50 POINTS QUICK Click to review the online content. Then answer the question(s) below, using complete sentences. Scroll down to view additional questions.
Online Content: Site 1

What goods did the Ubaidian people produce? Describe their agricultural techniques. (Site 1)

Difference between crystallization and evaporation to dryness : crystallization is the formation of solid crystal from liquid whereas evaporation is the formation of vapor from liquid.

Crystallization is defined as the the process in which pure solid separates in the form of crystal from solution .

Evaporation to dryness is  used to separate solute thermally when soluble solid does not decompose on heating. crystallization is better than evaporation to dryness because in the process of evaporation some solid in the mixture get decomposed leaving impurities. during the process of evaporation.

The major difference is that in crystallization is the formation of solid crystal from liquid whereas evaporation is the formation of vapor from liquid.

To learn more about crystallization and evaporation here

https://brainly.com/question/13175930

#SPJ1

Watersheds or drainage basins can be defined as the areas where the water from precipitation collects and then drains off to a common place, such as streams, rivers or lakes.

Watersheds are divided by continental boundaries. These are the geographical boundaries and have no relation to the set political boundaries.

Watersheds collect the precipitation as well as surface water and acquifiers. They include the runoffs too. All of this is leads to a common outlet.

Watersheds can be small as well as quite big. There is no limitation to their sources and outlet. Thus, the statement 'watersheds are limited to bays, lakes, rivers, and other large bodies of water' is not correct.

Hence, the correct answer is option c.

https://brainly.com/question/20823644

Answer: 0.8

Explanation: density is mass/volume

200/250=0.8

the oxidation reaction between oxygen and sodium produces sodium oxide. In many cases, an element may form more than one oxide.

Explanation:

The process that is physical changes is:

A physical change can be described as a type of  change  that take place in physical without chemical reaction as opposed to chemical change.

They are changes that are  usually reversible it should be noted that physical change do not  involve the alterations  as regards the  chemical make up of a particular  substance  and as a result of this , in physical change, there is   no formation of new product.

Therefore, The process that is physical changes is mixing frozen orange juice concentrate with water

Read more about physical changes here:

https://brainly.com/question/13056570

#SPJ1

(a) Corrosion Penetration Rate (CPR) is a measurement of the thickness of a material's corrosion layer in terms of linear millimeters per year. Corrosion Penetration Rate is an important parameter that is widely used in the corrosion field to estimate the corrosion rate of a metal.

The penetration rate is determined by exposing a metal sample to the corrosive environment and measuring the quantity of metal that has been lost due to corrosion over a certain period of time. The formula used to calculate CPR is: CPR = Weight loss of the sample (mg) x 31556926.0 / A x D x t Where, A= Surface area of the sample (m²), D= Density of the sample (g/cm³), t= Exposure time in seconds

(b)Deterioration mechanism of polymetric materials:

(i) Thermal degradation: It is the process in which chemical decomposition occurs when a polymer is exposed to elevated temperatures, which can result in the loss of essential properties of the polymer.

(ii) Weathering: The process by which a polymer's structure and properties are altered as a result of exposure to the natural elements is referred to as weathering.

(c) Consequences of corrosion:

(i) Riveting a steel plate with copper rivets: When riveting a steel plate with copper rivets, galvanic corrosion is caused as a result of the contact between copper and steel. The steel will corrode more quickly than it would if it were in contact with a material that is less reactive than copper.

(ii) Connecting buried steel pipework to zinc plates: Connecting buried steel pipework to zinc plates can cause galvanic corrosion. Because zinc is more reactive than steel, the zinc plate corrodes and prevents the steel pipe from corroding. As a result, the zinc plate will corrode away, leaving the steel pipe vulnerable to corrosion.

(d) One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Nid'ions, other half is a cadmium electrode immersed in a Cda solution. If the cell is a standard one:

(i) Spontaneous overall reaction: Ni(s) + Cd²⁺ (aq) → Cd(s) + Ni²⁺ (aq)

(ii) The voltage generated by the cell is: E°cell = E°cathode - E°anode

E°cell = E°Cd - E°Ni

E°cell = (-0.40) - (-0.25)

E°cell = -0.15V

Therefore, the voltage generated by the cell is -0.15V.

