How can the shape of a molecule determine its polarity.

Answer: Molar masses 40.8 and 100.1

Explanation:

Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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Answer:

invalid

Explanation:

Just imagine doing this experiment MULTIPLE TIMES and one of the trials you get 72 Kcal while in another u get 12kcal. It doesn't make sense. Somewhere in the experiment she went wrong. So its invalid

Answer:

To understand this first we must understand what is happening at the molecular level. When we heat any substance it changes its state of matter because its molecules get excited. For example, when we heat water it turns into gas so the molecules get excited. The hot air balloon will move faster if we add heat because the gas molecules will get excited and push against the balloon, making it faster. If we start removing heat, the balloon's acceleration will slow down because the molecules will get less excited.

Hot air balloons flies by means of it being lighter than air

The flame can be used to move the pilot to different directions by increasing the temperature of the air in the balloon and therefore, the volume, therefore, decreasing the density of the air which changes the elevation of the balloon to the appropriate elevation having winds moving in the desired direction

The principle by which the above process works is as follows:

According to Charles law, the volume of a mass of gas is directly proportional to its Kelvin temperature

V ∝ T

\(\dfrac{V_1}{T_1} = \dfrac{V_2}{T_2}\)

\(V_2 = T_2 \times \dfrac{V_1}{T_1}\)

\(Density, \rho = \dfrac{Mass, \ m}{Volume, \ V}\)

Therefore, as the temperature is increased, the volume occupied the mass gas increases, and therefore, the density decreases

The principle on which the hot air balloon operates on is the principle that hot air is less dense than and therefore, rises above cool air

Therefore, the pilot of an hot air balloon heats up the air in the balloon to allow the balloon to rise and the pilot switches off the burner so that the air in the balloon cools and the balloon looses altitude

The mechanism of the hot air balloon does not have a steering, and therefore, the wind direction is used to steer the balloon

The direction of the wind is different at different altitude, such that by obtaining the direction of the wind at a given altitude, the pilot can raise or lower the balloon up or down to the altitude having the desired wind direction, by increasing the temperature of the air in the balloon by switching on the burner to go to a higher altitude, or by switching off the burner so the air in the balloon cools and the balloon loses some of its altitude to reach the wind going in the direction of the pilot

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The molar mass of calcium carbonate (CaCO₃) is approximately 100.09 g/mol. The gram is commonly used to measure the mass of small objects, such as food items, coins, and jewelry.

A gram is a unit of mass in the metric system, abbreviated as  It is defined as one-thousandth of a kilogram, which is the base unit of mass in the International System of Units (SI).

It is also used in scientific measurements, such as in chemistry and physics, to express the mass of atoms, molecules, and other particles.

To calculate the mass of 9.50 moles of calcium carbonate, we can use the following formula:

mass = moles x molar mass

Substituting the given values, we get:

mass = 9.50 moles x 100.09 g/mol

mass = 950.45 g

Therefore, 9.50 moles of calcium carbonate would have a mass of approximately 950.45 grams.

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Answer:

I think what goes in the blank is (sources)

Explanation:

sounds are produced by sources which vibrate.

The type of diversity that refers to differences in observable attributes or characteristics is called surface-level diversity.

Surface-level diversity encompasses the visible or easily observable attributes of individuals, such as age, gender, race, physical abilities, and appearance. These attributes are readily noticeable and do not require deep knowledge or understanding of an individual.

Surface-level diversity provides a basic understanding of the differences that exist among individuals within a group or organization. However, it is important to note that surface-level diversity only scratches the surface and does not capture the complexity of individuals' experiences, perspectives, and values.

It is necessary to go beyond surface-level diversity and also consider deeper dimensions such as deep-level diversity, which encompasses differences in beliefs, values, and experiences that are not readily observable.

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Answer

Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction. After the reaction, the vessel will have a mass equal to the initial 245 g.

Explanation

The Law of Conservation of Mass states that the mass is neither created nor destroyed in chemical reactions. This means the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Based on the previous we can say that: The law of conservation of the mass states that the total mass will always stay the same during a chemical reaction.

