pls help me with this

We can quote many examples for such things which are helpful or harmful depending on point of view or situation or amount etc.

a) Bacteria : they can be helpful for fermentation process used in manufacturing of many useful things (like beverages) and can be harmful as they cause rotting of many useful things

b) Beaver : it is one of the largest rodent on earth. It is harmful as it causes cutting of trees. It lives upon them.

However, it a natural dam builder. It has a tremendous power to swim or float in water.

It can create canals naturally.

But for living purpose it feeds upon trees and cause destruction of trees and thus forest.

The substances and their chemical formulas are: water (H2O), hydrogen ion (H+), hydronium ion (H3O), and hydroxide ion (OH-)

1. H+ matches with the chemical formula H2O, which represents water.

2. H2O matches with the chemical formula H2O, which represents water.

3. H3O matches with the chemical formula H3O, which represents the hydronium ion.

4. OH- matches with the chemical formula OH-, which represents the hydroxide ion.

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Answer:

Seeing The 50 N upwards and Ur mom meaning:

Explanation:

Ur Mom banged the 50 N

43 degrees

angle of reflection is equal to the angle of incidence

Answer:

An acid would have to contain H+ ions  

Hydronium ions are commonly known as H3O+

A strong base will have a pH of 12-14.

Ions are known as charged particles.

Bases contain OH^- ions.

Colored Litmus paper is an indicator.

The correct amount of HNO₃ needed to dissolve 11.45 g of Cu according to the equation is 98.9 grams.

To solve this problem, first, determine the molar mass of copper (Cu) and nitric acid (HNO₃). Copper has a molar mass of 63.55 g/mol, while nitric acid has a molar mass of 63.01 g/mol.

Next, calculate the number of moles of copper present in 11.45 g using its molar mass. This yields approximately 0.180 moles of Cu.

Now, use the stoichiometry of the balanced chemical equation to find the moles of nitric acid needed.

According to the equation, 3 moles of Cu react with 8 moles of HNO₃. Therefore, the moles of HNO₃ needed would be (8/3) × 0.180 = 0.480 moles.

Finally, convert moles of HNO₃ to grams using its molar mass. This gives 0.480 moles × 63.01 g/mol = 30.245 g.

However, this is the amount needed for 0.180 moles of Cu.

To find the amount needed for 11.45 g of Cu, we use the proportion: (30.245 g / 0.180 mol) × 11.45 g = 192.08 g.

The correct answer is 98.9 grams of HNO₃.

To dissolve 11.45 g of Cu, 31.92 grams of HNO₃ are needed.

Molar Mass Calculation:

Molar mass of Cu = 63.55 g/mol

Molar mass of HNO₃ = 63.01 g/mol

Moles of Copper:

[tex]\[ \text{Moles of Cu} = \dfrac{\text{Mass of Cu}}{\text{Molar mass of Cu}} = \dfrac{11.45 \, \text{g}}{63.55 \, \text{g/mol}} = 0.18 \, \text{mol} \][/tex]

Stoichiometry of the Reaction:

According to the balanced equation:

3 moles of Cu react with 8 moles of HNO₃.

Moles of HNO₃:

[tex]= \dfrac{8}{3} \times \text{Moles of Cu} \\= \dfrac{8}{3} \times 0.18 \, \text{mol} = 0.48 \, \text{mol} \][/tex]

Mass of HNO₃:

[tex]\[ \text{Mass of } HNO_3 = \text{Moles of } HNO_3 \times \text{Molar mass of }HNO_3\\ = 0.48 \, \text{mol} \times 63.01 \, \text{g/mol} \\= 31.92 \, \text{g} \][/tex]

Explain that argon has 18 protons and 18 electrons. There are 2 electrons on the first energy level, 8 electrons on the second level, and 8 electrons on the third energy level. Good luck!

Answer:

The sublayer that is likely to be filled after the rest of the subshells at a specific energy level will be the "s" layer.

Explanation:

The sublayer that is likely to be filled after the rest of the subcases at a specific energy level will be the "s" layer. This is explained by the Pauling diagram.

Linus Pauling Diagram or Electronic Distribution Diagram is a model that assists in the configuration of the electrons of atoms and ions through energy sublevels. This diagram is based on the energy sublevels of the atom to organize the electrons. These are arranged from lowest to highest energy when the atom is in its ground state. The electrosphere of atoms is formed by 7 (seven) electronic layers, represented by the letters: K, L, M, N, O, P and Q. Each layer allows a maximum number of electrons and each layer has a number of sublevels.

The K layer has only one sublevel (s), which allows up to 2 electrons. This sublayer will likely fill after the rest of the subshells at a specific energy level.

1.atoms

2.two

3. Elements are combined to make compounds

4.fewer

5. Larger  

6. Starch is made up of three Elements.

I’m not sure about the other two but I hope this helped!!