To know more about Corrosion, refer

https://brainly.com/question/1596056

#SPJ11

Phospholipids are amphipathic molecules, meaning they have both hydrophobic and hydrophilic regions. In an aqueous environment like water, phospholipids arrange themselves into a bilayer structure, with the hydrophobic tails oriented inward and the hydrophilic heads facing outward towards the water.

In a hydrophobic substance like methane, phospholipids would not form a bilayer structure because there would be no polar environment for the hydrophilic heads to interact with. Instead, phospholipids would likely aggregate or create different structures to minimize their exposure to the hydrophobic environment.

Forming a bilayer structure is crucial for the function of cell membranes, as it provides a selectively permeable barrier. In a hydrophobic substance like methane, the absence of a bilayer structure would result in increased membrane permeability. The hydrophobic substance could penetrate and disrupt the lipid structure more efficiently, compromising the membrane's ability to regulate the passage of ions, molecules, and other substances.

Therefore, the absence of a polar environment like water would affect the formation of the phospholipid bilayer.

Learn more about amphipathic molecules here:

https://brainly.com/question/12070285

#SPJ 4

The bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Bond order is defined as the number of electrons in bonding molecular orbitals minus the number of electrons in antibonding molecular orbitals divided by two. As a result, we may determine the bond order of this diatomic particle by the formula: Bond order = (number of bonding electrons - number of antibonding electrons) / 2

Bond order = (8 - 5) / 2

Bond order = 1.5.

This diatomic molecule, according to the bond order, is a stable molecule since the bond order is greater than 1, indicating that it is a double bond. The molecule has an overall bond strength that is greater than a single bond, but not as strong as a triple bond. So therefore he bond order for a second-period diatomic particle containing five electrons in antibonding molecular orbitals and eight electrons in bonding molecular orbitals is 1.5

Learn more about bond order at:

https://brainly.com/question/30641030

#SPJ11

Explanation:

To solve the problem, we can use the freezing point depression equation:

ΔT = Kf · molality

where ΔT is the change in freezing point, Kf is the freezing point depression constant, and molality is the concentration of the solution in moles of solute per kilogram of solvent.

In this case, we're looking for the freezing point of a solution of C5H4 in benzene, given that the freezing point of pure benzene is 5.50 °C, and the freezing point depression constant is 5.12 °C/m.

First, let's calculate the molality of the solution:

molality = moles of solute / kilograms of solvent

To find the moles of solute, we need to know the molar mass of C5H4. By looking it up in a periodic table, we find:

Molar mass of C5H4 = 64.09 g/mol

The problem doesn't tell us how much solute was added, but it does give us the concentration of the solution as 0.41 m (which means 0.41 moles of C5H4 per kilogram of benzene). Therefore:

molality = 0.41 moles / 0.998 kg ≈ 0.411 mol/kg

Now we can calculate the freezing point depression:

ΔT = Kf · molality

ΔT = 5.12 °C/m · 0.411 mol/kg ≈ 2.10 °C

The freezing point depression tells us how much the freezing point of the solution is lowered compared to the freezing point of pure benzene. Therefore, the freezing point of the solution is:

Freezing point = 5.50 °C - 2.10 °C = 3.40 °C

Therefore, the freezing point of the 0.41 m solution of C5H4 in benzene is 3.40 °C.

Answer:

Explanation:

6.         p⁺      e⁻

Ca²⁺    20     18

F⁻          9      10

O²⁻        8      10

Na⁺       11      10

7. Physical properties of matter are properties that can be measured or observed without matter changing to an entirely different substance. These include odor, boiling point, melting point, density, electrical conductivity and heat conductivity.

Separation of mixture:

Chromatography involves solvent separation on a solid medium.

Distillation takes advantage of differences in boiling points.

Evaporation removes a liquid from a solution to leave a solid material.

Filtration separates solids of different sizes.

Funnel partitioning with solvents. Solvent dissolves one component but not the other.

