determine the number of bonds and bonds in each of the molecules. h2c=ccl2

Answer:

Reactants have more energy than products

Explanation:

Generally, in an exothermic reaction heat is released. In other words, energy is released. So you start with reactants which have a set amount of stored chemical energy, and you lose some in the reaction. Since energy is 'leaving', the stored chemical energy in the products is less than what we started with in the reactants. When given a graph, you can tell this is true because going from left to right, the line representing the stored chemical energy will start at a higher level than where it ends.

The true statement about an exothermic reaction is that reactants have more energy than products.

An exothermic reaction is one in which the energy of reactants is greater than that of products. As such, energy is given off during the reaction in form of heat.

Thus, the true statement about an exothermic reaction is that reactants have more energy than products.

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When balancing a redox equation in acid, it is important to follow certain steps. Let's assume that the equation given is not provided in the question. To balance the equation, we need to assign oxidation states to each element and identify the species being reduced and oxidized.

In this equation, the IO3– ion is being reduced to I2, and the I– ion is being oxidized to I2. The oxidation state of oxygen is usually -2, and since there are three oxygen atoms in IO3–, the total oxidation state of oxygen is -6. This means that the oxidation state of iodine in IO3– must be +5 in order to balance out the -6 from oxygen. Now, to balance the equation, we start by balancing the atoms other than oxygen and hydrogen. In this case, we have two iodine atoms on the left side and two on the right side, so the iodine atoms are already balanced.

Next, we balance the oxygen atoms by adding H2O molecules to the side that lacks oxygen. In this equation, the right side has two oxygen atoms from I2, so we need to add three H2O molecules to the left side to balance the six oxygen atoms from IO3–.
The equation now becomes:
IO3– + I– → I2 + 3H2O
Now, we balance the hydrogen atoms by adding H+ ions. In this equation, there are already six hydrogen atoms from the three H2O molecules on the left side. Therefore, we need to add six H+ ions to the right side.
The final balanced equation is:
IO3– + I– + 6H+ → I2 + 3H2O
In this equation, the coefficient of IO3– is 1, indicating that one molecule of IO3– is involved in the reaction. The coefficient of IO3– in the correctly balanced equation is 1.

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Nitrous oxide/oxygen analgesia use in dentistry dates back to 1844 and is also known as laughing gas.

It is a colorless, odorless, and tasteless gas that has been used for sedation in dentistry for over 170 years. It is a safe and effective way to manage anxiety and pain during dental procedures.

Laughing gas works by depressing the central nervous system, which results in a feeling of relaxation and reduced sensitivity to pain. It is also a mild anesthetic, which can help to numb the area being treated.

It is administered through a mask that the patient wears over their nose and mouth. The dentist can control the amount of gas that the patient receives.

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Based on the energy usage shown by the graph, the best option for the chemical change represented is the combustion of iron.

The combustion of iron in oxygen leads to the formation of Iron (III) oxide in solid form.

For the combustion of iron to happen, a lot of heat has to be applied to the iron which is why the potential energy of reactants is high. As the reaction progresses, the energy needed reduces as iron (III) oxide is formed.

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Answer:

Can cause sunburn, premature aging of the skin and damage molecules in skin cells

Explanation:

Answer:

pueden afectar directo al adn de las celulas de la piel y son causantes de las quemaduras del sol

Explanation:

Answer:

Strongest intermolecular force

Hydrogen Bonding (H-Bonding)

Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen, and are the strongest intermolecular force.

Hydrogen bonds have the largest dissociation energy.

Hydrogen bond is formed when hydrogen is attached to some electronegative elements like O, N and F.

The dissociation energy is the energy required to break a bond and form two atomic or molecular fragments, each with one electron of the shared pair.

Hydrogen bonds are caused by highly electronegative atoms. They only occur between hydrogen and oxygen, fluorine or nitrogen and are the strongest intermolecular force.

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∂c/∂t represents the rate of change of concentration with respect to time, D is the diffusion coefficient, and ∇·(D∇c) represents the divergence of the diffusion flux.

(a) The total amount of pollutant in the region R can be found by integrating the concentration c(x,y,z,t) over the volume V of the region R. Mathematically, it can be expressed as:

Total amount of pollutant = ∫∫∫V c(x,y,z,t) dV

(b) It is reasonable to assume that the flow J of the pollutant is proportional to the gradient of the concentration, as this relationship is based on Fick's law of diffusion. According to Fick's law, the flow of a substance is proportional to the concentration gradient. Mathematically, it can be expressed as:

J = -D ∇c

Where J is the flow of the pollutant, D is the diffusion coefficient, and ∇c is the gradient of the concentration.

