6. What is one way a star with much more mass than the sun can end up?
white dwarf
red giant
neutron star
red dwarf

The statement that a physical change is a change in matter's form without a corresponding change in its chemical properties is valid.

Physical modifications examples include:

1. changing a substance's condition, like when ice melts to form liquid water or when water boils to form steam

2. altering a substance's dimensions or shape, such as by sawing a piece of wood or shattering a glass

3. combining two or more things, as when you swirl sugar into coffee

4. separating a combination into its constituent elements, as when sand is filtered out of water.

A physical change does not affect the material's atoms or molecules, and the chemical property composition of the substance does not change. By undoing the physical transformation, such as by turning liquid water into ice, the substance can be returned to its former state. It's vital to remember that some changes, like rusting, burning, or rotting, may appear to be physical changes but are actually chemical changes. These alterations in chemical composition and attributes occur as a result of a chemical reaction in which the original ingredients are changed.

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Question - A physical change is a change of matter from one form to another without a change in chemical properties. State true or false.

The bond energy per mole for breaking all the bonds in methane, CH4, is 1288 KJ mol.

Bond energy is the energy required to break a chemical bond, and breaking all the bonds in methane requires a total of 1288 KJ mol of energy.

Bond energy is calculated by subtracting the total enthalpy of the products from the total enthalpy of the reactants. In the case of methane, the reactants are CH4 and the products are H2 and C.

The bond energy of methane is calculated by subtracting the total enthalpy of the products from the total enthalpy of the reactants. When the bonds in CH4 are broken, energy is released and the total energy released is 1288 KJ mol. This energy is known as the bond energy of methane.

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First, we write down our reaction:

N2 + 3H2 → 2NH3

Don't forget to balance it.

We only use moles as units.

Procedure:

3 x 1 mole H2 ------------ 2 x 1 mole NH3

3.1 moles H2 ------------- x

x = 2.1 moles NH3 are produced

Answer: 2.1 moles NH3

Uranium is a radioactive substance, which is extremely reactive. As a consequence, it cannot be found in the environment in its elemental state. During uranium, mining disturbances can influence both the quality and quantity of the surface water.

Several of the effects of uranium mining are identical to those experienced in other kinds of mining.

Due to the harmful effects of radioactive substances, the uranium mining for the use of nuclear energy has the greatest environmental influence.

Answer: C

Explanation:

Don’t trust the other person it’s not A

*view photo for answer*

pay attention! the answer choices aren't always in the same order!

To determine the number of grams of KClO₃ formed when 50.0 g of KCl reacts with 50.0 g of O₂. Molar mass of KClO3 = 122.55 g/mol

Next, we need to determine the limiting reactant. The limiting reactant is the reactant that is completely consumed and limits the amount of product formed. We can do this by comparing the moles of each reactant.To calculate the moles of each reactant, we divide the given mass by their respective molar masses:

Moles of KCl = 50.0 g / molar mass of KCl

Moles of O₂ = 50.0 g / molar mass of O₂

Molar mass of KCl = molar mass of K ₊ molar mass of Cl

Molar mass of O₂ = 2 ₓ molar mass of O

The reactant that produces fewer moles of KClO₃ is the limiting reactant..Finally, to calculate the grams of KClO₃ formed.

Grams of KClO₃ = moles of KClO₃ * molar mass of KClO₃

Molar mass of KClO₃= 122.55 g/mol

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Answer:

16

Explanation:

the number a grams is 16

Answer:

Roughly 471.96589800000004. Hope i helped :D

Explanation:

HF and CH₃OH are molecules that  does not contain hydrogen bonding intermolecular attractive forces.

Option B and D are correct.

Unlike a covalent bond to a hydrogen atom, hydrogen bonding is a distinct type of dipole-dipole attraction between molecules. It results from the appealing power between a hydrogen particle covalently clung to an extremely electronegative iota like a N, O, or F molecule and another exceptionally electronegative molecule.

Intermolecular hydrogen bonding and intramolecular hydrogen bonding are the two main types of hydrogen bonds that have been discussed. The majority of intermolecular hydrogen bonding takes place between molecules with the same or different compounds.

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Answer:

this is because aluminium is a non renewable source of material. the process to mine it is expensive. the process releases greenhouse gases which are harmful to the environment. it takes a long time to extract the aluminium. it is a way to help reduce waste products.

