why should atom or ions join together to form compounds? ​

1.  We can see here that energy is required to change the phase of matter. For example, energy is required to melt ice, vaporize water, and condense steam. The amount of energy required to change the phase of matter is called the latent heat.

Energy is a fundamental concept in physics and refers to the ability or capacity of a system to do work or produce a change.

2. The demonstration on the sample of water showed that water can exist in three phases: solid, liquid, and gas. The solid phase is ice, the liquid phase is water, and the gas phase is steam.

The demonstration started with ice at 0°C. As heat was added to the ice, the temperature of the ice increased. However, the ice did not melt until the temperature reached 0°C. This is because the energy from the heat was used to break the bonds between the water molecules in the ice. Once the bonds were broken, the ice melted and became water.

3. Completing the

Page 4:

Heating and cooling curves are graphical representations of how temperature changes during the process of heating or cooling a substance. They illustrate the relationship between temperature and the state of matter.

Both curves show:

Learn more about energy on https://brainly.com/question/2003548

#SPJ1

The angular spread of the light inside the glass is 132.4° for red light and 132.2° for violet light.

Given data: Red light n_red =1.52Violet light n_violet =1.55. Incident angle i = 28°To find: The angular spread of the light inside the glass.

Solution: The angle of incidence i = 28°The angle of refraction r can be calculated using Snell's law:µ1 sin i = µ2 sin where µ1 is the refractive index of the incident medium (air), µ2 is the refractive index of the refracting medium (glass), i is the angle of incidence, and r is the angle of refraction. For red light,µ1 = 1.0003 and µ2 = 1.52For violet light,µ1 = 1.0003 and µ2 = 1.55.

The angle of refraction can be calculated as follows: Red light: sin r = µ1/µ2 sin i= 1.0003/1.52 × sin 28°= 0.3736r = sin–1 (0.3736) = 22.31°Violet light: sin r = µ1/µ2 sin i= 1.0003/1.55 × sin 28°= 0.3863r = sin–1 (0.3863) = 22.93°The angle of deviation δ for a prism is given by:δ = (µ − 1)A. where µ is the refractive index of the prism and A is the angle of the prism. From the geometry of the prism, the angle of deviation can be related to the angle of incidence and the angle of refraction by the formula:δ = I + r – A where A is the apex angle of the prism.

Since the angle of deviation for red and violet light is the same, we can equate the two expressions for δ to obtain: I + r – A = i’ + r’ – A where i’ and r’ are the angles of incidence and refraction for violet light. Subtracting I + r = i’ + r’ from the above equation, we get: A = (i’ – i) + (r’ – r)Let the angular spread of the light inside the glass be θ. Then,θ = A/2= [(i’ – i) + (r’ – r)]/2For red light: i’ = 180° – 22.31° = 157.69°r’ = 180° – sin–1 (sin r/µ1) = 180° – sin–1 (0.2617/1.0003) = 157.45°θ = [(157.69° – 28.00°) + (157.45° – 22.31°)]/2= 132.41°For violet light: i’ = 180° – 22.93° = 157.07°r’ = 180° – sin–1 (sin r/µ1) = 180° – sin–1 (0.2491/1.0003) = 157.24°θ = [(157.07° – 28.00°) + (157.24° – 22.93°)]/2= 132.19°

Therefore, the angular spread of the light inside the glass is 132.4° for red light and 132.2° for violet light.

know more about angle of refraction,

https://brainly.com/question/31814721

#SPJ11

After considering the given data and statements we conclude that the correct option is A , Only one of the statements is true.

The statement that is true for a solution at 25 °C with pOH = 10.53 is:
iii) For this solution, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
Statement i) is false due to the fact that a solution with a pOH greater than 7 is basic, not acidic.
Statement ii) is false due to  the pH of the solution can be evaluated from pOH using the equation [tex]pH + pOH = 14[/tex], not by subtracting pOH from 14. Therefore, the pH of the solution is 14 - 10.53 = 3.47, which is acidic.
Statement iii) is true due to the concentration of hydroxide ions [tex]([OH^-])[/tex] can be calculated from pOH using the equation[tex][OH^-] = 10^{(-pOH)}[/tex]. Therefore, [tex][OH^-] = 10^{(-10.53)} M.[/tex]
To learn more about pH
https://brainly.com/question/26424076
#SPJ4

Answer:

BECAUSE OF DENSITY

Explanation:

Answer:

It's DENSITY

Explanation:

YOURE WELCOME

Answer:

50?

