Why do fireworks have different colors? Your answer must include the use of the terms, energy, absorption,
emission, electrons, excited state, ground state, light, metallic elements.

Answer:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

Explanation:

A reaction at equilibrium implies that the concentration/amount of reactants & products present in that reaction don't change but will remain constant. It could also mean that the forward reactions and reverse reactions will occur at the same rates.

when two gases are mixed, if they are to be in thermal equilibrium, they must have the same average molecular speed" is incorrect.

In thermal equilibrium, gases do not necessarily have to have the same average molecular speed. Instead, they should have the same temperature. Temperature is related to the average kinetic energy of the molecules, which includes their speed. However, it is possible for gases with different average molecular speeds to have the same temperature, as long as their average kinetic energy is equal.

Therefore, thermal equilibrium is determined by temperature, not average molecular speed.

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Answer:

YES that is the molar mass can be found as the atomic mass of a single atom, BUT when you get to larger molecules your molar mass will be a combination of atomic masses.

Explanation:

Answer:Proton, the gold foil experiment indicated that the nucleus has a positive charge.

The equation C) C (diamond) + \(O_2\) (g) ‡ \(CO_2\)(g) has ∆HoRXN equal to ∆HoF for the product.


The ∆HoRXN represents the enthalpy change of a reaction, and ∆HoF represents the enthalpy of the formation of a compound.

∆HoRXN is equal to the sum of the enthalpies of the formation of the products minus the sum of the enthalpies of the formation of the reactants.

In this case, we are looking for a reaction where the enthalpy change (∆HoRXN) is equal to the enthalpy of formation (∆HoF) for the product.

Option C fulfills this condition because the reactants are C (diamond) and \(O_2\) (g). The enthalpy of the formation of an element in its standard state, like diamond and \(O_2\), is zero.

Therefore,

∆HoRXN = ∆HoF(products) - ∆HoF(reactants)

= ∆HoF(\(CO_2\)) - [0 (for C) + 0 (for \(O_2\))] = ∆HoF(\(CO_2\)).

This confirms that ∆HoRXN is equal to ∆HoF for the product in option C.

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The mesosphere temperature ranges throughout. With a gain in altitude within the mesosphere, the temperature decreases because of a reduction in the absorption of penetrating solar radiation.

The temperature in the mesosphere varies from -2.5 degrees Celsius to -90 degrees Celsius. Nevertheless, the mesopause can achieve temperatures below -143 degrees Celsius. Normally, the atmosphere gets cooler with an upsurge in altitude because of an increase in the stretch from the Earth's surface, which is a source of thermal radiation that is being reemitted after the absorption of solar radiation. The mesosphere is found instantly above the stratosphere and directly below the thermosphere.

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The ΔG° at 298 K is  1.665 kJ/mol or  1665.45 J/mol in key step in the metabolism of glucose for energy is the isomerization of glucose-6-phosphate (G6P) to fructose6-phosphate (F6P): G6P ⇄ F6P; K = 0.510 at 298 K.

Calculation ,

Formula used for for energy is the isomerization of glucose-6-phosphate (G6P) to fructose6-phosphate (F6P):

: ΔG° = - RT㏑K                 ( i )

Given equilibrium constant ( K ) =  0.510

Temperature in Kelvin ( T ) =  298 K

Universal gas constant ( R ) = 8.3 J/K.mol

Putting the value of temperature ( T ) , equilibrium constant ( K ) and R in equation ( i ) we get ,

ΔG° = - RT㏑K

ΔG° = - 8.3 J/ K.mol × 298 K ×㏑0.510 =  - 8.3 J/mol × 298 K × ( - 0.6 )

ΔG° = 1665.45 J/mol = 1.665 kJ/mol

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Answer:

B. Rabbits

For photosynthesis you need chlorophyll but rabbits don't have it.

The systematic name for the compound Ba(NO3)2 is barium nitrate. Barium nitrate is an inorganic salt with the chemical formula Ba (NO3)2. It is a colorless, odorless, and crystalline solid that is highly soluble in water. The compound is formed by combining one atom of barium and two ions of nitrate.

The name “barium” comes from the Greek word “barys,” which means “heavy,” and is a reference to its high density. The term “nitrate” refers to the polyatomic ion NO3-, which is composed of one nitrogen atom and three oxygen atoms. Barium nitrate is commonly used in pyrotechnics, as it is a powerful oxidizing agent that produces a bright green flame when ignited.

The systematic naming of inorganic compounds is based on the rules set out by the International Union of Pure and Applied Chemistry (IUPAC). The name of an ionic compound is composed of the cation name followed by the anion name. In the case of barium nitrate, “barium” is the name of the cation, while “nitrate” is the name of the anion.

