A 1.8−mL volume of seawater contains about 4.0 × 10^−10 g of gold. The total volume of ocean water is about 1.5 × 10^21 L. Calculate the total worth of all the gold in the world's oceans if the price of gold is $19.96 per gram answer is in scientific notation

From the given information, approved eye protection is to be worn for certain experiments. Eye protection is an important safety measure in laboratories and other settings where hazardous materials or equipment are used.

However, it is not necessary to wear eye protection all the time, only when it is necessary to protect the eyes from specific hazards. For example, eye protection may be required when working with chemicals that can splash or when using equipment that can produce flying debris or particles.

It is important to follow the specific safety guidelines and regulations for your particular laboratory or workplace. These guidelines will specify when eye protection is required and what type of eye protection is appropriate for the task at hand. It is always better to err on the side of caution and wear eye protection when in doubt.

Learn more about experiments here: brainly.com/question/24795637

#SPJ4

Answer:

C

Explanation:

ionic bonds are bonds between metals and non-metals or metalloids ,so the only compound with a metal is KB

Let's solve each question step by step:

To find the new pressure of the gas after compression, we can use Boyle's Law, which states that the product of the initial pressure and volume is equal to the product of the final pressure and volume:

P1V1 = P2V2

Given:

P1 = 1 atm (standard pressure)

V1 = 1.00 L (initial volume)

V2 = 473 mL = 0.473 L (final volume)

Using the formula, we can rearrange it to solve for P2:

P2 = (P1V1) / V2

P2 = (1 atm * 1.00 L) / 0.473 L

P2 ≈ 2.11 atm

Therefore, the new pressure of the gas after compression is approximately 2.11 atm.

To find the volume of the gas after the explosion, we can use the Combined Gas Law, which relates the initial pressure, volume, and temperature to the final pressure, volume, and temperature:

P1V1 / T1 = P2V2 / T2

Given:

P1 = 4.0 x 10^6 atm (initial pressure)

V1 = 0.050 L (initial volume)

P2 = 1.00 atm (final pressure)

T1 and T2 are not provided, so we assume the temperature remains constant.

Using the formula and rearranging it to solve for V2:

V2 = (P1V1 * T2) / (P2 * T1)

V2 = (4.0 x 10^6 atm * 0.050 L) / (1.00 atm * T1)

Since the temperature remains constant, T2 = T1, and we can simplify the equation:

V2 = (4.0 x 10^6 atm * 0.050 L) / (1.00 atm)

V2 = 2.0 x 10^5 L

Therefore, the volume of the gas after the explosion is 2.0 x 10^5 liters.

To find the volume of the gas when compressed to a pressure of 6.00 x 10^4 atm, we can again use Boyle's Law:

P1V1 = P2V2

Given:

P1 = 1 atm (initial pressure)

V1 = 2.00 L (initial volume)

P2 = 6.00 x 10^4 atm (final pressure)

Rearranging the formula to solve for V2:

V2 = (P1V1) / P2

V2 = (1 atm * 2.00 L) / (6.00 x 10^4 atm)

V2 ≈ 3.33 x 10^-5 L

Therefore, the volume of the gas when compressed to a pressure of 6.00 x 10^4 atm is approximately 3.33 x 10^-5 liters.

To find the new volume of the gas when the pressure is released from 2.0 x 10^6 atm to 0.275 atm, we can again use Boyle's Law:

P1V1 = P2V2

Given:

P1 = 2.0 x 10^6 atm (initial pressure)

P2 = 0.275 atm (final pressure)

V1 = 1.0 x 10^-5 L (initial volume)

Rearranging the formula to solve for V2:

V2 = (P1V1) / P2

V2 = (2.0 x 10^6 atm * 1.

Learn more about gas after compression here:

https://brainly.com/question/18328910

#SPJ11

The weak acid, HF, is also a weak electrolyte. Since NaF is the salt of the strong base and weak acid HF, the mixture of HF and NaF functions as a buffer. Therefore, option D is correct.

A buffer solution is an aqueous mixture of a weak acid and either its conjugate base or base itself. When a modest amount of a strong acid or base is applied to it, the pH hardly changes at all.

A buffer solution can be created by mixing HF with NaF. Only two compounds—HF and NaF—contain a weak conjugate acid-base pair. While fluoride ion is its conjugate base and is provided as a sodium salt, HF is a weak acid.

Because there isn't nearly enough F to be termed a conjugated acid, the HF in H2O isn't a buffer. Therefore, if you add some acid, there won't be enough F to neutralize it.

