An excited atom Group of answer choices absorbs energy when an electron returns to the ground state. emits light when an electron jumps up an energy level. has been ionized of all its electrons. has had an electron removed from the atom. releases energy when an electron moves to a lower energy level.

Answer:

Propane burns in air according to the following equation:

C

3

H

8

+5O

2

→3CO

2

+4H

2

O.

1 mole of propane combines with 5 moles of oxygen.

Volume is directly proportional to the number of moles.

1 cm

3

of propane will combine with 5 cm

3

of oxygen.

Only 20% of air contains oxygen. So 1000 cm

3

of air contains 1000cm

3

×

100

20

=200cm

3

of oxygen.

The volume of propane that is consumed on using 1000 cm

3

of air is

5

200cm

3

=40cm

3

.

Reaction

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Avogadro: at the same T and P, the ratio of gas volume = the ratio of gas moles  

volume of CO₂ = 3/1 x 25 = 75 m³

To calculate T2:

ln(5) = (53.11*10^3 J/mol)/(8.314 J/mol.K) * (1/293 - 1/T2)

T2 = (53.1110^3 J/mol)/(8.314 J/mol.Kln(5)) + (1/293)^-1

T2 = 674.9 K

Therefore, the temperature at which the vapour pressure of the substance is 5 times higher than it was at 293 K is 674.9 K.

The heat of vaporization is the energy required to convert one mole of a substance from the liquid to the gaseous state. The vapor pressure of a substance is the pressure exerted by its vapor when in equilibrium with its liquid form at a given temperature.

Vaporization is the process of transforming a liquid into a gas. It is also known as evaporation. Since we know that the particles of a gas are moving faster than those of a liquid, an input of energy must be required for a liquid to become a gas.

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An individual would take approximately 4 grams of aluminum hydroxide, 4 grams of magnesium hydroxide, and 0.4 grams of simethicone in a 24-hour period when following the recommended dose of Maalox.

The recommended dose of Maalox is two teaspoons four times a day. Each 5.0-ml portion of Maalox contains 400. mg of aluminum hydroxide, 400. mg of magnesium hydroxide, and 40. mg of simethicone. To calculate how many grams of each substance an individual would take in a 24-hour period, we need to multiply the dose by the amount of each substance in one dose.

First, let's convert teaspoons to milliliters. Since 1 teaspoon is approximately equal to 5.0 ml, two teaspoons would be equal to 10.0 ml.

Next, we calculate the total amount of each substance in a 24-hour period:

Aluminum hydroxide: 400 mg x 10 (doses per day) = 4000 mg = 4 grams
Magnesium hydroxide: 400 mg x 10 (doses per day) = 4000 mg = 4 grams
Simethicone: 40 mg x 10 (doses per day) = 400 mg = 0.4 grams

Therefore, an individual would take approximately 4 grams of aluminum hydroxide, 4 grams of magnesium hydroxide, and 0.4 grams of simethicone in a 24-hour period when following the recommended dose of Maalox.

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Answer: 1.88 g/mL

Explanation:

Mass of liquid a: (1.00)(15.0)=15.0 g

Mass of liquid b: (1.45)(35.0)=50.75 g.

So, the density is:

\(\frac{50.75+15.0}{35} =\boxed{1.88 \text{ g/mL}}\)

1.88 g/ml

Mass of liquid a: (1.00)(15.0)=15.0 g

Mass of liquid b: (1.45)(35.0)=50.75 g.

So, the density is:1.88g/ml

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

Density describes how compact or concentrated something is. For example, suppose you have two boxes, one large and one small. However, they both weigh the same. That means the small box has a higher density than the large box. Density also tells how concentrated or crowded something is.

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Answer:

Salt and water is produced.

For example:-

NaOH(base)+HCl(Acid)=>NaCl(salt)+H20(water)

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Electrolysis occur when an electric current is passed through a liquid or solution thereby causing the decomposition of chemicals.

For magnesium chloride, it will be heated to be able to conduct electricity. When molten, the MgCl2 will decomposes into Mg2+ and 2Cl- ions. During electrolysis, the elements are separated according to the equations;

According to the half reactions, the Mg2+ is reduced at the cathode (-) and the Cl- is oxidized at the anode (+). Reduction at the cathode shows that magnesium gains two electrons to form a magnesium solid while the chlorine ion looses two electrons at the anode

ﾟ+*:ꔫ:*﹤  ﹥*:ꔫ:*+ﾟAnswer:ﾟ+*:ꔫ:*﹤  ﹥*:ꔫ:*+ﾟ

The following: Jupiter, Saturn, Uranus, or Neptune.

