The explosion of a star releases billions of _______ into the atmosphere.

Explanation:

the last CH2 should CH3

because the first and last carbons are bonded to three hydrogens

Answer:

C.164.1g/mol

Explanation:

40+14×2+16×6

164

The molar mass of Ca(NO3)2 is 164.1 g/mol.

Calcium nitrate, also called Norgessalpeter (Norwegian salpeter), is an inorganic compound with the formula Ca(NO3)2(H2O)x. The anhydrous compound, which is rarely encountered, absorbs moisture from the air to give the tetrahydrate. Both anhydrous and hydrated forms are colourless salts. Calcium nitrate is mainly used as a component in fertilizers, but it has other applications. Nitrocalcite is the name for a mineral which is a hydrated calcium nitrate that forms as an efflorescence where manure contacts concrete or limestone in a dry environment as in stables or caverns. A variety of related salts are known including calcium ammonium nitrate decahydrate and calcium potassium nitrate decahydrate.

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Explanation:

To solve the problem, we can use the freezing point depression equation:

ΔT = Kf · molality

where ΔT is the change in freezing point, Kf is the freezing point depression constant, and molality is the concentration of the solution in moles of solute per kilogram of solvent.

In this case, we're looking for the freezing point of a solution of C5H4 in benzene, given that the freezing point of pure benzene is 5.50 °C, and the freezing point depression constant is 5.12 °C/m.

First, let's calculate the molality of the solution:

molality = moles of solute / kilograms of solvent

To find the moles of solute, we need to know the molar mass of C5H4. By looking it up in a periodic table, we find:

Molar mass of C5H4 = 64.09 g/mol

The problem doesn't tell us how much solute was added, but it does give us the concentration of the solution as 0.41 m (which means 0.41 moles of C5H4 per kilogram of benzene). Therefore:

molality = 0.41 moles / 0.998 kg ≈ 0.411 mol/kg

Now we can calculate the freezing point depression:

ΔT = Kf · molality

ΔT = 5.12 °C/m · 0.411 mol/kg ≈ 2.10 °C

The freezing point depression tells us how much the freezing point of the solution is lowered compared to the freezing point of pure benzene. Therefore, the freezing point of the solution is:

Freezing point = 5.50 °C - 2.10 °C = 3.40 °C

Therefore, the freezing point of the 0.41 m solution of C5H4 in benzene is 3.40 °C.

Answer:

•4x^2 = 16

•2(x - 2)^2 = 0

Explanation:

To solve this problem, we can simply substitute x = -2 and x = 2 into each of the given equations, and see which ones are true.

Let's start with x = -2:

x^2 - 4 = 0: (-2)^2 - 4 = 0, so this equation is not true for x = -2.

x^2 = -4: (-2)^2 = 4, which is not equal to -4, so this equation is not true for x = -2.

3x^2 + 12 = 0: 3(-2)^2 + 12 = 12, which is not equal to 0, so this equation is not true for x = -2.

4x^2 = 16: 4(-2)^2 = 16, so this equation is true for x = -2.

2(x - 2)^2 = 0: 2(-2 - 2)^2 = 0, so this equation is true for x = -2.

Now let's try x = 2:

x^2 - 4 = 0: 2^2 - 4 = 0, so this equation is not true for x = 2.

x^2 = -4: 2^2 = 4, which is not equal to -4, so this equation is not true for x = 2.

3x^2 + 12 = 0: 3(2)^2 + 12 = 36, which is not equal to 0, so this equation is not true for x = 2.

4x^2 = 16: 4(2)^2 = 16, so this equation is true for x = 2.

2(x - 2)^2 = 0: 2(2 - 2)^2 = 0, so this equation is true for x = 2.

Therefore, the two equations that are true for both x = -2 and x = 2 are:

4x^2 = 16

2(x - 2)^2 = 0

In summary, by substituting x = -2 and x = 2 into each equation and checking for equality, we found the two equations that are true for both values of x.

Answer:

yes

Explanation:

because I think it is correct fo u

Three types of end products produced during fermentation lactic acid, formic acid, acetic acid durham tube to detect gas produced by microorganisms

Fermentation reacts NADH with an endogenous and organic electron acceptor and common end products of bacterial fermentation include lactic acid, formic acid, acetic acid, butyric acid, butyl alcohol, acetone, ethyl alcohol, carbon dioxide, and hydrogen and fermentation reactions are detected by the color change of a pH indicator when durham tube are mainly used in microbiology to detect gas by microorganism and gas production helps to identify the type of organism and these special tubes are placed upside down in bigger test tubes to detect the presence of gas production

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Answer:

220g of CO2

Explanation:

Step 1:

The balanced equation for the reaction.

2C5H11OH + 15O2 —> 10CO2 + 12H2O

Step 2:

Determination of the number of mole of CO2 produced by burning 1 mole of C5H11OH.

