Ayuda por favor no entiendo nada voy a reprobar 2- Completa el siguiente cuadro indicando la cantidad de partículas subatómicas fundamentales para cada uno de los siguientes átomos: Atomos | N° atómico | N° de protones | N° de electrones | N° de neutrones 7 Li 20Ne 35Cl 31P 80Br 14C

Answer:

Sugar was the solute and water was the solvent.

Answer:

C

Explanation:

The early ideas of the atom states that the indivisible object is hollow or is a solid object with nothing inside. The later discoveries or works of the scientists states that inside the atoms are the subatomic particles which are the electrons, protons, and neutrons.

Minerals are naturally occurring, inorganic solids with a defined chemical composition and regular internal crystal structure.

The definition of a mineral is a substance that meets five specific criteria: it must be naturally occurring, inorganic, solid, have a definite chemical composition, and possess a crystalline structure. The crystalline structure refers to the arrangement of atoms or ions in an orderly, repeating pattern that extends in all three spatial dimensions. This regular arrangement of atoms or ions gives minerals their characteristic geometric shapes and physical properties. The crystal structure of minerals can be determined using X-ray diffraction, and the study of minerals is important in a wide range of scientific fields, including geology, chemistry, and materials science.

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Answer:

2.18 × 10³L

Explanation:

2178 litres of CO2 is produced in the combustion reaction.

HOW TO CALCULATE VOLUME

Density = mass ÷ volume

no of moles. = 5.9 × 10²⁵ ÷ 6.02 × 10²³

no. of moles = 5.9/6.02 × 10²

no. of moles = 0.98 × 10²moles

= 98moles

Moles = mass ÷ molar mass

Mass of CO2 = moles × molar mass

Molar mass of CO2 = 12 + 16(2) = 44g/mol

Mass of CO2 = 98 × 44

Mass of CO2 = 4312g = 4.312kg

Volume = 4.312kg ÷ 1.98kg/m³

Volume = 2.178m³

Since 1m³ = 1000L

2.178m³ = 2.178 × 1000

= 2178 liters.

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The fraction of the strontium-90 absorbed in 1963 that remained in people's bones in 1994 is approximately 0.1507 or 15.07%.

The half-life of strontium-90 is 27 years.

Therefore, we can use the following formula to calculate the fraction of strontium-90 that remained in people's bones in 1994:

fraction = (1/2)^(t/h)where t is the time elapsed and h is the half-life of the substance.

In this case, t = 1994 - 1963 = 31 years, and h = 27 years.

So, the fraction of strontium-90 that remained in people's bones in 1994 is:

fraction = (1/2)^(31/27)≈ 0.1507 (rounded to 3 decimal places)

Therefore, the fraction of the strontium-90 absorbed in 1963 that remained in people's bones in 1994 is approximately 0.1507 or 15.07%.

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The  pressure (in torr) of the “dry” hydrogen would be 704.06 torr.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under certain conditions. The ideal gas equation can be written as-

                        PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

The ideal gas law is a combination of Boyle's law and Charles' law. These law are applicable on real gases after small modifications in pressure and volume.

Given,

Initial volume = 59.9 L

Initial temperature =  76.0 °C

Initial pressure = 387 torr

Final volume = 13.3 L

Final temperature = 30.7°C

\(\frac{P_{1}V_{1} }{T_{1} } = \frac{P_{2}V_{2} }{T_{2} }\)

( 387 × 59.9 )÷ 76 = ( P × 13.3 ) ÷ 30.7

P = 704.06 torr

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The following conversions from moles to liters and vice versa are:

5 moles H₂O x (22.4 L H₂O/1 mole H₂O) = 112 L H₂O

10 mole O₂ x (22.4 L O₂/1 mole O₂) = 224 L O₂

500 L H₂ x (1 mole H₂/22.4 L H₂) = 22.3 moles H₂

85 L Br₂ x (1 mole Br₂/44.6 L Br₂) = 1.91 moles Br₂

100 L He x (1 mole He/22.4 L He) = 4.46 moles He

8 moles Cl₂ x (22.4 L Cl₂/1 mole Cl₂) = 179.2 L Cl₂

22.4 L x (1 mole/22.4 L) = 1 mole

1000 L Ne x (1 mole Ne/22.4 L Ne) = 44.6 moles Ne

11 moles Cl₂ x (22.4 L Cl₂/1 mole Cl₂) = 246.4 L Cl₂

The number of moles of gas in a given volume can be calculated using the ideal gas law: PV = nRT, where P = pressure, V = volume, n = number of moles, R = ideal gas constant, and T = temperature in Kelvin.

