Classify the following as chemical change (cc), chemical property
(cp, physical change (pc), or physical property (pp).

1.sublimation
2.Silver tamshing
3.heat conductivity
4.magnetizing steel
5.shortening melting
6.exploding dynamite
7.length of metal object
8.brittleness
9.combustible
10.baking bread
11.milk souring
12.water freezing
13.wood burning
14.acid resistance​

\(\huge\purple{Hi!}\)

carbon atom can form four covalent bonds.

The relative atomic mass of an element is compared with the mass of an atom of carbon-12.

Carbon-12 is chosen as the reference because it has a mass of exactly 12 atomic mass units (amu). The relative atomic mass, also known as atomic weight, provides a standard for comparing the masses of different elements.

It is calculated based on the weighted average of the masses of an element's naturally occurring isotopes, taking into account their abundance. By using carbon-12 as the reference, scientists establish a consistent scale for expressing atomic masses.

This standardization is essential for accurately conveying the mass of atoms in a way that is universally understandable and comparable across various elements and compounds.

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However, without the specific solubility data, it is not possible to provide an accurate answer. Solubility values vary depending on temperature and other factors.

To calculate the required volume of methanol to recrystallize 25 mg of benzoic acid at room temperature, we need to know the solubility of benzoic acid in methanol.

Assuming that benzoic acid is fully soluble in methanol at room temperature, we can use the following equation to determine the required volume:

Volume of methanol = (mass of benzoic acid) / (solubility of benzoic acid in methanol)

Given that the mass of benzoic acid is 25 mg, we need to find the solubility of benzoic acid in methanol.

However, without the specific solubility data, it is not possible to provide an accurate answer. Solubility values vary depending on temperature and other factors.

Therefore, I recommend consulting a reliable source or conducting an experiment to determine the solubility of benzoic acid in methanol at room temperature.

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To determine the minimum volume of distilled water required to completely dissolve a 3.0 g sample of CuCO3 (copper carbonate) at 25°C, we need to consider the solubility of copper carbonate in water at that temperature.

The solubility of copper carbonate in water can vary with temperature. At 25°C, the solubility of copper carbonate is approximately 0.0013 g/100 mL. This means that for every 100 mL of water at 25°C, approximately 0.0013 g of copper carbonate can dissolve.

Now, we can set up a proportion to calculate the volume of water required:

(0.0013 g / 100 mL) = (3.0 g / x mL)

Cross-multiplying and solving for x, we get:

x = (3.0 g * 100 mL) / 0.0013 g

x ≈ 230,769 mL

Therefore, the minimum volume of distilled water needed to completely dissolve a 3.0 g sample of CuCO3 at 25°C is approximately 230,769 mL or 230.769 L.

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This question was already answered here's the link

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7

Scientists use pH to describe how acidic a substance is on a scale of 0 to 14. By definition, a substance is alkaline if it has a pH of over 7.

mark me as brilliant pls ❤️

Answer:

i think 2?

Explanation:

AI2 O2

srry if wrong but

hope this helps

The statement  "Believing that, with training, you will be able to run two miles without stopping by the end of the semester demonstrates self-efficacy." is True.

Self-efficacy is an individual's belief in their ability to successfully perform a specific task or complete a particular goal. Believing that, with training, you will be able to run two miles without stopping by the end of the semester is a demonstration of self-efficacy. This belief in one's abilities can have a significant impact on motivation, effort, and performance, as individuals who have high self-efficacy are more likely to set challenging goals and persist in the face of obstacles and setbacks.

Self-efficacy can be developed and strengthened through various experiences, including mastery experiences (successes), vicarious experiences (observing others), emotional and physiological states, and social persuasion. An individual's self-efficacy can also be affected by situational and dispositional factors, such as their confidence, past experiences, and the difficulty of the task at hand.

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The main answer to your question is (E) a molecular solid.

A molecular solid is composed of individual molecules held together by intermolecular forces, such as London dispersion forces, dipole-dipole forces, and hydrogen bonding.

These intermolecular forces are not strong enough to allow the substance to conduct electricity in solution or when melted.

Additionally, the low melting point of the substance indicates that the intermolecular forces holding the molecules together are relatively weak.

Summary: The substance is likely a molecular solid, which does not conduct electricity in solution or when melted due to weak intermolecular forces between individual molecules.

