I really need help with this chemistry assignment multiple choice

A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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The binder found in high-fiber foods that inhibits the absorption of iron and zinc is oxalic acid Choose raw fruits and vegetables instead of juice, and consume the peels. Alternative fiber sources include whole buckwheat, whole wheat couscous, quinoa, bulgur, wheat germ, chia water seeds, hemp seeds, lentil pasta, and edamame pasta.

Popcorn is a complete grain. Serve it low-fat and without butter for a healthy snack option. It is a white crystalline substance that dissolves colorlessly in water. It got its name from the fact that early researchers obtained oxalic acid from blooming plants of the genus Oxalis, sometimes known as wood-sorrels.

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The theoretical yield of sodium bromide formed from the reaction of 1.6 g of hydrobromic acid and 0.20 g of sodium hydroxide is 2.04 g.

The theoretical yield of sodium bromide is calculated by the equation: mass of sodium bromide = (moles of hydrobromic acid) x (molar mass of sodium bromide). First, you need to calculate the moles of hydrobromic acid. This can be done by dividing the mass of hydrobromic acid (1.6 g) by the molar mass of hydrobromic acid (80.91 g/mol):

Second, you need to calculate the moles of sodium hydroxide. This can be done by dividing the mass of sodium hydroxide (0.20 g) by the molar mass of sodium hydroxide (39.99 g/mol):

Moles of sodium hydroxide = 0.20 g / 39.99 g/mol = 0.005 moles.

Moles of hydrobromic acid = 1.6 g / 80.91 g/mol = 0.0198 moles.

Finally, the theoretical yield of sodium bromide can be calculated by multiplying the moles of hydrobromic acid (0.0198 moles) by the molar mass of sodium bromide (102.89 g/mol):

Theoretical yield of sodium bromide = 0.0198 moles x 102.89 g/mol = 2.04 g.

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Answer:

Because both the zones have different compositions.

Explanation:

The continental crust is composed of mainly graphite whereas the oceanic crust is made up of basalt. The oceanic plates are thinner than the continental plates. Also the oceanic plates are much denser as compared to the continental plates. Now the continental plates at the convergent boundary gained thickness as they are pushed upward. These plates or zones are of different composition an densities and so when they collide different features can be seen at the two conversion zones.

Waist-mounted accelerometry is a non-invasive method that uses accelerometers to detect and analyze movement patterns associated with freezing of gait in individuals with Parkinson's disease, providing valuable insights for understanding and managing this symptom.

Freezing of gait (FOG) is a common and disabling symptom experienced by individuals with Parkinson's disease (PD). It refers to a sudden and temporary inability to initiate or continue walking, often described as feeling "stuck to the ground." Identifying FOG episodes can be challenging, but waist-mounted accelerometry has emerged as a potential tool for this purpose.

Accelerometry involves measuring changes in acceleration, and waist-mounted accelerometers can detect subtle movements and changes in body posture. By analyzing the data collected from these devices, researchers can identify FOG events during freezing-provoking tasks.

During freezing-provoking tasks, individuals with PD are asked to perform specific actions that are known to trigger FOG, such as turning, stepping over an obstacle, or changing direction. The accelerometers worn around the waist can capture the changes in movement patterns during these tasks. This data is then analyzed to identify FOG episodes based on specific movement patterns and characteristics associated with FOG.

The advantage of waist-mounted accelerometry is its non-invasiveness and ability to provide objective measurements of FOG. It allows for continuous monitoring of FOG episodes in a real-world setting, providing valuable insights into the occurrence, duration, and severity of FOG. This information can help healthcare professionals better understand FOG and develop targeted interventions to manage and alleviate this symptom.

In summary, waist-mounted accelerometry is a promising method for identifying freezing of gait in Parkinson's disease during freezing-provoking tasks.

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KMnO4; NaMnO4; LiMnO4

FeO ; FeCl2; FeS ; FeSO4

HBrO3; KBrO3; NaBrO3; LiBrO3

PbO2; PbS2; Pb(SO4)2; Pb(CO3)2

Ionic compounds are made up of charged particles called ions, which are created when an atom (or group of atoms) gains or loses an electron. An ion is classified as either positively or negatively charged depending on its charge.

Chemical formulas for compounds that simply specify the proportions of the elements they contain rather than the exact number or arrangement of atoms are known as empirical formulas. The element in the compound with the lowest whole number ratio would be this one.

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Greenhouse gases are the gases that trap heat in the atmosphere of the earth. Methane is the greenhouse gas that contributes most to the greenhouse effect.

The greenhouse effect is the process due to the greenhouse gas that entraps the heat and sun rays from the sun that increases the temperature of the atmosphere.

The methane gas is found as 180th million in 1 percent and lives around 25 years in the atmosphere also has 25 more strength than carbon dioxide. Methane is found as natural gas and is a potent greenhouse gas.

