Which particle changes to create a new element?
A.proton
B.neutron
C.electron

Answer:

ΔG° = 80 Kj/mole

Explanation:

ΔG° = -R·T·ln(Kw)

R = 0.008314 Kj/mol·K

T = 25°C = 298K

Kw = 1 x 10⁻¹⁴

ΔG° = -R·T·ln(Kw) -(0.08314Kj/mol·K)(298K)ln(1 x 10⁻¹⁴)

= -(0.008314)(298)(-32.2)Kj/mole

= 79.78Kj/mole ≈ 80Kj/mole (1 sig.-fig.)

The change in free energy for the autoionization of water at 25°C is -79.9 KJ

Using the formula;

ΔG = -RTlnK

ΔG  = change in free energy = ?

R = gas constant = 8.314 J/K/mol

T = temperature = 298 K

K = equilibrium constant = 1.0 X 10^-14

Substituting into the given formula as;

ΔG = -  (8.314 J/K/mol × 298 K × ln(1.0 X 10^-14))

ΔG = -7.99 × 10^4 J/mol or -79.9 KJ/mol

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Answer:

the answer is going to be D

Explanation:

the make new product but do not change

Answer:

It appears to be

Explanation:

I did that question.

Aluminum displaces the iron in a redox reaction as it has its protective layer of aluminum oxide because it is more reactive than iron.

A redox reaction is a reaction in which oxidation and reduction reaction occur simultaneously and to the same extent.

An oxidation reaction occurs when atoms of elements lose electrons resulting in an increase in the oxidation number of the element.

A\ occurs when atoms of elements gain electrons resulting in a decrease in the oxidation number of the element.

The redox reaction of the displacement of iron by aluminum to form a protective layer of aluminum oxide is given below:

Fe₂O₃ (aq) +  2 Al (s) ----> 2 Fe (s) + Al₂O₃

In the given redox reaction above, aluminum metal displaces iron from its oxide to form aluminum oxide. Iron (iii) ion is reduced to metallic iron while metallic aluminum is oxidized to aluminum (iii) ion.

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Answer:

B. Single replacement

The statement that best describes energy is energy is the ability to do work. Option 3 is correct.

Energy is a property or characteristic of a system or object that allows it to perform work. Work, in physics, is defined as the force applied to an object multiplied by the distance over which the force is applied. Energy can be transformed from one form to another, but it cannot be created or destroyed. It can only be transferred from one object or system to another.

Energy can be stored in different forms such as potential, kinetic, thermal, chemical, electrical, and nuclear energy. Potential energy is the energy that an object possesses due to its position or state, whereas kinetic energy is the energy of motion. Thermal energy is the energy of a system or object due to its temperature, and chemical energy is the energy stored in the bonds between atoms and molecules. Option 3 is correct.

The complete question is

Which statement best describes energy?

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When working with corrosive chemicals, it is particularly important to minimize the risk of contact with the skin, eyes, and mucous membranes.  Proper personal protective equipment includes Gloves, Eye Protection, Protective Clothing, and Respiratory Protection

Corrosive substances can cause severe damage to these body parts upon contact, leading to chemical burns, tissue damage, and potentially serious injuries. To ensure safety while handling corrosive chemicals, the use of proper personal protective equipment (PPE) is essential. PPE acts as a barrier between the chemical and the worker's body, reducing the risk of direct contact and potential harm. However, in general, when working with corrosive substances, the following PPE should be considered:

Gloves: Chemical-resistant gloves, such as those made of nitrile, neoprene, or PVC, should be worn to protect the hands from contact with corrosive chemicals. The gloves should be selected based on their compatibility with the specific chemicals being used.

Eye Protection: Safety goggles or a full-face shield should be worn to protect the eyes from splashes, sprays, or aerosols of corrosive chemicals. These protective devices provide a barrier against chemical contact and prevent eye injuries.

Protective Clothing: Lab coats or chemical-resistant aprons should be worn to cover and protect the body from chemical splashes or spills. The clothing should be made of materials that provide resistance to the corrosive substances being handled.

Respiratory Protection: Depending on the specific chemicals and their potential for releasing harmful vapors or gases, respiratory protection may be necessary. This can include wearing a respirator with appropriate filters or using a supplied-air system to ensure breathing air is free from corrosive contaminants.

By minimizing the risk of contact and employing the appropriate personal protective equipment, workers can reduce their exposure to corrosive chemicals and mitigate potential injuries or adverse health effects.