I think but not 100% sure if not lmk

Answer:

Explanation:

Remember, matter can neither be created nor destroyed, so every atom of reactant the leftt side of the equation must be accounted for in the products on the right side of the equation. With  magnesium and hydrochloric acid we have:  Mg  +  2HCl   →  MgCl2  +  H2(g).  Magnesium is divalent, and so requires two chloride ions to form magnesium chloride.  Hydrogen gas is a diatomic molecule, so the reaction requires the product to be H2.  Going across the equation from left to right we have 1 atom of magnesium (accounted for on the right side of the equation), and on the left, 2 moles of hydrochloric acid; the two hydrogens represented on the left of the equation are accounted for on the right of the equation.  Likewise, the two chloride anions on the left of the equation are accounted for in the formation of MgCl2 on the right. When all the atoms are accounted for on both sides of the equation, we say the equation is "balanced".

The amount of the compound [tex]XY_2[/tex] that can be generated would be 11.28 grams

From the equation of the reaction, the mole ratio of X and Y is 1:1.

Mole of 3.5 grams of X = 3.4/24 = 0.1417 moles

Mole of 4.2 grams of Y = 4.2/35 = 0.12 moles

Thus, Y is the limiting reactant because it is present in a lower amount than needed.

Mole ratio of Y and  [tex]XY_2[/tex] = 1:1

Equivalent mole of  [tex]XY_2[/tex] = 0.12 moles

Molar mass of  [tex]XY_2[/tex] = 24 + (35x2) = 94 g/mol

Mass of 0.12 moles of  [tex]XY_2[/tex] = 0.12 x 94 = 11.28 grams

More on stoichiometric calculations can be found here: https://brainly.com/question/27287858

#SPJ1

These orbital configurations represent the arrangement of electrons within the different energy levels and subshells of the respective elements.

The orbital configurations of the given elements are as follows:

Helium: 1s² - Helium has two electrons that occupy the 1s orbital.

Nitrogen: 1s² 2s² 2p³ - Nitrogen has two electrons in the 1s orbital, two electrons in the 2s orbital, and three electrons in the 2p orbital (specifically, 2p³ indicates three electrons in the 2p subshell).

Silicon: 1s² 2s² 2p⁶ 3s² 3p² - Silicon has two electrons in the 1s orbital, two electrons in the 2s orbital, six electrons in the 2p orbital, two electrons in the 3s orbital, and two electrons in the 3p orbital (specifically, 3p² indicates two electrons in the 3p subshell).

To know more about the orbital configurations refer here :

https://brainly.com/question/13840107#

#SPJ11

We can see here that highlighting that a prescription drug as a 90% success rate, rather than a 10% chance of death, is an example of framing bias.

A prescription drug, also known as a prescription medication or prescription medicine, is a pharmaceutical drug that requires a valid prescription from a licensed healthcare professional, such as a physician, nurse practitioner, or dentist, to obtain and use.

Prescription drugs are different from over-the-counter (OTC) drugs, which can be purchased without a prescription.

Framing bias is a type of cognitive bias that occurs when people make decisions based on how a problem is presented to them, rather than on the actual information that is presented.

Learn more about prescription drug on https://brainly.com/question/1392739

#SPJ4

After considering the given data we conclude that the concentration of [tex]SO_3^2^-[/tex]must exceed [tex]6.18*10^{-11} M[/tex] to generate a precipitate of [tex]MgSO_3[/tex].

