The formula for calculating kinetic energy is ________​

Answer:

A. 1,4-dimethylbenzene

Explanation:

The compound CH,CH;CH,CH3 is a benzene derivative with two methyl groups attached to the benzene ring. The positions of the methyl groups on the ring are indicated by the numbers 1 and 4, which correspond to the carbon atoms at the end of the two double bonds in the benzene ring. This compound is therefore 1,4-dimethylbenzene. The other options listed are not correct because they contain the wrong number or type of substituents on the benzene ring.

Answer:

0,005

Explanation:

number of moles=mass/molecular mass

therefore it's going to be 0,20g over 40g/mol

which is 0,20g/40g/mol... grams and grams will cancel making the answer 0,005moles

Answer:

B

Explanation:

Exergonic reactions are also called spontaneous reactions, because they can occur without the addition of energy. ... In this case, the products, or final state, have more free energy than the reactants, or initial state. Endergonic reactions are non-spontaneous, meaning that energy must be added before they can proceed.

Exergonic reactions were often known as spontaneous reaction. since they can take place without the expenditure of energy.

A reaction wherein energy is emitted mostly in presence of light or heat was known as just an exothermic reaction.

What is spontaneous reaction?

A spontaneous process would be one that happens without the system receiving any outside input.

Because exergonic events could proceed without the supply of energy, they are sometimes known as spontaneous reactions. The products possess greater free energy as compared to  the reactants example. Endergonic reactions were non-spontaneous, which means they require the addition of energy before they can begin.

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To generate 5.3 moles of \(N_{5}O_{7}\), roughly 1.595 * \(10^{25}\) molecules of N are required.

To determine the number of molecules of N (nitrogen) needed to produce 5.3 moles of \(N_{5}O_{7}\), we need to consider the stoichiometry of the compound \(N_{5}O_{7}\).

The formula \(N_{5}O_{7}\) indicates that there are five nitrogen atoms (N) in one molecule of \(N_{5}O_{7}\). Therefore, we can use the concept of Avogadro's number to calculate the number of molecules of N required.

Avogadro's number states that there are 6.022 × \(10^{23}\) particles (molecules or atoms) in one mole of any substance. In this case, we need to convert the given quantity of moles (5.3 moles) to the corresponding number of molecules.

First, we calculate the number of moles of N in 5.3 moles of \(N_{5}O_{7}\):

5.3 moles \(N_{5}O_{7}\) × 5 moles N / 1 mole N5O7 = 26.5 moles N

Then, we can convert the moles of N to the number of molecules of N using Avogadro's number:

26.5 moles N × 6.022 × \(10^{23}\) molecules / 1 mole = 1.595 × \(10^{25}\) molecules of N

Therefore, approximately 1.595 × \(10^{25}\) molecules of N are needed to produce 5.3 moles of \(N_{5}O_{7}\).

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It will take approximately 72.9 years (to the nearest tenth of a year) for the trichloroethene  (TCE) concentration to degrade down to the MCL of 5 μg/L.

To calculate the time it will take for TCE to degrade down to the MCL (Maximum Contaminant Level) concentration of 5 μg/L, we can use the concept of "first-order decay" for the degradation process. The formula for first-order decay is:

C(t) = C0 * e^(-kt)

where:

C(t) = concentration at time t

C0 = initial concentration (120 kg/L)

e = base of the natural logarithm (approximately 2.71828)

k = first-order decay rate constant

t = time

The half-life (t1/2) of TCE is given as 24 months, which means that the concentration will decrease to half its initial value in 24 months. The half-life is related to the first-order decay rate constant (k) as follows:

t1/2 = ln(2) / k

Solving for k:

k = ln(2) / t1/2

k = ln(2) / 24 months

Now, we can calculate the time (t) it will take for the concentration to reach 5 μg/L (MCL):

5 μg/L = 120 kg/L * e^(-kt)

t = ln(5 μg/L / 120 kg/L) / -k

t = ln(5e-6 / 120) / - (ln(2) / 24)

t ≈ 72.9 years

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Answer:

N=35%. so 35/100*7 =2.45%

H=5.0 so 5/100*1=0.05%

o=60% so 60/100*8=4.8%

Answer:  True. Only primary alcohols can be oxidized to carboxylic acids using an oxidizing agent such as potassium permanganate (KMnO4) or chromium trioxide (CrO3) in an acidic solution. Secondary alcohols can be oxidized to ketones, but not to carboxylic acids, while tertiary alcohols cannot be oxidized at all using these reagents.

