Which two chemists organized elements based on properties such as how the elements react.

Answer:

It would be C because its continuing to the next. It doesn't stop nor does it absorb anything.

Explanation: I hope this helps :) I'm only in 8th grade but this seems easy so if I am wrong I am soo sorry.

Group one of the periodic table are known as alkali metals. These elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

Group one of the periodic table is known as the alkali metals. These elements include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

                                They are highly reactive metals and share common properties such as being soft, having a shiny appearance, and reacting vigorously with water to produce hydrogen gas and alkaline solutions.

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(a) Increasing the magnitude of the charges on two charged particles and decreasing the distance between the particles increases the strength of the electric force between the particles.

(b) Iron filings can provide evidence that can be used to explain how two magnets exert forces on each other because each of the magnet can attract the iron filings.

The electrostatic force between two particles is determined from Coulomb's law as shown below;

F = kq₁q₂/r²

where;

Thus, from the equation above, increasing the magnitude of the charges on two charged particles and decreasing the distance between the particles increases the strength of the electric force between the particles.

Iron filings can provide evidence that can be used to explain how two magnets exert forces on each other because each of the magnet can attract the iron filings.

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Answer:

unit quiz k12

Explanation:

 Iron filings can provide evidence that can be used to explain how two magnets exert forces on each other because each of the magnets can attract iron filings. Another thing is that the patterns of the iron fillings show lines of force that make the magnet's magnetic field. For example, when a magnet is placed in a container and you place iron fillings over the lid it makes a pattern showing the lines of forces making the magnetic field

Answer:

I'd guess A

Explanation:

Answer: A to determine the level of radionuclides present

Explanation:

I took the test

The increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

Equilibrium is a state where the presence of base and acid is in equal quantity.

Increased pH, leads to more acidity and reduces the number of ions.

Ions are necessary for corals, oysters, mussels, and many other shelled organisms that require building their shells and skeletons.

Thus, increasing pH of an ocean is not enough to restore the equilibrium as seawater becomes more acidic, and the pH of the water drops. This process binds carbonate ions, reducing their abundance.

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Weak acids have lower ionization constants (Ka) compared to strong acids, indicating their limited ability to donate protons (H+ ions) in solution.

The term you are referring to is weak acid.

A weak acid is an acid that only partially dissociates or ionizes when dissolved in water, resulting in a reversible equilibrium between the undissociated acid (HA) and its corresponding ions (H+ and A-). The dissociation of a weak acid is represented by the chemical equation: HA <-> H+ + A-.

Examples of weak acids include:

Phosphoric acid (H3PO4)

Acetic acid (HC2H3O2)

Hydrofluoric acid (HF)

These acids do not completely break apart into their ions when dissolved in water, and the degree of dissociation varies depending on the specific weak acid and its concentration.

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The given reaction is a redox reaction where ammonium phosphate and molybdenum oxide are formed as products, along with water.

In this redox reaction, the reactants HPO4, 3NH4, and 12MoO4 combine to form the products (NH4)3PO4(MoO3)12 and 12H2O. The reaction can be balanced as follows:

3HPO4²⁻ + 9NH4⁺ + 36MoO4²⁻ + 46H⁺ → (NH4)3PO4(MoO3)12 + 12H2O

The reactants undergo oxidation and reduction processes to form the products, ammonium phosphate [(NH4)3PO4] and molybdenum oxide (MoO3)12, along with water (12H2O).

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Answer:

2. Makes accurate predictions based on only a small amount of empirical evidence

Explanation:

For a phrase or scientific finding to be considered a law, there has to be clear evidence and facts to support that specific finding. In the case of the evolution theory, the evidence is not clear enough to make it a law

Answer:

2. Makes accurate predictions based on only a small amount of empirical evidence

Explanation:

Water exhibits polarity and oil does not. The correct option is A.

This is due to the molecular structure of water, which has a partial positive charge on one end and a partial negative charge on the other. This property is known as polarity and allows water molecules to attract each other, forming hydrogen bonds. Oil, on the other hand, is made up of nonpolar molecules that do not have a charge distribution.

As a result, oil molecules are not attracted to water molecules and do not mix well. In fact, they tend to form separate layers, with the oil floating on top of the water. This is why the old cliché "oil and water don't mix" is true.

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Answer:

protons 30

neutrons 35

electrons 30

Answer:

5 grams of iron react with 5 grams of oxygen to produce iron 3 oxide.

The actual yield of the reaction is--- 5 grams.

What is the percent yield?

Explanation:

The balanced chemical equation of the reaction is:

\(4Fe(s)+3O_{2} (g)->2Fe_{2} O_3(s)\)

1)Identify the limiting reagent.

2)Using the limiting reagent calculate the amount of theoretical yield formed.