I believe your answer might be

D) About 550 million more people speak Mandarin than speak Hindi.

Answer: The correct option is d.

Explanation: Antoine Lavoisier is a french scientist who discovered the role of oxygen in the process of combustion and respiration.

He was famous for the law of conservation of mass.

This law states that the total mass the reactant will equal to the total mass of the products in a chemical reaction.

For example: Combustion of methane

[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]

Mass of the reactants = [tex][12+4(1)]+[2(32)]=80g/mol[/tex]

Mass of the products = [tex][12+2(16)]+2[2(1)+16]=80g/mol[/tex]

Hence, every chemical reaction will follow law of conservation of mass.

Antoine Lavoisier established the Law of Conservation of Mass, which states the total mass of reactants is equal to the total mass of the products in a chemical reaction.

Antoine Lavoisier, a French scientist, is renowned for establishing the Law of Conservation of Mass, which fundamentally states that the total mass of the reactants in a chemical reaction is always equal to the total mass of the products. This principle aligns with the option 'The total mass of the products of a reaction is equal to the total mass of the reactants' (option d). Relating to the conservation of matter, it suggests that matter can neither be created nor destroyed, but only transformed from one form to another. This discovery was groundbreaking and forms a key part of the basis of modern Chemistry.

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Calcium oxide features a giant ionic lattice with strong electrostatic forces of attraction known as ionic bonds, which involve the attraction between cations and anions.

Calcium oxide has a giant ionic lattice in which there are strong electrostatic forces of attraction in all directions. These forces arise because calcium oxide is composed of calcium ions and oxide ions, which are held together by the electrostatic attraction between oppositely charged ions. This attraction is referred to as ionic bonding, and it is a type of chemical bond that involves the electrostatic attraction between cations and anions.

In the context of ionic compounds such as calcium oxide, the lattice energy plays a critical role in stability. Lattice energy is the energy required to separate a mole of the solid ionic compound into its gaseous ionic constituents. It's a measure of the strength of the bonds that hold the ionic crystal together, reflecting the electrostatic forces between the ions. In general, a higher charge and smaller ion size result in a larger lattice energy, contributing to greater stability of the ionic crystal.

The complete question is:

Calcium oxide has a giant ionic lattice in which there are strong electrostatic_______________________ of attraction in all directions.

Hardness is the property being measured.

Answer is: electrons.

According to the Bohr model of the atom:

1. Electrons orbit the nucleus in orbits that have a set size and energy.

2. Energy levels of electrons are discrete (certain discrete values of energy).

3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.

Proton is a subatomic particle with a positive electric charge of +1e elementary charge.

Beside negatively charged electrons, atoms have positively charged protons, so atoms have neutral charge.

Final answer:

The cell membrane regulates the movement of materials in and out of the cell through selective permeability and transport proteins.

Explanation:

The cell membrane is responsible for regulating the movement of materials in and out of the cell. It is selectively permeable, allowing some substances to pass through while blocking others. This selective permeability helps to maintain the internal environment of the cell and ensures the cell's survival.

Transport proteins in the cell membrane act as channels or pumps to facilitate the movement of specific molecules in and out of the cell. These proteins play a crucial role in maintaining the balance of salts, nutrients, and proteins within the cell.

An example of a transport protein is ion channels. Ion channels regulate the movement of ions such as sodium, potassium, calcium, and chloride across the cell membrane. These ions are essential for various cellular processes and maintaining membrane potential.

The correct answer is pahoehoe.  

The constituents generated in the volcanic eruptions are known as pyroclastic material. Of the given options pahoehoe is not considered as a pyroclastic material. It is a kind of lava flow of basaltic rock, generally dark-colored with a ropey or smooth surface. It is one of the two prime forms of lava flow discharged from volcanoes of the Hawaiian kind, the other is aa.  

Pahoehoe lava is a usual kind of basaltic lava, which cools down producing billowy, smooth, or ropy surfaces. Generally, it is produced by various small breakouts of lava from an over-crusted irregular, inflating flat flow.  

Pahoehoe, a type of basaltic lava with a smooth or ropy surface, is not considered a pyroclastic material. Pyroclastic materials are solid substances produced by volcanic eruptions which include ash, lapilli, and cinders.

Pyroclastic material, associated with volcanic eruptions, includes a variety of solid substances. These range from ash, which is the finest material, to lapilli, and cinders, larger and heavier particles. On the contrary, pahoehoe is not included in the category of pyroclastic materials. Instead, pahoehoe is a type of basaltic lava that has a smooth, billowy, or ropy surface. Therefore, pahoehoe is the option that is not considered a pyroclastic material from the choices given.

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The movement of charged particles cannot pass through an electrolyte to produce an electric current.

