What must happen for an electron to return to its original energy level from a higher energy level?

900 mph................

Answer:

a = 0.8 m/s/s

Vav = 45m/s

Explanation:

Vav = \(\frac{Vi + Vf}{2\\}\)

Vav = \(\frac{10 +80}{2}\)

Vav = 45m/s

a = \(\frac{v}{t}\)

a = \(\frac{4m/s}{5s}\)

a= 0.8m/s/s

Potential energy diagram for a combustion reaction:. CLICK ON IMAGE.

In a typical combustion reaction, the reactants (e.g. a fuel and an oxidizer) are initially at a relatively high potential energy. As the reaction proceeds, the potential energy of the system decreases, and the products (e.g. carbon dioxide and water vapor) are at a lower potential energy than the reactants. The difference in potential energy between the reactants and products corresponds to the heat released during the reaction.

The diagram shows the initial energy level of the reactants, the activation energy required to initiate the reaction, and the final energy level of the products. The activation energy is the minimum amount of energy required for the reaction to occur.

Once the reactants have absorbed enough energy to reach the activation energy threshold, the reaction proceeds spontaneously and releases energy as it progresses to the lower-energy products.

Note that the shape of the potential energy diagram can vary depending on the specific reaction and the reaction conditions. For example, some reactions may have more complex energy profiles with multiple intermediate steps or energy barriers.

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Answer:

true

Explanation:

Answer: True

Explanation:

I took the test :D

Answer:

A.S1 only

Explanation:

A compound is one of the pure substances (other being element) that forms when two or more atoms of an element are chemically combined. According to this question, a solid S1 is heated and it breaks up into gas G and another solid S2 as follows:

S1 (s) ➡ G (g) + S2 (s)

Based on the information in the questio, the solids S1, S2 and the gas G are all pure substances. However, since solid S1 broke down into two other pure substances, it means solid S1 is originally a chemical combination of both products, which denotes a COMPOUND. Note that Gas G and Solid S2 are most likely elements.

Answer:

Explanation: Liquid Chromatography  

I'm sorry if i'm wrong

Answer:

approximately 251.55 grams of AuCl3 would contain 5.0 x 10^23 molecules.

Answer:

To convert joules to calories, you can use the conversion factor:

1 calorie = 4.184 joules

To find out how many calories are in 4,180 joules, divide the given value by the conversion factor:

4,180 joules / 4.184 joules per calorie = 0.9 calories (approximately)

Therefore, there are approximately 0.9 calories in 4,180 joules.

The specific heat of the metal can be calculated using calorimetric equation. The specific heat of the metal here is 0.61 J/g °C.

The specific heat capacity of  substance is the heat energy required to raise its temperature by one degree Celsius per one gram  of the substance.

The calorimetric equation connecting the heat energy q, mass m, specific heat c and temperature difference ΔT is:

q = m c  ΔT

Here, the heat released from the metal is equal to the heat absorbed by water.

Therefore,

q metal = q water. Let c  be the specific heat of the metal.

25 g  × ( 99 - 20.15°C) ×c = 50 g  × ( 20.15°C- 14.33) × 4.18 J/g °C

                                         = 1217.5 J

Then c = 1217.5 J/25 g  × ( 99 - 20.15°C)  = 0.61 J/g °C.

Therefore, the specific heat of the metal is 0.61 J/g °C.

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Mass of aluminum required:

m = n x M = -0.1962 mol x 26.98 g/mol = -5.29 g

let's consider the reaction between aluminum and oxygen to produce aluminum oxide:

4 Al(s) + 3 O2(g) → 2 Al2O3(s) ΔH

Energy required: 658 kJ = 658,000 J

Molar heat of reaction: -3351.4 kJ/mol = -3.3514 MJ/kmol = -3,351.4 kJ/mol = -3,351,400 J/mol

Amount of aluminum required:

n = Q/ΔH = 658,000 J/(-3,351,400 J/mol) = -0.1962 mol

Mass of aluminum required:

m = n x M = -0.1962 mol x 26.98 g/mol = -5.29 g

The negative sign indicates that the given amount of energy cannot be produced by the given mass of aluminum.

What is an aluminium oxide?

Aluminum oxide (Al2O3) is a chemical compound made up of aluminum and oxygen atoms. It is also known as alumina. Aluminum oxide is a white or off-white powder that is insoluble in water and has a high melting point. It occurs naturally as the mineral corundum, which is the second hardest mineral after diamond.

