As an environmental engineer how would you apply the process of separating mixtures to clean up a polluted beach? What would you do first? Second? Third? What equipment would you need? Explain your process.

Answer:

burrowing in sandy or muddy substrates.

Explanation:

sand dollar also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits.Sand dollars can also be called "sand cakes" or "cake urchins".

Sand dollars live beyond the low water line on top of or beneath the surface of sandy or muddy areas. Sand dollars are frequently found together on the ocean bottom.

Answer:

a. reactants break bonds and form new bonds to make new substances.

I took test K12 :)

In a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.

The chemical reaction is the way in which one substance reacts against another, that is, they are thermodynamic processes of transformation of matter.

These reactions involve two or more substances (reactants), which change significantly in the process, and can consume or release energy to generate two or more substances called products.

Therefore, we can conclude that in a chemical reaction occurs that reactants break bonds and form new bonds to make new substances.

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Answer: The equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]

Explanation:

Molar mass of a substance is defined as the mass of one mole of a substance.

We know that:

Molar mass of carbon atom = 12.01 g/mol

Given mass of carbon atom = 126 grams

Applying unitary method:

12.01 grams of carbon occupies 1 mole

So, 126 grams of carbon will occupy = [tex]\frac{1mol}{12.01g}\times 126g[/tex]

According to mole concept:

1 mole of an element contains [tex]6.022\times 10^{23}[/tex] number of atoms

So, [tex]\frac{1mol}{12.01g}\times 126g[/tex] of carbon will contain = [tex]\frac{1mol}{12.01g}\times 126g\times \frac{6.022\times 10^{23}}{1mol}=\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex] number of atoms

Hence, the equivalence factor set that should be used is [tex]\frac{126g}{12.01g}\times 6.022\times 10^{23}[/tex]

Answer:

The final temperature of water = 52.6 C

Explanation:

The heat (q) lost or gained by a substance of mass m corresponding to a temperature change from T1 to T2 degrees is given as:

[tex]q = m*c*(T2-T1)[/tex]-----(1)

where c = specific heat of the substance

For water, c = 4.18 J/gC

In the given situation:

Heat lost by 70.3 g of water = Heat gained by 100.0 g of water

Based on equation (1) and considering that heat lost is negative:

[tex]-70.3*c*(T2-89.0)=100.0*c*(T2-27.0)[/tex]

Solving the above equation gives:

T2 = 52.6 C

To solve for the number of moles, we simply have to use the Avogadros number which states that there are 6.022 x 10^23 molecules per mole. Therefore:

number of moles = 6.67 X 10^40 chlorine molecules / (6.022 x 10^23 molecules / mole)

number of moles = 1.108 x 10^17 moles

Answer: 1.108 x 10^17

Explanation:

Final answer:

To find the molarity of a 10.2% glucose solution with a density of 1.03 g/ml, you calculate the mass of glucose in 1 L of solution to be approximately 105.06 g, convert this to moles, and find the molarity to be 0.583 M.

Explanation:

The question asks: What is the molarity of a 10.2 % by mass glucose (C₆H₁₂O₆) solution? (the density of the solution is 1.03 g/ml). To find the molarity, first identify the mass of glucose in a given volume of the solution. Assuming we have 1000 mL (or 1 L) of solution for simplicity, with a density of 1.03 g/mL, the total mass of the solution would be 1030 g. Given that 10.2% is by mass, the mass of glucose is 10.2% of 1030 g, which equals 105.06 g.

To find the molarity, we need to convert the mass of glucose to moles by dividing by its molar mass (180.156 g/mol for C₆H₁₂O₆). This equals approximately 0.583 moles of glucose. Since molarity is defined as moles of solute per liter of solution, and our assumed volume of the solution is 1 L, the molarity of the glucose solution is therefore 0.583 M.

The molarity of a 10.2% by mass glucose solution with a density of 1.03 g/mL is approximately 0.583 M.