After the reaction, the vessel will have a mass equal to the initial 245 g.

Answer: The information about sequential order of the event occurred in the past can be obtained by using only relative dating method.

Explanation:

Relative dating method doesn’t give information about when it happened. It provides sequential order of the events. It is the art of deciding the overall happening of past occasions (i.e., the age of an item in contrast with another), without fundamentally deciding their outright age (for example evaluated age).

In topography, shake or shallow stores, fossils and lithologies can be utilized to correspond one stratigraphic segment with another.

Using this formula, we can calculate the confidence interval once we have the sample data, without the sample data, it is not possible to provide an accurate confidence interval estimate.

To construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system, we would need the sample data, specifically the number of cell phone users and the number of users who developed cancer. Without the sample data, it is not possible to provide an accurate confidence interval estimate.

However, if we assume that we have the necessary sample data, we can proceed with the calculation. The formula for calculating a confidence interval for a proportion is:

Confidence interval

\(=�^±�×�^(1−�^)�Confidence interval= p^​ ±z× np^​ (1− p^​ )​ ​ where:�^p^​\)

 is the sample proportion (number of users with cancer divided by the total number of cell phone users).

\(�\)

z is the z-score corresponding to the desired confidence level (90% confidence level corresponds to a z-score of approximately 1.645).

\(�\)

n is the sample size (total number of cell phone users).

Using this formula, we can calculate the confidence interval once we have the sample data.

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Answer:

so i think physical change

Explanation:

\(CO _{2} \: and \: H _{2} O\)

Reactants must be on the left hand side of the reaction

Answer:

d

Explanation:

because i took the test

Answer:

D

Explanation: took test and it was right

answer and explanation

to correctly answer this question we first need to look at the mol ratio of the balanced stoichiometric equation

H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O

from this balanced equation we see that 2 mols of NaOH will be neutralized by 1 mol of sulfuric acid. therefore the mols ratio is

H₂SO₄: NaOH

1:2

if we have 0.70 mol of NaOH then we need :

(0.70 x1)/2 = 0.35 mols of sulfuric acid

Answer:

Rate will double

Explanation:

Since the concentration of A is doubling the rate of reaction will also double, since in this scenario concentration is proportional to rate of reaction. So if the concentration of A were to triple the rate of reaction would also triple.

We can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction

What is Percentage Yield?

It compares the actual yield of a reaction to the theoretical yield that would be obtained if the reaction proceeded perfectly, and expresses the result as a percentage.

To calculate the percentage yield for SiO₂ in Trial 1, we first need to determine the theoretical yield. We can do this by using stoichiometry and the amount of SiCl₄, which is the limiting reactant:

1 mole SiCl₄ reacts with 1 mole O₂ to produce 1 mole SiO₂ and 1 mole Cl₂

The molar mass of SiCl₄ is 169.9 g/mol, so 100 g of SiCl₄ is equivalent to 100/169.9 = 0.588 moles.

Since 32.96 g of O₂ was used, which has a molar mass of 32 g/mol, this is equivalent to 32.96/32 = 1.03 moles of O₂.

Since oxygen is the excess reactant, we can use the amount of SiCl₄ to calculate the theoretical yield of SiO₂:

0.588 moles SiCl₄ × 1 mole SiO₂/1 mole SiCl₄ × 60.1 g SiO₂/1 mole SiO₂ = 35.8 g SiO₂

The actual yield of SiO₂ in Trial 1 was 50 g. Therefore, the percentage yield is:

(50 g SiO₂/35.8 g SiO₂) × 100% = 139.7%

This indicates that the experiment produced more SiO₂ than was theoretically predicted. There are a number of possible reasons for this, such as experimental error or the presence of impurities in the reactants.

