FUDQPITJ8PXzpl6qZcrfQD6A/viewform?hr_submission=chklyut_jwBE
Potassium (K) is a soft, silver, solid metal. It is widely found in food we eat.
11
Na
22.990
Sodium
19
K
39.098
Potassium
37
Rb
85.488
Rubidium
Which statement correctly and accurately describes atoms of Rubidium?

The amount of sodium hydroxide in the solution is about 3.70 M.

To get the amount of sodium hydroxide in solution, we have to apply the following formula:

Molarity (M) = moles of solute / volume of solution in liters

Given:

Volume of solution = 117.5 ml = 117.5 / 1000 = 0.1175 L

Mass of sodium hydroxide = 17.4 grams

We need to convert the mass to moles using the molar mass of sodium hydroxide to determine its moles. The molar mass of sodium hydroxide (NaOH) is:

Na: 1 atom * atomic mass = 1 * 22.99 g/mol = 22.99 g/mol

O: 1 atom * atomic mass = 1 * 16.00 g/mol = 16.00 g/mol

H: 1 atom * atomic mass = 1 * 1.01 g/mol = 1.01 g/mol

Total molar mass of NaOH = 22.99 + 16.00 + 1.01 = 40.00 g/mol

So, we can calculate the moles of sodium hydroxide:

moles = mass / molar mass = 17.4 g / 40.00 g/mol = 0.435 moles

Molarity (M) = moles / volume = 0.435 moles / 0.1175 L ≈ 3.70 M

As a result, the amount of sodium hydroxide in the solution is about 3.70 M.

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Answer:

1 closer

2 24hours

3 tidal bulges

4 in a straight line

Explanation:

Tides have been the effect of the sea with the gravitational pull of the sun and moon.

1. Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is closer to the earth.

In spite of high pull of the Sun, the distance of moon from earth results in increased effect of moon gravitational pull than Sun.

2. Each day, each coastal region on Earth experiences two high tides and two low tides in every 24 hours time period.

The daily tides has been resulted at the coast with the moon revolution around the earth's rotation.

3. This is because the gravitational attraction of the Moon creates tidal bulges on two opposite sides of the planet.

The effect of the  moon gravitational force results in the bulging or the pulling force to the sea, resulting in the diurnal tides.

4. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented at a right angle measuring 90 degrees which gravitation pulls the water on Earth in the same direction, creating a large tidal range.

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Answer:

B) mostly empty space and has a small, positively charged nucleus

Explanation:

In the gold foil experiment, positively-charged alpha particles were directed towards a gold foil sheet. During the experiment, most of the particles went through the gold foil. However, a select few alpha particles were met with resistance and bounced off the sheet.

This proves that the gold atoms, which made up the gold foil sheet, were mostly empty space as most of the alpha particles passed through it. Furthermore, the particles which bounced off the sheet must have hit small, positively-charged nuclei. The nuclei must have been positive because similar charges repel each other. In other words, if the nuclei were negatively-charged, the positively-charged alpha particles would not bounce off the sheet, but instead "stick" to it.

Answer:

3. a. I⁻

Explanation:

The charge of the ion is determined by which group (vertical on the periodic table) the element is in. Iodine is in the halogens and therefore is most likely to have a  1- charge.

Your friend is studying a specific exergonic reaction. Your friend hypothesizes that the addition of enzyme X will reduce the delta-G of this reaction, thus allowing it to proceed spontaneously.

Enzymes do not change delta-G, so this hypothesis does not fit with what is known about this reaction.

According to the second law of thermodynamics any reaction that occurs at constant temperature without input of electrical energy or photons is exergonic. An example is cellular respiration. An exergonic reaction is a chemical reaction in which the change in free energy is negative (there is a net loss of free energy). It shows a spontaneous reaction if the system is closed and the initial and final temperatures are the same. For processes that take place in a closed system at constant pressure and temperature, the Gibbs free energy is used, while the Helmholtz energy is relevant for processes that take place at constant temperature and volume.

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Your friend is studying a specific exergonic reaction. your friend hypothesizes that the addition of enzyme x will reduce the delta-g of this reaction, thus allowing it to proceed spontaneously. The hypothesis does not fit with what is known about this reaction because Enzymes do not change delta-G.

1) An exergonic reaction is a reaction that produces free energy. Because it releases energy rather than consuming it, this kind of reaction can occur naturally, unhindered by outside factors.

2) Chemical processes known as exergonic reactions have a negative change in free energy. The free energy of a system is used to calculate its overall quantity of available energy; negative changes signify energy release, whilst positive changes signify energy storage.

Only the activation energy is altered by enzyme.

This concept does not make sense given what is known about the reaction because enzymes do not alter delta G.