Identification of limiting reagent:

4 mol of Fe reacts with 3mol. of O2

that is:

4mol(55.84g/mol) of Fe reacts with ---- 3mol (32.0g/mol)

=223.36g of Fe reacts with ---- 96g. of O2

then,

5g of Fe requires how many grams of O2?

\(=>5g. of Fe * \frac{96g O2}{223.36g Fe} \\=2.14g. of O_{2} .\\\)

But provided 5g of O2.

So, O2 is present more than required.

Hence, O2 is the excess reagent and the limiting reagent is Fe.

The amount of product formed depends only on the amount of Fe only.

Theoretical yield:

From the balanced chemical equation:

4mol. of Fe forms ----- 2mol. of Fe2O3.

that is

223.36g of Fe forms --- 2(159.68g)of Fe2O3.

=>223.36g of Fe forms --- 319.36g of Fe2O3.

then,

5g of Fe forms ----? grams of Fe2O3

\(=>5g of Fe * \frac{319.36g Fe2O3}{223.36g of Fe} \\=7.14g. of Fe2O3\\\)

\(%Error =\frac{actual yield}{theoretical yield} * 100\\\\ %error=\frac{5g}{7.14g} * 100\\ %error =70.0\)% error=actual yield/ theoretical yield  x 100

%error=5g./7.14g  x100

=>%error=70.0

Hence, the answer is 70.0%.

Answer:

hope it helps and thank you for the points

Answer:

Its high

Explanation:

Becuase if u times it what do u get

Answer

Its final volume is 81.8 L

Explanation

Given;

Initial temperature, T₁ = 34.9°C = (34.9 + 273.15 K) = 308.05 K

Initial volume, V₁ = 70.0 L

Final temperature, T₂ = 86.8°C = ( 86.8 + 273.15 K) = 359.95 K

What to find:

The final volume at 86.8°C.

Step-by-step solution:

The final volume, V₂ can be calculated using Charle's law formula below:

Putting the values of the given parameters into the formula, we have

Hence, if the temperature of the gas increases to 86.8 degrees C, its final volume is 81.8 L

Answer:

81.8 L

Explanation:

Ideal gas law:

PV = nR T

V =   nR/P  * T       since nr and P are constant , this becomes

V = k T          where k is a proportionality constant ====> then:  V/T = k

so:

V1/T1 = V2/T2      ( NOTE : T must be in K)

V2 = T2 ( V1/T1) =  ( 86.8 + 273.15) ( 70.0) /(34.9 + 273.15) = 81.8 L

The largest mass that a water molecule can have is 24 amu.

Isotopes are those atoms of an element with the same atomic number but different atomic mass. Isotopes can be stable and unstable or radioisotopes.

The oxygen isotope has a molecular mass of 18 AMU and the isotope of hydrogen will be tritium which will have a molecular mass of 3 amu.

The water molecule has two hydrogens and one oxygen, So to calculate the largest mass that a water molecule could have using other isotopes will be;

(2 X 3) + 18 = 24 amu.

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Answer:

Explanation:

we know that density=mass/volume

mass=240.90 g

volume=200.00 ml

now

density=240.90 g/200.00

density=1.2045 g/ml

another way

1 dm^3 =1000 ml

200.00 ml =200.00/1000

200.00 ml=0.2 dm^3

now density=240.90 g/0.2 dm^3

density=1204.5 g/dm^3

somethingExplanation:

Despite the unfavorable equilibrium constant of the reaction catalyzed by glyceraldehyde 3-phosphate dehydrogenase, the cell is able to overcome this by several mechanisms.

Firstly, the product of this reaction, 1,3-bisphosphoglycerate, is rapidly converted to the next intermediate in the pathway, phosphoenolpyruvate, by the enzyme enolase. This ensures that the concentration of 1,3-bisphosphoglycerate remains low, driving the reaction forward towards product formation.
Secondly, the pathway is coupled with other favorable reactions, such as the conversion of ATP to ADP and the production of NADH. These reactions help to drive the overall pathway forward, even if individual reactions have unfavorable equilibrium constants.
Finally, the cell may regulate the activity of the enzyme glyceraldehyde 3-phosphate dehydrogenase through allosteric regulation or post-translational modifications, such as phosphorylation. This ensures that the enzyme is only active when necessary and helps to maintain a steady flow through the pathway.
Overall, the cell is able to overcome the unfavorable equilibrium of the reaction catalyzed by glyceraldehyde 3-phosphate dehydrogenase through a combination of factors, including rapid conversion of product, coupling with favorable reactions, and enzyme regulation.

