Models are used to observe phenomena which _____.

Answer: Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period.

Explanation:

Answer:

11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).

12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).

13.  Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.

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Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

If Commercial electrolytic cells for producing aluminum operate at 5.0 V and 100,000 A. The electrical power (in kilowatt-hour) used is 500kW.

Electric power is defined as the rate per unit time, at which the electrical energy is supplied by an electric circuit.

The SI unit of electric power is the Watt. One watt is defined as joule per unit time. Electric power is produced by electric generators and supplied by sources such as electric batteries.

Mathematically,

Power = current × voltage

The potential difference between two different point or terminal of rod or batteries is called voltage.

The rate of flow of electric charge is called current.

Given,

current = 100000 A

voltage = 5V

By substituting the values, we get

P = 5 × 100000

= 500000 W

= 500 kW.

Thus, we calculated that the electrical power (in kilowatt-hour) used is 500kW.

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The bottom of the arrow points to the location where the electron or electron pair was created, and the top of the arrow indicates where the electron or electron pair will ultimately be located therefore, the given statement is true.

Throughout the processes of bond breaking and/or bond formation, the movement (flow) of electrons is represented by curved arrows.

A. The motion of a single electron is represented by an arrow that is curved and has a single head.

B. The motion of an electron pair is represented by an arrow with two heads that is curved and curved in the middle.

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According to electronic configuration, the correct symbol for sodium with 4 neutrons, 3 protons, and 2 electrons is Na-2.

What is electronic configuration?

The distribution of electrons in atomic or molecular orbitals within an atom or molecule is referred to as its electronic configuration. It explains how every electron in an orbital move on its own.

For understanding the period table, one needs to know about electronic configuration. It aids in comprehending the chemistry of various elements.

For an element to become stable, chemical reactions must take place. The transition elements adhere to the 18-electron rule, whereas the main group elements follow the octet rule in their electrical arrangement. Noble elements are thought to be stable because their valence shells are finished in the ground state.

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Answer:

1. Heat from the pan transfers directly to the oil. 2. Heat from the pan transfers directly to the oil. 3. heated by the radiation in the microwave.

Explanation:

Answer: the mole

Explanation:

The mole is the unit of amount in Chemistry.

It provides a bridge between the atom and the macroscopic amounts of material that we work with in the laboratory.

Answer:

c. 77 %

Explanation:

Percent mass (% mass) of solute = mass of solute/mass of solution × 100

According to this question, a mountain dew solution weighing 300grams contains 231 g of sugar. This means that:

% mass of sugar = 231g/300g × 100

% mass of sugar = 0.77 × 100

% mass of sugar = 77%.

The correct answer is a) Henry's Law. This law states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas in the overlying space.

This means that as the partial pressure of the gas increases, more gas molecules will dissolve in the liquid. Henry's Law is important in many areas of science, including chemistry, environmental science, and biology.

For example, it is used to understand the behavior of gases in the atmosphere and their impact on climate change, as well as the ability of aquatic organisms to obtain oxygen from water.

Henry's Law can also be applied to industrial processes such as gas purification and carbonation of beverages.

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Answer:

option no. C is correct

an electron in the 3d

Answer:

it is C. take it to the local automotive parts store to be recycled

Explanation:

hope this helped have a nice day!

1) The reaction is exothermic and heat is a product

2) The color would turn to pink.

Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.

If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.

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Hey there!

Elements and compounds are purely homogeneous substances and they have a constant composition throughout. Elements and compounds cannot be separated into their respective constituents by physical means. Compounds and mixtures are made up of different elements or different atoms.

In alpha decay both the atomic number and mass number of the atom changes. Whereas, for beta decay only atomic number changes. The horizontal change is representing the change in atomic number and vertical change is for mass number.

Radioactive decay is the process of nuclear decay of an unstable radioactive atom by the emission of charged particles such as alpha, beta or gamma to form a stable isotope.

The nuclear decay by the emission alpha particle is called alpha decay in which the mass number decreases by 4 units and atomic number changes by 2 units. Hence the graph of alpha decay shows both vertical and horizontal change.

In beta decay beta particles are emitted where, no change occurs in mass number but atomic number increases by one. Hence, the graph will only shows the horizontal change.

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Answer:b

Explanation:

Answer:

The correct answer is The stages happens in the cytoplasm.

Explanation:

Explanation:Cellular respiration helps in the complete breakdown of carbohydrates basiclly glucose to form carbon dioxide,water and ATP molecules as energy source.Aerobic respiration consist of 3 principle steps

   The first step is called glycolysis which deals with the catabolism of  glucose into pyruvate by 10 enzymes catalyzed reactions.

