What is the ratio by mass of oxygen to carbon when 32 g of oxygen combine with 12 g of carbon?

Final answer:

The concentration of the original HBr stock solution can be calculated using the dilution equation by accounting for the serial dilution process and the given data on the final concentration and dilution volumes.

Explanation:

To determine the concentration of the original HBr stock solution when five standard solutions are prepared by serial dilution, we use the dilution equation C1V1 = C2V2, where C1 is the concentration of the stock solution, V1 is the volume taken from the stock solution, C2 is the concentration of the diluted solution, and V2 is the volume of the diluted solution. In this case, the final concentration C2 is given as 2.77 × 10−6 M, and each dilution involves diluting a 10.00 mL aliquot to 150.00 mL. Because there are five dilutions, the total dilution factor is (150.00/10.00)5. To find the original concentration C1, we rearrange the dilution equation to C1 = C2 × (V2/V1)n, where n is the number of dilutions, which is 5.you do the opposite operations. 3.17E-6 M (150.0 mL / 10.00 mL) = 4.76E-5 M (150.0 mL / 10.00 mL) = 7.13E-4 M (150.0 mL / 10.00 mL) = 1.07E-2 M (150.0 mL / 10.00 mL) = 0.160 M So the original stock was a 0.160 M HBr solution.

The approximate lifespan of the person is 96.79 years based on a heartbeat of 61 beats per minute and 3.1e9 total heartbeats in a lifetime.

To calculate the number of years a person lives based on their heartbeat, we can divide the total number of heartbeats in a lifetime by the number of heartbeats per minute. First, let's convert 3.1e9 to standard notation: 3,100,000,000. Then, we divide this number by 61 to find the number of minutes it takes for the person's heart to beat 3.1e9 times. Dividing 3,100,000,000 by 61 gives us approximately 50,819,672.13 minutes. We can then divide this number by the number of minutes in a year (525,600) to find the approximate number of years the person lives. 50,819,672.13 minutes divided by 525,600 gives us approximately 96.79 years.

The answer B. solute; solvent

Tools help artists understand different elements of art. A pencil or liner can aid understanding of 'line', drawing tools help understand 'shape'. Coloring tools like paint and brushes assist with the 'color' element, and any drawing or painting tool can aid understanding of 'space'.

Without specifying the tool, it's difficult to say definitively which element of art it would help an artist understand. However, broadly speaking, different tools help to understand different elements. For instance:

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Plasma is the most energetic state of matter and primarily consists of ionized gases. Natural examples of plasma include stars like the Sun and phenomena like lightning, which ionize gases due to their high temperature and energy.

The question asks for an example of a plasma that occurs in nature. Plasma is the most energetic state of matter and is characterized by ionized gases made up of negatively charged free electrons and positively charged ions. In nature, stars such as the Sun are perfect examples of this. Stars, including the Sun, are so hot that the material they are composed of exists in the form of an ionized gas, or plasma. All particles in this state are rapidly in motion, continuously colliding with each other, leading to the pressure of the gas.

Not only stars, but certain weather phenomena such as lightning also contain plasma. The lightning's heat ionizes the gases in the atmosphere, leading to a plasma state. Therefore, the Sun and lightning are examples of plasma occurring naturally in the universe.

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Answer: The correct answer is Option B.

Explanation:

There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.

Any neutral atom has equal number of protons and electrons.

Hence, the correct answer is Option B.

The variables in the experiment are controlled, independent, and dependent. In baking the cake the temperature is independent, and the time to bake is the dependent variable. Thus, option D is correct.

An independent variable is a value or a parameter that can be manipulated and altered to analyze its effect on the experiment and its constituents. They do not get influenced by other variables.

The temperature of the oven is the independent variable as it determines the rate at which the cake gets baked. It affects the dependent variable like the time required for the cake to get baked.

An independent variable is a cause that varies the dependent variable and its effect. It is not a constant value and hence gets changed according to the need.

Therefore, option. D. temperature of the oven is an independent variable.

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Your question is incomplete, but most probably your full question was, The higher the temperature of the air in the oven, the faster a cake will bake. Identify the independent variable.

A. Time needed to bake the cake

B. Type of oven

C. Cake flavor

D. Oven temperature

Answer:

Speed equals distance over time.

Explanation:

Speed of an object is equal to the total distance covered divided by total time taken. The mathematical formula for speed of an object is given by :

[tex]v=\dfrac{d}{t}[/tex]

d = distance covered

t = time taken

Speed of an object is a scalar quantity. Its SI unit is m/s or meters per second. So, the correct option is (c) "Speed equals distance over time".

According to the Bohr model of the atom, which was developed by Niels Bohr in 1913, the shortest wavelength line in the visible emission spectrum for hydrogen corresponds to an electron transition from a higher energy level to the second energy level (n = 2).

