Radioactive radium has a half-life of approximately 1599 years. What percent of a given amount remains after 460 years

Answer:

When the Zebra arrived they ate all the food so the Unionid mussels declined as they died from the lack of food. Causing the Zebra Zebra numbers to increase and Unionid numbers to decline.

Answer:

the question to your answer to your question omnivores.

Explanation:

Answer:

The correct answer is (1). Zn has the highest electronegativity of all the metals in its column. It has a strong attraction for electrons and low ionization potential, so if potassium chloride were used instead of hydrochloric acid, potassium would react most readily.

Explanation:

This question is asking which metal will react most readily. According to the activity series, alkali metals are more reactive than alkaline earth metals. Magnesium has the lowest outer electron configuration of all the metals in its row on the periodic table so it will have a strong attraction for electrons. The magnesium atom therefore requires less energy to reach an outer energy level so it has the lowest first ionization potential. Therefore, magnesium will react most readily with HCl.

Answer:

I think its cadmium pliz mark brainliest if helpful

The magnitude of Δ for this complex is 2.40 x 10^4 kJ/mol.

We can use the relation between energy (E) and frequency (v) of light:

E = h*v

where h is the Planck's constant.

The frequency of light can be related to its wavelength (λ) and speed of light (c) as:

v = c/λ

where c is the speed of light.

We know that the absorption maximum for the d-d transition in \([Ti(H_2O)_6]^{3+}\)occurs at a wavelength of 500 nm. Therefore, the frequency of the absorbed light is:

v = c/λ = (3.00 x 10^8 m/s) / (500 x 10^-9 m) = 6.00 x 10^14 Hz

The energy of the absorbed light can be calculated using the first equation:

E = hv = (6.626 x 10^-34 Js) * (6.00 x 10^14 Hz) = 3.98 x 10^-19 J

We can convert this energy to kilojoules per mole using the Avogadro's number:

3.98 x 10^-19 J * (6.02 x 10^23 mol^-1) / 1000 J kJ^-1 = 2.40 x 10^4 kJ mol^-1

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The magnitude of DELTA for the d-d transition in [Ti(H2O)6]3+(aq) is 26.4 kJ/mol. To calculate DELTA, we first need to calculate the frequency of the absorbed light

To calculate DELTA, we first need to calculate the frequency of the absorbed light using the formula E = hν, where E is the energy of the absorbed light, h is Planck's constant, and ν is the frequency of the light.

We can then use the formula c = λν, where c is the speed of light and λ is the wavelength of the absorbed light, to calculate the frequency. The wavelength of the absorbed light is given as 500 nm. Using these equations, we can calculate the frequency of the absorbed light to be 6.0 x 10^14 s^-1.

Next, we use the equation DELTA = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of the absorbed light, to calculate DELTA.

Substituting the values into the equation, we get DELTA = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(500 x 10^-9 m) = 39.8 x 10^-20 J. Converting the result to kJ/mol using Avogadro's number, we get 26.4 kJ/mol.

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The H₂0 ion concentration of a solution is (1 x 10⁻⁴) mole per liter. To determine the pH of the solution, we can use the equation pH = -log[H+], where [H+] represents the hydrogen ion concentration. The correct answer is A) acidic and has a pH of 4.

In this case, the hydrogen ion concentration is (1 x 10⁻⁴) mole per liter. Taking the negative logarithm of this concentration, we have:

pH = -log((1 x 10⁻⁴)) = -(-4) = 4

Therefore, the solution is acidic and has a pH of 4.

The correct answer is A) acidic and has a pH of 4.

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Answer:

Greatly affected.

Explanation:

The stability of a nucleus is greatly affected by changing the number of nuclear particles because changing the number of nuclear particles i.e. neutron or proton will leads to change the element. When we change the number of protons in an atom, we will change the atom from one element to a different element. Sometimes, when you add a proton to an element, the element will become radioactive in nature so we can conclude that changing number of nuclear particles impact the stability of nucleus of an atom.

Answer:

Weak; a lot of potential energy.

Explanation:

Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

In chemistry, a covalent bond is a chemical connection between two ions or atoms in which their respective electron pairs are shared. A molecular bond is another name for a covalent link.