(c) To derive the partial differential equation governing the diffusion of the pollutant, we can apply the continuity equation, which states that the rate of change of the concentration in a given volume is equal to the divergence of the flow. Mathematically, it can be expressed as:

∂c/∂t = -∇·J

Using the relationship from part (b), we can substitute it into the continuity equation:

∂c/∂t = ∇·(D∇c)

This is the partial differential equation governing the diffusion of the pollutant, where ∂c/∂t represents the rate of change of concentration with respect to time, D is the diffusion coefficient, and ∇·(D∇c) represents the divergence of the diffusion flux.

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Answer:

yes it is a chemical change

i have made it in above picture

During hyperventilation, the pH of the blood increases (becomes more alkaline), while the carbon dioxide (CO2) level decreases. These changes are consistent with the prediction.

Hyperventilation refers to an increased rate and depth of breathing, leading to the removal of excess carbon dioxide from the body. As a result, the concentration of carbon dioxide in the blood decreases. Carbon dioxide reacts with water to form carbonic acid (H2CO3), which dissociates into bicarbonate ions (HCO3-) and hydrogen ions (H+). By reducing the carbon dioxide level, there is less production of H+ ions, resulting in an increase in blood pH, making it more alkaline.

The observed changes in pH and carbon dioxide levels during hyperventilation are consistent with the predicted response. Increased ventilation causes more carbon dioxide to be expelled from the body, shifting the equilibrium of the carbonic acid-bicarbonate buffer system. As a consequence, the pH of the blood rises, leading to alkalosis. These changes can be confirmed through blood gas analysis or other diagnostic tests.

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Answer: Yes, light can bend around corners. ... The ability of light to bend around corners is also known as "diffraction". There are two mechanisms that cause light to bend around corners. Light waves indeed bend around corners because of diffraction, as shown in this illustration.

Explanation:

Answer:

1.true

2.2

3. false

Explanation:

.........

Answer:

I think the answer is

2) They have the same number of valence electrons

Answer:

B.

\(from \: eisteins \: energy \: relation : \\ E = hf \\ h \: is \: plancks \: constant\\ 3.26 \times {10}^{ - 19} = 6.63 \times {10}^{ - 34 } \times f \\ f = \frac{3.26 \times {10}^{ - 19} }{6.63 \times {10}^{ - 34} } \\ f = 4.92 \times {10}^{14} \: Hz\)

The given double displacement reaction can be balanced as written below:

\(\rm 3CaCl_{2} + 2Na_{3}PO_{4} \rightarrow Ca_{3}PO_{4} + 6 NaCl \\\)

Displacement reactions are those in which one or two groups are replaced to form the new products. There are both single displacement reaction and double double displacement reactions.

In single displacement reactions, only one reactant will be replaced in the reaction whereas in double displacement reactions, two groups from the reactants are exchanged each other.

In the given reaction, the phosphate group is replaced to Ca and the Cl is group is shifted to Na metal as written in the chemical equation.

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Higher atmospheric carbon dioxide concentrations could lead to an increase in global temperatures, which could potentially impact sea turtle populations.

Warmer temperatures could lead to an increase in the proportion of female sea turtles being hatched, as warmer incubation temperatures are more likely to result in female hatchlings. This could lead to a skewed sex ratio, as there may be fewer male turtles to mate with the female turtles.

In addition to affecting the sex ratio of sea turtle hatchlings, higher temperatures could also impact other aspects of their development, such as the timing of hatching and the success of hatchlings in reaching the ocean.

Changes in temperature could also impact the availability of food and nesting sites for sea turtles, which could further impact their population dynamics.

Overall, the impact of higher atmospheric carbon dioxide concentrations on sea turtle populations will depend on a variety of factors, including the magnitude and rate of temperature increase, as well as other environmental factors that could impact sea turtle development and survival.

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Answer:

1.04

Explanation:

Answer:

Explanation:

Metamorphic rocks started out as some other type of rock, but have been substantially changed from their original igneous, sedimentary, or earlier metamorphic form. Metamorphic rocks form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.

Answer: metamorphic

Explanation:

Edge:)

1.84 pressure (in atm) is applied by a segment of mercury 1.30 m high? the thickness of mercury is 13.5951 g/cm3.

Thickness of mercury= 13.5951 g/cm cubed, gravitational constant= 9.80665 m/s squared , 1 atm= 101,325 Pa= 760 torr mm Hg)

1.401000mm/1m1atm/760= 1.84

The ideal gas regulation, PV = nRT. In this equation, 'P' is the pressure in atmospheres, 'V' is the volume in liters, 'n' is the number of particles in moles, 'T' is the temperature in Kelvin and 'R' is the ideal gas steady (0.0821 liter atmospheres per moles Kelvin).