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Answer:

B) The non-polar part of a molecule that is not attracted to water is said to be hydrophobic.

Explanation:

Due to the nonpolar nature of most organic compounds, they do not combine with polar molecules like water. As a result, organic materials are typically insoluble in water. They are soluble in nonpolar solvents, though. The correct option is B.

A substance's ability to reject water is referred to as hydrophobic. It refers to having a little liking for water and having a tendency to resist or not absorb it. Most hydrophobic molecules are non-polar and tend to cluster. Fats and oils repel water.

The solubility of the relevant organic compound diminishes as the non-polar component, or the hydrocarbon chain, gets longer.

Thus the correct option is B.

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No, a polar covalent bond will not form between the two nitrogen atoms in nitrogen gas (N2).

This is because nitrogen gas is a diatomic molecule and its chemical structure is symmetrical, meaning that the two nitrogen atoms have the same electronegativity. Electronegativity refers to the ability of an atom to attract electrons towards itself in a chemical bond. Since both nitrogen atoms have the same electronegativity, they will share the electrons equally, forming a nonpolar covalent bond.
A polar covalent bond forms when two atoms with different electronegativities share electrons unequally. In such a bond, one atom has a higher electronegativity than the other and attracts the shared electrons closer to itself, resulting in a partial positive charge on one atom and a partial negative charge on the other. This unequal sharing of electrons gives rise to a dipole moment in the molecule.
In summary, a polar covalent bond will not form between the two nitrogen atoms in nitrogen gas (N2) because both nitrogen atoms have the same electronegativity, resulting in equal sharing of electrons and a nonpolar covalent bond.

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The formula of sodium oxide is Na2O .

Answer:

The answer to this is Na2O

The acid that contains three hydrogen ions are called triprotic acid.

White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.

H₃PO₄ (aq)  ⇄  H⁺ (aq) + H₂PO₄⁻ (aq)          Kₐ₁ = 7.5 × 10⁻³

H₂PO₄⁻ (aq)  ⇄  H⁺ (aq) + H₂PO₄²⁻ (aq)       Kₐ₂ = 6.2 × 10⁻³

HPO₄²⁻ (aq)  ⇄  H⁺ (aq) + PO₄³⁻ (aq)            Kₐ₃ = 7.5 × 10⁻³

The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻  is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.

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According to specific heat capacity, when  3.0 kg of water is cooled from 80.0°C to 10.0°C 882 J of energy is lost.

Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.

Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.

It is given by the formula ,

Q=mcΔT,substitution of values gives Q= 3×4.2×20=882 J.

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The equilibrium constant expression for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) is given by: Kc = [NH3]^2 / ([N2] * [H2]^3)

In this expression, [NH3], [N2], and [H2] represent the molar concentrations of ammonia, nitrogen, and hydrogen, respectively, at equilibrium. The equilibrium constant (Kc) provides information about the relative concentrations of reactants and products at equilibrium.

For this reaction, a value of Kc greater than 1 indicates that the forward reaction (formation of ammonia) is favored at equilibrium. A value less than 1 suggests that the reverse reaction (breakdown of ammonia) is favored, and a value of 1 indicates that the concentrations of reactants and products are approximately equal at equilibrium.

It's important to note that the specific value of the equilibrium constant (Kc) for this reaction would depend on the temperature at which the reaction is taking place.

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The net result of the reactions catalyzed by hexokinase and glucose 6-phosphatase depends on the relative rates of the two reactions and the compartmentalization of the enzymes. If hexokinase dominates, glucose is converted to glucose 6-phosphate for energy production. If glucose 6-phosphatase dominates, glucose 6-phosphate is converted back to glucose for release into the bloodstream to maintain blood glucose levels.

The reactions catalyzed by hexokinase and glucose 6-phosphatase are essential steps in glucose metabolism, but they occur in different compartments of the cell and have opposing effects. Hexokinase catalyzes the conversion of glucose to glucose 6-phosphate in the cytoplasm, while glucose 6-phosphatase catalyzes the reverse reaction, converting glucose 6-phosphate back to glucose in the endoplasmic reticulum (ER) or the liver.

When both reactions occur simultaneously, the net result depends on the relative rates of the two reactions and the compartmentalization of the enzymes. If hexokinase activity dominates, glucose will be rapidly converted to glucose 6-phosphate in the cytoplasm. This is an important step in glycolysis, as glucose 6-phosphate can be further metabolized to produce energy.

On the other hand, if glucose 6-phosphatase activity dominates, glucose 6-phosphate will be dephosphorylated to glucose in the ER or the liver. This is crucial for the regulation of blood glucose levels, as it allows glucose to be released into the bloodstream for use by other tissues.