8.Bulk Elements => Carbon, Hydrogen, Oxygen, Nitrogen, Sulfur & Phosphouous

Microminerals are those minerals needed in less than 100 mg quantities. Trace minerals or trace elements are usually needed in microgram quantities. Microminerals include iron, zinc, copper, iodine, fluoride, chromium, cobalt, selenium, manganese, and molybdenum.

Diatomic Molecules => H₂, N₂, O₂, F₂, Cl₂, Br₂, I₂

9. Electron Configurations

    Na: 1s²2s²2p⁶3s¹ => valence = 3s¹

    N:   1s²2s²2p³ => valence = 2s²2p³

    Al:  1s²2s²2p⁶3s²3p¹ => valence = 3s²3p¹

Valence is the highest principle quantum number (or, principle energy level  ~ ring) in the electron configurations.

10.moles of glucose = 450g/180.16 g/mol =2.50 moles

   C₂H₆O₂ = 2(12) + 6(1) + 2(16) = 24 + 6 + 32 = 62 g/mole

The gas having higher pressure at room temperature, is P = 6.11 atm.

What is the ideal gas law?

The general gas equation, often known as the ideal gas law, is the equation of state for a hypothetical ideal gas. It has a number of limitations, but it provides a decent approximation of the behavior of numerous gases under various circumstances.

According to the ideal gas equation,

PV =nRT

For O₂,

Number of moles of oxygen gas = 5.00 g /32 g/mol = 0.156 moles

P =?

V = 5 L

n =  0.156 moles

T = 25 + 273 = 298 K

R = 0.082 atmLK-1mol-1

P = nRT/V

P =  0.156 moles × 0.082 atmLK-1mol-1 × 298 K/5 L

P = 0.76 atm

For He,

Number of moles of He = 5/4 g/mol = 1.25 moles

P =?

V = 5 L

n = 1.25 moles

T = 25 + 273 = 298 K

R = 0.082 atmLK-1mol-1

P = nRT/V

P =1.25 moles × 0.082 atmLK-1mol-1 × 298 K/5 L

P = 6.11 atm

Hence the gas having higher pressure at room temperature is He.
To learn more about gas laws follow the link:
https://brainly.com/question/25290815
#SPJ4

The final temperature of both substances at thermal equilibrium is 51.96°C.

Solution:

31.91 T =10374.27

T= 325.11 K or T= 51.96 °c

Final equilibrium Temperature (T) = 51.96°C.

Two systems are said to be in thermal equilibrium when they are in contact with each other and there is no energy flow between them. Simply put, thermal equilibrium means that two systems are at the same temperature. The zero law of thermodynamics states that if two systems are in thermodynamic equilibrium with his third system, then the original He said that the two systems are in thermal equilibrium with each other.

Learn more about Thermal equilibrium here:- https://brainly.com/question/14904792

#SPJ4

The finest website for you may rely on your individual requirements and interests. There are several websites that provide O level chemistry notes.

For students seeking free access to top-notch online resources for basic, organic, inorganic, and physical chemistry notes, check ChemistNotes.com. You can get all of the Organic & Inorganic Chemistry Notes, from basic notes to advanced level notes, in one location.

An efficient and successful technique to take notes for the sciences is to use the Cornell Note-taking System. Your paper should be divided into two columns in general. You can easily review for tests using this technique, keep your notes organised, and swiftly sum up a lecture.

To know more about chemistry visit:-

https://brainly.com/question/14387251

#SPJ1

Answer:

Sharing of electrons such that each atom attains an octet

The density of xenon (Xe) at 61 °C and 598 mmHg is 14.38 g/L.

The ideal gas equation can be used to calculate the density of xenon (Xe) at a given temperature and pressure. To begin, let's define the variables.P = 598 mmHgT = 61 °CR = 0.08206 L · atm/mol ·KAtomic weight of Xe = 131.3

To calculate the density of Xe, we must first convert the given pressure and temperature into standard units. The temperature must be in kelvin and the pressure must be in atmospheres (atm).So, T = 61 + 273.15 = 334.15 K and P = 598/760 = 0.7868 atm.Using the ideal gas equation PV = nRT, we can calculate the number of moles of Xe present: (0.7868 atm) × V = n × (0.08206 L · atm/mol · K) × (334.15 K)n

= (0.7868 V) / (27.011 × 0.08206 × 334.15) = (0.7868 V) / 7.15

The atomic weight of xenon (Xe) is 131.3 g/mol.