ﾟ+*:ꔫ:*﹤  ﹥*:ꔫ:*+ﾟExplanation:ﾟ+*:ꔫ:*﹤  ﹥*:ꔫ:*+ﾟ

any of the planets Jupiter, Saturn, Uranus, and Neptune whose orbits lie beyond the asteroid belt.

Answer:

it is Saturn

Explanation:

and outer planter is just a planet outside the asteroid belt

Answer:

carbohydrates

Explanation:

i took the test

As per the LeChatelier's principle, the reaction will shift to the right or forward direction.

The provided reaction is,

4NH₃ +5O₂ ⇔ 4NO+6H₂O

Now if we add the oxygen in the reaction, then the oxygen will be going to the reactant side of the reaction,

So, because the reactant concentration is increasing, the reaction will be increased in term of rate and reaction will shift to the right side of the reaction or the forward direction. Because the LeChatelier's principle, say that any change in the equilibrium of the system will be compensated by shifting of the reaction in the counterpartying direction of the reaction.

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Complete question - Use LeChatelier's principle is predict how the reaction will shift 4NH₃ +5O₂ ⇔ 4NO+6H₂O when added more oxygen.

The student's claim of 4.64 × 10^24 molecules is incorrect, and the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

The mistake the student made is assuming that the molar mass of ammonium acetate directly corresponds to the number of molecules. However, the molar mass of a substance represents the mass of one mole of that substance, not the number of molecules.

To determine the correct number of molecules of ammonium acetate used in the reaction, we need to use Avogadro's number, which relates the number of particles (atoms, molecules, etc.) in one mole of a substance.

Avogadro's number is approximately 6.022 × 10^23 particles/mol. Given that the student used 0.100 mol of ammonium acetate, we can calculate the correct number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules = (0.100 mol) × (6.022 × 10^23 molecules/mol)

Performing the calculation, we find that the correct number of molecules of ammonium acetate used in the reaction is 6.022 × 10^22 molecules.

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Answer:

It increases as the size of the ions decreases.

It increases as the charge on the ions increases.

It is a measure of the strength of the bonds between ions in a compound.

Explanation:

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Answer:

boron

Explanation:

Boron and aluminum lie in same group in modern periodic table and both have three valence electrons

Answer:

10 L

Explanation:

The equation of the reaction is;

2BaO2 = 2BaO + O2

Number of moles of  BaO2 = 114.7 g/169.33 g/mol = 0.677 moles

From the reaction equation;

2 moles of BaO2 yields 1 moles of O2

0.677 moles of BaO2 yields 0.677 * 1/2 = 0.3385 moles of oxygen

Hence;

PV=nRT

V = ?

P = 127400 Pa or 1.257 atm

T = 455 K

n = 0.3385 moles

R = 0.082 atmLmol-1K-1

V = nRT/P

V = 0.3385 * 0.082 * 455/1.257

V= 10 L

The rise in kinetic energy with temperatures allows the solvent molecules to break apart the solute molecules that are held by intermolecular attractions.

There are two direct elements that influence solubility are

Temperature stimulates the solubility of both solids and gases, but the pressure is only concerned with the solubility of gases.

Thus,  solids are dissolved in liquid water, the solubility increases with temperature.

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The given statement “Shorter product life cycles have led to increased demand uncertainty and difficulty in forecasting” is true because shorter product life cycles have led to increased demand uncertainty and difficulty in forecasting. It is becoming more difficult to predict demand, and there is a higher probability of product failure than there was in the past.

There are several factors responsible for this increased demand uncertainty and difficulty in forecasting. One of the most significant factors is the decrease in product life cycle length. Shorter product life cycles imply that new items and designs are being introduced on a more frequent basis.Product life cycles are the stages that a product passes through from conception to eventual obsolescence. It starts with the development of the product and continues until the product is no longer in use. It includes the introduction stage, growth stage, maturity stage, and decline stage.A product's life cycle has an impact on supply chain management since it has a significant impact on demand forecasting. As a result, any adjustments in demand forecasts must be accompanied by adjustments in supply chains. In a nutshell, shorter product life cycles have resulted in increased demand uncertainty and difficulty in forecasting, making it more challenging to manage supply chains effectively.