Explanation:

Answer:

I Choosed:

A. They can end up as waste products that sometimes can’t be recycled.

B. They sometimes release toxins into the environment.

C. They use materials from Earth that are nonrenewable.

Explanation:

A. Synthetic polymers, such as plastic, can end up as waste in landfills, oceans, and other natural areas. This can cause a variety of environmental problems, as some types of plastic do not break down easily and can persist in the environment for decades or even centuries. This accumulation of waste can have negative impacts on wildlife, ecosystems, and human health.

B. Some synthetic polymers are made using harmful chemicals that can leach out and release toxins into the environment. These toxins can have negative impacts on wildlife, ecosystems, and human health. For example, some types of plastic contain chemicals such as bisphenol-A (BPA) that have been linked to hormone disruption and other health problems.

C. The production of synthetic polymers often requires the use of nonrenewable resources, such as petroleum and natural gas. These resources are finite and their extraction and processing can cause environmental damage, including air and water pollution and habitat destruction. The continued use of these nonrenewable resources can exacerbate environmental problems and contribute to climate change.

These are three ways that synthetic polymers can affect the environment, and it's important to consider the impacts of these materials in order to minimize their negative effects and promote sustainability.

zooplankton cod and krill

Answer:

Explanation:

There are many observations, but the three that stand out for me are:

According to the question, if A bowling ball rolls 2.5 m in 0.98 s, the bowling ball's average speed was 2.55 meters per second.

The average speed of the bowling ball can be calculated by dividing the total distance traveled by the time taken, so we get:

Average speed = distance/time

In this case, the distance traveled by the bowling ball is 2.5 meters and the time taken is 0.98 seconds, so:

Average speed = 2.5 m/0.98 s

Simplifying this expression gives:

Average speed = 2.55 m/s

Therefore, the bowling ball's average speed as calculated above was 2.55 meters per second.

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Answer:

True

Explanation:

Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.

For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water which bypasses the conversion to liquid stage and goes straight to the gaseous form.

A motorist will be able to hear the sound the least through a soundproof wall, hear it the most across a big empty space, and hear it the least through trees because they take longer to dampen a sound.

Sounds bends vertically upward during the day because the earth is hotter than that of the air above it.

Roadway sound is the total sound energy produced by moving cars.Road surface, tyre, engine/transmission, aerodynamic, and brake components make up the majority of it.

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Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9. The basicity constant, or Kb, is a measure of the strength of a base in a particular chemical reaction. The products of a reaction of a weak base and water with the corresponding acid determine the base constant.

For example, for a given acid and base, Kb1 and Kb2 are the basicity constants for the first and second base dissociations, respectively, of the base. The formulas and charges of the conjugate acid and base, as well as the acid dissociation constants, Ka1 and Ka2, are needed to calculate Kb1 and Kb2.

The following reactions are balanced chemical reactions that represent the dissociation of succinic acid:

Reaction 1: H2C4H4O4(aq) + H2O(l) ⇌ HC4H4O4(aq) + H3O+(aq) Ka1 = 6.2 × 10−5
Reaction 2: HC4H4O4(aq) + H2O(l) ⇌ C4H4O42-(aq) + H3O+(aq) Ka2 = 2.3 × 10−6

The values of Ka1 and Ka2 can be used to calculate Kb1 and Kb2, respectively, using the following equation:

Ka1 × Kb1 = Kw

where Kw is the ion-product constant for water, which is 1.0 × 10−14 at 25°C.

Kb1 can be calculated as follows:

Kw = Ka1 × Kb1

Kb1 = Kw / Ka1

Kw = 1.0 × 10^-14

Ka1 = 6.2 × 10^-5

Kb1 = Kw / Ka1

Kb1 = 1.0 × 10^-14 / 6.2 × 10^-5

Kb1 = 1.61 × 10^-10

Kb2 can be calculated using the same method:

Kw = Ka2 × Kb2

Kb2 = Kw / Ka2

Kw = 1.0 × 10^-14

Ka2 = 2.3 × 10^-6

Kb2 = Kw / Ka2

Kb2 = 1.0 × 10^-14 / 2.3 × 10^-6

Kb2 = 4.35 × 10^-9

Therefore, Kb1 = 1.61 × 10^-10 and Kb2 = 4.35 × 10^-9.

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The formula for a compound made from x2 and y- can be predicted using the crisscross method.

X2 has a charge of 2+ while y- has a charge of 1-. To form a neutral compound, the charges must balance each other.

To do this, the charge of x2 will become the subscript of y, and the charge of y- will become the subscript of x2.

Thus, the formula for the compound will be written as X2Y.

This indicates that two atoms of x combine with one atom of y to form the compound.

The compound may have different properties and characteristics depending on the identity of the elements X and Y.

Overall, the crisscross method is an effective way to predict the formula of an ionic compound.

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Answer: pH=−log(3.1×10−3M)=2.508638306 =2.51

Explanation:

There are two ways you can do this. The easy way is to realize that

HCl

is a strong acid, so its dissociation is considered complete, and

[HCl]=[H+].