Therefore, the mass of Xe in grams is:m = 131.3 g/mol × n = 131.3 g/mol × [(0.7868 V) / 7.15] = 14.38 V g

Dividing the mass by the volume gives us the density in g/L:

Density of Xe = m / V = (14.38 V g) / V = 14.38 g/L

The density of xenon (Xe) at 61 °C and 598 mmHg is 14.38 g/L.

To know more about xenon visit:

brainly.com/question/5516586

#SPJ11

Answer:

Explanation: Coefficients and Subscripts There are two types of numbers that appear in chemical equations. There are subscripts, which are part of the chemical formulas of the reactants and products; and there are coefficients that are placed in front of the formulas to indicate how many molecules of that substance is used or produced.

Explanation:

A mixture is made of two or more substances that are not chemically combined whereas a compound is made of 2 or more elements that are chemically combined. The elements that make up the compound are combined in fixed ratios.

The reason why the methyl red test is read immediately after the addition of the methyl red reagent, while the Voges-Proskauer test is read up to 60 minutes after the addition of VP reagents A and B, is due to the differences in the chemical reactions taking place in each test.

- If the pH is less than 4.4, it indicates that the organism produces stable acids as a byproduct of glucose fermentation, and the test is considered positive.The color change occurs immediately, so the test can be read right after the addition of the reagent.

- The Voges-Proskauer test is used to detect the production of acetoin, a precursor of 2,3-butanediol, by organisms during glucose metabolism.VP reagents A and B are added to the test tube after incubation. These reagents react with acetoin to produce a red color.

To know more aboutt that methyl visit:

https://brainly.com/question/31490464

#SPJ11

A carbonyl group polar because b. oxygen is significantly more electronegative than carbon.

The carbonyl group is a functional group in organic chemistry consisting of a carbon atom double-bonded to an oxygen atom. C=O is the formula for a carbonyl group, this structure is present in many ketones and aldehydes, as well as carboxylic acids, esters, and amides. Oxygen is much more electronegative than carbon, and as a result, the electrons in the carbon-oxygen double bond are more strongly attracted to the oxygen atom. Because the electrons are attracted to the oxygen atom, the carbon-oxygen bond becomes polarized, with oxygen becoming negatively charged and carbon becoming positively charged.

The carbonyl group is an important functional group in biochemistry since it is found in a variety of biomolecules like carbohydrates, lipids, and nucleic acids. Because of its polarity, it can engage in hydrogen bonding with other functional groups in these molecules, such as hydroxyl groups. A carbonyl group polar because b. oxygen is significantly more electronegative than carbon.

Learn more about carbonyl group at:

https://brainly.com/question/13564853

#SPJ11

To dilute the 0.200 M HCl solution to 0.150 M solution, 166.67 mL of water is needed to be added to the solution.

To dilute a solution, we can use the dilution equation:

M₁V₁ = M₂V₂

where M₁ and V₁ are the initial molarity and volume of the solution, and M₂ and V₂ are the final molarity and volume of the solution after dilution.

In this case, we are given M₁ = 0.200 M, V₁ = 500 mL, and M₂ = 0.150 M. We need to solve for V₂ to find the final volume of the solution after dilution, and then subtract V₁ from V₂ to find the amount of water that needs to be added.

0.200 M × 500 mL = 0.150 M × V₂

V₂ = (0.200 M × 500 mL) / 0.150 M

V₂ = 666.67 mL

So, the final volume of the solution after dilution should be 666.67 mL.

To find the amount of water that needs to be added, we can subtract the initial volume from the final volume:

666.67 mL - 500 mL = 166.67 mL

Therefore, we need to add 166.67 mL of water to the 500 mL of 0.200 M HCl solution to dilute it to a 0.150 M solution.

Learn more about dilution here: https://brainly.com/question/24881505.

