13) State four factors that can disrupt the
balance of the ecosystem-

​

Answer:

Seasonal Winds: Blow in opposite direction of normal winds  and cause droughts in winter.

Prevailing Winds: Blow mainly in one direction and move huge air masses.

Mountain Ranges: force coastal air masses to rise, cool, and  form rain clouds.

Explanation:

Hope this helps you, sorry for responding so late... have an amazing night, day, or evening

The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.

The term precipitation implies the falling of rain due to condensation of water vapor in the cloud.  We must note that several factors affect precipitation in a given area.

The following phrases below are matched with how it affects precipitation;

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Answer:

d)Gas syringe and stopclock

Explanation:

Gas syringe is used to measure the volume of gas collected

Stopclock is used to measure the time taken to produce a certain amount of gas thus the rate of reaction:volume vs time can be determined

Answer:

please don't trust those scam links

Answer:

air, water, sunlight

Explanation:

A limiting factor may be defined as a environmental condition or a resource that can limit the plant growth as well as distribution or the abundance of an organism or its population within the ecosystem. The ability  of any plant species to grow and spread throughout any geographic area is the direct result of the adaption to its biotic  and abiotic components of that region.

Some of the factor that affect the plant growth are : sunlight, air, proper temperature, moisture, nutrients, wind,etc.

The lack of the any one of the above essential component will determine the health of the  plant.

Answer:

Yes, it does, it helps very much :))

Explanation:

The chemical reaction that the situation demonstrates would be a double replacement reaction.

In double replacement reactions, the two reactants participating in the reaction are similarly built in terms of their chemical bonds and they exchange ions to form the products of the reaction. Two products are also formed from the two reactants.

It is as opposed to single replacement reactions in which the two reactants are not similar bond-wise. One of the reactants replaces or displaces one of the ions in another reactant.

In this case, the situation can be represented as follows:

Amanda-Janice + Deja-Eden ----> Amanda-Eden + Deja-Janice

Thus, it is a form of double replacement reaction.

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Answer:

A

Explanation:

The atomic mass listed in the periodic table is the weighted average of all the isotopes of that element.

The atomic mass listed in the periodic table is determined by the weighted average of all the isotopes of that element. Isotopes are the variants of the same element that vary in the number of neutrons present in the nucleus. They have the same atomic number but different atomic masses due to varying number of neutrons.

Each isotope occurs naturally in a particular proportion, and the atomic mass takes this into account. The atomic mass listed in the periodic table is not a whole number but a decimal number. For example, carbon has three isotopes, with mass numbers of 12, 13, and 14. The atomic mass of carbon in the periodic table is 12.011, which is the weighted average of the isotopic masses of carbon.

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The balanced equation for photosynthesis is as follows:6CO2 + 6H2O → C6H12O6 + 6O2. Therefore, we need 0.48 mol of carbon dioxide to produce 0.080 mol of glucose.

According to the above equation, 1 mol of glucose requires 6 mol of carbon dioxide (CO2) to undergo photosynthesis. This means that for 0.080 mol of glucose, we will need six times the number of moles of CO2.0.080 mol glucose × 6 mol CO2/1 mol glucose = 0.48 mol CO2Therefore, we need 0.48 mol of carbon dioxide to produce 0.080 mol of glucose.

Green plants use light from the sun to drive photosynthesis, a process in which carbon dioxide gas and liquid water form aqueous glucose C6H12O6 and oxygen gas (O2). Photosynthesis is the process by which carbon dioxide and water are converted into organic molecules, such as glucose, by the addition of light energy (photosynthesis). The process begins with light being captured by pigments in the plant's photosynthetic tissues, which are then transferred to photosystems, where they are used to power the production of ATP (adenosine triphosphate) and NADPH (nicotinamide adenine dinucleotide phosphate). Glucose synthesis requires the help of these two molecules, which supply the necessary energy and reduce power, respectively.

We can say that 0.48 mol of carbon dioxide is required to produce 0.080 mol of glucose. Photosynthesis is the process by which carbon dioxide and water are converted into organic molecules, such as glucose, by the addition of light energy. The process requires the help of ATP and NADPH, which supply the necessary energy and reduce power, respectively.

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Answer:

20 mL

Explanation:

The student should record 20 mL as the correct volume.