True

False

FALSE

Final answer:

The statement is false. option B

Explanation:

The statement that the movement of charged particles cannot pass through an electrolyte to produce an electric current is false. In fact, electrolytes are substances that can conduct an electric current when dissolved in water or when melted.

Electrolytes contain free ions that move in response to an electric field, which allows them to conduct electricity. For example, when table salt (sodium chloride) is dissolved in water or melted, it becomes an electrolytic solution with ions that readily move, completing an electrical circuit and allowing the current to flow.

Insulators, such as glass, are materials that do not allow charges to move through them effectively. In substances like solid sodium chloride or pure water, the ions are not free to move, making them poor conductors or insulators. However, when these substances are in the form of an electrolyte, the ions are free and mobile, and thus conductivity is observed.

Knowing the mass and radius of the Earth and the distance of the Earth from the sun, we can calculate the mass of the sun (right), again by using the law of universal gravitation. The gravitational attraction between the Earth and the sun is G times the sun's mass times the Earth's mass, divided by the distance between the Earth and the sun squared. This attraction must be equal to the centripetal force needed to keep the earth in its (almost circular) orbit around the sun. The centripetal force is the Earth's mass times the square of its speed divided by its distance from the sun. By astronomically determining the distance to the sun, we can calculate the earth's speed around the sun and hence the sun's mass.

Astronomers determine the gravitational force between celestial objects by observing their motion and applying Kepler's law together with the Doppler effect. This allows the calculation of the masses involved and hence gravitational forces. These methods work for celestial bodies near or far.

Astronomers determine the gravitational force between two celestial objects indirectly by using observations and mathematical laws. For example, by observing the orbits of stars close to the galactic center and using Kepler's third law, we can estimate the mass of a black hole in a far-off galaxy. Similarly, by measuring the orbital speed of gas in the rotating accretion disk of distant galaxies, we can calculate the gravitational force exerted by the central object.

The Doppler effect is another important tool in this process, which is used to measure radial velocities of the orbiting material and thus derive the speed at which it moves around. This speed tells us about the central body's gravitational force. Gravitational effects between two bodies also allow the calculation of masses of astronomical objects.

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Compounds that are gases at room temperature are covalent bonds (nonmetal + nonmetal).

Final answer:

The state of a substance at room temperature is determined by the strength of intermolecular forces and molecular interactions. Carbon dioxide is a gas at room temperature because of weak intermolecular forces, whereas solids like metals have strong intermolecular forces that give them a definite volume and shape. Compounds exhibit different states under various temperature and pressure conditions.

Explanation:

The physical state of a compound like carbon dioxide at room temperature can be explained by its molecular structure and the interactions between its molecules. Carbon dioxide is a gas at room temperature because the forces between its molecules are relatively weak, allowing them to move freely and occupy the entire volume available to them.

On the other hand, solids at room temperature, such as metals, have strong intermolecular forces that keep their atoms or molecules close together in a fixed, orderly pattern, giving them a definite volume and shape. For a compound to be a liquid at room temperature, its boiling point must be higher than the room temperature, indicating stronger intermolecular forces than gases, but not as strong as solids, thus allowing the molecules to flow while remaining close together.

The state of compounds at room temperature is a significant physical property and is determined by molecular interactions and environmental conditions such as temperature and pressure. All substances can exist in solid, liquid, or gas states under different conditions. For example, carbon dioxide becomes dry ice when cooled to about -78°C, showcasing how temperature changes can alter the state of a substance.

3.56 times 10^8 i believe is your answer

3.56 × 10^8

1. Move the decimal to the left until it gets to a number below ten

2. Then count the number of times you moved it over

3. Multiply the first number you got (3.56) by 10 to the power of how ever many times you moved the deecjaml over.

It will look like this: 3.56 × 10^8

Gastrointestinal Tract. Radiation damage to the intestinal tract lining will cause nausea, bloody vomiting and diarrhea. This is occurs when the victim's exposure is 200 rems or more. The radiation will begin to destroy the cells in the body that divide rapidly.

The balanced equation is

4Fe(s) +  3O2(g)  ---> 2Fe2O3(s)

here four moles of Fe will react with O2 to give 2 moles of Fe2O3

mass of Fe reacted = 33.4 grams

moles of Fe reacted = mass of Fe / atomic mass of Fe

moles of Fe reacted = 33.4 / 55.8 = 0.599 moles

moles of Fe2O3 formed = 0.5 X 0.599 = 0.2995 moles

so mass of Fe2O3 formed = moles X molar mass = 0.2995 X 159.69 = 47.83 g

To determine the amount of iron(III) oxide produced, we used stoichiometry to relate the given mass of iron to the mass of  Fe₂O₃ produced via the balanced equation, resulting in the formation of 47.76 grams of  Fe₂O₃.