#SPJ11

He will arrive at the second city on time

Using the formula for calculating speed expressed as:

Distance = Speed * time

Given the following parameters

Speed = 65km/hr

Time = 3 hours (from noon to 3PM)

Get the distance covered by Isaiah;

Distance = 65 * 3

Distance = 195km > 186km

Since the distance covered by Isaiah is greater than the distance from one city to another city, hence he will arrive at the second city on time

What is Speed?

The speed at which an object's location changes in any direction. The distance traveled in relation to the time it took to travel that distance is how speed is defined. Since speed simply has a direction and no magnitude, it is a scalar quantity.

Therefore,

186km at 3:00 the speed limit is 65km/h

He will arrive at the second city on time

Using the formula for calculating speed expressed as:

Distance = Speed * time

Given the following parameters

Speed = 65km/hr

Time = 3 hours (from noon to 3PM)

Get the distance covered by Isaiah;

Distance = 65 * 3

Distance = 195km > 186km

To learn more about Speed from the given link:

https://brainly.com/question/13943409

#SPJ4

Answer:

volume

Explanation:

the mass is the same on earth as it is on the surface of the moon. The weight is determined by the force of gravity. The density is the thickness. But the volume is not a factor.

Answer:

Ionization energy is the energy required to remove an electron from a specific atom. It is measured in kJ/mol, which is an energy unit, much like calories. The ionization energies associated with some elements are described in the Table 1. For any given atom, the outermost valence electrons will have lower ionization energies than the inner-shell kernel electrons. As more electrons are added to a nucleus, the outer electrons become shielded from the nucleus by the inner shell electrons. This is called electron shielding .

Explanation:

a little summary

Ionization energy refers to the amount of energy needed to remove an electron from an atom.

Ionization energy decreases as we go down a group.

Ionization energy increases from left to right across the periodic table.

Answer:

The theory for metallic bonding explains conductivity by stating that metals have delocalized electrons that are free to move throughout the metal lattice. When an electric field is applied to a metal, these delocalized electrons move in response to the field, creating an electric current. Since these electrons are not bound to a particular atom, they are free to move throughout the metal, which allows for the high electrical conductivity that is characteristic of metals.

The molarity of NaOH solution is 0.114 M.

Given, Mass of flask and vinegar solution= 25.17 g.Mass of flask= 15.12 gVolume of vinegar solution (in mL)= 10.00 mlInitial volume of NaOH (in mL)= 0.00 mlFinal volume of NaOH (in mL)= 39.00 mlThe Mass of vinegar solution is 10.0503 g.The volume of NaOH used in titration is 39.00 ml.Let's calculate the molarity of the NaOH solution.First, calculate the moles of NaOH used in the reaction. Moles of NaOH = Molarity × Volume of NaOH (in L) Converting volume in mL to L,Volume of NaOH used = 39.00 mL = 39.00/1000 L = 0.0390 LThe molarity of NaOH solution is given by;Molarity of NaOH = Moles of NaOH / Volume of vinegar solution (in L)Converting volume in mL to L,Volume of vinegar solution = 10.00 mL = 10.00/1000 L = 0.0100 LNow, substituting the values; Molarity of NaOH = 0.114 M.

for such more questions on molarity

https://brainly.com/question/30404105

#SPJ8

On a cold day the atmosphere temperature is reported as 12. 9F. The temperature in kelvin is 262.54 °K.

The thermal energy of a substance or system is measured by its temperature. Temperature measurements are most frequently expressed in Celsius (°C), Fahrenheit (°F), and Kelvin (°K) (K).

A straightforward formula is used to convert between degrees Fahrenheit and Kelvin: K = (y °F - 32) x 5/9 + 273.15. The two most widely used and recognized temperature scales are in degrees Fahrenheit and degrees Kelvin.

°K= (Temperature- 32) x 5/9 + 273.15

°K= (12.9°F − 32) × 5/9 + 273.15 = 262.54 °K.

Therefore, the reported temperature of the atmosphere on a cold day is 12. 9F.The temperature in kelvin is 262.54 °K.

Learn more about temperature at https://brainly.com/question/30392345

#SPJ4