Therefore, the systematic name for the compound Ba(NO3)2 is barium nitrate.

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Answer:

all of the above

Explanation:

all of this is in the solar system

Answer: The ionic formula of compound is \(CoP\) and the name is cobalt phosphide.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here element Co is having an oxidation state of +3 called as \(Co^{3+}\) cation and phosphprous forms \(P^{3-}\) anion with oxidation state of -3. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral \(CoP\)

The nomenclature of ionic compounds is given by:

1. Positive is written first followed by the oxidation state of metal in roman numerals in square brackets.

2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.

Thus the name of \(CoP\) is cobalt phosphide.

Answer: A

Explanation: TOOK THE QUIZ !))   200 YEARS AGOO

Answer:

Layer 1: C - Youngest

Layer 2: A

Layer 3: B

Layer 4: D - Oldest

Answer:

2. d

3. i

4. e

5. j

6. g

7. a

8. f

9. b

Explanation:

do a few searches when you have time to deepen understanding!

Answer: It’s the second one.

Explanation:

Digestion is breaking down food to pass down and fire is chemically changing the partials.

Answer: A squirrel eating acorns and a fire burning

Hope this helps!

Answer:

4g/cm^3

Explanation:

The formula for density is mass divided by volume. 180g is your mass, 45cm^3 is your volume, divide the two to get your answer.

The density of an object with a mass of 180 grams and a volume of 45 cm is 0.4 kg/m.

The measure of the matter is mass. Density and volume can be multiplied to determine the mass. Determining how tightly something is packed. It has such a definition since it is the mass per unit volume.

Volume is the area that a thing takes up. If you weigh two liquids with identical quantities or amounts, the heavier liquid is denser. When gently introduced to the water's surface, a substance that is less thick than water will float.

So the formula will be d = m / v

The mass of the object is 180 g

The volume of the object is 45 cm

Putting the value in the formula

d = 180 g / 45 cm = 0.4 kg/m

Thus, the density of an object will be 0.4 kg/m.

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The octet rule generally refers to a stable arrangement of eight valence electrons in the outermost energy level (or two electrons for hydrogen and helium) for atoms in chemical compounds.

However, there are exceptions to the octet rule, particularly for elements with expanded valence shells or an odd number of electrons. In these cases, the atoms may have more or fewer than eight electrons in their outermost energy level to achieve stability.

The octet rule is a guideline used to understand the stability of atoms in chemical compounds. It states that atoms tend to gain, lose, or share electrons in order to achieve a stable electron configuration with eight electrons in their outermost energy level (except for hydrogen and helium, which strive for two electrons).

This arrangement of eight electrons, known as an octet, is considered stable because it corresponds to the electron configuration of noble gases. Noble gases have full valence electron shells, making them less likely to form chemical bonds. Other elements seek to attain a similar electron configuration by gaining, losing, or sharing electrons with other atoms.

However, there are exceptions to the octet rule. Some elements can accommodate more than eight electrons in their valence shells, leading to expanded octets. Elements in the third period and beyond, such as sulfur and phosphorus, can have expanded valence shells due to the availability of d orbitals. Additionally, atoms with an odd number of valence electrons, such as nitric oxide (NO), may have an unpaired electron, resulting in an incomplete octet.

While the octet rule is a useful guideline for understanding the stability of atoms in chemical compounds, there are cases where atoms may have more or fewer than eight valence electrons to achieve stability, known as exceptions to the octet rule.

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The temperature of the heated gas is approximately 480 K.

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

P1V1/T1 = P2V2/T2

where ;

We can assume that the volume of the tank remains constant, since it is made of metal and is unlikely to expand significantly with temperature changes.

Therefore, we can simplify the equation to:

P1/T1 = P2/T2

Solving for T2, we get:

T2 = (P2/P1) x T1

Substituting the given values, we get:

T2 = (12.846atm / 7.571atm) x 283.2K

T2 = 480 K

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The empirical formula of the butene, C₄H₈ is the CH₂ . The carbon and hydrogen are in the ratio of the 1 : 2.

The molecular formula for the butene = C₄H₈

There are the 8 hydrogen atoms and the 4 carbons atoms. It is clear that the carbon and the hydrogen atom ratio is 1 : 2. so the simpler form the molecular formula that is the empirical formula is as follows :

The empirical formula of the butene = CH₂.

Therefore , in the empirical formula of the butene is in the carbon and hydrogen of the ratio of 1:2.

Thus, the CH₂ is the empirical formula of the butene.

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Explanation:

this question tion is so hard sorry but I can't do is sorry

Answer:

uhm

Explanation:

Answer:

Myelinated, acetylcholine (ACh)

Explanation:

2m/s^2 is the object’s acceleration.