Thus, option D is correct.

To learn more about buffer, follow the link;

https://brainly.com/question/3435382

#SPJ1

The given molecule has only 1 rhed – region of high electron density because of presence of one triple bond.

An electron density zone might be either bonding or non-bonding. Electrons in a covalent bond between two atoms are counted as one region, whether the link is single, double, or triple (or anything in between). The amount of lone pairs on the core atom is used to count non-bonding areas.

Double and triple bonds qualify as one high electron density region. A single unpaired electron counts as one high electron density region. One can utilize any of the resonance structures for molecules or ions that have resonance structures.

A high electron density atom or group indicates that some component of the molecular structure (such as resonance or inductive effects) is transferring negative charge towards this location in the molecule.

In the given molecule, A – B ≡ C

Only one triple bond is there and no lone pairs of electrons. Hence, only 1 rhed (region of high electron density) is present within the molecule.

Learn more about region of high electron density here:

https://brainly.com/question/25648755

#SPJ4

Answer:

Molarity = 2.0833 M (Approx)

Explanation:

Given:

Number of moles (n) = 0.25

Volume of solution = 120 ml = 0.12 L

Find:

Molarity

Computation:

Molarity = Number of moles (n) / Volume of solution.

Molarity = 0.25 / 0.12

Molarity = 2.0833 M (Approx)

Answer:

Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.

The substance with the weakest bonds between its molecules is benzene.

The strength of the bonds between molecules is determined by the type of bond and the bond length. Generally, the weaker the bond, the more easily the molecules can be separated from each other, leading to lower boiling and melting points.

In this list, benzene has the lowest boiling point of 5.7 °C, indicating that its bonds between its molecules are the weakest compared to the others. Castor oil has the highest boiling point at 9.8 °C, and phenol and formic acid have boiling points in between.

Therefore, based on boiling point, benzene has the weakest bonds between its molecules compared to castor oil, phenol, and formic acid.

The strength of the bonds between molecules is an important factor in determining the physical properties of a substance, such as boiling and melting point.

Bonds between molecules can be covalent, ionic, or hydrogen bonds, and their strength depends on the type of bond and bond length. Covalent bonds are the strongest type of bond and are found in molecules that share electrons. Ionic bonds are weaker than covalent bonds and are formed between two atoms with a large difference in electronegativity. Hydrogen bonds are the weakest type of bond and are formed between a hydrogen atom in one molecule and an atom with a high electronegativity, such as nitrogen, oxygen, or fluorine, in another molecule.

Learn more about covalent bonds here:

https://brainly.com/question/10777799

#SPJ4

The major difference between fossil fuels and biofuels is you can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel. The correct option is D.

A fossil is a naturally extracted fuel, for example, the anaerobic decompression of buried dead animals, while biofuel is any biomass fuel, plant or algae, or animal waste. Since these materials can quickly be replenished, biofuels are considered renewable energy sources.

Biofuels are created from renewable feedstocks, unlike fossil fuels, which are finite resources. As a result, their manufacturing and use might theoretically continue forever.

Therefore, the correct option is D. You can drive farther on a single tank of fossil fuel than you can on a single tank of biofuel.

To learn more about fossil fuels, refer to the link:

https://brainly.com/question/3371055

#SPJ2

Answer:

The value of k is equal to 9.

Explanation:

The given number is 4,522,800,000

We need to write it n the form of a×10ᵇ.

We will count the numbers after 4 in the given number. There are 9 number after 4. So,

\(4,522,800,000 =4.5\times 10^9\)

So, we can say that the value of k is equal to 9.

When a solution of aluminum chloride is mixed with a solution of potassium phosphate, a precipitate of aluminum phosphate (AlPO4) will form. The reaction between aluminum chloride and potassium phosphate can be represented as follows: AlCl3 + K3PO4 → AlPO4 + 3KCl .

This is due to the fact that the aluminum ion (Al3+) and the phosphate ion (PO43-) can react to form a solid precipitate, which is insoluble in water.

Therefore, when a solution of aluminum chloride is mixed with a solution of potassium phosphate, a white precipitate of aluminum phosphate (AlPO4) will form, while potassium chloride (KCl) will remain in solution.

