What is the geometry name for PF5? Is PF5 polar or non-polar?

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]

Answer is: step 3 would be placed C.

This is example of chemical change (chemical reaction), because new substances are formed (gas is emitted), the atoms are rearranged.

Physical property can be observed and measured without any changes in molecular composition. The same substance is present before and after the psysical change, just with different form or state of matter.

Chemical reaction: powder + water → new substance + gas.

Answer:

The correct answer is C

Explanation:

Hey there!

"Which process responsible for the growth a repair of human tissue?"

Well, it heals itself which is called the mitosis but none of those are your answer choices .. the one that seems to be closer to those two results would be: Option 3. [tex]\boxed{cell-division}[/tex]

Therefore, your answer would most likely be: [tex]\boxed{cell-division}[/tex]

Good luck on your assignment and enjoy your day!

~[tex]LoveYourselfFirst:)[/tex]

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.

This problem can be solved by Dalton's law of  partial pressures which states that  in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

Ptotal = P₁ + P₂ + P₃ + ..... + Pn

Herein, Ptotal = P(Ne) + P(Ar) + P(He)

Ptotal = 1.25 atm, P(Ne) = 0.68 atm and P(Ar) = 0.35

So, P(He) = Ptotal - P(Ne) - P(Ar) = 1.25 - 0.68 - 0.35 = 0.22 atm

Answer:

0.22 atm

Explanation:

took test

Answer is: the nucleus of a helium atom.

Alpha particle is nucleus of a helium-4 atom, which is made of two protons and two neutrons.

For example, nuclear reaction:

²³⁴U → ²³⁰X + α (alpha particle).

Alpha decay is radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and transforms into an atom with an atomic number that is reduced by two and mass number that is reduced by four.

a helium nucleus emitted by some radioactive substances, originally regarded as a ray.

The very last option is the correct answer.

Answer: Option (4)

Explanation: For the formation of a tornado, warm air must meet the cold air.

Initially, the warm air present in the lower atmosphere, gets heated up, being less dense, rises up and mixes up with the cold and denser air mass present in the upper atmosphere. Due to this collision of both the air masses, and the presence of water vapor, it gets converted into water droplets and formation of clouds. With time a more intense funnel forms due to the wind from all direction and forms a tornado.

Thus, the correct answer is option (4).

A rock's exposure to the weathering elements and its surface area can affect its rate of weathering. Rocks that are constantly bombarded by running water, wind, and other erosion agents, will weather more quickly. Rocks that have a large surface area exposed to these agents will also weather more quickly.

Answer:

The surface area of a rock and the rate of weathering is directly related to one another. When a rock of large surface area is exposed to the atmosphere, then the factors such as rainfall, temperature, wind will affect the rock by weathering and erosion, depending upon the latitude of the area.

In the high latitudinal areas, these fractures in the rocks can trap the water during rainfall, and this water at night freezes as a result of which the volume of water increases by about 9%. Due to this the volume expands and exerts a force that ultimately leads to the weathering of rocks. The surface area when exposed more including these fractures

Due to the frequent changing of the temperature in some regions, the rocks undergo the expansion and contraction process. As a result of which the rock fractures and weathers.

In the tropical region, because of the maximum amount of sunlight and rainfall, the rocks are more prone to weathering. The agents namely wind, water will directly flow over the surface of the rock, thereby breaking down the rock particles. So the rate of weathering (both physical and chemical) is higher when the rock surfaces are highly exposed.

Solid! The molecules in solid matter are arranged closely together and packed quite tightly to maintain a regular shape. Hope this helps!

Answer: Option (c) is the correct answer.

Explanation:

It is known that in a solid, molecules are held together by strong intermolecular forces of attraction. As a result, they are unable to move from their initial place but they can vibrate at their mean position.  

Hence, in solid substances the molecules have low kinetic energy.

On the other hand in liquids, the molecules are held by less strong intermolecular forces of attraction as compared to solids. Due to which they are able to slide past each other. Hence, they have medium kinetic energy.

Whereas in gases, the molecules are held by weak Vander waal forces. Hence, they have high kinetic energy due to which they move rapidly from one place to another leading to more number of collisions.

Hence, gases are able to expand more rapidly as compared to liquids.

Thus, we can conclude that out of the given options solid is a matter phase in which the molecules are arranged on a matrix and close together.

Answer: (2) Black bears have 74 chromosomes and 37 haploid chromosomes. (3) The bears become s3xually mature anywhere from 3-7 years. (4) There are two types of reproductive barriers: Prezygotic and Postzygotic.

Explanation:

37 chromosomes are in the black bears sex cells bears,Sex cells only contain half the number of chromosomes found in the body cells.

The body cell of an American black bear contains 74 chromosomes, then each sex cell contains 37 chromosomes.

To learn more about chromosomes refer:https://brainly.com/question/11912112

#SPJ2

A) The chemical equilibrium will shift to the right, favoring the forward reaction.

The forward reaction absorbs heat. It is endothermic. Going in that direction will remove heat from the system. The temperature of the system will drop.

The reverse reaction produces heat. It is exothermic. Converting products back to reactants will adds to the heat of the system. The temperature of the system will increase.

By the Le Chatelier's Principle, a system in equilibrium will respond to changes in a way that minimizes their effect.

In this question, the change is an increase in temperature. The system will seek to reduce its temperature. It will favor the forward reaction, which is endothermic and removes heat from the system.

Temperature of the system will decrease. There will be more products and less reactants. The equilibrium will shifts to the left.

The chemical equilibrium will shift to the right, favouring the forward reaction. Hence, option A is correct.