To determine the leftover reactant, we can use stoichiometry and the amount of SiCl₄ that was used:

0.588 moles SiCl₄ - 0.5 moles SiO₂ produced = 0.088 moles SiCl₄ remaining

The leftover reactant is equivalent to:

0.088 moles SiCl₄ × 169.9 g SiCl₄/1 mole SiCl₄ = 15 g SiCl₄

Therefore, 15 g of SiCl₄ was leftover in Trial 1.

b. We can use the percentage yield from Trial 2 to determine which ratio of reactants is more efficient. Since the amount of SiCl₄ was kept constant, the change in the yield must be due to the change in the amount of O₂. To compare the efficiency of different ratios, we can calculate the theoretical yield for each trial and compare it to the actual yield:

Trial 1: Theoretical yield of SiO₂ = 35.8 g, actual yield = 50 g, percentage yield = 139.7%

Trial 2: Theoretical yield of SiO₂ = 107.4 g, actual yield = 60 g, percentage yield = 55.8%

From these results, we can see that Trial 1 was more efficient than Trial 2, since it had a higher percentage yield. This suggests that using a smaller amount of oxygen relative to SiCl₄ is more efficient for this reaction.

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Answer:

I'm not understand that question

I'm so sorry

The pressure after the addition of argon is 4.33 atm.

To solve this problem, we can use the ideal gas law:

\(PV = nRT\)

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, let's find the number of moles of argon that are pumped into the container. We can use the ideal gas law to solve for n:

\(n = PV/RT\)

We are given that the initial volume and pressure of the argon are \(2.00 L and 6.77 atm\), respectively. We also know that the temperature is constant. The gas constant R is a constant value, so we can write:

\(n = (6.77 atm) x (2.00 L) / (R x T)\)

Next, let's find the total number of moles of gas in the container. We know that the container already holds 3.01 atm of neon, so we can use the ideal gas law to find the number of moles of neon:

\(n_Ne = PV / RT = (3.01 atm) x (4.66 L) / (R x T)\)

The total number of moles of gas in the container is then:

\(n_total = n_Ar + n_Ne\)

where n_Ar is the number of moles of argon that were pumped into the container.

The total pressure in the container is given by:

\(P_total = (n_total x R x T) / V_total\)

where V_total is the total volume of the container, which is the sum of the initial volume and the volume of the argon that was pumped in:

\(V_total = V_Ar + V_Ne = 2.00 L + 4.66 L = 6.66 L\)

Substituting in our values, we get:

\(P_total = [(n_Ar + n_Ne) x R x T] / V_total\)

We can now solve for the pressure after the addition of the argon by setting the total pressure equal to the pressure of the neon before the addition plus the pressure of the argon after the addition:

\(P_total = P_Ne_before + P_Ar_after\)

We know that the pressure of the neon before the addition is 3.01 atm. Substituting in our values and solving for P_Ar_after, we get:

\(P_Ar_after = P_total - P_Ne_before\)

\(P_Ar_after = [(n_Ar + n_Ne) x R x T] / V_total - P_Ne_before\)

Plugging in the values, we get:

\(P_Ar_after = [(6.77 atm x 2.00 L) / (R x T)] + [(3.01 atm x 4.66 L) / (R x T)] - 3.01 atm\)

Simplifying the expression, we get:

\(P_Ar_after = [(6.77 x 2.00) / 6.66 + (3.01 x 4.66) / 6.66] - 3.01\)

\(P_Ar_after = 4.33 atm\)

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The volume of blood in the rat is 0.0096 mL. This calculation assumes that the nuclide is long-lived and no significant decay occurs in the timeline of the experiment, as well as that the total activity is only distributed in the blood of the rat.

Decay is the process of breaking down or decomposing due to age, the environment, or other factors. In biology, it is the breakdown of organic material caused by bacteria, fungi, and other organisms. In physics, it is the process of radiation and particle emission from unstable particles.

The volume of blood in the rat can be calculated using the following equation:
Volume of Blood (Vb) = Activity in Blood (Ab) / Activity in Solution (As) * Volume of Solution (Vs)
Vb = (48 cpm/mL) / (5.0 x 103 cpm/mL) * (0.10 mL)
Vb = 0.0096 mL
Therefore, the volume of blood in the rat is 0.0096 mL. This calculation assumes that the nuclide is long-lived and no significant decay occurs in the timeline of the experiment, as well as that the total activity is only distributed in the blood of the rat.