The solution's volume and the number of moles of glucose were calculated to determine this value.

To find the molarity of a 10.2% by mass glucose (C₆H₁₂O₆) solution with a density of 1.03 g/mL, follow these steps:

Therefore, the molarity of the solution is approximately 0.583 M .

Correct question is: What is the molarity of a 10.2 % by mass glucose (C₆H₁₂O₆) solution? (the density of the solution is 1.03 g/ml .)?

Answer: KCl

Explanation: Potassium [K]  has an atomic no of 19 and the electronic configuration is:

[tex]K :1s^22s^22p^63s^23p^64s^1[/tex] tends to get stable by losing one electron and forming [tex]K^+[/tex]

Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :

[tex]Cl :1s^22s^22p^63s^23p^5[/tex] tends to get stable by gaining one electron and forming [tex]Cl^-[/tex]

[tex]K^+[/tex] and [tex]Cl^-[/tex] attract each other and form an ionic bond. As we have a chlorine molecule that is two atoms of chlorine are present, 2 atoms of potassium will react to form 2 moles of KCl.

[tex]2K+Cl_2\rightarrow 2KCl[/tex]

Determine the molar mass of an unknown compound by rearranging the ideal gas law to solve for the number of moles and then dividing the sample mass by the number of moles.

You calculate the molar mass of a gas with the concept that at a consistent temperature and pressure, the molar volume of a gas is constant. The ideal gas law (PV = nRT), where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature, can be used under these conditions. Rearranging the equation and substituting molar mass for mass and number of moles gives you an equation to calculate molar mass.

First, convert volume from milliliters to liters, so 245 ml becomes 0.245 L. Using R as 0.0821 (atm L)/(mol K), the equation will yield the number of moles of the gas. Now, divide the given sample mass (0.465 g) by the calculated number of moles to obtain the molar mass. The correct choice among 26.3 g/mol, 81.8 g/mol, 33.9 g/mol, 38.0 g/mol, 12.2 g/mol is calculated through the steps described above.

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Protons and neutrons are relatively the same mass, whereas electrons are much lower in mass.

Protons and neutrons have an equal mass which is equal to 1.67262 × 10⁻²⁷ kg.

Whereas electrons have almost negligible mass. The mass of an electron is 1/1,836 of a proton.

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Joules is the correct unit for measuring average kinetic energy of a substance, 5.8 km is equal to 5,800,000 mm, the density values mention precision but lack accuracy, scientific laws are descriptions of observed phenomena, and Graham's equation is a law based on description of what occurs.

The unit used for measuring the average kinetic energy of a substance is joules (A).

Converting 5.8 km to millimeters results in 5,800,000 mm (D).

The calculated density values of a metal sample (2.9 g/mL, 2.8 g/mL, and 3.0 g/mL) compared to the true density of 2.1 g/mL show that the set is precise but not accurate (C), as the measurements are close to each other but not to the true value.

A correct representation of scientific laws is that they are descriptions of observed phenomena, generally accepted as facts (D).

Thomas Graham's mathematical equation on the relationship between gas molecule mass and effusion rate is a law because it describes what happens without explaining why it happens (A).

The theory that the pressure of a gas increases as its volume decreases because molecules have to move a shorter distance to hit the container's walls falls under a microscopic description of chemical behavior, as it deals with the behavior of individual gas molecules.

Final answer:

The flame from the match or splint is extinguished when sodium carbonate reacts with HCl because carbon dioxide gas is produced. CO2 is heavier than air and does not support combustion, therefore it surrounds the flame, displacing the oxygen and putting the flame out.