In other words, it involves an electron moving from an outer orbit to the second innermost orbit.

This transition is responsible for the emission of visible light, specifically the violet or deep blue region of the spectrum. When an electron falls from a higher energy level to the second energy level, it releases energy in the form of a photon with a higher energy, hence a shorter wavelength. The energy difference between the two energy levels determines the frequency and thus the wavelength of the emitted light, with shorter transitions resulting in shorter wavelengths.

This fundamental insight provided by the Bohr model was a significant step in understanding the quantized nature of atomic spectra and laid the foundation for modern quantum mechanics and our understanding of the behavior of electrons in atoms.

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Final answer:

According to the Bohr model of the atom, the electron transition that would correspond to the shortest wavelength line in the visible emission spectra for hydrogen is from the higher-energy orbit (n=3) to the second orbit (n=2).

Explanation:

According to the Bohr model of the atom, the electron transition that would correspond to the shortest wavelength line in the visible emission spectra for hydrogen is from the higher-energy orbit (n=3) to the second orbit (n=2). This transition produces a line with a wavelength of 656 nanometers, which appears as red light. The first line in the Lyman series, which lies in the ultraviolet part of the spectrum, corresponds to a transition from the ground state (n=1) to the second orbit (n=2).

As the air is heated the kinetic energy of particles increases rendering it less dense.

Kinetic energy is a type of energy possessed by the particles when they are in motion.Heating causes temperature to rise and as a result of which kinetic energy increases.Temperature and density are inversely proportional while temperature and kinetic energy are directly proportional.

As the temperature increases, kinetic energy increases and density decreases.Considering all these factors , air when heated up it's density decreases  as the particles will move faster with increase in temperature, as heat is inversely proportional to density.

This type of phenomenon can be observed in deserts where the air is hot due to an increase in temperature.

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Las leyes de Newton, formuladas por Isaac Newton, se refieren a tres leyes fundamentales que describen cómo los objetos se mueven en respuesta a las fuerzas. Estas incluyen la ley de inercia, la ley de fuerza y aceleración, y la ley de acción y reacción.

Isaac Newton introdujo tres leyes fundamentales que rigen el movimiento de todos los objetos, conocidas como las leyes de Newton. Estas leyes sentaron las bases para la mecánica clásica y son cruciales en el estudio de la dinámica y la física en general.

Primera Ley de Newton o Ley de Inercia:

Establece que un objeto permanecerá en su estado de movimiento, ya sea en reposo o moviéndose con velocidad constante, a menos que una fuerza externa neta actúe sobre él.

Segunda Ley de Newton o Ley de Fuerza y Aceleración:

La aceleración de un objeto es proporcional a la fuerza neta ejercida sobre el objeto, inversamente proporcional a su masa, y en la misma dirección que la fuerza neta aplicada.

Tercera Ley de Newton o Ley de Accion y Reaccion:

Cuando un objeto ejerce una fuerza sobre otro, el segundo objeto ejerce una fuerza sobre el primero que es igual en magnitud y opuesta en dirección. Las acciones mutuas de dos cuerpos siempre son iguales y dirigidas en sentidos opuestos.

Answer: B. A. D. D. B. B

Some kids do drop out and do drugs.

From the given occasions, acceptance of anything does not involve grief. The statement regarding teens is true. During teen year, self esteem may increase or decrease. Happiness and sadness and fear are primary emotions.

Emotion is a person's feelings expressed in a situation. It may happiness, sad, fear, angry etc. The emotion of a person depends upon the occasion and metal health of the person.

Among the given situations a in which greif is absent is acceptance. Thus option C is correct. Teens with low esteem have a chance to addict drugs. Hence, the statement is true.

During teens year, self esteem changes rapidly. Thus option D is correct. A need which is not the hierarchy is belonging. The primary emotions  include happiness, sad and fear whereas, angry, excitement etc are secondary emotions.

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Propane is C3H8

So Molar mass propane = 3*12 + 8*1 = 44 
No. of moles of propane = 167/44 = 3.795 moles

Final answer:

To find the number of moles of hydrogen gas from the given 5.080 \u00d7 1016 molecules, divide by Avogadro's number, resulting in 0.0843 moles of hydrogen gas.

Explanation:

To convert the number of molecules to moles, we use Avogadro's number (6.022 \u00d7 1023 molecules/mol). Given the student has 5.080 \u00d7 1016 molecules of hydrogen gas (H2), we set up a conversion factor to cancel out the units of molecules and leave the units of moles.

The calculation to determine the number of moles from the given number of molecules is:

(5.080 \u00d7 1016 molecules H2) \u00d7 (1 mol H2 / 6.022 \u00d7 1023 molecules H2) = 0.0843 moles H2

This shows that the student has 0.0843 moles of hydrogen gas.