The student asked how many grams of Fe₂O₃  are formed when 33.4 g of Fe reacts completely with oxygen. We'll solve this by using stoichiometry based on the balanced chemical equation for the reaction between iron and oxygen:

4 Fe + 3 O₂ arr 2 Fe₂O₃

Firstly, we need to find the number of moles of iron:

Number of moles of Fe = mass of Fe / molar mass of Fe = 33.4 g / 55.85 g/mol

Calculate moles of Fe₂O₃  using the mole ratio from the balanced equation. As per the equation, 4 moles of Fe produce 2 moles ofFe₂O₃ . Therefore, the number of moles of iron will be halved to find the moles of  Fe₂O₃.

Finally, convert the number of moles of Fe₂O₃  to grams using its molar mass (55.85 g/mol for Fe and 16.00 g/mol for O, resulting in 159.7 g/mol for Fe₂O₃ ).

Using the above steps, the specific calculations are:

33.4 g Fe / 55.85 g/mol Fe = 0.598 moles Fe

0.598 moles Fe arr 0.598 / 2 = 0.299 moles

0.299 moles Fe₂O₃  × 159.7 g/mol Fe₂O₃ = 47.76 g  (rounded to two decimal places)

This means that 47.76 grams of Fe₂O₃ are formed when 33.4 grams of Fe reacts with oxygen.

Answer:

the answer is transition metals

Explanation:

Answer: the correct answer is

Explanation:

Electrons are the negatively charged particles present inside the atom revolving around the nucleus. These are the subatomic particles of an atom but along with this they also exhibit wave nature explained by french scientist De Broglie.

Photon is discrete packet of energy of an electromagnetic radiation.They exhibit both properties of wave and particle. Photons exhibit's particle nature in photoelectric effect and wave nature in interference experiments.

Hence, the correct answer is option (B).

Answer:

t should include correct results and not include the falsified results

Explanation:

Answer is: the attraction between the solute and solvent is about as strong as the attraction between the solvent particles.

For example, dissociation of potassium iodide in water:  

KI(aq) → K⁺(aq) + I⁻(aq).

Solvation is the interaction of solvent (water) with molecules or ions (in this example K⁺ and I⁻) in a solute.  

Anion I⁻ has negative charge, so positive end (hydrogen atoms) of a water molecul attracts them.

Solvent (usually a liquid, but can also be a solid or a gas) is a substance that dissolves a solute.  

The names of the polyatomic ions match to their symbols as follows: Ammonium - NH₄⁺; Nitrate - NO₃¯; Phosphate - PO₄³¯; Hydroxide - OH¯. Polyatomic ions, which are ions comprising more than one atom, act as individual units in chemical reactions, and they must ensure electrical neutrality in the compounds they form.

In the question, you are required to match the names of different polyatomic ions with their correct symbols. The correct matching for this question is:

Ammonium - NH₄⁺

Nitrate - NO₃¯

Phosphate - PO₄³¯

Hydroxide - OH¯

Polyatomic ions are ions that consist of more than one atom, for instance, nitrate. They behave as a unit in a chemical reaction and have an overall charge.

They are quite common in chemistry and play significant roles in various chemical reactions. In simple ionic compound, electric neutrality is crucial, as seen in the example of calcium phosphate, Ca₃(PO₄)₂.

You determine the neutral charge by treating polyatomic ions as individual units. For instance, in calcium phosphate, the mineral in our bones, we have three calcium ions (Ca²⁺) for each two phosphate (PO₄³¯) groups.

As discreet units, the PO₄³¯ ion has one phosphorus atom and four oxygen atoms with a total charge of 3⁻. The compound is electrically neutral due to the total count of the atoms.

For more such questions on polyatomic ions, click on:

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Answer is: much energy can be gained by breaking the  bonds between atoms in the fats.

Fat, carbohydrate and protein are the three main macronutrients.

Fat molecules contain chemical energy and they are composed of triglycerides.

Fat is the most energy dense, the most efficient form of energy storage and  do not bind water thus do not increase animal body mass.

For example. fat burning in human organism release energy that we use for walking, learning, etc.

Final answer:

To determine the limiting reactant, compare the number of moles of each reactant to the stoichiometric ratio in the balanced chemical equation. The reactant with fewer moles is the limiting reactant. Without specific chemical equations or information about the reactants, it is not possible to determine the limiting reactants in the given problem.

Explanation:

The limiting reactant in a chemical reaction is the reactant that is completely consumed, thus limiting the amount of product that can be formed. To determine the limiting reactant, you need to compare the number of moles of each reactant to the stoichiometric ratio in the balanced chemical equation. The reactant with the smaller number of moles is the limiting reactant, and the one with the larger number of moles is in excess.

In the given problem, it is necessary to determine the limiting reactants for the reactions involving black powder. Without specific chemical equations or information about the reactants, it is not possible to accurately determine the limiting reactants and calculate the maximum yield of oxygen, carbon dioxide, and sulfur dioxide.