From the balanced equation above,

2 moles of C5H11OH produced 10 moles CO2.

Therefore, 1 mole of C5H11OH will produce = (1 x 10)/2 = 5 moles of CO2.

Therefore, 5 moles of CO2 is produced from the reaction.

Step 3:

Conversion of 5 moles of CO2 to grams.

Molar mass of CO2 = 12 + (2x16) = 44g/mol

Number of mole of CO2 = 5 moles

Mass of CO2 =...?

Mass = mole x molar mass

Mass of CO2 = 5 x 44

Mass of CO2 = 220g.

Therefore, 220g of CO2 were obtained from the reaction.

The sentence that describes this chemical reaction: is that:

This chemical reaction is an example of a neutralization reaction, where an acid and a base react to form a salt and water. In this case, the acid is hydrogen gas (H₂) and the base is sodium hydroxide (NaOH). The reaction can be written as:

Na(s) + H₂O(l) --> NaOH(aq) + H₂(g)

where Na(s) represents solid sodium, H₂O(l) represents liquid water, NaOH(aq) represents aqueous (dissolved in water) sodium hydroxide and H₂(g) represents hydrogen gas.

Sodium (Na) is a metal and a strong base. It reacts with water to produce hydrogen gas and a solution of sodium hydroxide, which is a strong base. When sodium metal is added to water, it reacts by losing an electron and becoming a positively charged ion (Na+). At the same time, water molecules, H₂O, split into hydrogen ions (H+) and hydroxide ions (OH-).

Therefore, It is an exothermic reaction, meaning it releases heat. It can also be dangerous as hydrogen gas is flammable and can cause explosion if it comes in contact with an ignition source.

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In a typical reverse-phase LC procedure, decreasing the polarity of the mobile phase will most likely have the following effects on the peaks in the chromatogram: The tm for the system will decrease, and the retention times of the peaks will increase. Option E, and G are correct.

When the polarity of the mobile phase decreases, the overall polarity of the system decreases as well, and the non-polar compounds will have a stronger affinity for the non-polar stationary phase, resulting in a decrease in tm. The retention times of the peaks will increase because the non-polar compounds will spend more time interacting with the non-polar stationary phase.

The other options are incorrect because: The plate height of the peaks will decrease: This is not necessarily true and depends on several factors, such as column efficiency, flow rate, and injection volume.

The tm for the system will increase: This is the opposite of what happens when the polarity of the mobile phase decreases.

The retention factors for all non-polar compounds will increase: This is also the opposite of what happens when the polarity of the mobile phase decreases.

The resolution of the peaks will increase: This is not necessarily true and depends on the specific compounds being analyzed and the chromatographic conditions.

The efficiency of the peaks will increase: This is not necessarily true and depends on several factors, such as column efficiency, flow rate, and injection volume.

The retention times of the peaks will decrease: This is the opposite of what happens when the polarity of the mobile phase decreases.

Hence, E. G. The tm for the system will decrease, the retention times of the peaks will increase is the correct option.

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The frequency of a wave 2.8 x 10³ Hertz is then the wavelength of these gamma rays is 107 nm

Wavelength is the the distance between two successive crests or troughs of a wave

Here given data is

Frequency = 2.8 x 10³ Hertz

Velocity of gamma rays = 3×10⁸m/s

We have to calculate wavelength of these gamma rays?

So, wavelength = velocity/frequency

λ = v/f

λ = 3×10⁸m/s/2.8 x 10³ Hertz

λ = 107 nm

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Answer:

diffusion

Explanation:

plants have stomata at the bottom of their leaves. these allow for CO2 to diffuse in and out of the plant.

Therefore, the percent composition of each element in glucose is approximately:

Carbon: 40.0%

Hydrogen: 6.67%

Oxygen: 53.3%

What is Percentage Composition?

It is calculated by dividing the mass of each element in the compound by the total molar mass of the compound and multiplying by 100%.

To calculate the percent composition of each element in glucose (C6H12O6), we need to first determine the molar mass of the compound and then calculate the contribution of each element to that mass.

The molar mass of C6H12O6 can be calculated as follows:

6(12.01 g/mol C) + 12(1.01 g/mol H) + 6(16.00 g/mol O) = 180.18 g/mol

The contribution of each element to the molar mass is:

Carbon: 6(12.01 g/mol) / 180.18 g/mol = 0.400 or 40.0%

Hydrogen: 12(1.01 g/mol) / 180.18 g/mol = 0.067 or 6.67%

Oxygen: 6(16.00 g/mol) / 180.18 g/mol = 0.533 or 53.3%

Therefore, the percent composition of each element in glucose is approximately:

Carbon: 40.0%

Hydrogen: 6.67%

Oxygen: 53.3%

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Answer:

salt and oil

water and salt

water and sugar

Explanation:

The concentration of H⁺ in the resulting solution is 4.0757 M.

