When a substance dissolves, it undergoes a chemical change.
a. True
b. False

Answers

Answer 1

Answer:

False.

Solubility is not a chemical property but rather it is a physical property. A physical property is one that can be observed or measured and does not change the composition or identity of a substance in the process.

When a substances dissolves, this is a change of its physical state and it is mostly reversible. For example, salt can dissolve in water to form a solution called brine. This does not alter the chemical nature of salt. When the water evaporates, salt is left behind in its original state or form. In other words, that was a physical change and it was completely reversible.

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If two oxygen atoms combine to make a molecule, what type of bond will they form

Answers

They will form a diatomic molecule, bonded by covalent bond. 2 atoms of oxygen because it 1 atom cannot be stable as 2 together....
.... I hope it helps

Final answer:

Two oxygen atoms form a stable molecule by sharing two pairs of electrons, forming a double covalent bond. This is an important process for achieving the required octet electron configuration for both oxygen atoms.

Explanation:

When two oxygen atoms combine to form a molecule, the type of bond they form is a double covalent bond. An atom of oxygen has six electrons in its valence shell and it requires two more to achieve stability, hence, the oxygen atom achieves this equilibrium by sharing two pairs of electrons forming a double covalent bond. This is similar to the example of hydrogens and an oxygen atom sharing electrons to form a water molecule, where covalent bonds are also present.

The creation of a double bond occurs as these atoms share more than one pair of electrons to attain the required octet configuration. This could also be seen in bonds formed between carbon and oxygen atoms in formaldehyde (CH₂O), or between carbon atoms in ethene (C₂H4).

The covalent bond formed between these two oxygen atoms is, therefore, a key component for them to form a stable molecule.

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Which numbers are used? Consider the balanced chemical equation that follows. You are asked to determine how many moles of water you can produce from 4.0 mol of hydrogen and excess oxygen. (Excess oxygen means that so much oxygen is available it will not run out.) Which of the numbers that appear in the balanced chemical equation below are used to perform this calculation?

Answers

I am assuming that the balanced equation is
2H₂ + O₂ ⇒ 2H₂O
Since the hydrogen is the limiting reagent (meaning if the hydrogen runs out the reaction stops), we need to compare the mole ratio between hydrogen and water.

The mole ratio between H₂ and H₂O is 2:2, or 1:1 (as seen on the coefficients of the balanced equation)
And so for every mole of hydrogen, it will be equal to water. Since hydrogen is 4 moles, 4 moles of water would be created.

So we use the coefficients of H₂ and H₂O in order to answer this question.

The number of moles of H2O is proportional to the number of moles of H2 as much as 4 moles

The calculation reference is the mole of the limiting reagent of the mole of H2O is based on the mol of H2

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Stokiometry in Chemistry learns about chemical reactions mainly emphasizing quantitative, such as calculation of volume, mass, number, which is related to the number of ions, molecules, elements, etc.

In chemical calculations, the reaction can be determined, the number of substances that can be expressed in units of mass, volume, mole, or determine a chemical formula, for example, the substance level or molecular formula of the hydrate.

The reaction equation is the chemical formula of reagents and product substances

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

In the reactionequation there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).

Known variable

4.0 mol of hydrogen and excess oxygen

Asked

the balanced chemical equation

Answer

Reactions that occur:

2H₂ + O₂ ⇒ 2H₂O

The reaction coefficient shows the mole ratio of reactants and reaction products

In determining the mole of the reaction, the calculation reference is the mole of the limiting reagent or the reagent that runs out. Because here it is stated that oxygen (O₂) is reacted under excess conditions, the hydrogen ratio becomes the limiting reagent. So the determination of the mole of H₂O is based on the mol of H₂

In the equivalent equation, the mole of H₂ and H₂O is 2: 2 or can be simplified to 1: 1, so the number of moles of H₂O is proportional to the number of moles of H₂ as much as 4 moles

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Excess reactant

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The percentage yield

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Limiting reactant

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Keywords: limiting reactant, excess, reaction coefficient, the balanced chemical equation, H₂O, O₂, H₂

Name this compound: Spelling counts! PCI5

Answers

P is a element called Phosphorus.
Cl is chlorine. Since their is 5 of chlorine, we call it pentachloride. Penta means 5, as in the shape PENTAgon.

Compound Name: Phosphorus pentachloride

We can see here that the compound with the formula, $PCI_(5)$ is called phosphorus pentachloride.

What is a compound?

A compound is a substance that consists of two or more different elements chemically bonded together in fixed proportions. In a compound, the constituent elements lose their individual properties and form new chemical properties unique to the compound.

The study of compounds is central to chemistry, as it involves understanding the structure, composition, and reactivity of substances. Compound analysis and synthesis play vital roles in various scientific fields, such as materials science, pharmaceuticals, and environmental science.

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Water is intitally present in a state where its molecules are far apart. During a change of state it’s molecule slow down which change of state has most likely taking place

Answers

Molecules will move faster and spread apart on warmer temperatures The colder it get the slower the molecules move so naturally those water molecules are on the path to freezing

You submerge a piece of clay in water and measure the total volume. You change the shape of the clay and put it back into the same amount of water. Does the mass change? Explain. ANSWER FAST

Answers

The mass will not change, because if you add or subtract any clay the mass doesn't change if u took some away or added any the mass would have changed.

What is measurement?

Distance has a physical quantity which has been measured in meter. If a man travel then it will measured in meters that shows that how much he had travelled from one place to another place for all such type of things we use to measure the distance.

Centimeter is also been physical quantity which has to be used measure distance. 1 centimeter is just equal to 0.01 meter and 1 centimeter is just equal to 0.00001 kilometer and the kilometer has been large quantity to measure distance on the other hand centimeter is smaller quantity in which distance is measured.

Kilometer is also known as physical quantity which used to measure the distance of 1 kilometer which is equal to 1000 meter and 1 kilometer is just equal to 10,0000 centimeter.

For above conclusion, we easily states that the kilometer is large quantity to measure distance while centimeter is smaller quantity to measure distance. Centimeter is also a physical quantity which is use to measure distance. 1 centimeter is equal to 0.01 meter and 1 centimeter is equal to 0.00001 kilometer.

Therefore,The mass will not change, because if you add or subtract any clay the mass doesn't change if u took some away or added any the mass would have changed.

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no, because if you didn't add or subtract any clay the mass doesn't change if u took some away or added any the mass would have changed

if eqaul volumes of 0.1 m naoh and 0.1 m hcl arw mixed, the resulting solution will contain a salt and what

Answers

It will contain NaCl. The acid base reaction will look like this: HCl(aq)+NaOH(aq)⇒H₂O(l)+NaCl(aq)

The reaction occurs due to the fact that HCl (being a strong acid) will dissociate into H⁺ and Cl⁻ while NaOH (being a strong base) will dissociate into OH⁻ and Na⁺. The H⁺ and OH⁻ will react together to form water and the Na⁺ and Cl⁻ will remain in solution as the salt. (this is sometimes called a neutralization reaction since the HCl and NaOH neutralize each other.)

I hope this helps. Let me know if anything is unclear.

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