      Glycolysis occurs in the cytoplasm as many of the glycolytic enzymes are present in the cytoplasm of the cell in which the glycolysis is occuring.

The description of the molecules shown is it is unsaturated alkynes. The correct option is A.

Alkynes are unsaturated double bond containing compound that react with hydrogen when a catalyst is present.

The pie bond shows that the hydrogen atoms are lost from the alkanes.

Thus, the correct option is A, unsaturated alkynes.

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The chemical safety board does not have authority to issue fines - True.

The Chemical Safety and Hazard Investigation Board (CSB) of the United States is an independent government agency charged with examining industrial chemical accidents and making recommendations to prevent future events. The CSB has the jurisdiction to issue subpoenas, hold public hearings, and make recommendations to improve chemical safety, but not to levy fines or penalties.

The CSB's primary role is investigative and advisory, and it collaborates with other regulatory agencies such as the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA), which have the jurisdiction to impose fines and enforce regulations.

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Nanomaterials, whether natural, engineered, organic, or inorganic, offer various applications across industries. However, their environmental health and safety impacts need to be carefully evaluated and managed to mitigate any potential risks.

Understanding their properties, fate, and behavior in different environments is crucial for responsible development, use, and disposal of nanomaterials.

Natural Nanomaterials:

Examples: Carbon nanotubes (CNTs) derived from natural sources like bamboo or cotton, silver nanoparticles in natural colloids, clay minerals (e.g., montmorillonite), iron oxide nanoparticles found in magnetite.

Uses: Natural nanomaterials have various applications in medicine, electronics, water treatment, energy storage, and environmental remediation.

Environmental health and safety impacts: The environmental impacts of natural nanomaterials can vary depending on their specific properties and applications. Concerns may arise regarding their potential toxicity, persistence in the environment, and possible accumulation in organisms. Proper disposal and regulation of their use are essential to minimize any adverse effects.

Engineered Nanomaterials:

Examples: Gold nanoparticles, quantum dots, titanium dioxide nanoparticles, carbon nanomaterials (e.g., graphene), silica nanoparticles.

Uses: Engineered nanomaterials have widespread applications in electronics, cosmetics, catalysis, energy storage, drug delivery systems, and sensors.

Environmental health and safety impacts: Engineered nanomaterials may pose potential risks to human health and the environment. Their small size and unique properties can lead to increased toxicity, bioaccumulation, and potential ecological disruptions. Safe handling, proper waste management, and risk assessment are necessary to mitigate any adverse effects.

Organic Nanomaterials:

Examples: Nanocellulose, dendrimers, liposomes, organic nanoparticles (e.g., polymeric nanoparticles), nanotubes made of organic polymers.

Uses: Organic nanomaterials find applications in drug delivery, tissue engineering, electronics, flexible displays, sensors, and optoelectronics.

Environmental health and safety impacts: The environmental impact of organic nanomaterials is still under investigation. Depending on their composition and properties, they may exhibit varying levels of biocompatibility and potential toxicity. Assessments of their environmental fate, exposure routes, and potential hazards are crucial for ensuring their safe use and minimizing any adverse effects.

Inorganic Nanomaterials:

Examples: Quantum dots (e.g., cadmium selenide), metal oxide nanoparticles (e.g., titanium dioxide), silver nanoparticles, magnetic nanoparticles (e.g., iron oxide), nanoscale zeolites.

Uses: Inorganic nanomaterials are utilized in electronics, catalysis, solar cells, water treatment, imaging, and antimicrobial applications.

Environmental health and safety impacts: Inorganic nanomaterials may have environmental impacts related to their potential toxicity, persistence, and release into ecosystems. Their interactions with living organisms and ecosystems require careful assessment to ensure their safe use and minimize any negative effects.

Understanding their properties, fate, and behavior in different environments is crucial for responsible development, use, and disposal of nanomaterials.

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The complete ionic equation for the reaction between aqueous Hg2(NO3)2 and aqueous sodium chloride is:
Hg2(NO3)2(aq) + 2 NaCl(aq) → 2 NaNO3(aq) + Hg2Cl2(s)

In this reaction, the Hg22+ ions from Hg2(NO3)2 react with Cl- ions from NaCl to form solid Hg2Cl2 and aqueous NaNO3. The overall reaction can be represented by the following equation:
Hg2(NO3)2(aq) + 2 NaCl(aq) → 2 NaNO3(aq) + Hg2Cl2(s)

The complete ionic equation for the reaction of aqueous Hg2(NO3)2 with aqueous sodium chloride to form solid Hg2Cl2 and aqueous sodium nitrate is:
Hg2(NO3)2 (aq) + 2 NaCl (aq) -> Hg2Cl2 (s) + 2 NaNO3 (aq)
In this equation, (aq) represents aqueous (dissolved in water) and (s) represents solid (precipitate).