To know more about aluminum phosphate (AlPO4), here

brainly.com/question/15146433

#SPJ4

The malate dehydrogenase reaction is a part of the citric acid cycle. Given the concentrations provided ([malate] = 1.31 mM, [oxaloacetate] = 0.290 mM, [NAD+] = 170 mM, [NADH] = 68 mM) and the standard free energy change (ΔG°' = 29.7 kJ/mol), we can calculate the free energy change (ΔG) for this reaction at 37°C (310 K) using the equation:
ΔG = ΔG°' + RT ln ([oxaloacetate][NADH])/([malate][NAD+])
Where R is the gas constant (8.314 J/mol·K) and T is the temperature (310 K). Plugging in the given values, we can find the free energy change for this reaction at the specified conditions. Therefore, the free energy change for the malate dehydrogenase reaction at pH 7 and 37.0°C, with the given concentrations, is 57.6 kJ/mol.

The malate dehydrogenase reaction is a crucial step in the citric acid cycle, converting malate and NAD+ to oxaloacetate and NADH. To calculate the free energy change for this reaction, we can use the equation:
ΔG°' = -RTln(Keq)
Where R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (310 K), and Keq is the equilibrium constant for the reaction.
To calculate Keq, we need to use the concentrations given in the problem:
Keq = ([oxaloacetate] * [NADH])/([malate] * [NAD+])
Plugging in the given concentrations, we get:
Keq = (0.290 * 68)/(1.31 * 170) = 0.00588
Now we can calculate ΔG°' using the first equation:
ΔG°' = -RTln(Keq) = - (8.314 J/mol*K) * (310 K) * ln(0.00588) = 44.2 kJ/mol
However, the given value for ΔG°' is 29.7 kJ/mol. To calculate the actual free energy change for the reaction at the given concentrations, we can use the equation:
ΔG = ΔG°' + RTln(Q)
Where Q is the reaction quotient, which is calculated using the same equation as Keq, but with the actual concentrations instead of the equilibrium concentrations.
Plugging in the given concentrations, we get:
Q = (0.290 * 68)/(1.31 * 170) = 0.00588
Now we can calculate ΔG:
ΔG = 29.7 kJ/mol + (8.314 J/mol*K) * (310 K) * ln(0.00588) = 57.6 kJ/mol
Therefore, the free energy change for the malate dehydrogenase reaction at pH 7 and 37.0°C, with the given concentrations, is 57.6 kJ/mol.
To know more about free energy change visit:

https://brainly.com/question/31170437

#SPJ11

The net diffusion of K out of the neuron is reduced when the extracellular K concentration is increased.

Extracellular K ions have a vital role to play in maintaining the correct balance of ions that are present within the neurons. The net diffusion of K out of the neuron is reduced when the extracellular K concentration is increased. It can be explained by the Nernst Equation.

According to the Nernst equation, there is a direct relationship between the ion concentration and the potential across the membrane. If the extracellular K ion concentration is higher, the potential difference required to create an equilibrium state is higher. This is due to the fact that the membrane potential is proportional to the concentration of ions across the membrane.

If the concentration gradient is smaller, the equilibrium potential will be lower, meaning the net diffusion of ions out of the neuron will be reduced.

Therefore, increasing extracellular K will reduce the net diffusion of K out of the neuron.

To learn more about ions :

https://brainly.com/question/13692734

#SPJ11

The correct form of the first-order integrated rate law for one reactant is ln[A]t - ln[A]0 = kt.

This equation explains the relationship between the concentration of a reactant at a given time (A[t]) and the initial concentration of the reactant (A[0]). The equation states that the natural logarithm of the concentration of the reactant at a given time minus the natural logarithm of the initial concentration of the reactant is equal to the rate constant (k) multiplied by time (t).

The first-order rate law states that the rate of a reaction is directly proportional to the concentration of the reactant. The integrated form of the rate law helps to calculate the concentration of the reactant at any given time during the reaction.

To know more about reactant, visit:

https://brainly.com/question/17096236

#SPJ11

When aqueous solutions of ammonia and vinegar (which contains acetic acid) are mixed, a chemical reaction occurs to form ammonium acetate. This reaction is a neutralization reaction, where the acidic and basic components react to produce a salt. The resulting solution will have a different pH compared to the original solutions and will contain ammonium acetate, which is a salt commonly used in various applications.

Ammonia (NH₃) is a weak base, and vinegar contains acetic acid (CH₃COOH), which is a weak acid. When these two solutions are mixed, a neutralization reaction takes place. The acetic acid donates a proton (H⁺) to ammonia, forming ammonium ions (NH₄⁺) and acetate ions (CH₃COO⁻). This reaction can be represented as:

NH₃ + CH₃COOH → NH₄⁺ + CH₃COO⁻

The resulting product, ammonium acetate (NH₄CH₃COO), is a salt that remains dissolved in the aqueous solution. The pH of the resulting solution will be different from the original solutions, depending on the concentrations of ammonia and vinegar used. Ammonium acetate can be used in various applications, such as a buffering agent or as a source of ammonia in organic synthesis.