Explanation:

The flame of the burning match or splint goes out when sodium carbonate (Na2CO3) reacts with hydrochloric acid (HCl) due to the production of carbon dioxide (CO2). This chemical reaction is a typical acid-base reaction where sodium carbonate acts as a base and hydrochloric acid acts as the acid. When these substances are combined, the sodium carbonate is neutralized, and one of the products formed is carbon dioxide gas. Carbon dioxide is a well-known fire extinguisher; it does not support combustion like oxygen does. Therefore, when carbon dioxide is released during the reaction, it displaces the oxygen around the flame, causing the flame to be extinguished.

A similar observation can be made in an experiment setup using lime water and carbon dioxide. Lime water turns milky in the presence of carbon dioxide, which is a simple test to indicate the production of CO2 gas. Additionally, in a combustion analysis, CO2 is produced when a compound containing carbon undergoes combustion. In this scenario, however, the carbon dioxide is resulting from a neutralization reaction rather than combustion but still plays a similar role in snuffing out the flame.

The number of hydrogen atoms which are compared to the number of oxygen atoms in each amino acid because:

A hydrogen atom is an atom of hydrogen which contains one positively charged proton and a negatively charged electron and is held together by a nucleus.

As a result of this, when comparing the number of hydrogen atoms and the number of oxygen atoms, it is important to note that they have different number in the R group and each R group may be different in the number of atoms.

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The hydrolysis of ATP involves breaking it down into ADP, an inorganic phosphate, and energy using a water molecule. The chemical equation is ATP + H₂O → ADP + Pi + energy. This reaction releases energy necessary for cellular functions.

The reaction described is a hydrolysis reaction, where a water molecule is used to break down ATP. The chemical equation for this reaction is:

ATP + H₂O → ADP + Pi + energy

In this reaction:

Hydrolysis releases the energy stored in the high-energy bonds between ATP's phosphate groups. ATP is like a rechargeable battery, where the breakdown into ADP and Pi releases energy needed for cellular processes, and can be regenerated back into ATP.

Answer:

The answer is D. Pure Substance

Explanation:

The difference in the size of their particles

Heterogeneous mixtures are easier to separate because the particles sizes of the components of the mixture differ greatly and such the separation technique used can take advantage of this property.

An example frequently used is Sand and water. Simply filtration with filter paper and funnel brings about this separation as the water particles are small enough to pass through the paper, however the sand particles are too large and are stopped from passing. After a few moments, the water and sand would have been fully separated.

Homogenous mixtures are harder to separate because the particles sizes are close in relation to each other and as such this property would not be ideal for the separation technique used.

This is when the experimenter will turn to other properties such as boiling points, melting points and solubility in order to separate them.

An example would be to separate salt from water.

The technique preferred is evaporation as the boiling points of H2O(100oC) and NaCl(1413oC) are far apart and thus would cause the evaporation of the water longer before the NaCl begins to evaporate.

Lewis structures show only valence electrons. They use dots and lines to represent valence electrons and bonds, respectively. By drawing Lewis structures, we can understand how atoms form bonds and predict the behavior of molecules.

Lewis structures show only valence electrons. Valence electrons are the outermost electrons in an atom, and they are the ones involved in bonding. Lewis structures use dots and lines to represent valence electrons and bonds, respectively.

The dots around the atomic symbol represent the valence electrons of the element. For example, carbon has 4 valence electrons, so its Lewis structure would have 4 dots around it. Lines are used to represent bonds, where each line represents a pair of shared electrons.

By drawing Lewis structures, we can understand how atoms form bonds with each other and how electrons are shared between atoms in a molecule. This helps us determine the shape and properties of molecules and predict their behavior.

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To separate lauric acid from alpha naphthol, solvent extraction can be used.

To separate lauric acid from alpha naphthol, one method that can be used is solvent extraction. Lauric acid is insoluble in water but soluble in organic solvents such as ether or ethanol, while alpha naphthol is soluble in water. By adding the mixture of lauric acid and alpha naphthol to an organic solvent, the lauric acid will dissolve in the solvent while the alpha naphthol remains in the water. After separation, the solvent can be evaporated to obtain the separated lauric acid.

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