EASY WAY

Recall:

pH=−log[H+]

From the knowledge that

pH=−log[H+]=−log[HCl], we can say:

pH=−log(3.1×10−3M)=2.508638306 =2.51

Calcium reacts with water according to the balanced equation Ca(s) + H2O(l) ==> Ca(OH)2(aq) + H2(g). The aqueous product of this reaction can be heated to evaporate the water, leaving a white solid, Ca(OH)2(s).

When it comes to comparing the electrical conductivity of the aqueous product in the reaction to the electrical conductivity of the white solid that remains after the water is evaporated from the solution, it is important to note that aqueous products of reactions are usually electrolytes.

Electrolytes are those that can conduct electricity when dissolved in water or molten, as they have free ions. They also have electrical conductivity, which implies that they can transfer electrical charges from one place to another. Calcium hydroxide, Ca(OH)2, is a white solid that is slightly soluble in water, hence it does not conduct electricity in a significant way when it is not dissolved. Calcium hydroxide is not an electrolyte when it is not dissolved.

On the other hand, Ca(OH)2(aq) is a strong electrolyte since the product of the reaction is a highly soluble ionic compound. As a result, it can conduct electricity well. As a result, we can conclude that the electrical conductivity of the aqueous product in the reaction is higher than the electrical conductivity of the white solid that remains after the water is evaporated from the solution.

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Answer:

I think it's true

2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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An oxidation number is a concept in chemistry that represents the hypothetical charge that an atom would have if all the bonds in a compound were purely ionic. It is used to keep track of electron transfer in chemical reactions and identify redox (reduction-oxidation) reactions.

In a redox reaction, there is a transfer of electrons from one reactant to another. The reactant that loses electrons is said to be oxidized, while the reactant that gains electrons is said to be reduced. The oxidation number of an atom helps determine whether it is undergoing oxidation or reduction.

The rules for assigning oxidation numbers are as follows:

In an elemental state, atoms have an oxidation number of zero.

For monatomic ions, the oxidation number is equal to the charge of the ion.

In compounds, some elements have commonly observed oxidation numbers. For example, oxygen is typically assigned an oxidation number of -2, and hydrogen is typically assigned an oxidation number of +1.

The sum of oxidation numbers in a neutral compound is zero, and in an ion, it is equal to the ion's charge.

By comparing the oxidation numbers of an element in a reactant and a product, one can determine if there has been an increase or decrease in the number of electrons associated with that element. This indicates whether oxidation or reduction has occurred.

However, it's important to note that except for ionic compounds, oxidation numbers do not have any physical significance. They are simply a tool to aid in understanding electron transfer in chemical reactions. In covalent compounds, where electrons are shared rather than transferred, oxidation numbers are hypothetical charges and do not reflect the actual charge or distribution of electrons.

In summary, oxidation numbers are used to identify redox reactions by tracking the transfer of electrons. They provide a convenient way to determine if an element has been oxidized or reduced. However, their significance is limited to ionic compounds, as they do not represent the true charge or electron distribution in covalent compounds.

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We would need to dig up 0.233 kg of this ore to have 50.0 g of nickel.

To find the amount of ore required to obtain 50.0 g of nickel, we can use the following calculation:

Ore required = (Desired amount of nickel) / (Percentage of nickel in the ore)

First, we need to convert 50.0 g of nickel to kilograms: 50.0 g = 0.050 kg

Next, we'll use the percentage of nickel in the ore:

Ore required = (0.050 kg) / (0.215) = 0.233 kg

So, you would need to dig up 0.233 kg of this ore to have 50.0 g of nickel.

Dimensional analysis is a crucial component of calculations in chemistry since it transforms one unit or quantity into another. You must first determine the conversion factors in order to get the desired unit before doing the conversion. Expressing a given unit to another unit is crucial because some chemistry problems call for conversions to be made before applying a particular equation.

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The attractions between the H2O and NH3 would be dipole-dipole.

The attractions between the H2O and NH3 would be dipole-dipole. NH3, also known as ammonia, is a polar molecule. The molecule is made up of nitrogen and hydrogen.

Due to the difference in electronegativity, the molecule's electrons are pulled closer to the nitrogen atom, causing a dipole moment. The molecule has a partial positive charge on the hydrogen atoms and a partial negative charge on the nitrogen atom. Water is also a polar molecule with a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.

Dipole-dipole attractions occur between polar molecules, like NH3 and H2O, which have partial positive and negative charges. These forces are stronger than London dispersion forces, but weaker than ion-dipole forces. Dipole-dipole forces increase as the difference in electronegativity between the atoms in the molecule increases. The strength of the dipole-dipole force is dependent on the distance between the polar molecules and the angle of the polar bonds. This attractive force is significant in forming hydrogen bonds. Hence, the attractions between the H2O and NH3 would be dipole-dipole.

