substance is dissolved in another. Sugar dissolved in water forms such a solution. When sugar (sucrose) dissolves in water, the molecules of sucrose, C12H22O11, become evenly distributed among the water molecules, but no new compound is formed. Hence, the solution is represented as C12H22O11 (aq), indicating that it is an aqueous solution of sugar, not a new compound warranting a unique chemical formula.

In contrast, a compound like table salt (NaCl) is made of a fixed ratio of sodium (Na) and chloride (Cl) ions chemically combined, resulting in properties different from those of the individual elements. Compounds can only be separated into their elemental components through chemical reactions, not by physical processes like filtering or distillation.

Answer:

Percent by mass

Explanation: I think

Percent by mass represents the number of grams of a solute in 100 grams of a solution. This is because it is the mass of the solute divided by the total mass of the solution, multiplied by 100.

The option that represents the number of grams of a solute in 100 grams of a solution is Percent by mass. The definition of percent by mass in a solution, also known as mass percent, is the mass of the solute divided by the total mass of the solution, all multiplied by 100. Therefore, if you have a solution of 100 grams total, and you want to find out how many grams of solute you have in this solution, you would use percent by mass to calculate this.

Density, molarity, and volume have different uses and definitions in chemistry. Density is mass per unit volume, molarity is a measure of the concentration of a solute in a solution, and volume refers to the amount of space that matter occupies.

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Answer:- choice d is correct. Sr<Ca<Be .

Explanations:- Br, Ca, and Sr are all elements of same group as they all have 2 valence electrons. As we move down in a group, a new shell is being added that increases the size of the atom. As the size of an atom increases, it is easy to remove the electron from it's outer most shell in it's gaseous state. Since, Be is above Ca and Ca is above Sr. The size increases in the order, Be < Ca < Sr. It means Be is the smallest one of them and so it's hard to remove from it's outer most shell and hence it's ionization energy is higher.

Sr is largest one in these three elements and so it's easy to remove outer most electron from it that means the ionization energy is least. Ca is between Be and Sr.

So, an increasing order of ionization energy is Sr<Ca<Be . Choice D is correct.

Answer:

D.

Sr < Ca < Be

Explanation:

PLATO

granite is a harder n tougher rock than marble so

If granite and marble were exposed in an area with a hot and humid climate,

A.the marble would weather more rapidly.

Rock weathering by hot and humid climate is dependent on the rock's strength and hardness. Marble is weaker and softer than Granite. So A. the marble would weather more rapidly.

The normal condition of the mole of a gas is 22.44L.

The volume of CH4 = 8.9L

To get the number of moles we get,

8.9 / 22.44 = 0.397 moles.

The ratio of CH4 : H2O = 1: 2

The mole of water is 0.379 × 2 = 0.794 moles.

While we convert it into liters it will be

0.794 × 22.414 = 17.80L

The answer is 17.80 liters of water vapour which will be produced.

The correct answer is cyanate.

The polyatomic ion with the formula CN⁻ is called cyanate. A polyatomic ion has two or more atoms bonded together.

CN⁻ contains the cyano functional group wherein a carbon atom forms a triple-bond to a nitrogen atom. CN⁻ is a polyatomic anion that is present in inorganic compounds.

The polyatomic ion with the formula CN- is called cyanide.

cyanide is a negatively charged ion that is formed by the combination of a carbon atom and a nitrogen atom. The carbon atom has a valence of 4, and the nitrogen atom has a valence of 3.

When these two atoms combine, they share one of the electrons from the carbon atom with the nitrogen atom, resulting in a negative charge on the ion.

Cyanide is a very poisonous ion, and it can be fatal if ingested. It is also used in some industrial processes, such as the production of plastics and synthetic fibers.

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d) 1 and 4