To know more about  ammonia click here:

brainly.com/question/12276882

#SPJ11

2 kg of expanded polyethylene has a volume of 2.17 liters.

Given that,

Density = 0.9g/cm³

Mass = 2kg = 2000g

Density is the substance's mass per unit of volume. Although the Roman letter D may also be used, the sign most frequently used for density is ρ (the lowercase Greek letter rho). A substance's density changes as a function of pressure and temperature. With solids and liquids, this variance is often slight, but for gases, it is much more pronounced.

Density = Mass ÷ Volume

0.92 = 2000 ÷ Volume

Volume = 2000 ÷ 0.92

Volume = 2.17 liters.

Hence, 2 kg of expanded polyethylene has a volume of 2.17 liters.

To learn more about density, refer to:

https://brainly.com/question/26364788

#SPJ4

Your question is in Spanish. The English translation of the question is:

Calculate the volume of 2 kg of expanded polyethylene in liters. ( Density = 0.92g/cm³ )

Answer:

T₁ = 563.19 K

Explanation:

Given data:

Initial volume = 359 mL

Final volume = 269 mL

Final temperature = 422 K

Initial temperature = ?

Solution:

The given problem will be solve through the Charles Law.

Charles Law:

According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.

Mathematical expression:

V₁/T₁ = V₂/T₂

V₁ = Initial volume

T₁ = Initial temperature

V₂ = Final volume  

T₂ = Final temperature

Now we will put the values in formula.

V₁/T₁ = V₂/T₂

T₁ = V₁T₂ / V₂

T₁ = 359 mL × 422 K / 269 mL

T₁ = 151498 mL.K / 269 mL

T₁ = 563.19 K

Answer:

making drinks, purifying water

Explanation:

Answer:

Biology

Explanation:

Biology is the study of all living beings. From the smallest algae or micro organism to the biggest living being is all covered under biology. How micro organisms live, how do they function and how they affect other living beings is studied in biology.

Answer:

Micro bioligist

Explanation: hope this helps

Mixing sugar and water is a physical change because it involves the dispersion and uniform distribution of sugar molecules in water without altering their chemical composition.

When sugar (sucrose) and water are mixed, it undergoes a physical change rather than a chemical change. A physical change refers to a transformation in the physical properties of a substance without altering its chemical composition.

In the case of mixing sugar and water, the sugar molecules disperse and become uniformly distributed throughout the water. This results in the formation of a homogeneous mixture known as a solution. The sugar molecules do not undergo a chemical reaction with the water molecules, nor do they break down or form new substances.

The physical change can be reversed by evaporation, where the water molecules can be separated from the sugar molecules, leaving behind the original sugar crystals. The chemical identity of both sugar and water remains the same throughout the process.

learn more about physical change here:

https://brainly.com/question/17931044

#SPJ11

Answer:

c

Explanation:

The values of balanced chemical reaction is w = 1, x = 6, y = 3, and z = 2

To balance the chemical equation:

1. Balancing nitrogen (N):

There are three nitrogen atoms on the left side (Ba₃N₂), so we need to place a coefficient of 3 in front of NH₃:

w Ba₃N₂ + x H₂O → y Ba(OH)₂ + 3 z NH₃

2. Balancing hydrogen (H):

There are six hydrogen atoms on the left side (2 × 3), so we need to place a coefficient of 6 in front of H₂O:

w Ba₃N₂ + 6 H₂O → y Ba(OH)₂ + 3 z NH₃

3. Balancing barium (Ba):

There are three barium atoms on the left side (3 × Ba₃N₂), so we need to place a coefficient of 3 in front of Ba(OH)₂:

w Ba₃N₂ + 6 H₂O → 3 y Ba(OH)₂ + 3 z NH₃

4. Balancing oxygen (O):

There are six oxygen atoms on the right side (6 × OH), so we need to place a coefficient of 3 in front of Ba(OH)₂:

w Ba₃N₂ + 6 H₂O → 3 Ba(OH)₂ + 3 z NH₃

Now the equation is balanced with the following coefficients:

w Ba₃N₂ + 6 H₂O → 3 Ba(OH)₂ + 3 z NH₃

Therefore, w = 1, x = 6, y = 3, and z = 2 would satisfy the balanced chemical equation.