Therefore, methane contributes most to the greenhouse effect.

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Answer:

A meso compound is a non-optically active member of a set of stereoisomers, at least two of which are optically active.

Answer:

Mass is lost due to the conversion of mass to energy

Explanation:

The question is not complete, the complete question is given as:

        \(^{235}_{72}U +^{1}_{0}n\)                       ⇒        \(^{140}_{56}Ba+^{93}_{36}Kr+3^{1}_{0}n+energy\)

total mass equals 236.053 u              total mass equals 235.868 u

Which statement explains the energy term in this reaction? (1) Mass is gained due to the conversion of mass to energy. (2) Mass is gained due to the conversion of energy to mass. (3) Mass is lost due to the conversion of mass to energy. (4) Mass is lost due to the conversion of energy to mass.

Answer: From Einstein’s equation  E = mc², when a radioisotope element undergoes fission or fusion in a nuclear reaction, it loses a tiny amount of mass.This mass lost is converted to energy.

The law of conservation of energy  holds for this type of reaction (i.e  the sum of mass and energy is remains the same in a nuclear reaction). Mass changes to energy, but the total amount of mass and energy combined remains the same before and after a nuclear reaction.

From the reaction above, the total decrease in mass = 236.053 - 235.868 = 0.185 u

Answer:

maybe C?

Explanation:

srry if wrong

hope it helps

Answer: C.

Explanation:

A. Is out because we know that it can melt iron and nickel B. Is out because metal is most definitely meltable

And for D. Between 8,132° and 9,932° Fahrenheit Is the temperature of the outer core

The air mass with the highest actual water vapor content is mT maritime tropical. The correct answer is A.

Maritime tropical air masses are warm and humid because they originate over warm ocean waters, which allows for a high amount of water vapor to be evaporated and contained within the air mass.

As such, mT air masses are known for their high dew point temperatures and can bring about humid and rainy conditions when they encounter cooler air masses.

Air masses are large bodies of air with relatively uniform temperature, humidity, and pressure characteristics that cover vast areas of the Earth's surface.

They play a critical role in determining the weather patterns in different regions of the planet.

The actual water vapor content of an air mass is determined by the temperature and humidity of the region from which it originates.

The mT (maritime tropical) air mass is known to have the highest water vapor content because it originates over warm ocean waters, which have a high capacity to evaporate water into the atmosphere.

This allows the air mass to hold a significant amount of moisture, resulting in high dew point temperatures and the potential for rain.

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Answer:

(a) proton

(b) neutron

(c) electron

particles in nucleus are proton and neutron.

atom is electrically neutral because no.of proton= no.of electron=6

The correct coefficients for the chemical reaction between hydrazine and hydrogen peroxide is 1, 2, 1, 4 (option B).

Coefficients in a chemical reaction are numbers placed in front of formulas to balance equations.

A chemical equation is balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, hydrazine reacts with hydrogen peroxide to form nitrogen gas and water as follows:

N₂H₄ + 2H₂O₂ → N₂ + 4H₂O

As observed in the above chemical equation, the correct coefficients for the chemical reaction from left to right is 1, 2, 1, 4.

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Answer:

E

Explanation:

Just e

Answer:

We need the picture to answer the question

Explanation:

but i did do this test and number 4 was biotic and number 5 was abotic hope this helped

Explanation:

octet is an atom or an ion having a maximum of eight electrons in the outermost shell while duplet is an atom having the maximum of two electrons in the outermost shell

the number of moles of KHP (potassium hydrogen phthalate) using its molecular weight. The molecular weight of KHP is not provided in the question, but we can assume it is 204.23 g/mol.

we need to determine the number of moles of KOH that reacted with the KHP. This can be done using the balanced chemical equation for the neutralization reaction between KHP and KOH, which is:   According to the balanced equation, one mole of KHP reacts with one mole of KOH. Therefore, the number of moles of KOH is equal to the number of moles of KHP.

I assumed the molecular weight of KHP since it was not given in the question. It's important to have the accurate molecular weight to obtain the correct molarity. Additionally, the volume of KOH solution was converted from milliliters to liters to ensure consistent units for the molarity calculation.

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Answer:

the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.

Explanation:

Answer:

6 valence electrons

Explanation:

The atom you have given is a sulfur atom. It has 6 valence electrons.

The pH of the solution after 25.0 mL of KOH has been added to the acid is  10.37.