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The mas.s of evaporating dish is 21.345g B.

Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Answer:

Hope this helps ;) don't forget to rate this answer !

Explanation:

To find the number of moles of Cr(NO3)3 in the sample, we need to determine the number of moles of each element present in the compound.

The chemical formula for Cr(NO3)3 tells us that for every 1 mole of Cr(NO3)3, there is 1 mole of chromium (Cr), 3 moles of nitrogen (N), and 9 moles of oxygen (O).

We are given that the sample contains 8.36 moles of oxygen. Since the ratio of oxygen to Cr(NO3)3 is 9:1, the number of moles of Cr(NO3)3 in the sample is 8.36 moles O / 9 moles O/mole Cr(NO3)3 = 0.93 moles Cr(NO3)3.

Rounded to 3 significant figures, the answer is 0.93 moles Cr(NO3)3.

A balanced equation may be used to describe this reaction:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

The Brnsted-Lowry hypothesis is an acid-base reaction theory that was separately proposed in 1923 by Johannes Nicolaus Brnsted and Thomas Martin Lowry. In a chemistry, a Brnsted-Lowry base is a molecule or ion that accepts a hydrogen ion. Because a hydrogen ion is often referred to as a proton, acids and bases are proton donors and acceptors, according to the Brnsted-Lowry definition.

Here,

The acetylide ion (HC=C) acts as a Brønsted-Lowry base in water, accepting a proton from water to form an acetylene cation (H3C+C-):

HC=C + H2O ⇌ H3C+C- + OH-

This reaction can be written as a balanced equation:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

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How many mL of a 0.10 M NaOH solution are needed to neutralize 15 mL of 0.20 M H3PO4?

  5.0 (328)

Ph. D. in organic chemistry with 6+ years of teaching experi..

Write down the balanced reaction first

3NaOH + H3PO4   makes    Na3PO4 + 3H2O

Given 0.10M NaOH (0.10mol/lit NaOH)

0.2M H3PO4 ( 0.2 mol/lit H3PO4)

15 ml of H3PO4 or 0.015 lit of H3PO4

Find volume of NaOH needed to neutralize the solution

Relate moles of H3PO4 with the moles of NaOH with the helps of coefficients in front of NaOH and H3PO4 seen in balanced equations.

               moles ↔ Litre use definition of molarity (moles/litrs)

Start with what is given for H3PO4

0.015 lit of H3PO4 x 0.2 moles of H3PO4 / lit of H3PO4 x 3 moles of NaOH/1 mole of H3PO4 x lit of NaOH/0.1 mol of NaOH = 0.09 lit or 90 ml.

The same colors in above equations cancel our leaving lit of NaOH as final answer.

Answer:

c or b

Explanation:

the story is entertaining and it shares the teachers personal experiences with the teachers students

Dr. Trane's explanation is based on the psychodynamic perspective while Dr. Uni's explanation is based on the behavoiural perspective. The correct option is option C.

Psychodynamic perspective is a psychological approach that focuses on the unconscious mind and how it affects the behavior. According to the psychodynamic perspective, unconscious urges and conflicts that have their roots in early experiences shape how people behave. This approach is developed by Sigmund Freud.

Behavioral perspective

This is the psychological approach that focuses on observable behavior and the influence of the environment on an individual's actions. According to behaviorists, who also emphasize the significance of understanding and influencing behavior without probing interior mental processes, behavior is learnt through interactions with the environment. The early behaviourists are J.F Skinner, John B. Watson and Ivan Pavlov.

These perspectives are parts of psychoanalysis.

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The correct answers to the fill in the blank problems given above are as follows:

Mitotic phase is the part of the cell cycle that divides the material

This process happens only in somatic cells, also is known as body cells.

There are 4 parts of this process:

Mitosis can simply be defined as a special process of cell division in which a single cell divides into two different identical daughter cells.

Aside, mitosis; another major cell division which occurs in the cells of living organisms is the meiosis. Below are the phases involved in mitotic cell division, these are as follows:

In conclusion, it can be deduced from the explanation given above that mitosis is a process of cell division.

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To answer this question, we need to convert grams to moles and then use the Avogadro's number to convert moles to molecules.

The molar mass of Mg(OH)2 is 58.32 g/mol.

First, we need to find the number of moles of Mg(OH)2 in 75.0 g.