( this answer will only get you about 5 marks you need one more point in your answer. I just couldn't be bothered to think about another one.)

Answer:

4

Explanation:

The given atomic structure appears to have 2 shells/orbits containing electrons – 2 in the inner orbit and 4 in the outer orbit.

Since valence electrons are the electrons present in the outermost orbit/shell of an atom, their number in the given atom becomes 4. (If the 2nd orbit is the outermost orbit, the number of electrons it contains becomes the number of valence electrons).

Why is the number of valence electrons important?

Atoms are neutral, that contain an equal amount of positive and negative charges. All atoms are not stable. Their stability depends upon the number of electrons in specific orbits,( for eg 2 in the innermost orbit, then 8, 18 and so on.)

Valence electrons are loosely attracted by the nucleus and hence can easily be removed from an atom. The number of valence electrons an atom needs to donate/share/accept becomes its valency.

For elements and compounds to exist, the atoms they contain demand stability – which can only be attained by the loss/gain of these valence electrons.

_________________

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4 moles of ammonia molecules can be made when 6 grams of hydrogen gas reacts with excess nitrogen.

\(N_{2}\)(g) + 3\(H_{2}\)(g) → \(2NH_{3}\)(g)

1 mole of \(N_{2}\) reacts with 3 moles of \(H_{2}\)

Therefore, 6 moles of \(N_{2}\) will react with 18 moles of \(H_{2}\)

\(H_{2}\) + 6 no. of moles. ( Hydrogen is a limiting reagent).

No. of moles of ammonia are formed when 3 moles of \(H_{2}\) will react with excess of \(N_{2}\) = 2

No. of moles of ammonia are formed when 6 moles of \(H_{2}\) will react with excess of \(N_{2}\) = 2/3×6 = 4

Therefore, it is a gaseous equation (all the reactants as well as products are gases).

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Spontaneous at high T, non-spontaneous at low T aligns with the Le Chatelier's principle.

To determine the spontaneity of a reaction at different temperatures, both Le Chatelier's principle and the concept of entropy can be considered.
Le Chatelier's principle predicts that an endothermic reaction, which absorbs heat, will shift toward the products at higher temperatures.
This is because increasing the temperature adds energy to the system, favoring the endothermic direction to consume the added heat.
Entropy is a measure of the randomness or disorder of a system. According to the second law of thermodynamics, for a spontaneous process, the total entropy of the system and its surroundings must increase.
In general, reactions that increase the total number of product molecules or moles tend to have a positive change in entropy (ΔS) and are more likely to be spontaneous. Based on Le Chatelier's principle and the fact that the reaction is endothermic, option A is a reasonable choice.

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The reaction has a rate law of the rate = (1.25 m⁻²s⁻¹)[A][B]². The concentration of [B] will give the reaction of rate of 0.0891 m/s if the concentration of [A] is 0.250 M is [B] is 0.52 M.

The concentration of [A] = 0.250

The Rate = (1.25 m⁻²s⁻¹)[A][B]²

By solving the equation , we get :

0.0857 = 1.25 [A] [B]²

0.0857 = 1.25 × 0.250 × [B]²

0.0857 = 0.3125 [B]²

[B]² = 0.27424

[B] = 0.52 M

Thus, the concentration of the [B] is 0.52 M with the  reaction has a rate law of rate = (1.25 m⁻²s⁻¹)[A][B]².

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The original volume of HBr that was titrated can be calculated as the ratio of the moles of HBr to its concentration.

To determine the original volume of HBr that was titrated, we can use the concept of stoichiometry and the equation balanced for the neutralization reaction between HBr and KOH.

The balanced equation is:

HBr + KOH → KBr + H₂O

From the balanced equation, we can see that the stoichiometric ratio between HBr and KOH is 1:1. This means that for every mole of HBr, we need an equal number of moles of KOH to complete neutralization.

First, let's determine the moles of KOH used in the titration:

Moles of KOH = 0.500 M × 0.075 L = 0.0375 mol

Since the stoichiometric ratio is 1:1, this also represents the number of moles of HBr that were neutralized.

Now, we can calculate the original volume of HBr using the concentration of the unknown solution:

Moles of HBr = 0.0375 mol

Concentration of HBr = unknown (let's assume it is C mol/L)

Volume of HBr = Moles of HBr / Concentration of HBr = 0.0375 mol / C mol/L

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Answer: 0.938 moles of \(ZnCl_2\) will be produced.