The curved surface of a liquid that is usually observed in a buret is referred to as the meniscus. This meniscus is created as a result of the surface tension of the liquid against the walls of the buret. Hence, in order to avoid errors due to parallax, the bottom of the meniscus should be read and not the top.

Therefore, the correct volume that the student should record is 20 mL.

The kinetic molecular theory of matter explains the physical properties of matter and how they relate to their molecular structures. This theory states that matter is made up of tiny particles, called molecules, that are always in constant motion, even when in a solid state.

The kinetic molecular theory of matter helps in explaining the properties of matter and how it relates to the molecular structures of matter. According to this theory, the particles that make up matter are in constant motion regardless of their state of matter, and their motion is related to the state of matter they exist in. The theory is divided into three main postulates as follows:1. Matter is made up of tiny particles called molecules that are in constant motion, even when in a solid state.2. The movement of these particles increases with an increase in temperature, resulting in an increase in the kinetic energy of the particles.3.

The collisions between these particles and the walls of the container they are in result in the pressure exerted by the gas. The relationship between heat, energy, and temperature as part of the kinetic molecular theory is as follows:Heat is the transfer of energy between different systems, whereas temperature is the measure of the average kinetic energy of the particles in a system. This means that as heat is transferred into a system, the particles in that system will gain kinetic energy, which will lead to an increase in temperature.

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Answer:

Molarity of the solution = 3.000 M

Volume of the solution = 250.0 mL = 0.25 L

moles in 250.0 mL = molarity x volume of the solution

                             = 3.000 M x 0.25 L

                             = 0.75 mol

Hence, 0.75 mol of NaCl is needed to prepare 250.0 mL of 3.000 M NaCl solution.

Moles (mol) = mass (g) / molar mass (g/mol)

Moles of NaCl in 250.0 mL = 0.75 mol

Molar mass of NaCl           = 58.44 g/mol

Mass of NaCl in 250.0 mL = Moles x Molar mass

                                         = 0.75 mol x 58.44 g/mol

                                         = 43.83 g

Hence, 43.83 g of NaCl is needed to prepare 250.0 mL of 3.000 M solution.

Explanation:

Therefore, the mole fraction of methanol is 0.941. To calculate the mole fraction of methanol, you need to know the number of moles of methanol and glycerine present in the solution.

First, we need to calculate the number of moles of methanol in the solution. To do this, we use the molar mass of methanol (32.04 g/mol)

130g / 32.04g/mol = 4.05 moles

We also need to calculate the number of moles of glycerine in the solution. To do this, we use the molar mass of glycerine (92.09 g/mol)

23.5g / 92.09g/mol = 0.2555 moles

The mole fraction of a component is calculated by the number of moles of that component divided by the total number of moles in the solution.

Mole fraction of methanol = moles methanol / (moles methanol + moles glycerine)

= 4.05 moles / (4.05 moles + 0.2555 moles)

= 0.941

Therefore, the mole fraction of methanol is 0.941.

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The percent yield of the solution is obtained as  94%.

We know that the reaction equation for the problem that we have here can be written as;

Pb(NO3)2(aq) + 2KI(aq) → 2KNO3(aq) + Pbl₂(s)

Number of moles of Pb(NO3)2 = 10.5 g /331 g/mol

= 0.0317 moles

Number of moles of KI =  5.38 g/166 g/mol

= 0.0324 moles

If 1 mole of Pb(NO3)2 reacts with 2 moles of KI

0.0317 moles of Pb(NO3)2 reacts with 0.0317 * 2/1

= 0.0634

Thus KI is the limiting reactant.

Then;

2 moles of KI produces 1 mole of PbI2

0.0324 moles of KI will produce  0.0324 moles * 1 mole/2 moles

= 0.0162 moles of PbI2

Mass of PbI2 produced is;

0.0162 moles  * 461 g/mol

= 7.47 g

Thus percent yield =  7.02 g / 7.47 g * 100/1

= 94%

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The solubility of a compound in water generally decreases as the chain length of the compound increases.

The solubility of a compound in water depends on several factors, including the intermolecular forces between the compound and water molecules. In general, compounds with shorter chain lengths tend to be more soluble in water compared to compounds with longer chain lengths.

Shorter chain lengths typically result in smaller molecules with fewer hydrophobic regions. Hydrophobic regions of a molecule repel water molecules, making it less likely for the molecule to dissolve in water. However, as the chain length increases, the hydrophobic regions become larger and more pronounced, leading to reduced solubility in water.