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Answer:

o cany give because of i am in 9th

Answer:

Mole ratio is 1:1

Explanation:

The equation is:

PCl₃ +  Cl₂  →  PCl₅

We see that is correctly balanced.

1 mol of PCl₃ react to 1 mol of chlorine gas in order to produce 1 mol of PCl₅

That's why, the mole ratio is, 1:1

There is not another number than 1, at stoichiometry of reaction.

Answer:

99758 meters

Explanation: 1 mile=1609 meters. Just multiply 62 with 1609. Let me know if you want a conversion sheet.

Atomic number of an atom is a number that represents how many protons are in an atom’s nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.

Explanation:

There is an intimate connection between the atomic structure of an atom and its spectral characteristics. Atoms of individual elements emit light at only specific wavelengths, producing a line spectrum rather than the continuous spectrum of all wavelengths produced by a hot object. Niels Bohr explained the line spectrum of the hydrogen atom by assuming that the electron moved in circular orbits and that orbits with only certain radii were allowed. Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states. Transitions from an excited state to a lower-energy state resulted in the emission of light with only a limited number of wavelengths Atoms can also absorb light of certain energies, resulting in a transition from the ground state or a lower-energy excited state to a higher energy excited state. This produces an absorption spectrum, which has dark lines in the same position as the bright lines in the emission spectrum of an element. Bohr's model revolutionized the understanding of the atom but could not explain the spectra of atoms heavier than hydrogen.

Answer:

51.79g Li₃P.

Explanation:

Li has a molar mass of 6.94 g (since there are 3, you multiply it 3 times) and P has a molar mass of 30.97 g. 6.94(3) + 30.97 = 51.79g.

Answer:

kenetic

Explanation:

Answer:

Explanation:

activation energy

The minimum amount of energy needed for a reaction to take place is called the activation energy .

Answer:

Explanation:

The balanced equation for the reaction between aqueous zinc bromide (ZnBr₂) and solid aluminum (Al) to produce aqueous aluminum bromide (AlBr₃) and solid zinc (Zn) is:

3ZnBr₂ + 2Al -> 2AlBr₃ + 3Zn

In this reaction, three moles of zinc bromide (ZnBr₂ ) react with two moles of aluminum (Al) to yield two moles of aluminum bromide (AlBr₃) and three moles of zinc (Zn). The equation is balanced in terms of both mass and charge, ensuring that the number of atoms of each element is the same on both sides of the equation.

This reaction represents a single replacement or displacement reaction, where aluminum replaces zinc in the compound to form a new compound and release zinc as a solid product.

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If a sample of carvone gives a specific rotation of 0 ° and the specific rotation of pure R- carvone is -61 ° , the enantiomer is the unknown sample, the correct option is C. racemic mixture.

The carvone gives a specific rotation =  0 °

The  specific rotation of pure R- carvone =  -61 °

The racemic mixture is formed when an equal amount of mixture of the R enantiomer and the S enantiomer of the carvone is formed. In  racemic mixture, the R enantiomer rotates the plane polarized light in the one direction and the S enantiomer rotates the plane polarized light in the another direction.

It will cancels out the rotation . The  each enantiomer equal in magnitude but opposite in the direction and have specific rotation of 0 ° for the racemic mixture.

This question is incomplete, the complete question is :

If a sample of carvone gives a specific rotation of 0 and the specific rotation of pure R- carvone is -61, which enantiomer is the unknown sample?

A. R

B. S

C. Racemic

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Answer:

the net force is 5. I believe the boat with move to the left due to the increase amount of force the boy is using to push the boat.

The empirical formula of the unknown compound is CH₂O.

To determine the empirical formula of the unknown compound, we need to find the mole ratios of carbon and hydrogen in the compound based on the given masses of carbon dioxide (CO₂) and water (H₂O) produced during combustion analysis.