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The specific length and position of the shadow will also be influenced by the height and orientation of the flagpole, as well as the time of year and latitude.

The position and length of the shadow cast by a flagpole three hours later will depend on the movement of the sun and the angle of the sun's rays. Assuming that the sun is moving in a relatively straight path across the sky, if the flagpole is in the northern hemisphere, the shadow will shift to the east as the sun moves toward the west. The length of the shadow will decrease gradually as the sun gets closer to the horizon. If it is midday, the shadow will be shortest, while earlier or later in the day, the shadow will be longer. However, if the flagpole is in the southern hemisphere, the shadow will shift to the west as the sun moves toward the east, and the length of the shadow will increase gradually.

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it's actually made of silicates and believe it or not magnesium is a silicates so the closest would have to be A made of magnesium, iron, and calcium

If Kp for the reaction at this temperature is 0.0118, then NO₂'s equilibrium pressure is 0.084 atm.

The equilibrium will move to the part of the reaction where there are less moles of gas as pressure builds up. The equilibrium will move toward the reactant side where there are more gas molecules when the pressure is decreased.

NO(g) + SO₃(g) → NO₂(g) SO₂(g)

Initial:                 0.86       0.86        0          0

Change:              -x             -x         +x        +x

Equilibrium:    0.86-x      0.86-x      x           x

Given the data provided, the expression for Kp is as follows:

Kp = [NO₂] [SO₂] / [NO] [SO₃]

Kp = x.x / (0.86-x)²

The answer's value for Kp is 0.0118.

We plug this value into the equation above

0.0118 = x² / (0.86-x)²

When the quadratic equation is solved, the value of x is found to be 0.084 atm.

As a result, NO₂ has an equilibrium pressure of 0.084 atm.

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Answer:

that pdf looks sus

Explanation:

Explanation:

Picture A which shows an overall negative charge represents an anion. Anion are formed when an atom gains an electron. In doing that, the total number of electrons (negative charge) is greater than the number of protons (positive charge), hence it would have an overall negative charge.

Picture B which shows a neutral charge represents a neutral atom. In an atom, the number of electrons equals the number of protons.

Picture C which shows an overall positive charge represents a cation. Cation are formed when an atom loses an electron. In doing that, the total number of electrons (negative charge) is less than the number of protons (positive charge), hence it would have an overall positive charge.

Answer:

Many organic compounds are very flammable.

Explanation:

Because we do not want to inadvertently ignite chemicals and cause a fire or explosion. Most organic chemicals are incompatible with inorganic chemicals, and certain mixtures can cause violent reactions.

Answer:

c

Explanation:

the map shows water near the factories go into moth lake so all of the waist will end up there

The time taken by Carbon-14 to decay radioactively from 120g to 112.5g is 22,920 years.

Time required for the whole radioactive decay of any substance will be calculated by using the below link:

T = (n)(t), where

Initial mass of Carbon-14 = 120g

Final mass of Carbon-14 = 112.5g

Left mass = 120 - 112 = 7.5g

Number of required half life for this will be:

4 half lives are required, now on putting values we get

T = (4)(5730) = 22,920 years

Hence required time for the decay is 22,920 years.

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Answer:

The three compounds are different compounds

Explanation:

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound A = 1.750 g

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound B  = 0.8750 g

The mass of Nitrogen that combines with 1 gram of Oxygen in  Compound C  = 0.4375 g

According to the law of multiple proportions, when atoms of two different elements react to form compounds, the masses of one of the elements that combines with a fixed mass of the other element are in small whole number ratios.

The ratio of the masses are;

Mass of Nitrogen in Compound B/(Mass of Nitrogen in Compound C =  0.8750/0.4375 = 2

Mass of Nitrogen in Compound A/(Mass of Nitrogen in Compound C =  1.750/0.4375= 4

Mass of Nitrogen in Compound A/(Mass of Nitrogen in Compound B =  1.750/0.8750= 2

Given that the masses of Nitrogen in the three compounds are in small whole number ratios, the three compounds, Compound A, Compound B, and Compound C are different compounds.

Answer:

The volume of O2 is 7.11L.

Explanation:

1st) It is necessary to balance the chemical reaction:

The reaction is balanced, because there is the same amount of each element in both sides of the reaction.

2nd) From the balanced reaction, we know that from 2 moles of hydrogen peroxide (H2O2), 1 mole of oxygen gas is produced. Now, using the molar mass of hydrogen peroxide (34g/mol), we can calculate the number of moles of O2 that will be produced from 28g of H2O2:

- Conversion from grams to moles:

- Number of moles of O2 produced:

3rd) Finally, we can calculate the volume of O2 using the Ideal Gases formula, replacing the values of pressure (2.0atm), number of moles (0.41moles) and temperature (150°C=423K):

Remember that to use the Ideal Gases formula, the units must be: atm, liter, mol and Kelvin.