To describe the concentration of [tex]SO_3^{2-}[/tex]required to generate a precipitate of [tex]MgSO_3[/tex], we can apply the following steps:
State the balanced chemical equation for the dissolution of [tex]MgSO_3[/tex] in water.
[tex]MgSO_3(s)--- > Mg_2+(aq) + SO_3^{2-} (aq)[/tex]
Write the equation for the solubility product constant, Ksp, for [tex]MgSO_3[/tex].
[tex]Ksp = [Mg^{2+} ][SO3^{2-} ][/tex]
Stage the given concentration of [tex]Mg^{2+}[/tex] into the expression for Ksp.
[tex]Ksp = (8.9*10^{-11} M)(x)[/tex]
Here,
x = concentration of [tex]SO_3^{2-}[/tex]required to reach the saturation point and generate a precipitate.
Stage the given value of Ksp into the expression for Ksp.
Evaluate for x.
[tex]x = Ksp/[Mg^{2+} ] = (5.5*10^{-21})/(8.9*10^{-11} M) = 6.18*10^{-11 }M[/tex]
To learn more about precipitate
https://brainly.com/question/30386923
#SPJ4

The expected initial pH for Buffer 1 and Buffer 2 is 4.54 and 4.94 respectively.

Buffer 1 is made of Acetate buffer and buffer 2 is made of Acetate buffer as well. We know the volume and concentration of the acid and salt in both buffers. The expected initial pH of Buffer 1 and Buffer 2 can be calculated using the Henderson-Hasselbalch equation. The Henderson-Hasselbalch equation is given as: pH = pKa + log {[A-]/[HA]}where[A-] is the concentration of the salt (NaC2H2O2),[HA] is the concentration of the acid (HC2H2O2),pKa is the acid dissociation constant of the acid (HC2H2O2).

Buffer 1: HC2H2O2 + H2O ⇔ C2H2O2- + H3O+No. of moles of HC2H2O2 = 0.10 M x 0.015 L = 0.0015 mol. No. of moles of NaC2H2O2 = 0.10 M x 0.01 L = 0.001 mol. Total volume = 0.015 L + 0.01 L = 0.025 L[HA] = 0.0015 mol/ 0.025 L = 0.06 M[A-] = 0.001 mol/0.025 L = 0.04 M. The pKa for HC2H2O2 is 4.76pH = 4.76 + log {[0.04]/[0.06]}= 4.76 - 0.22 = 4.54Thus, the expected initial pH for Buffer 1 is 4.54.

Buffer 2: HC2H302 + H2O ⇔ C2H3O2- + H3O+No. of moles of HC2H302 = 0.50 M x 0.01 L = 0.005 molNo. of moles of NaC2H2O2 = 0.50 M x 0.015 L = 0.0075 mol. Total volume = 0.01 L + 0.015 L = 0.025 L[HA] = 0.005 mol/ 0.025 L = 0.20 M[A-] = 0.0075 mol/0.025 L = 0.30 M. The pKa for HC2H302 is 4.76pH = 4.76 + log {[0.30]/[0.20]}= 4.76 + 0.18 = 4.94Thus, the expected initial pH for Buffer 2 is 4.94.

Therefore, the expected initial pH for Buffer 1 and Buffer 2 is 4.54 and 4.94 respectively.

know more about Henderson-Hasselbalch equation,

https://brainly.com/question/23711530

#SPJ11

The value of the double integral ∬(3x - y) dA, where the region R is in the first quadrant enclosed by the circle x² + y² = 9, the line x = 0, and the line y = x, using the transformation to polar coordinates, is 27/4√2.

To evaluate the double integral, we can switch to polar coordinates. In polar coordinates, the variables x and y are expressed in terms of r (radius) and θ (angle).

The region R, which is enclosed by the circle x² + y² = 9, can be expressed in polar coordinates as 0 ≤ r ≤ 3 and 0 ≤ θ ≤ π/4. This represents the first quadrant portion of the circle.

The Jacobian of the transformation from Cartesian to polar coordinates is r (the absolute value of the determinant of the Jacobian matrix). So, dA in polar coordinates is equal to r dr dθ.