Chemical equilibrium is the condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

The forward reaction absorbs heat. It is endothermic. Going in that direction will remove heat from the system. The temperature of the system will drop.

The reverse reaction produces heat. It is exothermic. Converting products back to reactants will add to the heat of the system. The temperature of the system will increase.

By Principle, a system in equilibrium will respond to changes in a way that minimizes their effect.

In this question, the change is an increase in temperature. The system will seek to reduce its temperature. It will favour the forward reaction, which is endothermic and removes heat from the system.

The temperature of the system will decrease. There will be more products and fewer reactants. The equilibrium will shift to the left.

Hence, option A is correct.

Learn more about chemical equilibrium here:

https://brainly.com/question/4289021

#SPJ2

Using the periodic table, the element Rb, Rubidium is a member of the Alkali metal (Group IA) of the periodic table.

The periodic table is a systematic arrangement of elements in order of their atomic number into a set of 8 primary Columns each of which is called a Group and a set of 7 rows each of which is called a Period.

Ultimately, Rb, Rubidium is a member of the Alkali metal (Group IA) of the periodic table.

Other notable group include:

Read more:

https://brainly.com/question/18629769

Final answer:

Plate tectonics and the uplift of mountains due to the movement of Earth's tectonic plates explain the presence of marine fossils found on mountains far from any ocean or sea.

Explanation:

Fossils of marine animals found on mountains far from any ocean or sea can be explained by the concept of plate tectonics. Plate tectonics is the theory that the Earth's outer shell is divided into several plates that move and interact with each other.

Over millions of years, the movement of these plates can cause mountains to form and previously submerged areas to be uplifted. Fossils of marine animals found on mountains suggest that these areas were once underwater and have since been uplifted due to plate tectonic forces.

For example, the presence of marine fossils on the Himalayan mountains is evidence that the Indian subcontinent was once located in the ocean and collided with the Eurasian plate, causing the formation of the Himalayan mountain range. The uplift of the mountains exposed the fossils that were once buried deep in the ocean floor.

In summary, the best explanation for marine fossils found on mountains far from any ocean or sea is plate tectonics and the movement of Earth's tectonic plates.

b222222222222222222222222222222222222222222222

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.

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.

https://brainly.com/question/37463647

#SPJ3

Hardness is the property being measured.

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.

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.

https://brainly.com/question/9391940

#SPJ3

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.

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.

Answer:

C. The same amount of work is done on each box.  

Step-by-step explanation:

The formula for work (w) done is

w = f×d

Box A:

w = 3 × 2

w = 6 J

=====

Box B:

w = 2 × 3

w = 6 J

The same amount of work is done on each box

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.  

It is a pure substance

The reaction between NaC₂H₃O₂(aq) and Pb(NO₃)₂(aq) does occur, but the products formed are soluble and therefore do not precipitate out. The equation for this reaction is:.

[tex]NaC2H3O2(aq) + Pb(NO3)2(aq) → Pb(C2H3O2)2(aq) + 2NaNO3(aq)[/tex]

The reaction is a double displacement reaction, where the two reactants exchange ions to form new products. In this case, the lead ion (Pb²+) from Pb(NO₃)₂(aq) replaces the sodium ion (Na+) in NaC₂H₃O₂(aq) to form

[tex]Pb(C2H3O2)2(aq) and NaNO3(aq).Pb(NO3)2(aq) + 2NaC2H3O2(aq) → Pb(C2H3O2)2(aq) + 2NaNO3(aq)[/tex]

Since both products, Pb(C₂H₃O₂)₂(aq) and NaNO₃(aq), are soluble in water, they remain in solution and do not form a solid precipitate. Therefore, it may appear that no reaction has occurred.

Know more about reaction:

https://brainly.com/question/30464598

#SPJ2

he can lift 440.925 pounds

Macho Mel can lift approximately 440.924 pounds, as 200 kilograms is equal to 440.924 pounds when using the conversion factor of 1 kilogram being approximately 2.20462 pounds.

To convert kilograms to pounds, one must use the conversion factor where 1 kilogram equals approximately 2.20462 pounds. So, by multiplying 200 kilograms by this conversion factor, we find that Macho Mel can lift:

200 kg x 2.20462 lbs/kg = 440.924 lbs

Therefore, Macho Mel can lift 440.924 pounds with ease.

Answer: The correct answer is Option A.

Explanation:

From the given options:

A. Ionic bonds: These bonds are formed when there is complete transfer of electrons from one atom to another atom. An atom which looses electrons is known as electropositive atom and the atoms which gains electrons is known as electronegative atom.

B. Covalent Bonds: These bonds are formed when there is sharing of electrons between the two atoms.

C. Metallic bonds: These bonds are formed from the attraction between the free electrons and fixed positively charged of two metallic atoms.

D. Polyatomic Bonds: These bonds are formed between the species forming a polyatomic ion.

From the given information, the correct answer to this question is Option A.

Answer:

The correct answer here is ionic bond

Explanation:

Answer: 120

Explanation:

Volume of the gas is defined as the space occupied by a substance. It is expressed in units like [tex]cm^3[/tex], [tex]m^3[/tex] , L and ml.

All these units of volume are inter convertible.

We are given:

Volume of the gas = [tex]120ml[/tex]

Converting this unit of volume into [tex]cm^3[/tex] by using conversion factor:

[tex]1cm^3=1ml[/tex]

[tex]120ml=\frac{1}{1}\times 120=120cm^3[/tex]

Thus the volume in [tex]cm^3[/tex] would be 120.