So, shorter product life cycles have led to increased demand uncertainty and difficulty in forecasting is true.

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According to the EPA, the most efficient way to cool or heat a home is through an energy-efficient HVAC system. An HVAC system works by circulating air throughout the home while using less energy than other cooling or heating methods.

Additionally, proper insulation, sealing air leaks, and using programmable thermostats can further improve energy efficiency and reduce costs. It's important to note that regular maintenance and filter changes are crucial to ensure optimal performance and efficiency.


1. Energy Star certified systems are designed to be more energy-efficient, which means they use less energy to provide the same level of comfort as other systems. This helps reduce greenhouse gas emissions and save on energy costs.

2. The EPA recommends regular maintenance of your HVAC system, including cleaning filters and ducts, to ensure optimal performance.

3. Additionally, using a programmable thermostat can help improve efficiency by allowing you to set specific temperatures for different times of the day, reducing energy consumption when it's not needed.

4. Lastly, proper insulation and sealing of your home can also improve the efficiency of your HVAC system by preventing air leaks and retaining the desired temperature.

By following these steps and using an Energy Star certified HVAC system, you can effectively cool or heat your home in the most efficient way.

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Angel has 7.241 ml of saline left.



To find out how much saline Angel has left, we need to subtract the amount she poured out (1.1 ml) from the initial amount she had (8.341 ml).

8.341 ml - 1.1 ml = 7.241 ml

Therefore, Angel has 7.241 ml of saline left.

We need to round this measurement to the correct number of significant figures, which is three since the initial measurement (8.341 ml) had three significant figures. The third digit after the decimal point (1) is less than 5, so we round down the second digit (4). Thus, the answer is 7.241 ml.

Saline is a sterile solution of sodium chloride (salt) in water, commonly used for medical purposes such as intravenous (IV) hydration and wound irrigation.

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An equilibrium between AgCl(s) and its dissolved ions occurs when the aqueous solution is saturated.

In a saturated solution, the maximum amount of solute, in this case AgCl, has dissolved in the solvent at a given temperature, and no more solute can dissolve. This results in a dynamic equilibrium where the rate of dissolution of AgCl(s) equals the rate of precipitation of AgCl(s). The concentrations of the dissolved ions (Ag+ and Cl-) remain constant, and the solution is neither supersaturated nor unsaturated.
In an unsaturated solution, the amount of dissolved solute is less than the maximum that the solvent can dissolve. In this case, the AgCl(s) will continue to dissolve until the solution becomes saturated. On the other hand, a supersaturated solution contains more solute than the solvent can typically dissolve at a given temperature. This occurs when the solution is prepared at a higher temperature and then cooled. Supersaturated solutions are unstable and can lead to the precipitation of excess solute, eventually reaching the saturated state and establishing equilibrium between the solid AgCl and its dissolved ions.

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When substances are dissolved in water, they create a solution. Substances such as ionic compounds, polar and non-polar molecules, and acids/bases have different properties when they dissolve in water. These differences in behavior are due to the chemical and physical properties of the substances being dissolved.

Ionic Compounds: When an ionic compound dissolves in water, it dissociates into its constituent ions. The cations and anions separate and move apart from each other in solution. The dissociation is facilitated by water's polar nature. Because water molecules have a positive and negative end, they surround the ions in solution and pull them apart. For example, when NaCl (sodium chloride) dissolves in water, it dissociates into Na+ and Cl- ions, which are then surrounded by water molecules.

Polar Molecules: Polar molecules are those that have an uneven distribution of electron density across the molecule. Because water is also a polar molecule, polar substances dissolve well in water. Water molecules surround the polar molecules, pulling them apart and solvating them. For example, sugar (a polar molecule) dissolves in water because the water molecules surround it, break its bonds, and dissolve it.

Non-Polar Molecules: Non-polar molecules are those that do not have an uneven distribution of electron density across the molecule. Because water is a polar molecule, non-polar substances do not dissolve well in water. When non-polar substances are placed in water, the water molecules do not surround them or pull them apart. Instead, the non-polar molecules clump together and are expelled from the water. For example, oil is a non-polar substance that does not dissolve in water because the water molecules do not interact with the oil.