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isotopes of the same element differ in the number of neutrons they have in their nuclei.

isotopes are atoms of the same element that have different numbers of neutrons. The number of protons in the nucleus of an atom determines its atomic number and defines the element. However, isotopes have different mass numbers due to the varying number of neutrons.

Isotopes of an element have similar chemical properties but may differ in their physical properties, such as atomic mass and stability. The isotopes of an element can be identified by their mass number, which is the sum of the number of protons and neutrons in the nucleus.

For example, carbon-12 and carbon-14 are two isotopes of carbon with mass numbers 12 and 14 respectively. Both isotopes have 6 protons, but carbon-12 has 6 neutrons while carbon-14 has 8 neutrons.

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Answer:

mass=8,640g

Explanation:

\(n = \frac{mass}{molar \: mass} \)

where

mole(n)= 120mol

Molar mass = Ar2

= 36×2

= 72g/mol.

Mass = ?

Therefore mass =

\(120 = \frac{m}{72} . \\ 120 \times 72 = m \\ 8640g = m\)

The orbitals that overlap to form the C-H bond in CH4 are the S and sp3 orbitals.

In CH4, the carbon atom has four valence electrons in its outermost shell, and the four hydrogen atoms each have one valence electron. The carbon atom hybridizes its 2s and three 2p orbitals to form four sp3 hybrid orbitals, each of which can overlap with the 1s orbital of a hydrogen atom to form a sigma bond.

Therefore, the C-H bond in CH4 is formed by the overlap of the S orbital of the hydrogen atom and the sp3 orbital of the carbon atom.

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Rebekah reports the volume of sugar solution using metric system as 39.1 mL. Thus, option D is correct.

The metric system has been the measurement system introduced in 1790s. The system has mediated the units for the measurement of volume, mass, length.

The volume has been the space that has been occupied by matter. The volume can be denoted with SI unit L. However, the another accepted unit for volume has been mL.

Thus, the volume of sugar solution has been reported in mL.

The given sugar solution has volume of 1.32 fl. Oz

The volume in mL can be given as:

\(\rm 1\;fl\;Oz=29.6\;mL\\1.32\;fl\;Oz=1.32\;\times\;29.6\;mL\\1.32\;fl\;Oz=39.1\;mL\)

The volume of the sugar solution reported by Rebekah on the metric scale has been 39.1 mL. Thus, option D is correct.

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Answer: The given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.

Explanation:

When two different compounds chemically react with each other and their ions get exchanged with each other then it leads to the formation of two new compounds. This type of reaction is called double displacement reaction.

For example, \(KBr + AgNO_{3} \rightarrow KNO_{3} + AgBr(\downarrow)\)

Here, both KBr and \(AgNO_{3}\) are ionic compounds that leads to the formation of two new ionic compounds which are \(KNO_{3}\) and AgBr.

Thus, we can conclude that the given type of chemical reaction is a double replacement reaction, and each compound has the same set of ions.

Answer: There is a couple different ways to determine if a bond is ionic or covalent. By definition, an ionic bond is between a metal and a nonmetal, and a covalent bond is between 2 nonmetals. So you usually just look at the periodic table and determine whether your compound is made of a metal/nonmetal or is just 2 nonmetals.

The reaction that can be used to extract copper metal from copper sulfate solution would be equation 2.

Fe will displace Cu from CuSO4 because it is more reactive. In other words, Fe ranks higher than Cu in the reactivity series.

Thus:    \(Fe + CuSO_4 ---> Cu + FeSO_4\)

Even though Na will displace Cu from CuSO4, equation 1 will result in the formation of Cu(OH)2 instead of free Cu because it is a double replacement reaction.

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According to the ideal gas equation, the  pressure of 8.88 mole of helium gas at 20.0° C and 180 L volume is 111.97 atmospheres.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

According to the ideal gas equation , PV=nRT substitution gives P= 8.88×8.314×273/180=111.97 atmospheres.

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N and P pairs of elements would you expect to form a polar covalent bond.

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two nucleus are concurrently drawing these electrons to them. When the difference between both the electronegativity values of two atoms is too tiny for a transfer of electrons to actually occur to create ions, a covalent bond is formed.

Covalent bonds between atoms in a Lewis structure are shown as a single line connecting the two atoms, which corresponds to the chemical symbol for the element. Diatomic molecules including hydrogen, nitrogen, fluorine, chlorine, bromine, iodine, and astatine are the principal sources of covalent bonding.