The pressure of our segment liquid mercury is equivalent to the thickness of mercury, 13,595 kilograms for every meter cubed, times the speed increase because of gravity, 9.81 meters each second squared, times the level of the liquid mercury, 0.760 meters. At the point when we increase out these three values, we get a pressure of 101,358.88 pascals.

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It is true that according to Hubble's law, the farther away a galaxy is, the faster it is moving away from us.

It is true that the formation of a star occurs when nuclear fusion begins to fuse light elements into heavier ones;

The distance to the nearest stars can be determined by parallax, the apparent shift of a start against background stars observed as the earth moves along its orbit. (Option B)

Based on the accompanying H-R Diagram, the type of start that has the greatest temperature is the blue giants (Option C)

Two hydrogen atoms come together in a nuclear fusion reaction to produce Helium Gas. (Option A).

Hubble's law, which essentially states that the velocity of a galaxy (or, as it is commonly plotted, its redshift) is precisely proportionate to its distance, also reveals crucial information about the condition of the universe. There should be no relationship between distance and velocity if the cosmos is static and unchanging.

Hubble's law is the physical cosmology observation that galaxies move away from Earth at a rate proportionate to their distance. In other words, the farther they are from Earth, the quicker they are travelling away.

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The given statement, "Amide bonds can be hydrolyzed under only acidic conditions" is false.

Amide bonds can undergo hydrolysis under both acidic and basic conditions. In acidic conditions, the amide bond is hydrolyzed by the addition of water and a proton (H+), resulting in the formation of a carboxylic acid and an amine.

However, under basic conditions, amide hydrolysis can occur through nucleophilic attack by hydroxide ions (OH-), leading to the formation of a carboxylate anion and an amine.

So, while amide hydrolysis is commonly associated with acidic conditions, it can also occur under basic conditions.

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Answer:

nuclear vision provides energy for nuclear power and drives the explosion of nuclear weapons both uses are possible because certain substances called nuclear fuels undergo visions when struck by fishing neutrons and turned into emit neutrons when they break apart

Explanation:

I remember taking this test and seen this on the test and it was correct

It is not possible to solve the given system of differential equations. The system needs to be solved using numerical methods.

A nonlinear irreversible chemical process is described by the following governing equations 2.1 and 2.2. CA is the concentration of the chemical product that depends on temperature. The temperature, T, is not constant and the rate of reaction is a function of temperature. The governing equations are given below:

Equation:

2.1: dCA/dt= -k(T)CA

Equation :

2.2: dT/dt= -q(T)CA

The given differential equations form a system of two ordinary differential equations with two dependent variables CA and T. The values of k(T) and q(T) depend on temperature T and are the coefficients of the governing equations.The given differential equations are nonlinear differential equations since CA and T appear in the coefficients of the differential equations.

These equations are also irreversible as the rate of change of the product CA depends only on the concentration of the reactants and not on the concentration of the product (CA). The initial conditions are not given in the question. Hence, it is not possible to solve the given system of differential equations. The system needs to be solved using numerical methods.

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Engineers designing a new energy efficient product will make the first model called a prototype.

A prototype is the initial model that engineers create in order to test and evaluate the feasibility of their design. This model is usually made using cheaper and more readily available materials compared to the final product.

The purpose of the prototype is to identify any design flaws or areas for improvement, and make the necessary changes before moving forward with the production process. Engineers will often make multiple prototypes until they are satisfied with the design and performance of the product.

In the case of energy-efficient products, engineers will focus on developing a prototype that utilizes minimal energy consumption while still providing the desired level of functionality. This requires careful consideration of the materials and components used in the product, as well as the design of the product itself.

Once the prototype has been tested and refined, engineers can move on to creating the final product. By creating a prototype first, engineers can ensure that their design is both efficient and effective, ultimately resulting in a product that is better for both the environment and the consumer.

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Isotopes are atoms that belong to the same element: 11 protons, 10 neutrons, 11 electrons, 13 protons 14 neutrons, and 13 electrons

An isotope is one of two or more atom types of a chemical element that share the same atomic number, position on the periodic table, chemical behavior, and physical properties, but differ in atomic mass. One or more isotopes can be found in any chemical element. The number of protons in an atom's nucleus is the first criterion for determining its identity and labeling.