Assuming standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm, respectively, the calculation would be:

PV = nRT

(1 atm) (55.5 L) = n (0.0821 L•atm/mol•K) (273.15 K)

n = (1 atm) (55.5 L) / (0.0821 L•atm/mol•K) (273.15 K)

n = 2.12 mol

Therefore, the balloon contains approximately 2.12 moles of gas.

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Answer:

The new pressure becomes one third of the initial pressure.

Explanation:

The relation between pressure and volume at constant temperature is given by :

\(P\propto \dfrac{1}{V}\\\\P=\dfrac{1}{V}\)

Let new pressure and volume be P' and V' respectively.

V'=3V (given)

So,

\(P'=\dfrac{1}{V'}\\\\=\dfrac{1}{3V}\\\\=\dfrac{1}{3}\times \dfrac{1}{V}\\\\P'=\dfrac{1}{3}\times P\)

Hence, new pressure becomes one third of the initial pressure.

Answer:

A positive acceleration means and increase

A negative acceleration is a decrease

a zero acceleration is a constant movement so its not increasing or decreasing just constant

Explanation:

What is a positive acceleration ?

If the velocity of an object increases with time, its acceleration is positive.

What is a zero acceleration ?

Zero acceleration is an acceleration, just with zero magnitude. Motion with constant velocity is just a special case of motion with uniform acceleration.

What is a negative acceleration ?

A negative acceleration means you will subtract from the current value of the velocity, and a positive acceleration means you will add to the current value of the velocity. ... And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.

Answer:

They both have the same temperature.

Explanation:

When two or more substances of different temperature are mixed, heat is transfered from hot to clod substances till they attain thermal equilibrium i.e have the same temperature

Answer:

Deben ser de igual número.

Explanation:

The rate constant for the nuclide is 0.0803 min1.

What is first-order kinetics?

First-order kinetics refers to a type of chemical reaction in which the pace of the reaction is proportional to the amount of the reactant and is dependent only on the concentration of one component.

Two examples of first-order reactions are the aspirin hydrolysis and the reaction of t-butyl bromide with water to yield t-butanol. An such procedure that appears to have first-order kinetics is the hydrolysis of the anticancer drug cisplatin.

The concentration of one of the reactants affects the rate of a first-order reaction. The product of the concentrations of two reactants or the square of the concentration of a reactant determines the second-order reaction rate.

The rate constant for a first-order reaction can be determined by using the following equation:

k = -ln(N2/N1)/(t2-t1)

where N1 is the initial number of moles (12.9 g/98 g/mol = 0.131 mol), N2 is the final number of moles (2.04 g/98 g/mol = 0.0208 mol), t1 is the initial time (0 min) and t2 is the final time (23.0 min).

Plugging the values into the equation, we get:

k = -ln(0.0208/0.131)/(23.0-0) = -ln(0.0208/0.131)/23.0 = 0.0803 min-1

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Answer:

volcanos erupting under water

Explanation:

when lava and water connects, it hardens like a stone called "magma". so when lava started shooting up it caused lots of magma to build up which made a surface

The pH of this solution of cobalt(II) hydroxide is likely to be basic. When cobalt(II) hydroxide dissolves in water, it hydrolyzes to produce cobalt(II) ions and hydroxide ions. As a result, the concentration of hydroxide ions increases, resulting in a basic solution.

Cobalt(II) hydroxide, on the other hand, is a base. When it dissolves in water, the OH- ion concentration increases, resulting in a basic pH. This is because hydroxide ions act as a proton acceptor and bind with protons, reducing their concentration. The pH of the solution of cobalt(II) hydroxide can be calculated by subtracting the logarithm of the hydroxide ion concentration from 14.

The pH of the solution will be greater than 7 if the concentration of hydroxide ions is greater than that of H+ ions (which is equivalent to having a pOH greater than 7).

In conclusion, the pH of a solution of cobalt(II) hydroxide is expected to be basic. The solution will have a pH greater than 7, since hydroxide ions increase the concentration of OH- ions, which are basic.

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The equilibrium constant, K, is a value that indicates the extent to which a reaction will proceed towards products at equilibrium.

If the value of K is greater than 1, it means that the products are favored at equilibrium, indicating that the reaction will proceed more towards products. On the other hand, if the value of K is less than 1, it means that the reactants are favored at equilibrium, indicating that the reaction will proceed more towards reactants.
To determine whether the value of K is greater than 1 or less than 1 for a specific reaction, we need to look at the balanced chemical equation for the reaction and calculate the equilibrium constant using the concentrations or pressures of the reactants and products at equilibrium. Without knowing the specific reaction, we cannot provide a definitive answer.