Explanation:

To calculate the moles, we use the equation:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}\)

moles of zinc:

\(\text{Number of moles}=\frac{61.0g}{65g/mol}=0.938moles\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

As HCl  is in excess , zinc is the limiting reagent and it limits the formation of product.

According to stoichiometry :

1 mole of Zn produce =  1 mole of \(ZnCl_2\)

Thus moles of  Zn produce = \(\frac{1}{1}\times 0.938=0.938\) moles of \(ZnCl_2\)

Thus 0.938 moles of \(ZnCl_2\) will be produced.

 Phlogiston theory is wrong as it states that when petrol burns in air phlogiston is lost in  air so the mass decreases but as per law of conservation of mass , mass never increases or decreases rather it is constant.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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The type of structure :

Snakes have remnants of back legs = Vestigial Structure.

Bats have the same arm bone structure as cats = homologous structure.

Frogs, humans, and whales have a backbone = homologous structure.

Bats and moths both have wings, but not a common ancestor = analogous structure.

The Vestigial Structure is the Genetically found structures and the  attributes which have the lost most and the all of their function in the given species. The Homologous structures are those structures from the organisms that will share the common ancestor.

The Analogous structures are the features for the different species which are same in the function and not in the structure.

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Answer:

C, A, A, B

Proof:

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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The substance that will have the greatest solubility at 90 degrees is substance C

A significant factor affecting how soluble gases are in liquids is temperature. In general, as temperature rises, solubility of gases in liquids declines.

This is done so that the gas molecules can depart the liquid more rapidly and easily when the temperature rises and their kinetic energy rises. Higher temperatures make it more difficult for a gas to dissolve in a liquid because there is less attraction between the molecules of the two substances.

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The answer is substance A

Answer:

option D is the correct answer of this question.

When stress is applied to an equilibrium reaction then the system will change its concentration to shift to a new equilibrium position.

So, the correct option is D.

The stage at which the rate of formation of reaction is equal to rate of backward reaction in an reversible reaction is called equilibrium.

The reaction in such stage occur is called equilibrium reaction.

There are some factors which affects the equilibrium.

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Answer:

the correct answers is "neutralize"

Explanation:

When an acid is related to a base or also called an alkali and they reach a pH of 7, this acid will be neutralized or it will be canceled as the question says.

This happens so it reaches an equilibrium between both compounds, where the solution medium where these two compounds are is NEITHER ACID NOR BASIC, that is why it is called NEUTRAL medium.

Whenever you read that the pH of a solution is balanced, a neutralized acid, or a ph7 it means that the solution is NEUTRAL.

Answer:

a or c

Explanation:

Can I have the brainliest pls?

Answer:

Carbohydrates

Hope this helps:)

In de Morceau's nomenclature scheme, the smaller atom appears first.

Nomenclature is an organism name system used in biological classification. Genus and species names, two Latinized nouns drawn from numerous sources, serve as indicators of the species to which the creature belongs.

On August 26, 1743, Antoine-Laurent Lavoisier was born in Paris, France. He was a well-known French chemist and a key player in the 18th century chemical revolution. In addition to co-creating the current system for identifying chemical compounds, he established an experiment-based explanation of the chemical reactivity of oxygen.

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The pH of the 0.045 M solution of a weak acid that has ka = 1.2 x10-⁵ is 3.97.

The pH of a solution is a measure of the acidity or alkalinity of that solution.

The pH of a solution is the negative logarithm of the hydrogen ion concentration in the solution.

Since weak acids are not completely ionized in solution, the Henderson-Hasselbalch equation is used to determine pH. The Henderson-Hasselbalch equation is expressed as

pH = pKa + log([A⁻] / [HA]

Where;

pKa = -log(Ka)

[A⁻] is the concentration of the conjugate base

[HA] is the concentration of the weak acid

Acid Ka = 1.2 * 10⁻⁵

[A⁻] = [H⁺] = x.

[HA] = 0.045 M - x.

Ka = [A⁻]·[H⁺] / [HA].

1.2·10⁻⁵ = x² / (0.045 M - x).

Solve quadratic equation: [H⁺] = 0.00001199M.

pH = -log[H⁺].

pH = -log(0.00001199 M).

pH = 4.92

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The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

40.3044 g/mol

Explanation:

hope this helps

Answer:

C

Explanation:

that's really the only one that makes any sence