Additionally, longer chain lengths can also increase the surface area of the molecule, which further reduces the ability of water molecules to surround and interact with the compound. As a result, compounds with longer chain lengths are often less soluble in water.

It is important to note that there are exceptions to this general trend. Certain functional groups or chemical modifications on the molecule can influence solubility. For example, the presence of polar functional groups such as hydroxyl (-OH) or amino (-NH₂) groups can enhance the solubility of compounds with longer chain lengths.

Overall, the chain length of a compound is an important factor in determining its solubility in water. While shorter chain lengths generally result in higher solubility, the presence of specific functional groups can modify this relationship.

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Measurement is a way to describe matter with numbers and units.

Measurement is a fundamental process used to describe and quantify various aspects of matter. It involves assigning numerical values to physical quantities and expressing them using appropriate units of measurement.

In scientific and everyday contexts, measurements provide a standardized and consistent way to communicate information about the properties, dimensions, quantities, and characteristics of objects, substances, or phenomena. By using measurements, we can describe the size, length, mass, volume, temperature, time, and many other attributes of matter.

The process of measurement typically involves two components: a numerical value and a unit. The numerical value represents the magnitude or quantity being measured, while the unit provides the reference or scale by which that quantity is expressed. Units help provide meaning, context, and comparability to measurements.

Hence, measurement provides a quantitative and objective way to describe matter, allowing us to understand and interact with the physical world in a systematic and meaningful manner.

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Answer:

Because after increasing of temperature kinetic energy of molecules increases and reaction speed increases in forward or reverse direction.

Explanation:

The only thing that should be in one of the five control test tubes is a

pH 4 buffer solution and hydrogen peroxide.

When an acidic or basic component is added, a buffered solution can withstand the pH change. It can keep the pH of the solution largely stable by neutralizing small amounts of added acid or base. This is crucial for procedures and/or reactions that call for narrow pH ranges that are stable.

In acid-base chemistry, a buffer is a very helpful solution. The pH can occasionally change rapidly and dramatically when solutions combine with a strong acid or base. The pH can change more gradually by neutralizing some of the additional acid or base with a buffer solution.

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Answer:

B) 1.6 g

Explanation:

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The gravity force on an object from the Earth is the same regardless of whether the object is surrounded by air .

the Earth has an average gravitational force. Different locations on Earth have gravitational forces that are larger or smaller than average. This is because each location has more or less mass than the average

The E2 reaction proceeds with anti-periplanar stereochemistry, resulting in the formation of diastereomeric alkenes for alkyl halides (a) and (b). The products will have different configurations of alkene substituents, which should be drawn as regular lines.

An E2 reaction proceeds with anti-periplanar stereochemistry, meaning the leaving group and the hydrogen being eliminated must be on opposite sides of the molecule. To draw the products of each elimination for diastereomeric alkyl halides (a) and (b), follow these steps:
Step:1. Identify the leaving group (usually a halogen) and the hydrogen that will be eliminated (usually bonded to the adjacent carbon).
Step:2. Ensure that these groups are anti-periplanar (opposite sides) in the starting molecule.
Step:3. Remove the leaving group and the hydrogen, and form a double bond between the carbon atoms that were bonded to these groups.
Step:4. Draw the resulting alkene with substituents as regular lines, not dashes or wedges, as mentioned in your question.
Since the alkyl halides in (a) and (b) are diastereomers, their products will also be diastereomeric alkenes. Diastereomers are stereoisomers that are not mirror images of each other. This means that the products of these two reactions will have different configurations of their substituents around the double bond, but will not be mirror images.

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The wavelength of an infrared photon that has a frequency of 2.13 x 10⁹

Hz is 0.14 m.

What is infrared radiation?

          c = ν λ

where

 c = speed of light ⇒ 3×10⁸ m/s

 ν = frequency ( Hz or s⁻¹ ) ⇒ 2.13 x 10⁹ Hz

 λ = wavelength ( m ) ⇒ ?

    substituting the values

    c = ν λ

   λ = c / ν

      = (3×10⁸ m/s) / 2.13  x 10⁹

      = 1.4 x 10⁻¹ m or 0.14 m

Thus we can conclude that the wavelength of an infrared photon that has a frequency of 2.13 x 10⁹Hz is  0.14 m.