Describe a force.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

According to Newton's second law of motion, the force is equal to the change in momentum divided by the change in time. Force is equal to the mass times the acceleration for a constant mass.

Force ⇒ m.a

F ⇒ 150N

m ⇒ 75kg

a ⇒?

a ⇒ F/m

  ⇒ 150/75

  ⇒ 2m/s^2

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Reaction 1, which has a low activation energy and a higher concentration of reactants, will be faster when the reactants are first mixed compared to Reaction 2, which has a higher activation energy and a lower concentration of reactants.

The rate of a chemical reaction is influenced by various factors, including the activation energy and the concentration of reactants. In this case, Reaction 1 has a low activation energy, indicating that less energy is required for the reaction to proceed. Additionally, Reaction 1 has a higher concentration of reactants, which means there are more reactant molecules available for collisions.

Both a low activation energy and a higher reactant concentration contribute to a faster reaction rate. On the other hand, Reaction 2 has a higher activation energy and a lower concentration of reactants, which will result in a slower reaction rate compared to Reaction 1.

Therefore, when the reactants for each reaction are first mixed, Reaction 1 will be faster due to its lower activation energy and higher concentration of reactants.

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The electronegativity of a metal relates to its work function in that metals with higher electronegativity typically have higher work functions.

When a metal binds with an atom of another element, the degree of the atom's pull toward the electron cloud shared by the metal atom and itself is known as the metal's electronegativity. Electronegativity has been observed to have a strong correlation with the work function of the metal.

Electronegativity has a direct correlation with work function. Electronegativity is a measure of how strongly an element holds onto electrons in a covalent bond or within a molecule. Work function, on the other hand, is the energy required to remove electrons from a metal surface. Electrons are the most loosely bound electrons on the metal surface.

The higher the electronegativity of a metal, the stronger its bond to electrons, and the harder it is to remove them from its surface. As a result, the work function of a metal increases as its electronegativity increases.

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A few important ones........

Answer:

The spacing between the terrestrial planets is less than that between the gas planets.

Explanation:

Since the terrestrial planets which are Mercury, Venus, Earth and Mars have a distance of 0.4 AU, 0.7 A.U, 1.0 AU and 1.5 A.U respectively from while the gas planets which are Jupiter, Saturn, Uranus and Neptune have a distance of 5.2 AU, 9.6 AU, 19.6 AU and 30 AU respectively from the sun, we can see that the spacing between the terrestrial planets is much smaller than the spacing between the gas planets.

For example, the spacing between Mercury and Venus is 0.7 AU - 0.4 AU = 0.3 AU while that between Earth and Venus is 1.0 AU - 0.7 AU = 0.3 AU.

Also, the spacing between Earth and Mars is 1.5 AU - 1.0 AU = 0.5 AU.

Also too, the spacing between the gas planets is shown below  the spacing between Jupiter and Saturn is 9.6 AU - 5.2 AU = 4.4 AU while that between Uranus and Saturn is 19.6 AU - 9.6 AU = 10.0 AU.

Also, the spacing between Neptune and Uranus is 30 AU - 19.6 AU = 10.4 AU.

Thus, we can see that the spacing between the terrestrial planets is less than that between the gas planets.

Note that AU means astronomical unit and 1 AU is the distance between the Earth and the Sun. 1 AU = 1.50 × 10⁸ km

London dispersion forces are the only intermolecular forces that exist between fluorine and chlorine because they are both non-polar covalent compounds.

The coulombic interaction between instantaneous dipoles lead to London dispersion forces.All molecules (and atoms) exhibit dispersion forces, which are typically higher for heavier, more polarizable, and molecules with wider area areas.

The intermolecular forces or attraction that hold molecules together are known as London forces.Although they are a vander waal's force, they are the only one found in substances without polar dipole molecules.

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The electron transport chain is a series of protein complexes and cofactors located in the inner mitochondrial membrane.

It facilitates the transfer of electrons from NADH and FADH2, which are generated during cellular respiration, to ultimately produce ATP. The flow of electrons occurs through a series of redox reactions involving enzymes, cofactors, and molecules. The energy released during electron transfer is used to pump protons (H+) across the membrane, establishing a proton gradient that drives ATP synthesis by ATP synthase.

The electron transport chain consists of several protein complexes: NADH dehydrogenase (Complex I), succinate dehydrogenase (Complex II), cytochrome b-c1 complex (Complex III), cytochrome c, and ATP synthase. NADH and FADH2 donate their electrons to Complex I and Complex II, respectively.

These electrons flow through Complexes I, III, and IV via cofactors like coenzyme Q and cytochromes. As electrons pass through Complexes I, III, and IV, protons are pumped across the inner mitochondrial membrane. This establishes a proton gradient that drives ATP synthesis by ATP synthase. The final products are ATP and water.

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