Learn more about balanced chemical reactions at https://brainly.com/question/26694427

#SPJ11

Answer:

10. D

9. A

8. A or B

Explanation:

10. Calcium has 20 electrons, but the Calcium ion has 18 electrons.

9. The mass of electrons are negligible.

8. Electrons have a very small mass where some consider it to have no mass.

In 1.2 x \(10^{24}\) formula units of \(Li_{2} (SO)_{4}\), there are roughly 1.993 moles of

\(Li_{2} (SO)_{4}\).

Using Avogadro's number, or 6.022 x \(10^{23}\) molecules/mol, we can calculate the number of moles of Li2SO4 in 1.2 x \(10^{24}\)formula units.

First, we need to figure out how many moles of \(Li_{2} (SO)_{4}\)  are needed to equal 1.2 x \(10^{24}\)  formula units:

Formula units equal 6.022 x \(10^{23}\) per mole of \(Li_{2}(SO)_{4}\).

As a result, there are: 1.2 x \(10^{24}\) moles of \(Li_{2}(SO)_{4}\) in the formula units.

1.993 moles are equal to 1.2 x \(10^{24}\) formula units / 6.022 x \(10^{23}\) formula units/mol.

Hence, 1.2 × \(10^{24}\) formula units of \(Li_{2} (SO)_{4}\) contain about 1.993 moles.

To learn more about moles visit:

brainly.com/question/26416088

#SPJ9

4K+O2-----------2K2O

The arrangement of 5 electron groups around a central atom is trigonal bipyramidal. This molecular geometry consists of three groups lying in a trigonal plane around the central atom, with bond angles of approximately 120°. The other two groups lie above and below this plane, creating bond angles of approximately 90°.

Molecular geometry refers to the three-dimensional arrangement of atoms in a molecule. It describes the spatial orientation and relative positions of the atoms, including bond lengths, bond angles, and overall shape of the molecule.

The molecular geometry is determined by the arrangement of electron pairs around the central atom, considering both bonding and nonbonding electron pairs. The electron pairs repel each other, and the molecule adopts a shape that minimizes this repulsion, resulting in specific bond angles and molecular shapes.

To learn more about Molecular geometry, visit:

https://brainly.com/question/31993718

#SPJ11

An ecosystem is made up of living and non-living components that interact with each other. Organisms within an ecosystem rely on each other for food and energy in a complex web of relationships.

In a grassland ecosystem, the energy pyramid demonstrates how energy flows from one trophic level to the next, starting with primary producers and ending with apex predators.
At the base of the energy pyramid are the primary producers, which are plants such as grasses. These producers use the energy from the sun to create their own food through photosynthesis. The next level of the energy pyramid is made up of herbivores, which are organisms that eat plants for energy. Examples of herbivores in a grassland ecosystem might include rabbits, deer, or antelopes.
Above the herbivores are the secondary consumers, which are carnivores that eat the herbivores for energy. In a grassland ecosystem, secondary consumers might include coyotes, foxes, or hawks. At the top of the energy pyramid are the apex predators, which are carnivores that have no natural predators. These apex predators might include lions or wolves in a grassland ecosystem.
When organisms within an ecosystem die, their bodies are decomposed by bacteria and fungi, which return nutrients back to the soil for use by the primary producers. This process is an essential part of the ecosystem's energy flow and nutrient cycling. By understanding the energy pyramid of a grassland ecosystem, we can better understand the interdependence of organisms within the ecosystem and how energy is transferred through the food chain.

To know more about Ecosystem visit:
https://brainly.com/question/13979184
#SPJ11

Answer:

The relation between individual and society is very close. Essentially, “society” is the regularities, customs and ground rules of antihuman behavior. These practices are tremendously important to know how humans act and interact with each other. Society does not exist independently without individual.

Explanation:

Answer:

Explanation:

mass of 1mole of brick =  mass of 1 brick x avagadro number

= 4 kg x 6.022 x 10^23 bricks  = 2.4 x 10^24 kg

No. of moles of bricks have a mass equal to the mass of the earth

= mass of earth / mass of 1 mole of brick

= [ 6 x 10^27 ]  /  [ 2.4 x 10^24 ]

= 2.5 x 10^3

= 2500 moles

Answer:

24 molecules of CO2

Explanation:

Each molecule of CO2 has only one carbon atom, therefore we need 24 CO2 molecules to get the 24 carbon atoms, as requested.