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Answer: They are both chemical changes.

Explanation:

Stars with higher mass have much shorter life cycles because stars expand as they get older that is why the larger the star the older it is smaller stars are more dense with more energy

Answer:

The answer is Protein.

Answer:

radiation takes place with energy between a heat source and an object

Explanation:

g o o g l e

Quinone is an example of a T cell immune system.

These refers to the cells and organs present in organisms which are responsible in providing resistance to germs and infections.

T cells form part of the immune system and provide adaptive immune response through attacking foreign bodies in the body.  Quinone reacting with skin proteins and creating a complex that now triggers an immune response depicts the defense mechanism of T cells.

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Amount of salt dissolved directly depends on the temperature of water.

High temperature means higher average velocity of water molecules, thus higher kinematic energies to break the bonds of salts (dissolving salts). Another reason is the higher chance for hotter water molecules to interact with salts, and it is another reason that salts dissolve quicker in hot water.

In short, the reasons are: higher velocities, higher energies and more frequent interactions. Solubility increase with temperatures. This is because hot temperatures make atoms move quicker and the quicker they move, the easier they come apart!

When you hit the maximum amount that will dissolve, you say the mixture is a saturated solution at room temperature.

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The pink supernatant obtained from the centrifuged bloody stool sample of the neonate was likely to contain bilirubin. Bilirubin is a yellow-orange pigment that is produced from the breakdown of heme in red blood cells.

Normally, bilirubin is metabolized in the liver and excreted in bile. However, in neonates, the liver is not fully developed, and bilirubin may accumulate in the blood, causing jaundice.

The yellow color observed in the second tube, after adding 0.25 M sodium hydroxide, indicates the presence of conjugated bilirubin. Conjugated bilirubin is a water-soluble form of bilirubin that is excreted in bile.

Alkaline conditions (due to the addition of sodium hydroxide) convert unconjugated bilirubin into its water-soluble form, conjugated bilirubin. The rapid change to yellow color in the second tube suggests that the neonate had an excess of conjugated bilirubin, indicating a possible liver disease or other underlying condition that impairs bilirubin metabolism.

In summary, the yellow color change in the second tube indicates the presence of conjugated bilirubin in the bloody stool sample of the neonate, suggesting a possible liver disease or other underlying condition.

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1. The longer distance for each choice is:

2. The complete statements are as follows;

3. The basic unit of length in the metric system is the meter and is represented by a lowercase m.

4. The meter is defined as the distance traveled by light in absolute vacuum in 1⁄299,792,458 of a second.

5. The values that complete each statement is given below:

6. The larger value for each option is:

7. The number of millimeters in 1 centimeter is 10 mm

8. Using the ruler and line, the answers are:

The unit for measuring distance in the metric system is the meter. Smaller and larger values of the meter are also used such as millimeters, centimeters, kilometers, etc.

Other units for measuring distance include yards, miles, and inches.

The various units for measuring distance can also be interconverted using their conversion factors.

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Answer:

Its electrical charge is -2.

To determine whether the salts would form an acidic or basic solution when added to pure water, we need to examine the nature of the ions in the salts. Acidity or basicity is determined by the relative strength of the cation and anion.

a. NH4F:

NH4+ (ammonium ion) is a weak acid, while F- (fluoride ion) is a weak base. Since NH4+ is a stronger acid than F-, NH4F would form an acidic solution.

b. CH3NH3C2H3O2:

CH3NH3+ (methylammonium ion) is a weak acid, and C2H3O2- (acetate ion) is a weak base. Since CH3NH3+ is a stronger acid than C2H3O2-, CH3NH3C2H3O2 would form an acidic solution.

c. NH4ClO:

NH4+ is a weak acid, and ClO- (hypochlorite ion) is a weak base. Since NH4+ is a stronger acid than ClO-, NH4ClO would form an acidic solution.

d. C5H5NHNO2:

C5H5NH+ (pyridinium ion) is a weak acid, and NO2- (nitrite ion) is a weak base. Since C5H5NH+ is a stronger acid than NO2-, C5H5NHNO2 would form an acidic solution.

e. NH4CN:

NH4+ is a weak acid, and CN- (cyanide ion) is a weak base. Since NH4+ is a stronger acid than CN-, NH4CN would form an acidic solution.

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