Now, we can express the integral in terms of polar coordinates:

∬(3x - y) dA = ∫∫(3r cos θ - r sin θ) r dr dθ

Next, we need to set up the limits of integration. Since the region R is bounded by x = 0, y = x, and the circle x² + y² = 9, we can set up the limits as follows:

0 ≤ θ ≤ π/4 (corresponding to the angle that spans the first quadrant)

0 ≤ r ≤ 3 (corresponding to the radius of the circle)

Now, we can evaluate the integral:

∫[0,π/4] ∫[0,3] (3r cos θ - r sin θ) r dr dθ

By integrating with respect to r first, we get:

∫[0,π/4] [(3/4) r³ cos θ - (1/2) r³ sin θ] |[0,3] dθ

Simplifying further, we obtain:

∫[0,π/4] [(27/4) cos θ - (27/2) sin θ] dθ

Finally, we integrate with respect to θ:

[27/4 sin θ + (27/2) cos θ] |[0,π/4]

Plugging in the limits of integration, we have:

(27/4 sin(π/4) + (27/2) cos(π/4)) - (27/4 sin(0) + (27/2) cos(0))

Evaluating the trigonometric functions at the respective angles, we find:

(27/4 (1/√2) + (27/2) (1/√2)) - (27/4 (0) + (27/2) (1))

Simplifying further, we get the final result:

(27/4√2 + 27/2√2) - (0 + 27/2) = (27/4√2 + 27/2√2) - 27/2 = 27/4√2

Therefore, the value of the double integral ∬(3x - y) dA over the region R, using the transformation to polar coordinates, is 27/4√2.

To learn more about polar coordinates  here

https://brainly.com/question/14436205

#SPJ4

If the oxidation of glucose 6-phosphate via the pentose phosphate pathway were being used primarily to generate NADPH for biosynthesis, the other product, ribose 5-phosphate would accumulate. The accumulation of ribose 5-phosphate would lead to a problem, i.e. it would quickly deplete NADPH in the cell.

This is because ribose 5-phosphate is produced in the first step of the pentose phosphate pathway, and if it is not utilized in the next step, it will accumulate. This accumulation of ribose 5-phosphate will have a detrimental effect on the cell's metabolic pathways. In this case, the ribose 5-phosphate will compete with NADP+ as an electron acceptor. Since NADPH is required for the synthesis of fatty acids, nucleotides, and other essential biomolecules, its depletion will lead to an insufficient supply of these biomolecules. Therefore, the accumulation of ribose 5-phosphate will impair the biosynthetic processes that require NADPH.

Thus, it is essential to balance the pentose phosphate pathway to maintain the cellular redox balance, which is necessary for the normal functioning of the cell.

know more about biosynthetic processes

https://brainly.com/question/29515457

#SPJ11

To calculate the enthalpy of the reaction, c. The second equation must be halved, d. The second equation must be reversed. and e. The third equation must be halved.

The enthalpy of the reaction is the sum of internal energy in a  system, in this case of the total energy of the reaction  under constant conditions.

Therefore, with this data, we can see that the enthalpy of the reaction is the sum of energy, which obeys a series of laws such as described above.

Learn more about  the enthalpy of the reaction here:

https://brainly.com/question/14047927

#SPJ4

False. The given statement The molal boiling-point and freezing-point constants are different for different solvents is wrong.

Depression at the Freezing Point. A solution's freezing point is lower than that of the pure solvent. This indicates that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.

The number of solute molecules dissolved in one kilogram of the solvent is known as the molality of the solution, and it is directly inversely related to the drop in freezing point.

The effect of adding a solute to a solvent affects a solution's freezing point in the opposite way that it affects its boiling point. The freezing point of a solution will be lower than that of a pure solvent. The temperature at which a liquid turns into a solid is known as the freezing point.

To know more about the freezing-point  visit:

https://brainly.com/question/40140

#SPJ1

The final answer is  1.8 × 102 L of Rn, measured at STP, are produced per day by 1.08 g of Ra.

In order to determine the amount of radon that is produced per day by 1.08 g of Ra, it is essential to calculate the number of Rn atoms that are produced per second.