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The dominant mechanism for the removal of carbon dioxide from the atmosphere is the process of photosynthesis in plants. During this process, carbon dioxide is absorbed by plants and converted into organic matter, which is then used for plant growth and development. This mechanism is important because it not only removes carbon dioxide from the atmosphere but also produces oxygen, which is essential for the survival of many living organisms.

Although photosynthesis is the primary mechanism for the removal of carbon dioxide from the atmosphere, other processes also play a role. One such process is the dissolution of carbon dioxide in seawater, which can result in the formation of carbonate ions. These carbonate ions can then react with calcium ions in seawater to form calcium carbonate, which can eventually settle on the seafloor and form carbonate-rich rocks.

Subduction, on the other hand, is a process by which one tectonic plate is forced beneath another. This process does not directly remove carbon dioxide from the atmosphere, but it can contribute to the removal of carbon dioxide over long periods of time. When tectonic plates are forced beneath one another, they can carry carbon-rich sediments with them, which can then be subjected to high temperatures and pressures, causing them to release carbon dioxide into the atmosphere.

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Answer:

It is the third option.

Explanation:

Codominance is when both traits can be seen.

Answer:

The correct answer is b) 4.17 g of sodium and 6.42 g of chlorine

Explanation:

According to the law of definite proportions a chemical compound is composed always by the same elements in the same proportions by mass. In this case, the proportion of the elements by mass will be 4.37 g of chlorine (Cl) per 2.84 g of sodium (Na):

4.37 Cl/2.84 g Na= 1.54

We can calculate the proportions of the results in order to see which is the correct:

a) 3.75 g Cl/4.17 g Na = 0.899

b) 6.42 g Cl/4.17 g Na = 1.539 ⇒ ≅1.54

c) 1.05 g Cl/4.17 g Na = 3.971

d) 12.1 g Cl/4.17 g Na = 2.901

The option in which the proportion Cl/Na is equal to 1.54 is option b

The observation that the equilibrium shifted to the right and the reverse reaction decreased suggests that the increase in stress favored the forward reaction, resulting in an increase in the concentration of products.

The addition of stress to a chemical reaction can cause the equilibrium to shift in order to relieve the stress. In this case, the stress caused the equilibrium to shift to the right, favoring the forward reaction and increasing the concentration of products. Of the options given, the addition of CO would increase the concentration of products and therefore could cause the equilibrium to shift to the right. The addition of As4 would increase the concentration of reactants, which would have the opposite effect. The removal of As4O6 would decrease the concentration of reactants, also causing the equilibrium to shift to the right.

Overall, the addition of CO or the removal of As4O6 would have caused the observed shift in equilibrium to the right.

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Answer:

The molar concentration of NaOH in the final diluted solution is 0.056 M

Explanation:

To calculate the number of millimoles of phenyl bromide present, we need to first convert the given quantity of phenyl bromide (1.4555 g) into moles by dividing it by its molar mass.

The molar mass of phenyl bromide is the sum of the molar masses of its constituent atoms, which is 157.01 g/mol.

Therefore, the number of moles of phenyl bromide present is:

1.4555 g / 157.01 g/mol = 0.0092711 mol

To convert this into millimoles, we need to multiply it by 1000:

0.0092711 mol x 1000 = 9.2711 mmol

Therefore, there are 9.2711 millimoles of phenyl bromide present in the Grignard reaction. It is important to accurately measure the amount of reactants involved in a reaction to determine the stoichiometry and yield of the reaction.

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Answer:

20.62 L

Explanation:

Ideal gas law    PV = n RT     R = .082057 L-atm/mol-k

  (T must be in K units)

1.4  * V  = 1.2  * .082057 * (273.15 + 20) = 20.62 L

Answer:

A. teeth

Explanation:

It contains a protien called collagen, which absorbs chemical elements from the food that an individual eats, so scientists are able to obtain information about animals diet by studying the chemical elements found in fossilised teeth.

Answer:

Teeth

Explanation:

They can see the shape of the teeth and try to figure out what they ate

Answer:

Is D

Explanation:

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