To determine if the value of the equilibrium constant, K, for the reaction is greater than 1 or less than 1, you need to consider the relationship between the concentrations of products and reactants at equilibrium. The equilibrium constant, K, is defined as the ratio of the concentrations of products to the concentrations of reactants, raised to the power of their respective stoichiometric coefficients.
If K > 1, it indicates that the concentration of products is greater than the concentration of reactants at equilibrium, meaning the reaction favors the formation of products.
If K < 1, it indicates that the concentration of reactants is greater than the concentration of products at equilibrium, meaning the reaction favors the formation of reactants.
In order to justify the value of K for the given reaction, you would need the equilibrium concentrations of the products and reactants or other information that allows you to determine the ratio of product concentrations to reactant concentrations at equilibrium.

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La respuesta correcta para esta pregunta abierta es la siguiente.

Estas son las oraciones apropiadas.

El carbón, el petróleo, y el gas natural son recursos naturales no renovables.

Estos generadores naturales de energía son considerados combustibles  fósiles que produce la mayor parte de hidrocarburos que se usan en el mundo. Sin embargo, estas reservas energéticas se están agotando porque son recursos naturales no renovables. Además, estos combustibles son altos generadores de contaminación como es el caso de las mareas negras.

Independientemente de estas ideas, es apropiado decir que los combustibles fósiles han sido fuertemente cuestionados por los ambientalistas y los científicos porque son causantes del llamado calentamiento global y del cambio climático.

Por esa razón, la sociedad y los expertos ambientalistas están pidiendo que los gobiernos comiencen a utilizar más energías alternativas y renovables como la energía solar y las turbinas de viento o energía eólica.

Answer 1:

a variable whose value depends on that of another

Example 1:

In a study to determine whether how long a student sleeps affects test scores, the independent variable is the length of time spent sleeping while the dependent variable is the test score.

Answer 2:

a variable whose variation does not depend on that of another.

Example 2:

The dependent variable is the variable that is being measured or tested in an experiment. For example, in a study looking at how tutoring impacts test scores, the dependent variable would be the participants' test scores, since that is what is being measured.

Independent Variable is a variable (often denoted by x) whose variation does not depend on that of another.

Example: A scientist is testing the effect of light and dark on the behavior of moths by turning a light on and off. The independent variable is the amount of light

Dependent Variable is a variable (often denoted by y) whose value depends on that of another.

Example: A scientist is testing the effect of light and dark on the behavior of moths by turning a light on and off. The moth's reaction is the dependent variable.

The mass of 22.4 L of gas at STP is calculated by the moles multiplied by the molar mass. and is equal to the molar mass of the gas.

According to the ideal gas equation , the expression is given as :

P V = n R T

n = P V / R T

pressure P is 1 atm

The volume V is 22.4 L

the gas constant R is 0.0823 at L / mol K

the temperature is 273 K

so, the number of moles at STP is given as :

n = P V / R T

n = ( 1 × 22.4 ) / ( 0.0823 × 273 )

n = 1 mole

the number of moles is given as :

moles = mass / molar mass

mass = moles × molar mass

mass = 1 mol × molar mass in g /mol

mass = molar mass in g /mol

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Answer:

-205.7kj

Explanation:

Now adding reaction 2 and twice of reaction 3 and reverse of reaction 1, we get the enthalpy of the reaction.

The expression for enthalpy for the following reaction will be,

where,

n = number of moles

Now put all the given values in the above expression, we get:

Therefore, the enthalpy of the following reaction is,  -205.7kj

Answer:

The density of ozone is 4.24.

Explanation:

The relation between the relative rate of diffusion and density is given by :

\(r\propto \dfrac{1}{\sqrt d}\)

The given ratio of the relative rate of diffusion of ozone as compared to chlorine is 6:3.

Let the density of ozone is d₂.

\(\dfrac{r_1}{r_2}=\sqrt{\dfrac{d_2}{d_1}} \\\\\dfrac{6}{3}=\sqrt{\dfrac{d_2}{36}} \\\\3=\dfrac{\sqrt{d_2}}{6}\\\\d_2=\sqrt{18} \\\\d_2=4.24\)

So, the density of ozone is 4.24.

The two stereoisomers formed from this reaction are the cis-isomer and the trans-isomer.

In the reaction scheme, a five-vertex line-angle ring, with a CH2 group double-bonded to the first vertex and a CH3 group bonded to the second (clockwise) vertex by a wedge, reacts with H2 in the presence of palladium on carbon. The single bond is active by default. The two stereoisomers formed from this reaction are the cis-isomer and the trans-isomer.