HCOOH is a weak acid that reacts with KOH (a strong base) to form the HCOO⁻ ion and water:

HCOOH + KOH → HCOO⁻ + H₂O

The balanced chemical equation shows that the stoichiometric ratio of HCOOH to KOH is 1:1, so 25.0 mL of 0.20 M KOH corresponds to the same amount of moles of HCOOH. This means that 25.0 mL of the original 0.35 M HCOOH solution has reacted with the 25.0 mL of 0.20 M KOH solution.

moles of HCOOH remaining = moles of HCOOH initially - moles of KOH added

moles of HCOOH initially = 0.35 mol/L × 0.0250 L = 0.00875 mol

moles of KOH added = 0.20 mol/L × 0.0250 L = 0.00500 mol

moles of HCOOH remaining = 0.00875 mol - 0.00500 mol = 0.00375 mol

The concentration of the remaining HCOOH is:

[ HCOOH ] = moles of HCOOH remaining / volume of solution remaining

= 0.00375 mol / (25.0 mL + 25.0 mL)

= 0.075 M

Now we can use the expression for the dissociation constant of HCOOH to calculate the pH of the solution:

Ka = [ H⁺ ][ HCOO⁻ ] / [ HCOOH ]

We can assume that the HCOO⁻ ion behaves as a weak base and calculate its concentration using the equation:

[ HCOO⁻ ] = Ka / [ HCOOH ]

[ HCOO⁻ ] = (1.77 × 10⁻⁴) / 0.075 ≈ 2.36 × 10⁻³ M

Now we can use the equation for the ionization of water to calculate [ H⁺ ]:

Kw = [ H⁺ ][ OH⁻ ]

1.00 × 10⁻¹⁴ = [ H⁺ ][ 2.36 × 10⁻³ ]

[ H⁺ ] = 4.24 × 10⁻¹¹ M

Therefore, the pH of the solution is:

pH = -log[H⁺] ≈ 10.37

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Rainwater is affecting the parts of earth's surface that contain rocks through what is referred to as physical weathering.

This is also referred to as mechanical weathering and it is the process in which is the disintegration of rocks and minerals without any chemical change being experienced and the major agents of this type of weathering are water and wind.

Rainwater seeps into parts of the earth surface which contains rocks and weaken it which leads to it breaking into smaller particles as time goes thereby resulting in the formation of soil etc. This is therefore the effect rainwater has on rocky part of the earth surface.

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Answer:

here :). hope this helps.

The given equation is not a balanced chemical equation as the mass of atoms on the both reactant and product side is not equal. Therefore, this equation does not demonstrate the law of conservation of matter.

A chemical equation can be defined as the representation of a reaction with help of symbols of the substances. A chemical equation includes of reactants participating and formed products separated by an arrow in the equation.

The chemical equation in which the mass of reactants is equal to the mass of the products is called a balanced chemical equation. For that, the law of conservation of mass should be followed by a balancing of a chemical equation which says that the mass can neither be created nor destroyed.

The given chemical equation of silver oxide is:

\(Ag_2O\longrightarrow Ag+O_2\)

The number of atoms of silver and oxygen is not equal on both sides.

The balanced chemical equation will be for the above reaction:

\(2Ag_2O\longrightarrow 4Ag +O_2\)

and this equation demonstrates the law of conservation of matter.

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Answer:

C. An electronegativity difference of less than 1.7 between the atoms

Explanation:

I have no idea but that’s correct I just answered it on apex

An electronegativity difference of less than 1.7 between two atoms best classifies a covalent bond.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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Answer:

Zinc Carbonate

Zinc Nitrate

Explanation:

Answer: Aluminum is ideal for aircraft manufacture because it's lightweight and strong.

Explanation:

There are approximately 0.38133 moles of nitrogen in the sample of epinephrine. Epinephrine is both a neurotransmitter and a hormone, but it acts mainly as a hormone. Epinephrine, also known as adrenaline, plays an important role in your body's fight-or-flight response. It's also used as a medication to treat many life-threatening conditions

To determine the number of moles of nitrogen in the sample of epinephrine, we need the molar ratio between carbon and nitrogen in the compound. Without this information, we cannot provide a direct answer. The molar ratio can be obtained from the chemical formula of epinephrine (C9H13NO3), which indicates that there is 1 nitrogen atom for every 9 carbon atoms.

Using this information, we can set up a proportion:

(Number of moles of nitrogen) / (Number of moles of carbon) = (Number of nitrogen atoms) / (Number of carbon atoms)

Since we know the number of moles of carbon is 3.432, we can solve for the number of moles of nitrogen:

(Number of moles of nitrogen) / 3.432 = 1/9

Cross-multiplying, we get:

(Number of moles of nitrogen) = (3.432 * 1) / 9

Calculating the result:

(Number of moles of nitrogen) = 0.38133 moles

Therefore, there are approximately 0.38133 moles of nitrogen in the sample of epinephrine.

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Ionic solids are composed of positively and negatively charged ions held together by electrostatic forces of attraction.

In these solids, electrons are transferred from one atom to another, resulting in the formation of ions with opposite charges. The movement of electrons is restricted, as they are localized within their respective ions. The strength of the bond in ionic solids is primarily determined by the magnitude of the charges on the ions and the distance between them. The greater the charge and the smaller the distance, the stronger the electrostatic attraction and the more stable the ionic solid.

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