Several other chemical species, including radicals and macromolecules, may also include this kind of connection. Irving Langmuir invented the term "covalence" around 1919 to characterize the quantity of electron pairs exchanged by nearby atoms, but the phrase "covalent bond" wasn't used until 1939. Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

Therefore, carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

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The solution with the higher boiling point would be the 0.300 m KCl solution.

This is because boiling point elevation is directly proportional to the concentration of solute particles in a solution. Since KCl dissociates into two ions in solution (K+ and Cl-), it will have a greater number of solute particles than glucose, which does not dissociate into ions. Therefore, the KCl solution will have a higher boiling point elevation and a higher boiling point than the glucose solution. It's important to note that the actual boiling point elevation will depend on the molality of the solution and the properties of the solvent.

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Answer:

2.5385 mol

Explanation:

do a quick conversion : 1 grams gold = 0.0050770041918285 mole using ...powered by AnyClip. 1 ... 500 grams gold to mol = 2.5385 mol

Answer:

4.97 atm

Explanation:

P2=V1P1/V2

I know this is correct because P and V at constant T have an inverse relationship.

- Hope that helps! Please let me know if you need further explanation.

Answer:

halved

Explanation:

If the value of volume doubles, but the mass stays the same, the value for density will be halved. The correct option is 3.

Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.

Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.

Volume is the space occupied by a three-dimensional object. Volume is calculated by dividing mass by density.

These three factors are related to each other. If two variables are given, the third can be calculated.

Thus, the correct option is 3. Halved.

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In this compound, the proportion of carbon atoms to oxygen atoms is 12: 11.

What distinguishes an atom of carbon as such?

The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first two electrons must occupy the innermost atomic orbital, while the wavefunctions of the following four electrons only partially fill the second standard and three second principal orbitals.

How are atoms located in a compound?

Calculate the element's molar mass using the periodic table. To determine the atoms, the number of moles, divide the given mass in grams by the molar mass. To get the number of atoms, multiply the number of moles by Avogadro's number.

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Answer: D

Explanation:

Answer:

75 grams

Explanation:

At 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water.

The solubility of a substance in a particular solvent is the maximum amount of that substance that can dissolve in the solvent at a given temperature. The solubility of a substance can be affected by factors such as temperature, pressure, and the presence of other substances.

For K2Cr2O7, the solubility in water is highly dependent on temperature. At 95 °C, the solubility of K2Cr2O7 in water is approximately 75 g/100 mL. This means that at 95 °C, you can dissolve up to 75 grams of K2Cr2O7 in 100 mL of water. Since 100 g of water is equivalent to 100 mL, you can dissolve up to 75 grams of K2Cr2O7 in 100 g of water at 95 °C.

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Answer: 15768 seconds

Explanation:            (50 years) x (365 da/yr) x (86,400 sec/da)

        =      (50 x 365 x 86,400)  seconds

        =        1.5768 x 10⁹ seconds

Answer:

=> 2.8554 g/mL

Explanation:

To determine the formula to use in solving such a problem, you have to consider what you have been given.

We have;

mass (m)     = 16.59 g

Volume (v) =  5.81 mL

From our question, we are to determine the density (rho) of the rock.

The formula:

\(p = \frac{m}{v}\)

Substitute the values into the formula:

​\(p = \frac{16.59 g}{5.81 mL} \\ = 2.8554 g/mL\)

= 2.8554 g/mL

Therefore, the density (rho) of the rock is 2.8554 g/mL.

An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons.

An Arrhenius acid increases the number of\(H^+\) ions in the water.

According to the Arrhenius theory, a substance which has hydrogen atom and can easily give hydrogen ion or proton in its aqueous solution is called as Arrhenius acid.

For example, when hydrochloric acid is dissolved in water, it forms chloride ion (\(Cl^-\)) and hydronium ion (\(H_3O^+\)).

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The statements which accurately describe the particles in differing states include:

Gases have the greatest kinetic energy which explains why its particles

move very rapidly and randomly when compared to other states of matter.

Conversion from solid to liquid or liquid to gas requires more energy being

added.

The particles in solids are tightly packed with very restricted movements

which is why they are able to vibrate at a place.

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Answer:Ionic bonds usually occur between metal and nonmetal ions.

Explanation:

Answer:

Na^+

Explanation:

The symbol for sodium is Na.  The term "sodium ion" assumes that the reader knows that sodium's single 3s electron is susceptible to theft by any nearby element that has a high electron affinity.  Sodium's ionization energy is low, allowing the 3s electron to move elsewhere and leave behinf a positively charged Na^+ atom.

Answer:

The correct answer is b) 0.627M

Explanation:

—COOH and —NH₂

Carboxylic Acid and Amino

Answer:

5.77x10^-7 m or 577 nm (nanometers)

Explanation:

The wavelength, λ, and frequency, ν, of light are described by the equation:

c = λν

where c is the speed of light.  

c = 3.0x10^8 m/s

v = 5.2x10^14

λ = c/v

λ = (3.0x10^8 m/s)/(5.2x10^14) = 5.77x10^-7 m

since 1 m = 10^9nm, we can express this as 577 nm (nanometers)

577 nm.  This is in the yellow light span of wavelengths.

To draw the alkenes cis-1,2-dichloroethene, trans-1,2-dichloroethene, and 1,1-dichloroethene, we need to understand the concept of alkenes and their structural formulas.

Alkenes are unsaturated hydrocarbons that contain a carbon-carbon double bond. The general formula for an alkene is CnH2n. In this case, we are dealing with alkenes that contain chlorine atoms.

Let's start by drawing cis-1,2-dichloroethene. In this compound, the two chlorine atoms are on the same side of the double bond. The structural formula can be represented as follows:

```
   Cl
    |
H3C=C(Cl)
```

Now, let's move on to trans-1,2-dichloroethene. In this compound, the two chlorine atoms are on opposite sides of the double bond. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
H3C=C=CH2
```

Lastly, let's draw 1,1-dichloroethene. In this compound, there is only one carbon atom, and both hydrogen atoms are replaced by chlorine atoms. The structural formula can be represented as follows:

```
   Cl     Cl
    |     |
   C=C
```

In these structural formulas, each line represents a single bond, and each corner and end of a line represents a carbon atom. Hydrogen atoms are not explicitly shown, but we assume that each carbon atom is bonded to the appropriate number of hydrogen atoms to satisfy the valence requirements.

It's important to note that these structural formulas represent a 2D representation of the compounds. In reality, molecules are three-dimensional, and the spatial arrangement of atoms can affect the properties and reactivity of the compound. Additionally, there can be different ways to draw the same compound while maintaining the same connectivity of atoms. However, the structural formulas provided above are the most common representations for these alkenes.

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The volume = 6.71 L

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

\(\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\)

V₁=7 L

T₁=25 °C(room temperature) + 273 = 298 K

T₂=12.5(halved) + 273 = 285.5 K

\(\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}\\\\\dfrac{7}{298}=\dfrac{V_2}{285.5}\\\\V_2=6.71~L\)

The basic steps of the Carbon Cycle involve carbon dioxide uptake by plants through photosynthesis, transfer of carbon through the food chain, release of carbon back into the atmosphere through respiration and decomposition, and long-term storage of carbon in fossil fuels and other geological formations.

Concentrations of atmospheric and terrestrial carbon can fluctuate due to natural processes and human activities, such as deforestation and burning of fossil fuels. The Carbon Cycle begins with plants absorbing carbon dioxide from the atmosphere through photosynthesis. This carbon is converted into organic compounds and transferred through the food chain as organisms consume plants or other organisms. The carbon is released back into the atmosphere through respiration and decomposition.

Terrestrial carbon can be stored for varying lengths of time. Some carbon returns to the atmosphere relatively quickly, while some may be stored in plant material, soils, or detritus for longer periods. Additionally, carbon can be sequestered in geological formations over millions of years, forming fossil fuels like coal, oil, and natural gas.

Fluctuations in atmospheric and terrestrial carbon concentrations can occur due to natural processes and human activities. Natural factors such as volcanic eruptions and wildfires release carbon into the atmosphere, while the growth of forests and other plant life can remove carbon dioxide from the air.

Human activities, particularly the burning of fossil fuels and deforestation, have significantly increased carbon dioxide levels in the atmosphere, leading to climate change. These activities disrupt the natural balance of the Carbon Cycle, causing an accumulation of carbon dioxide and contributing to global warming.

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