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About one-third of the toxic metal, mercury (hg), is released into the atmosphere from natural sources such as rocks, soil, volcanoes, and the ocean. the remaining two-thirds comes from human activities. option A is correct.

First, mercury is naturally emitted into the air from volcanoes, rock weathering, forest fires, and soil. Second, mercury is released into the air by burning fossil fuels and municipal or medical waste.

Mercury persists in the environment for long periods of time by cycling back and forth between air and soil, changing chemical forms in the process. The atmospheric lifetime of inorganic elemental mercury is estimated to be up to two years, while organic methylmercury can remain in soil for decades. Mercury is never removed from the environment; it just moves to other places and eventually gets buried under soil and sediments

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The angular momentum quantum number (l) in a hydrogen atom determines several properties of the orbitals. Firstly, it determines the shape of the orbital.

Orbitals with different angular momentum quantum numbers have different shapes, such as s, p, d, and f orbitals. Secondly, it determines the possible orientation of the orbital in space. Orbitals with higher angular momentum quantum numbers have more complex orientations. Thirdly, it determines the energy of the orbital. Orbitals with higher angular momentum quantum numbers have higher energies, which affects the overall energy level of the atom. Finally, it also indirectly determines the possible number of electrons that can occupy a particular orbital, as the Pauli exclusion principle and the Aufbau principle dictate that each orbital can only hold a maximum of two electrons with opposite spins. Therefore, the angular momentum quantum number plays a crucial role in determining the properties and behavior of electrons in hydrogen atoms.

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gram of NO=5

2NO = 2N+O2

2×2.50=x

x=5

The mass of nitrogen monoxide  produced from 2.5 grams of oxygen is 1.875 grams

4NH₃ + 50₂ → 4NO + 6H₂0

The limiting reagent is 0₂ because the least moles of this are used in the reaction.

Therefore, it will determine the amount of product formed.

From the chemical reaction above

10(16) g of 0₂ gives (4×14 + 4×16) g of NO

2.50 g of 0₂ will give ? of NO

cross multiply

mass of NO formed = 2.50 × 120 / 160

mass of NO formed = 300 / 160

mass of NO formed = 1.875 grams

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On a train ride cross-country, the trees, buildings, and people appear to be speeding by the window. This is because the train is moving in the forward direction.

Scientists use the shared system for making measurements. This system is also called system of international.

Physical science studies the relationships between natural but non-living objects. Physical science is ordinarily thought of as consisting of four broad areas: astronomy, physics, chemistry, and the Earth sciences.

If 6.6 tyrannosaurs weigh 30,000 kg, then one tyrannosaur weigh about 4545 kg. For most activities, the earth makes a handy frame of reference.

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Answer:

Explanation:

.......

Answer:

Gas

Explanation:

Solid= Particles are really tight (Example: Ice Cube) Has a fixed shape

Liquid= Particles flow freely but is of constant volume.(Liquid fills it's container. Example: Water) No fixed shape

Gas= Particles move freely can fill its container has NO FIXED SHAPE or NO FIXED VOLUME(Example: Oxygen) Particels move FASTEST

To identify any formal charges in acetylcholine and use the "+" and "-" tools to add any missing formal charges, follow these steps:
1. Determine the total number of valence electrons for each atom in the molecule.
2. Assign electrons to each atom according to the Lewis structure rules.
3. Calculate the formal charge for each atom using the formula: Formal Charge = Valence Electrons - (0.5 x Bonding Electrons + Non-Bonding Electrons).

Since a drawing of acetylcholine was not provided, I cannot add the missing formal charges directly to the drawing. However, I can still help you identify the formal charges in the molecule.
Acetylcholine consists of a quaternary ammonium cation and a carboxylate anion:
Cation:
- Nitrogen (N) atom in the center with four covalent bonds and a formal charge of +1
- Three methyl (CH3) groups bonded to N with no formal charges
- One acetyl (CH3COO-) group bonded to N with a formal charge of -1 on the oxygen atom with a single bond to the carbon
Anion:
- One carboxylate group (CH3COO-) with a formal charge of -1 on the oxygen atom with a single bond to the carbon
In summary, acetylcholine has three atoms with formal charges: +1 on the central nitrogen atom and -1 on two oxygen atoms.

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Answer

Explanation

In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.

S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.

For SiCl₄, the valence electron on each atom coming together to form the molecule is:

Valence electron on Si = 4

Valence Electron on Cl = 7

Total valence electron on SiCl₄ = 4 + (4 x 7) = 32

The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.

A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.

Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is