The cis-isomer can be drawn on the canvas by selecting the dashed button and clicking a bond on the canvas, while the trans-isomer can be drawn on the canvas by selecting the wedged button and clicking a bond on the canvas.

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a. To calculate the pH of the solution, we need to first calculate the concentration of H+ ions. Since HNO3 completely ionizes in water, the concentration of H+ ions will be equal to the concentration of HNO3.

Concentration of HNO3 = 25 mg/L / (63.01 g/mol) = 0.000397 M

Concentration of H+ ions = 0.000397 M

pH = -log[H+] = -log(0.000397) = 3.40

Therefore, the pH of the solution is 3.40.

b. To calculate the nitrate concentration, we simply need to convert the concentration of HNO3 to the concentration of NO3- ions.

Concentration of NO3- ions = 0.000397 M = 0.000397 mol/L * (62.004 g/mol) = 24.6 mg/L

Concentration of NO3- ions = 0.000397 M = 0.397 mM

Therefore, the nitrate concentration is 24.6 mg/L and 0.397 mM.

c. To calculate the nitrate-nitrogen concentration, we need to consider only the nitrogen part of the nitrate ion. The molecular weight of nitrogen is 14.007 g/mol.

Concentration of NO3-N = 0.000397 mol/L * (14.007 g/mol) = 5.56 mg/L

Concentration of NO3-N = 0.000397 M * (14.007 g/mol) / (14.007 g/mol) = 0.397 mM

Therefore, the nitrate-nitrogen concentration is 5.56 mg/L and 0.397 mM.

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You can determine which is which by weighting them

Copper usually weighs heavier than iron, so if you weigh them both on the scale, the heavier one would be the copper cube

Hope this helped!

The change represents oxidation or reduction are :

The removal of hydrogen is oxidation and increases in oxidation number is called as the oxidation reaction. the oxidations are given as :

The removal of oxygen is called as reduction and the decrease in oxidation number is called as the reduction. the reductions are given as follows :

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There are several methods to represent the concentration of a solution. Molarity, molality, mole fraction, etc. are some examples. Here the concentration of potassium ion in the mixture is 0.0475 M.

The concentration of a substance can be defined as the quantity of the solute present in a given amount of solution. The composition of a solution can be explained by calculating the concentration.

Here the concentration of potassium ions is:

Total amount of potassium ions / Total volume = 3.0 + 0.80 / 20.0 + 12.0 + 48.0 =  0.0475 M

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According to the information we can infer that the four groups of 3 atoms consist of 1 nitrogen atom (blue) between 2 oxygen atoms (red).

Based on the given information, the red atoms represent oxygen, while the blue atoms represent nitrogen. Each group consists of 3 atoms, with 1 blue atom (nitrogen) situated between 2 red atoms (oxygen). Therefore, the arrangement can be described as 1 nitrogen atom (blue) between 2 oxygen atoms (red) in each group.

Additionally we can conclude that the compound formed by two oxygen atoms and one nitrogen atom is called nitrogen dioxide (NO2).

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Answer:

The volume of container is 39.14 L.

Explanation:

Given data:

Number of moles of neon = 4.0 mol

Pressure of gas = 2.5 atm

Temperature of gas = 25°C

Volume of container = ?

Solution:

we will use general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

Now we will put the values in formula.

2.5 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K ×  298 K

V = 97.86 atm.L /2.5 atm

V = 39.14 L

The volume of container is 39.14 L.

Answer:

Explanation:

V1= 600.0 mL

T1= 293 K

V2 unknown

T2= 333K

Charles law V1*T2=V2*T1

where V1 and T1 are the initial volume and temperature. V2 and T2 are the final temperature and volume.

V2=(V1*T2)/T1 = ( 600.0*333)/293= 682 mL (with significant figures)(681.911 mL before signifcant figures.)

Based on the rate law, the equivalent expression to d[NO₂]/dt is -2k[O₃][NO₂]; option B.

A rate law gives a mathematical explanation of how variations in a substance's amount affect the rate of a chemical reaction.

To determine the equivalent expression to d[NO₂]/dt, differentiate the rate law with respect to [NO₂].

d/dt[k[O₃][NO₂]] = k[d[O₃]/dt][NO₂] + k[O₃][d[NO₂]/dt]

We assume d[O₃]/dt is a constant = k1 (since it is not given in the rate law)

The coefficient for NO₂ is -2,

Substituting in the equation above:

d[NO₂]/dt = (-2k/k1)[O₃][NO₂]

d[NO₂]/dt = -2k[O₃][NO₂]/k1

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