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Answer:

D. rhyolite, eclogite, perovskite, stishovite

Explanation:

The crust is the outermost layer of the Earth, which consists of sedimentary rocks. Beneath this layer is the Earth mantle, which is a thick, moving mass of silicate rocks between the crust and the outer core.

In conclusion, it is expected to find rocks and minerals from the crust to the lower mantle in the following order: rhyolite, eclogite, perovskite and stishovite.

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As per the question, the mass of the nitrogen gas m = 22.25 gram.

The latent heat of vaporization of nitrogen = 199.0 j/g

As per the question, the nitrogen gas will condense. During condensation, the nitrogen gas will lose or release heat equal to its latent heat.

Hence, the heat released by nitrogen gas Q = ml = 22.25 × 199.0 J                                                                           = 4427.75 J.

Hence, the amount of heat released will be 4427.75 J.

The formula: can be utilized to determine energy. Q = mc ∆T. In the equation, Q stands for energy expressed in joules or calories, m for mass expressed in grams, c for specific heat, and T for temperature change, which is the difference between the final temperature and the initial temperature. Water has a specific heat of 1 calorie/gram °C.

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Answer:

I'm pretty sure it's body repair But it also maybe energy

Explanation:

Answer: A.

Explanation:

the science or study of how man and animals perform tasks and solve certain types of problems involving use of the body.

Hope this helps!....(bruh this was tuff)

Answer:

2 electrons

Explanation:

Answer:

what I can't understand what you're saying lol

Explanation:

be my friend lol

btw follow me on my another account (sarivigakarthi)...... plz

Answer:

1

Explanation:

M r ( NaCl ) = A r ( Na ) +  A r ( Cl )  =  23 + 35,5  =  58,5

 So, 1 mol of NaCl has a mass of 58,5 g.

Moles of NaCl  =  58,5 g NaCl

times (x)

1 mol NaCl  = 58,5 g NaCl  =  1,00 mol NaCl

According to the mole concept, there are 0.140 moles in teaspoon of salt that contains 5 g.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.Number of moles is calculated as, mass/molar mass.

In this case number of moles is calculated as, 5/35.5=0.140 moles.

Thus, there are 0.140 moles in 5 g teaspoon of salt.

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Answer:

Well, it´s dangerous because it displaces oxygen in the blood and deprives the heart, the brain and other vital organs.

Explanation:

What i mean by that is that breathing carbon monoxide reduces the amount of oxygen that can be transported in the blood stream to critical organs like the heart and brain. It can also causes E.g. dizziness, confusion, unconsciousness and even death.

I hope this answered yor question, if i did misundertood the question do tell me and i will try my best to explain it. Have a nice day!! :)

Answer: 10

Explanation:

10

Given data,

∣q∣=1.6×10−19 Cm

e=9.1×10−31 kgm

n≈m

p​=1.67×10−27

kgr≈5.28×10−11 m

Formula:

F e = 4πϵ 0 1 r2q e q n​​

F g  = G r 2m e m n

​​Given that,

∣q∣=1.6×10−19 C,

r≈5.28×10−11 m,

m e​=9.1×10−31 kg

 m n≈m p​=1.67×10−27 kg.

F e = 4πϵ 0 1 r2q e q

n​  =  9 × 10 9 N.

m2C−2 × 1 × (1.6 × 10−19 C)2 / (5.28 × 10−11 m)2

= 8.2 × 10−8 N

Similarly,

F g = G r 2m e m

n​  = 6.67 × 10−11 Nm2kg−2 × (1.67 × 10−27 kg) × (9.1 × 10−31 kg) / (5.28 × 10−11 m)2

= 8.2 × 10−8 N.

The radius of the hydrogen atom is the radius at which the attractive electric force between the proton and the electron equals the gravitational force, or,

FE = FG8.2 × 10−8 N = 8.2 × 10−8 N 5.28 × 10−11 m

= (4πε₀) (1.6 × 10−19 C)2 / r2 G (1.67 × 10−27 kg) (9.1 × 10−31 kg)

Simplifying,

r3 = (4πε₀ / G) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)

The universal gravitational constant is,

G = 6.67 × 10−11 m3 ⋅ kg−1 ⋅ s−2r3

= (4π × 8.8542 × 10−12 F/m) / (6.67 × 10−11 N m2/kg2) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)r

= 5.3 × 10−11 m, approximately.

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