The observation that all atoms with the same atomic number have roughly the same chemical properties—if not exactly the same—gives this atomic number its significance. The symbol Z is typically used to represent this number. An ingot of pure uranium, for instance, only contains atomic number 92 atoms. Each atomic number has a place on the periodic table of elements, and each of these places is labeled with the element's common name, like calcium, radon, or uranium.

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The triple point can be seen from the graph that has been attached here.

The triple point is a special combination of temperature and pressure where the equilibrium of a substance's three phases—solid, liquid, and gas—occurs. The transition between phases happens with no discernible net change in the substance because the solid, liquid, and gas phases are in perfect equilibrium at the triple point.

A crucial reference point in thermodynamics, the triple point is frequently used to specify temperature scales and calibrate thermometers. Each substance has a specified value for temperature and pressure.

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To prepare 1 liter of 0.9% solution of sodium chloride, the amount of 15% solution of sodium chloride needed is 60ml and the amount of water needed is 940 ml (more than 100).

Explanation:Given that,Concentration of sodium chloride solution = 15%Required concentration of sodium chloride solution = 0.9%Volume of the solution to be prepared = 1 LTo calculate the amount of 15% solution of sodium chloride, use the formula.

C₁V₁ = C₂V₂Where,C₁ = concentration of 15% solution of sodium chlorideV₁ = volume of 15% solution of sodium chloride to be takenC₂ = concentration of 0.9% solution of sodium chlorideV₂ = volume of 0.9% solution of sodium chloride to be preparedLet V₁ be the volume of 15% solution of sodium chloride needed.Thus, C₁V₁ + C₂V₂ = C₂VTaking C₁ = 15% = 15/100 = 0.15, C₂ = 0.9% = 0.9/100 = 0.009 and V₂ = 1L, we get0.15V₁ + 0.009(1 - V₁) = 0.009(1)0.15V₁ + 0.009 - 0.009V₁ = 0.0090.141V₁ = 0.009 - 0.009V₁0.150V₁ = 0.009V₁ = 0.009/0.150 = 0.06 L = 60 ml.

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Answer:

VELOCITY

Explanation:

VELOCITY IS THE SPEED AND DIRECTION OF MOVEMENT

Explanation:

velocity

reason: The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object's speed and direction of motion (e.g. 60 km/h to the north).

If a person ingested 55 mg of Po-218, they would be exposed to a dose of radiation of 1.57 × 10^-3 Ci.

The first step is to calculate the initial number of Po-218 atoms in the sample:

Convert the mass of the sample to grams:

55 mg = 0.055 g

Calculate the number of moles of Po-218:

n = m/M

where:

m = mass of sample = 0.055 g

M = molar mass of Po-218 = 218.008965 g/mol

n = 0.055 g / 218.008965 g/mol = 2.52 × 10^-4 mol

Calculate the initial number of atoms:

N = n × Avogadro's number

where:

Avogadro's number = 6.022 × 10^23 mol^-1

N = 2.52 × 10^-4 mol × 6.022 × 10^23 mol^-1 = 1.52 × 10^20 atoms

The second step is to calculate the number of alpha emissions that occur in 25.0 minutes:

Calculate the fraction of Po-218 that remains after 25.0 minutes:

t1/2 = 3.0 minutes

Nt/N0 = 1/2^(t/t1/2)

where:

Nt/N0 = fraction of Po-218 that remains after time t

t = 25.0 minutes

Nt/N0 = 1/2^(25/3) = 0.0088

Calculate the number of alpha emissions:

The number of alpha emissions is equal to the initial number of atoms minus the number of atoms remaining after 25.0 minutes, multiplied by 2 (since each alpha emission results in the loss of 2 nucleons).

Number of alpha emissions = 2 × N0 × (1 - Nt/N0) = 2 × 1.52 × 10^20 × (1 - 0.0088) = 2.96 × 10^18

The third step is to calculate the dose of radiation that a person would be exposed to if they ingested the polonium:

Calculate the activity of the polonium sample:

Activity = decay constant × number of atoms

where:

decay constant = ln(2)/t1/2 = 0.231 min^-1 (from t1/2 = 3.0 minutes)

number of atoms = 1.52 × 10^20

Activity = 0.231 min^-1 × 1.52 × 10^20 = 3.51 × 10^19 disintegrations per minute (dpm)

Calculate the dose in curies (Ci):

1 Ci = 3.7 × 10^10 disintegrations per second (dps)

Dose (in Ci) = Activity (in dpm) / (3.7 × 10^10 d/s/Ci) / 60 s/min = 1.57 × 10^-3 Ci

Therefore, if a person ingested 55 mg of Po-218, they would be exposed to a dose of radiation of 1.57 × 10^-3 Ci.

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