To calculate the concentration of H⁺ in the resulting solution, we can use the concept of molar concentration and the stoichiometry of the given acids.

Given:

Volume of HI (hydroiodic acid) = 0.5 L = 500 mL

Molarity of HI = 2.57 M

Volume of H₂SO₄ (sulfuric acid) = 284 mL

Molarity of H₂SO₄ = 2.78 M

First, we need to calculate the moles of H⁺ contributed by each acid:

Moles of H⁺ from HI = (Molarity of HI) × (Volume of HI in L) = 2.57 M × 0.5 L = 1.285 mol

Moles of H⁺ from H₂SO₄ = (Molarity of H₂SO₄) × (Volume of H₂SO₄ in L) = 2.78 M × 0.284 L = 0.79052 mol

Next, we sum up the moles of H⁺ from both acids:

Total moles of H⁺ = Moles of H⁺ from HI + Moles of H⁺ from H₂SO₄ = 1.285 mol + 0.79052 mol = 2.07552 mol

Finally, we calculate the concentration of H⁺ in the resulting solution:

Concentration of H⁺ = (Total moles of H⁺) / (Total volume of the resulting solution in L) = 2.07552 mol / (0.5 L + 0.284 L) = 4.0757 M

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Answer: 3.2

Explanation:

No, I would not consider using a 5mm electrode for vertical up-root runs in a 6g (hl045) fixed-position pipe.

This is because a 5mm electrode is too large for this type of welding, and can result in a lack of penetration and a weak weld. Instead, a smaller electrode, such as a 3.2mm or 2.5mm, would be a better choice for this application. These smaller electrodes allow for better control and penetration, resulting in a stronger weld. Additionally, it is important to use the correct welding technique and travel speed when performing vertical up-root runs in a 6g (hl045) fixed-position pipe to ensure a strong and secure weld.

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Option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

An ethogram can be best described as an inventory of the behavior of a particular species. It is a systematic catalog or list of behaviors exhibited by a specific animal species.

An ethogram provides a comprehensive overview of the behaviors displayed by the animals under study, documenting various activities, actions, and patterns of behavior.

While options 1 and 2 are related to visual representations or descriptions of behavior, they do not capture the comprehensive nature of an ethogram. Option 4 refers specifically to behaviors observed in response to an experimental intervention, which is more narrow in scope compared to an ethogram. Therefore, option 3 accurately represents the essence of an ethogram as an inventory of species-specific behaviors.

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Answer:

Chemical Changes are also called Chemical Reactions. Chemical reactions involve combining different substances. The chemical reaction produces a new substance with new and different physical and chemical properties. Matter is never destroyed or created in chemical reactions.

Explanation:

Arrhenius acid

An Arrhenius acid is a compound that increases the concentration of H+ ions that are present when added to water. These H+ ions form the hydronium ion (H3O+) when they combine with water molecules.

Answer:

it's volume also decrease

Bond order of N2+ is 2.5. It is a diamagnetic substance.

Bond order is termed as the number of chemical bonds between a pair of the atoms. For example: In case of acetylene the bond order between the two carbon atoms is 3, in diatomic nitrogen the bond order is 3, and the C-H bond order is 1.

The bond order of N2+ is 2.5.

Bond order = 1 / 2[Nb - Na] Where, Nb = no. of electrons in bonding molecular orbital and Na = number of electrons in antibonding molecular orbital.

Bond order = 9-4 / 2

= 2.5

N2+ is diamagnetic in nature because they do not have any unpaired electrons they are having 14 electrons.

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Answer:

m = 35.1 g

Explanation:

Molarity = number of moles ÷ volume (in litres)

M = n ÷ V

But n = mass ÷ Molar mass

=> M = m ÷ (MM × V)

=> m = M × MM × V

=> m = 1.5 M × (23 + 35.5) g/mol × 0.4 L

=> m = 35.1 g

The correct answer to the first part of your question is option (c): Energy is released by water vapor as it condenses.

When water vapor condenses into liquid water, it undergoes a phase change from a gaseous state to a liquid state. During this phase change, energy is released in the form of latent heat. This release of energy occurs because the water molecules in the vapor phase are more energetic and have higher kinetic energy compared to the water molecules in the liquid phase.

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Answer:

\(\boxed {\boxed {\sf 2.73 \ g \ He}}\)

Explanation:

We are asked to find the mass of helium gas given a volume.

1 mole of any gas occupies a volume of 22.4 liters. So, 1 mole of helium gas contains 22.4 liters of helium. Create a ratio using this information.

\(\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

We are converting 15.3 liters of gas to moles, so we multiply by that value.