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Metallic ions differ from the ions in ionic solids in their bonding and structure. Metallic ions form a metallic bond, which is a sea of delocalized electrons surrounding positively charged ions. These electrons are free to move and allow metals to conduct electricity and heat. In contrast, ionic solids consist of a lattice structure, where positively charged cations and negatively charged anions are bonded together through electrostatic forces called ionic bonds.

Metallic ions and ions in ionic solids differ in their properties and behavior due to the different nature of their bonding. Metallic ions are found in metals, which have a delocalized electron sea that allows for the formation of a metallic bond. This bond is characterized by the sharing of valence electrons among the atoms, creating a lattice of positively charged ions surrounded by a sea of electrons. In contrast, ionic solids consist of a lattice of positively and negatively charged ions held together by electrostatic forces. The ions in ionic solids are held rigidly in place and cannot move freely like the delocalized electrons in metallic bonding. This difference results in different physical and chemical properties, such as the higher electrical conductivity and malleability of metals compared to ionic solids. Overall, the nature of the bonding between the ions determines their properties and behavior.

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Answer:

Two Molecules must collide with each other

Explanation:

The chemicals shown represent molecules of compounds that are formed from the reaction between molecules and atoms of elements.

Chemical compounds are substances composed of two or more different elements that are chemically bonded together in a fixed ratio.

Chemical compounds can be classified into various categories, such as organic compounds (which contain carbon), inorganic compounds (which do not contain carbon), and biochemical compounds (which are involved in biological processes).

Examples of chemical compounds are NaCl, MgO, etc.

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Answer:

The answer is Hydropower provides...

Hydropower provides renewable energy for human use is the advantage of the production of electricity through hydropower. Therefore, option (C) is correct.

Hydropower is a renewable source of energy that is used to generate energy via hydropower relies on the water cycle. Hydroelectric power can be defined as a domestic source of energy, allowing it to produce its own energy without depending on international fuel sources.

The hydropower sector creates reservoirs that provide recreational opportunities such as swimming, fishing, and boating. Hydroelectric power is flexible and has facilities that can quickly go from zero power to maximum output.

They provide necessary backup power during major electricity outages or disruptions because hydropower plants can produce power to the grid immediately.

Hydropower is affordable and provides low-cost electricity and durability over time compared to other sources of energy. Hydropower benefits beyond electricity production by providing irrigation support, flood control, and clean drinking water.

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Answer:

22572J

Explanation:

a) The following values have been given:

Mass of water = 180.0g

Initial temperature = 10°C

Final temperature = 40°C

molar heat capacity for water = 75.3J/Kmol

To calculate the specific heat capacity of water (c), we divide the molar heat capacity by molar mass of water (18g/mol)

That is; 75.3/18

= 4.183 Jg/K

b) The enthalpy change denoted by ∆H is the value we are trying to find.

c) To find enthalpy change (∆H), we use the formula:

∆H = m × c × ∆T

Where; m= mass

c= specific heat capacity

∆T= change in temperature =

(final temp - initial temp)

∆H = m × c × ∆T

∆H = 180 × 4.18 × (40-10)

∆H = 180 × 4.18 × 30

∆H = 22572J

Answer:

C

Explanation:

electronic waves transmits energy but mechanical waves require a medium in order to transport their energy from bgg one place to another.

Answer:

it is B.) Electromagnetic waves vibrate in two directions that are

Explanation:

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The possible values of the quantum numbers are:

Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.

Magnetic quantum number m: -l to +l.

Spin quantum number, s: +1/2 or -1/2.

For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.

The magnetic quantum number m can have values ranging from -l to +l, inclusive.

The spin quantum number, s can be either +1/2 or -1/2.

So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:

Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.

Magnetic quantum number, m can range from -l to +l, inclusive.

Spin quantum number, s can be either +1/2 or -1/2.

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Answer:

A.1

Explanation:

The coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

A balanced chemical equation is an equation that has equal numbers of atoms for each element both on the reactant and product sides.

Methods to balance the chemical equation -:

The number of atoms for a given element is calculated by multiplying its coefficient with the element’s subscript in its chemical formula.

The coefficients in front of the formulas to show how many molecules of that material are used or produced.

Hence, the coefficient needed in front of NaNO₃ to balance the equation

Na₂S+ Zn(NO₃)₂---->ZnS + NaNO₃ is 2, therefore option (b) is correct.

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Answer:

Explanation:

The answer is B  heavy nucleus splits into two smaller nuclei