75.0 g / 58.32 g/mol = 1.287 mol

Next, we need to convert moles to molecules.

1.287 mol x 6.022 x 10^23 molecules/mol = 7.75 x 10^23 molecules

Finally, we can use the molecular formula of Mg(OH)2 to calculate the number of miles of Mg(OH)2.

1 molecule of Mg(OH)2 contains 3 atoms of oxygen (O) and 2 atoms of hydrogen (H).

So, the total number of miles of Mg(OH)2 is:

7.75 x 10^23 molecules x 2 miles/molecule = 1.55 x 10^24 miles

Therefore, there are 1.55 x 10^24 miles of magnesium hydroxide in 75.0 g of magnesium hydroxide.

Answer:

A metallic bond is the force of attraction between a positively charged metal ion and the valence electrons it shares with other ions of the metal.

Explanation:

Hope this helps :)

Answer:

Metallic bond, force that holds atoms together in a metallic substance. Such a solid consists of closely packed atoms. In most cases, the outermost electron shell of each of the metal atoms overlaps with a large number of neighboring atoms.

Explanation:

The hydroxy aldehyde will undergo intramolecular cyclization to produce a lactol (cyclic hemiacetal), which has the formula C3H6O2.

In this reaction, an aldehyde molecule combines with a hydroxyl group from a different molecule of itself, which is an example of an aldol condensation reaction. The aldehyde molecule can then create a cyclic hemiacetal by combining a carbonyl group and a hydroxyl group to create a hemiacetal. A lactol is the name for this cyclic hemiacetal.

An,-unsaturated carbonyl compound (usually an aldehyde or a ketone) is created by the chemical reaction known as the Aldol condensation reaction from two aldehyde or ketone molecules. In order to produce the unsaturated product, the reaction calls for the nucleophilic addition of the enolate of one molecule to the carbonyl group of the other molecule.

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\(p = 10 \frac{a - b}{(c + t)} \)

Vapor Pressure of Water calculator Formula:

\(p = 10 \frac{a - b}{(c + t)} \)

The sand absorbed869,034.8 Joules of energy from the sun to raise its temperature from 14°C to 31°C.

To calculate the energy absorbed by the sand, we can use the formula:

Q = m * C * ΔT

where:

Given:

Mass of the sand (m) = 58.2 kg = 58,200 g (since 1 kg = 1000 g)

Specific heat capacity of the sand (C) = 0.742 J/g°C

Change in temperature of the sand (ΔT) = 31°C - 14°C = 17°C

Plugging in the values into the formula:

Q = 58,200 g * 0.742 J/g°C * 17°C

Q = 869,034.8 J

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Answer: i dont no

Explanation:

ddd

Answer:

Explanation:

balance

2 C2H6 + 7  O2  --> 4 CO2 + 6 H2O

given 360 g H20 (g)

required =586.67 g CO2

360 g H20 x (1mole/18 g H20) X (4 mole CO2/6 moles H20) X (44g CO2/1mole) =586.67 g CO2

Volume of the balloon at 2.00 × 10⁴ m is 1.52x10³ L

Volume is the three dimensional qualities that is used to measure capacity of solid shape and atmospheric pressure is the air around you has weight and it weighs down everything it touches is called atmospheric pressure

Here given data is

Pi = 1.0 atmosphere = absolute atmospheric pressure

P f = 61.0 mm Hg = atmospheric pressure

= 61.0/760 atmosphere

=  0.0802 atmosphere

Vi =  171 L

T i = 20.0°C = 20+273 = 293 K

T f = 210 K

We have to find volume of the balloon at 2.00 ×10⁴ m =?

Then the formula is

Pi × Vi/T i = P f × V f/T f

1 atm×171 L/293 K = 0.0802× V f/210K

V f = 1.52x10³ L

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Answer:

radiation, hope this helps

The oxygen atom has no formal charge.

The total of its valence and inner shell electron counts equals 8, which is the atomic number of the substance.

Subtract the total number of valence electrons from the total number of non-bonding electrons and half the total number of bound electrons to determine the formal charge of an atom.

More potent oxidants than ozone, oxygen atoms cause chemiluminescence with a variety of analytes. However, this reagent's analytical use is very constrained.

The arrangement of atoms within molecules is referred to as chemical structure. The atoms of the molecule are shown in the Kekulé Formula or structural formula in the sequence in which they are bonded.

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