In the given question, it is known that 1.00 × 1015 atoms of radium produce an average of 1.373 × 104 atoms of Rn per second.

Therefore, we can use this ratio to calculate the number of Rn atoms that are produced per day by 1.08 g of Ra. Once we know the number of Rn atoms produced per day, we can calculate the volume of Rn produced by using the ideal gas law.

The final answer is  1.8 × 102 L of Rn, measured at STP, are produced per day by 1.08 g of Ra.

To know more about radium visit:

brainly.com/question/19471276

#SPJ11

The nonessential amino acid which uses glutamate as an intermediate in its synthesis in humans is the alanine. Alanine is a non-essential amino acid because it can be synthesized in the body by reusing amino groups from other amino acids through the process of transamination. 

Glutamate is a key amino acid that plays a crucial role in human metabolism, being involved in the biosynthesis of several amino acids including alanine. The synthesis of alanine from glutamate happens via transamination, a reaction that involves the transfer of the amino group of one molecule to another molecule that accepts it. The enzyme responsible for this reaction is called alanine transaminase or ALT and is found in the liver and muscle tissues. In the liver, the alanine that is produced can be released into the bloodstream and transported to other tissues where it can be used as a source of energy or for the synthesis of proteins.

To know more about amino acids visit:

https://brainly.com/question/31731149

#SPJ11

the identity of element E in the nuclear reaction (238)U --> (234)E + (4)He is thorium (Th).

What is Nuclear Reaction?

A nuclear reaction is one in which the nucleus of an atom is transformed into the nucleus of one or more daughter nuclei. This differs from a a chemical reaction in which atoms are changed from one form to another.

To identify the element E in the nuclear reaction (238)U --> (234)E + (4)He, we need to consider the conservation of mass number and atomic number.

In the given reaction, the mass number is conserved, as 238 = 234 + 4. This indicates that the total mass on the left side (238) is equal to the total mass on the right side (234 + 4).

Next, we consider the atomic number. The atomic number is the number of protons in the nucleus of an atom. In the reaction, uranium (U) has an atomic number of 92. Since helium (He) has an atomic number of 2, the sum of the atomic numbers on the right side should be equal to the atomic number on the left side.

92 (atomic number of U) = atomic number of E + 2

Solving this equation, we find:

atomic number of E = 92 - 2 = 90

The element with atomic number 90 is thorium (Th).

Therefore, the identity of element E in the nuclear reaction (238)U --> (234)E + (4)He is thorium (Th).

To learn more about Nuclear Reaction from the given link

https://brainly.com/question/23160149

#SPJ4

Answer:

a

Explanation:

A balanced chemical equation shows reacting ratios of all substances involved in reaction in terms of grams which is important while solving stoichiometry problems.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

Learn more about chemical equation,here:

https://brainly.com/question/28294176

#SPJ3

Answer:

See Explanation

Explanation:

The experiment of Ernest Rutherford involved the bombardment of a thin gold foil with alpha particles from a radioactive source. A zinc sulphide screen was used to follow the movement of the alpha particles.

It was discovered that most of the alpha particles  followed a  straight path through the gold foil. Some of them were scattered through large angles and few were even scattered in the backward direction.

Since alpha particles were heavier than electrons, they must have been deflected by very strong forces.

These experimental evidences led to the conclusions stated in the question.

Electrophilic aromatic substitution reactions have various applications in organic chemistry. They are commonly used to introduce functional groups onto aromatic rings, synthesize pharmaceuticals, produce dyes, and create complex organic molecules.

In organic chemistry, electrophilic aromatic substitution reactions are crucial tools for attaching new functional groups to aromatic rings. In these reactions, an electrophile replaces a hydrogen atom on an aromatic molecule. The end output can be used in a variety of different sectors.

Pharmaceutical synthesis is one area in which electrophilic aromatic substitution is used. Chemists can change the solubility, reactivity, and bioavailability of medicinal compounds by selectively adding functional groups to aromatic rings. This enables the creation of fresh medication candidates or the advancement of current ones.