First, we calculate the moles of CO₂ and H₂O produced:

Moles of CO₂ = mass of CO₂ / molar mass of CO₂

= 2.845 g / 44.01 g/mol

= 0.0647 mol

Moles of H₂O = mass of H₂O / molar mass of H₂O

= 1.744 g / 18.015 g/mol

= 0.0968 mol

Next, we determine the mole ratio of carbon to hydrogen by dividing the moles of each element by their respective smallest values:

Carbon: 0.0647 mol / 0.0647 mol = 1

Hydrogen: 0.0968 mol / 0.0647 mol = 1.5

We need to simplify the ratio, so we multiply both values by 2 to obtain whole numbers:

Carbon: 1 × 2 = 2

Hydrogen: 1.5 × 2 = 3

The empirical formula of the unknown compound is CH₂O, indicating that it contains 2 carbon atoms, 3 hydrogen atoms, and 1 oxygen atom.

In summary, the empirical formula of the unknown compound is CH₂O.

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Answer:

962.2 K

Explanation:

Ideal Gas Law Equation:

PV = nRT

Writing a Equation to find T2:

PV = nRT

(P1V)/(nT1) = R = (P2V)/(nT2)

(P1)/(T1) = R = (P2)/(T2)                  V and n cancel out since they are constant.

(P1)/(T1) = (P2)/(T2)

T2 = (P2)(T1)/(P1)

Substituting Into the Equation:

T2 = (283 kPa * 170 K)/(50 kPa)

T2 = 962.2 K

saturated solution: solution that has passed the saturation limit

The major product of the reaction of 2-bromobutane with sodium methoxide in methanol at 323 K is 2-methoxybutane.

It is necessary to consider the stereochemistry of the reaction.How to draw the major product of the reaction of 2-bromobutane with sodium methoxide in methanol at 323 K?To draw the major product of the reaction of 2-bromobutane with sodium methoxide in methanol at 323 K, first, we need to identify the reactants and the conditions under which the reaction is taking place.2-bromobutane (C4H9Br) is treated with sodium methoxide (NaOCH3) in methanol (CH3OH) at 323 K.

The reaction is a substitution reaction in which the Br group of the 2-bromobutane is replaced by the -OCH3 group of the sodium methoxide.The reaction mechanism is shown below: The major product of the reaction is 2-methoxybutane (C5H12O) as shown below: In 2-methoxybutane, the -OCH3 group is in the axial position and the -CH3 group is in the equatorial position. This is because of the steric hindrance between the -OCH3 group and the -CH3 group in the equatorial position.

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The hashtag #DoNotPollute help this social media post increase its impact adds the post to the larger conversation about pollution. Therefore, the correct option is option A.

The introduction of toxins into the environment that have a negative impact on it is known as pollution. Any material (solid, liquid, or gas) and energy (including radioactivity, heat, sound, and light) can be considered a form of pollution.

Both naturally occurring contaminants and imported substances/energies can be considered pollutants, which are the elements of pollution. The hashtag #DoNotPollute help this social media post increase its impact adds the post to the larger conversation about pollution.

Therefore, the correct option is option A.

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A bowling ball has both kinetic energy (KE) and gravitational potential energy (GPE).  KE is 75J, GPE is 2,310J.

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Answer:

The volume of the gas will be 78.31 L at 1.7 °C.

Explanation:

We can find the temperature of the gas by the ideal gas law equation:

\( PV = nRT \)

Where:

n: is the number of moles

V: is the volume

T: is the temperature

R: is the gas constant = 0.082 L*atm/(K*mol)

From the initial we can find the number of moles:

\( n = \frac{P_{1}V_{1}}{RT_{1}} = \frac{1 atm*62.65 L}{(0.082 L*atm/K*mol)*(0 + 273)K} = 2.80 moles \)

Now, we can find the temperature with the final conditions:

\( T_{2} = \frac{P_{2}V_{2}}{nR} = \frac{612.0 mmHg*\frac{1 atm}{760 mmHg}*78.31 L}{2.80 moles*0.082 L*atm/(K*mol)} = 274.7 K \)

The temperature in Celsius is:

\( T_{2} = 274.7 - 273 = 1.7 ^{\circ} C \)

Therefore, the volume of the gas will be 78.31 L at 1.7 °C.

I hope it helps you!            

Answer:

Any type of material is a matter. It can be anything that occupies space and have mass. It is a composition of atoms which is term is made up of electrons, protons, and neutrons. All particles in our universe are matter because everything has some mass and it occupies space...

Can i be brainiest...

Answer:

Anything that has mass and occupies space is the right answer

Explanation:

Just took the test