\(15.3 \ L \ He *\frac {1 \ mol \ He }{ 22.4 \ L \ He}\)

The units of liters of helium (L He) cancel.

\(15.3 *\frac {1 \ mol \ He }{ 22.4}\)

\(\frac {15.3}{22.4} \ mol \ He\)

\(0.6830357143 \ mol \ He\)

The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table as atomic masses, but the units are grams per moles. Look up the molar mass of helium.

Create another ratio using the molar mass.

\(\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

Multiply by the number of moles we calculated.

\(0.6830357143 \ mol \ He *\frac {4.0026 \ g \ He}{1 \ mol \ He}\)

The units of moles of helium (mol He) cancel.

\(0.6830357143*\frac {4.0026 \ g \ He}{1 }\)

\(2.73391875 \ g \ He\)

The original measurement of volume has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the hundredths place.

The 3 in the thousandths place to the right (2.73391875) tells us to leave the 3 in the hundredths place (2.73391875).

\(2.73 \ g \ He\)

15.3 liters of helium gas is approximately 2.73 grams of helium.

Atomic mass of Sulfur = 32g

32g of Sulfur is one mole.

1g of Sulfur is \( \frac{1}{32} moles \)

96.21g of Sulfur is \( \frac{96.21}{32} moles=> 3moles(appx) \)

Answer:

\(\boxed {\boxed {\sf 3 \ moles \ sulfur}}\)

Explanation:

To convert from grams to moles, the molar mass is used. This value is the number of grams in 1 mole of a substance and it can be found on the Periodic Table. Look for Sulfur or S.

We use this as a ratio.

\(\frac {32.07 \ g \ S}{1 \ mo;\l\ S }\)

Multiply by the given number of grams.

\(96.21 \ g \ S*\frac {32.07 \ g \ S}{1 \ mo\l\ S }\)

Flip the fraction so the grams of sulfur cancel out.

\(96.21 \ g \ S*\frac {1 \ mol \ S}{32.07 \ g \ S }\)

\(96.21*\frac {1 \ mol \ S}{32.07 }\)

\(\frac {96.21 \ mol \ S}{32.07 }= 3 \ mol \ S\)

96.21 grams of sulfur is equal to 3 moles of sulfur.

Answer: they all are 4 properties of matter

Answer:

Explanation:

Mass is a scalar quantity. It has magnitude. In science, volume is a measure of the amount of three-dimensional space an object fills. It’s usually measured in cubic meters based on the SI or metric system. Volume can be represented by three axes – length, width, and height. In practice, however, volume in chemistry is commonly measured in liters and milliliters.  Magnetism is a force that attracts (pulls closer) or repels (pushes away) objects that have a magnetic material like iron inside them (magnetic objects). In simpler words, it is a property of substances which pull closer or repel other objects. It is a subject in physics.  The melting point of a substance is the temperature at which it changes state from solid to liquid.

False

Chemical reactions involve the rearrangement of atoms, but Dalton's atomic theory does not suggest that atoms of a given element are turned into atoms of a different element. Instead, Dalton proposed that atoms are indivisible and retain their identity throughout a chemical reaction. According to his theory, chemical reactions occur when atoms combine, separate, or rearrange to form new compounds, but the atoms themselves do not change into atoms of different elements.

Dalton's atomic theory, which was developed in the early 19th century, laid the foundation for our understanding of chemical reactions and the nature of matter. It stated that elements are made up of tiny, indivisible particles called atoms, and each element is characterized by the unique properties of its atoms. These atoms combine in fixed ratios to form compounds, and in a chemical reaction, the arrangement of these atoms may change, resulting in the formation of new substances.

For example, when hydrogen gas (H2) reacts with oxygen gas (O2), they combine to form water (H2O). According to Dalton's theory, the hydrogen and oxygen atoms remain intact during the reaction, but their arrangement changes. Two hydrogen atoms combine with one oxygen atom to form two water molecules.

In summary, Dalton's atomic theory does not support the idea that atoms of a given element are transformed into atoms of a different element during a chemical reaction. Instead, atoms retain their identity while participating in reactions by rearranging their arrangements to form new compounds.

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Answer: 10,452 degrees

Explanation: the temperature will rise as more methane is added

Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.

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Answer:

1. Neoclassical economics focuses on supply and demand as the driving forces behind the production and consumption of goods and services.

2. It should be noted that Neoclassical economics emphasizes the choices of consumers. Thus, in neoclassical economics, the value of products and services is above the costs of production.

3. Hubbert's peak theory states that the rise, peak, and decline of fossil fuel production with revolutions in new technology will be longer than originally predicted before the oil reserves run out

4. The tragedy of the commons is an economic problem of overconsumptio, and depletion of a common pool resource

5. One thing that puts tremendous pressure on our biodiversity and natural resources is an ever-growing demand for resources by a growing population.