The manufacture of dyes is an additional use. Due to their conjugated systems, aromatic compounds with particular functional groups can display bright hues. Colorful dyes used in textiles, inks, and other industries are produced through the introduction of chromophores onto aromatic rings using electrophilic aromatic substitution processes.

Additionally, it is essential for the synthesis of complex organic compounds to undergo electrophilic aromatic substitution processes. Chemists can create complex chemical structures with particular functions by carefully swapping various locations on an aromatic ring. This makes it possible to synthesize natural substances, sophisticated compounds, and materials with specific qualities.

To know more about Electrophilic aromatic substitution here https://brainly.com/question/30761476

#SPJ4

Answer:

6........................

Answer:

Energy decreases and wavelength gets longer.

Explanation:

The energy of a wave is given by :

[tex]E=hf[/tex]

Where

h is Planck's constant

f is the frequency of the wave

As frequency decreases, the energy of the wave also decreases and wavelength gets longer. Hence, the option is (d).  

The given statement "A highly positive charged protein will bind a cation exchanger and elute of with a high salt buffer" is true.

A cation exchanger is an adsorbent that is used to extract charged molecules from a solution and purify them. This adsorbent binds to molecules that are charged positively because it bears a negative charge. The cation exchanger is typically a negatively charged polymer that is insoluble in water and which is a negatively charged polymer. The cation exchanger will bind positively charged protein molecules in a similar manner. Cation exchange chromatography is a type of chromatography that separates molecules based on their charge. The cation exchanger is an example of a stationary phase in cation exchange chromatography. Proteins with positive charges will stick to the stationary phase, and they will elute when a high salt buffer is passed through the column to compete for the binding sites on the stationary phase.

know more about cation exchanger

https://brainly.com/question/6865269

#SPJ11

At a particular temperature, the solubility of H2 in water is 0.0200 M when the partial pressure is 0.0900 atm. To determine the solubility (in M) when the partial pressure of H2 is 1.54 atm, we can use Henry's law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas. By applying this law, we can set up a proportion to find the solubility at the given partial pressure.

According to Henry's law, the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas. Mathematically, this can be expressed as:

Solubility = k * Partial pressure

Here, k represents the proportionality constant.

Using the given information, we have the solubility of H2 as 0.0200 M when the partial pressure is 0.0900 atm. Let's assume k as the proportionality constant. We can set up a proportion using the solubility and partial pressure values:

0.0200 M / 0.0900 atm = k * (1.54 atm)

Solving for k, we find:

k = (0.0200 M / 0.0900 atm) / (1.54 atm) = 0.0143 M/atm

Now, we can use the proportionality constant to determine the solubility at the given partial pressure of 1.54 atm:

Solubility = k * Partial pressure = 0.0143 M/atm * 1.54 atm = 0.022 M

Therefore, the solubility of H2 in water will be approximately 0.022 M when the partial pressure of H2 is 1.54 atm.

To learn more about Henry's law, refer:

brainly.com/question/30636760

#SPJ11

Explanation:

1. If you measure the value of Hydronium concentration is 3.0x10-3 M/L, the solution can be predicted to be acidic. This is because the concentration of hydronium ions, H3O+, is greater than the concentration of hydroxide ions, OH-. The pH value of an acidic solution is less than 7. Since hydronium ions are present in a high concentration, the pH value of the solution will be less than 7.

2. If you measure the number of Hydronium ions is 3.0x1012, the solution can be predicted to be acidic. This is because the concentration of hydronium ions is greater than 1.0 x 10^-7 M/L. The pH value of an acidic solution is less than 7.

3. If you measure the number of Hydroxide ions is 3.0x10-2 moles, the solution can be predicted to be basic. This is because the concentration of hydroxide ions is greater than 1.0 x 10^-7 M/L. The pH value of a basic solution is greater than 7. Hence, if the number of hydroxide ions is greater than 1.0 x 10^-7 M/L, the solution will be basic.

Learn more about prediction of acid, base or neutral in a solution here https://brainly.in/question/11844799

#SPJ11

Answer:

oxygen

Explanation:

plants and animals use oxygen