So, the volume of O2 is 7.11L.

Boiling water on a stove is an example of thermal energy. Thermal energy is produced when the atoms and molecules in a substance vibrate faster due to a rise in temperature.

Answer: Wowwwww

Explanation:yes

The red cabbage acid-base indicator is a popular choice for identifying the pH of a solution. It works by changing color in response to the acidity or basicity of the solution. However, it may not be suitable for use as an indicator in titrations.

Titrations are a precise method of determining the concentration of a solution by reacting it with a solution of known concentration (the titrant). This reaction is carried out until a specific end point is reached, which is usually identified by a color change in the indicator.
The problem with using red cabbage as an indicator in titrations is that it is not a reliable indicator for the endpoint. This is because the color change is not sharp enough, and the range over which it changes color is relatively broad. This can make it difficult to accurately identify the endpoint, which can result in inaccurate titration results.
Therefore, it is more common to use a specific indicator that is known to produce a sharp, distinctive color change at the end point of the titration. These indicators are carefully chosen to match the pH range of the titration, which ensures the accuracy and reliability of the results.
In summary, while the red cabbage acid-base indicator is a useful tool for identifying the pH of a solution, it is not suitable for use as an indicator in titrations. Titrations require a more specific indicator that can produce a sharp and reliable color change at the endpoint.

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Answer:

Presence of an Electrolyte

Metal Surface

Oxygen or Other Oxidizing Agent

Difference in Potential

Electrochemical Pathway

Explanation:

The balanced equation is:
8 NH3 + 7 O2 → 8 NO2 + 12 H2O.

Also, 1.00 mol of NH3 requires (7/8) mole(s) of O2.

Balancing chemical reactions involves adjusting the coefficients (numbers in front of the chemical formulas) in the chemical equation to ensure that the same number of atoms of each element are present on both sides of the equation.

Step 1: Write the unbalanced equation:
NH3 + O2 → NO2 + H2O

Step 2: Balance the nitrogen atoms:
4 NH3 + O2 → 4 NO2 + H2O

Step 3: Balance the hydrogen atoms by placing a coefficient of 6 in front of H2O:
4 NH3 + O2 → 4 NO2 + 6 H2O

Step 4: Balance the oxygen atoms by placing a coefficient of 7/2 in front of O2:
4 NH3 + (7/2) O2 → 4 NO2 + 6 H2O

Step 5: To remove the fraction, multiply all coefficients by 2:
8 NH3 + 7 O2 → 8 NO2 + 12 H2O

So, the balanced equation is: 8 NH3 + 7 O2 → 8 NO2 + 12 H2O.

According to the balanced equation, 1.00 mol of NH3 requires 7/8 moles of O2.

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Answer: Fl

Explanation:

If you go onto the periodic table, you find the element that has the atomic number 114. It is located in period 7 and Group 14.

Answer:

\(\huge \boxed{\mathrm{Fl}}\)

Explanation:

In the periodic table, the element with an atomic number of \(\sf 114\) is Flerovium.

The symbol for the element Flerovium is \(\sf Fl\) .

The order of equilibrium constants from largest to smallest is:

1. K(I2)

2. K(Br)

3. K(CI)

This is because as we move down the halogen group in the periodic table, the size of the halogen atoms increases, leading to a weaker bond strength and a lower tendency to form diatomic molecules like I2. Therefore, the equilibrium constant for the reaction forming I2 is the largest, followed by the reaction forming Br2, and then the reaction forming Cl2.

The halogen group is a group of elements in the periodic table that includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). These elements are highly reactive non-metals that have seven valence electrons and tend to gain one electron to form a halide ion with a -1 charge. They are also known for their ability to form diatomic molecules, such as F2, Cl2, Br2, and I2, through covalent bonding.

Equilibrium constants (K) are values that express the ratio of the concentrations of reactants and products at equilibrium for a given chemical reaction. The equilibrium constant depends on the stoichiometry of the reaction and the specific conditions (temperature, pressure, and so on) under which the reaction occurs.

For a general chemical reaction:

aA + bB ⇌ cC + dD

The equilibrium constant expression can be written as:

K = [C]^c [D]^d / [A]^a [B]^b

where [X] is the molar concentration of the species X in solution, and a, b, c, and d are the stoichiometric coefficients for A, B, C, and D, respectively.

The value of K can provide insight into the direction of the reaction at equilibrium. If K is large, the reaction will proceed mostly towards the products. If K is small, the reaction will proceed mostly towards the reactants. If K is close to 1, the reaction will be roughly balanced between reactants and products.

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