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Answer

7.53% 97% if you divide it you can get the answer

Explanation:

Answer:

False

Explanation:

Answer:

false

Explanation:

yes

Nucleosomes are complexes that are shifted in position along a DNA strand by chromatin-remodeling engines, which play a vital role in controlling access to genetic information and modulating gene expression.

The engines play a crucial role in regulating access to genetic information, as they help expose specific DNA sequences for essential biological processes, such as transcription, replication, and DNA repair.

Nucleosomes consist of a segment of DNA wrapped around a core of histone proteins, forming the fundamental unit of chromatin. Chromatin is the condensed structure of DNA and proteins, which allows the long DNA strands to fit within the confines of a cell nucleus.

Chromatin-remodeling engines are large multi-subunit protein complexes that utilize ATP hydrolysis to alter the structure and positioning of nucleosomes. This dynamic process can either tighten or loosen the interaction between DNA and histone proteins, making DNA regions more or less accessible to other cellular machinery, such as transcription factors or DNA polymerases.

By modulating nucleosome positioning, chromatin-remodeling engines play a vital role in regulating gene expression. When specific genes need to be activated or repressed, these engines help expose or shield the relevant DNA sequences, allowing the appropriate cellular machinery to access the genetic information.

In summary, nucleosomes are the complexes that are shifted in position along a DNA strand by chromatin-remodeling engines.

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Answer:

i guess the answer is..true

the ozone in troposphere protects the earth from ultra violet waves that may cause global warming

Answer:

can you please type english?Explanation:

Answer:

chemical bond

Explanation:

chemical bond is the interaction that allows for atoms to join together

Answer:

c. A electron cloud is the interaction

Ocean and wind currents are both caused by

So,option A is correct one.

The air that moves in a river like a flow in a particular direction is called wind current.

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3. At 250°C, the equilibrium constant for the reaction is 0.111 mol/L.

4. [NO] is 25.92 M at equilibrium.

5. [NH3] is 0.45 M at equilibrium.

The balanced chemical equation for the reaction is:

H2(g) + I2(g) ⇌ 2HI(g)

At equilibrium, we have [H2] = 4 - 1 = 3 mol/L, [I2] = 4 - 1 = 3 mol/L, and [HI] = 1 mol/L.

The expression for the equilibrium constant, Keq, is:

Keq = [HI]^2 / ([H2] x [I2])

Substituting the values we obtained, we get:

Keq = (1 mol/L)^2 / ((3 mol/L) x (3 mol/L))

Keq = 0.111 mol/L

4. Using the equilibrium constant expression: Keq = [N2][O2] / [NO]^2

Since the reaction is 2 NO ⇄ N2 + O2, we can assume that at equilibrium the concentration of N2 and O2 are equal and x, and the concentration of NO is 2x (since the stoichiometry is 2:1). Therefore, we have:

Keq = x^2 / (2x)^2

42 = x^2 / 4x^2

x^2 = 42 * 4x^2

x^2 = 168x^2

x^2 - 168x^2 = 0

x^2 (1 - 168) = 0

x = 0 (not possible) or x = √(168) = 12.96 M

5. Using the equilibrium constant expression: Keq = [NH3]^2 / [H2]^3[N2]

Substitute the given values: Keq = 20, [H2] = 0.40 M, [N2] = 0.25 M, and let x be the equilibrium concentration of NH3. Then:

Keq = x^2 / (0.40)^3(0.25)

20 = x^2 / 0.010

x^2 = 0.010 x 20

x^2 = 0.2

x = √(0.2)

x = 0.45 M

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As stated in the preceding statement 20 mm microwaves operate at a frequency of 15 GHz.

There are several ways to quantify frequency, including Counting: The number of times a recurring event occurs within a given time period is counted, and the number is then divided by the duration of the time period to determine the frequency of the occurrence.

λ= 20 mm = 20×10⁻³ m

v=3 x 10⁸ m /s (In a vacuum, all electromagnetic waves move at the speed of light, which is 3 x 10⁸ m /s.)

3 x 10⁸ m /s= f × 20×10⁻³ m

3 x 10⁸ m /s÷20×10⁻³ m= f

1.5×10¹⁰ Hz= 15×10⁹ Hz= 15 GHz

20 mm microwaves have a 15 GHz frequency.

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The molar mass of the gas is approximately 36.18 g/mol.

To find the molar mass of a gas, you can use the Ideal Gas Law formula: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature. We are given P, V, T, and the mass of the gas, so we can rearrange the formula to find the molar mass (M).

First, solve for n:

n = PV / RT

n = (1.529 atm * 0.507 L) / (0.0821 L atm/mol K * 291 K)

n ≈ 0.034 moles

Next, find the molar mass (M) by dividing the mass of the gas by the number of moles:

M = mass / n

M = 1.23 g / 0.034 moles

M ≈ 36.18 g/mol

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