Acid/Bases: Acids and bases behave differently when dissolved in water. Acids donate protons (H+) to water molecules, creating H3O+ ions, while bases accept protons from water molecules, creating OH- ions. The concentration of H3O+ and OH- ions in a solution determines the acidity or basicity of the solution. For example, when HCl (hydrochloric acid) is dissolved in water, it donates a proton to a water molecule, creating H3O+ and Cl- ions. The H3O+ ions give the solution an acidic pH.

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The prominent peak at m/z 29 corresponds to the molecular ion C2H5+.

This fragment ion is formed by the cleavage of the C-C bond between the second and third carbon atoms in the 2-methyl-1-pentene molecule. This fragment ion is a secondary carbocation, which is relatively stable and therefore appears as a prominent peak in the mass spectrum.

This ion can be formed from the fragmentation of the original molecule 2-methyl-1-pentene at the bond between the second and third carbon atoms, resulting in the formation of the C2H5+ ion and a C3H7 radical. The structural formula for the C2H5+ ion is shown below:

CH3-CH2+

This ion is also known as the ethyl cation, and it is a common fragment observed in the mass spectra of many organic compounds.

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Therefore, by measuring the amounts of these isotopes and their decay products in a rock, scientists can calculate its age.

The nuclide that has a half-life of 245,000 years in a sample of uranium-containing rock is thorium-230 (230Th).

Uranium-containing rock is used to date the Earth's age, and thorium-230 is one of the four uranium decay series nuclides that are useful in radiometric dating.

Uranium-238, uranium-235, and lead-207 are the other three nuclides. Thorium-230 has a half-life of 245,000 years, which means that half of the thorium-230 in a sample will decay into other elements in 245,000 years.

The decay series of thorium-230 begins with alpha decay into radium-226, which then undergoes further alpha decay into radon-222 and so on until it reaches lead-206, which is stable.

Uranium-238 decays through a series of alpha and beta decays, eventually producing lead-206, and uranium-235 decays through a similar series, eventually producing lead-207.

Therefore, by measuring the amounts of these isotopes and their decay products in a rock, scientists can calculate its age.

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Answer: granitic rocks

Explanation: Continental crust is composed of granitic rocks which are made up of relatively lightweight minerals such as quartz and feldspar. By contrast, oceanic crust is composed of basaltic rocks, which are much denser and heavier.

Answer:

Granites

Explanation:

Continental plates are made from different type of granites as well.

:)

Answer:

b

Explanation:

Taking into account the definition of calorimetry, the energy released is 2283.93 J.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

In this way, between heat and temperature there is a direct proportional relationship. the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of calorimetry:

Q = 0.3845 \(\frac{J}{gC}\)× 26.4 g× (-225 C)

Solving:

Q= -2283.93 J

Finally, the energy released is 2283.93 J.

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When we say a chemical equation is balanced, we mean that the law of conservation of mass is valid.

A chemical equation is said to be balanced if the number of atoms in each element on both the reactant and product sides of the equation is equal. This means that the law of mass conservation is followed, and the total number of atoms of each element is conserved during the chemical reaction.

Adjusting the coefficients of the reactants and products to reach the same amount of atoms of each element on both sides is what balancing a chemical equation entails.

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Explanation:

it will have 9 electrons because atomic number is equals to number of protons and number of protons is equal to number of electrons in an atom

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Answer:

Silver (Ag)

Explanation:

The electronic configuration of copper is shown below;

[Kr]4d10 5s1

We can see that there is only one 5s1 electron. Hence Ag^+ tends to display a pseudo noble gas configuration. This pseudo noble gas configuration explains why silver is prevalent in the +1 oxidation state.

The other transition metals have many stable oxidation states found in nature. Chromium is observed both in +3 and +6 oxidation states. Iron is found in +2 and +3 oxidation states and copper is mostly stable in the +2 oxidation state since the +1 oxidation state readily disproportionate.

Hence silver tends to have only a single ionic charge for reasons aptly stated above.

Answer:

When weather conditions are ideal, some ferns, algae, moss,and even fungi, release spores into the air, often carried by the wind, by insects or birds until they land. Spores contain both male and female reproductive organs, which allows these plants to replicate themselves in a form of cloning.

Explanation: