May someone help me with the answer to this question I’ve been stuck on it

Characteristics of ionic compounds are

1. They develop crystals.

2. Both their melting and boiling points are very high.

3. They are fragile and hard.

4. Compared to molecular molecules, they have higher fusion and vapourization enthalpies. When dissolved in water, they act as an electrical conductor.

5. Ionic solids are excellent insulators because they do not conduct electricity.

An ionic compound in chemistry is a chemical complex made up of ions kept together by electrostatic forces known as ionic bonding. Although the molecule is mostly neutral, it contains positively charged ions known as cations and negatively charged ions known as anions.

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Answer:

they both have gravity

Explanation:

Answer:

gravity

Explanation:

The same fertilizer should be applied to all types of soil, which is false as different soils have different nutrient compositions and physical properties and therefore require different fertilizers to support plant growth.

Sandy soils tend to be low in nutrients and require fertilizers with high nitrogen content, while clay soils retain more nutrients and may require fertilizers with less nitrogen and more phosphorus and potassium. Additionally, different plants have different nutrient requirements, so the type of fertilizer needed will also depend on the crop being grown. Therefore, it is important to test the soil and determine its nutrient needs before applying any fertilizer to ensure the best possible growth and yields.

Hence, the same fertilizer should be applied to all types of soil, which is false as different soils have different nutrient compositions and physical properties and therefore require different fertilizers to support plant growth.

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The percent composition of NaCl in the water is C. 3.6%

Explanation:To calculate the percent composition of NaCl in the seawater, we need to calculate the mass of NaCl in the sample, which is given by: mass of NaCl = moles of NaCl × molar mass of NaCl

We are given that the sample contains 0.317 moles of NaCl.

The molar mass of NaCl can be found by adding the atomic masses of sodium (Na) and chlorine (Cl). This gives us:molar mass of NaCl = atomic mass of Na + atomic mass of Cl

= 23.0 g/mol + 35.5 g/mol

= 58.5 g/mol

Therefore, the mass of NaCl in the sample is:mass of NaCl = 0.317 mol × 58.5 g/mol= 18.5 g

Now we can calculate the percent composition of NaCl in the seawater.

This is given by the ratio of the mass of NaCl to the mass of the sample, multiplied by 100%.

That is:percent composition of NaCl = (mass of NaCl / mass of sample) × 100%

We are given that the sample has a mass of 520 g, so:percent composition of NaCl = (18.5 g / 520 g) × 100%

≈ 0.036 × 100%

≈ 3.6%

Therefore, the answer is C. 3.6%.

Note that the options given in the question are off by a factor of 10. The correct answer is 3.6%, not 36%.

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Answer:

4K + O2 ---> 2K2O

Explanation:

The valence of Potassium is +1

The valence of oxygen is -2

Thus, two atoms of potassium will attach with one atom of oxygen to form molecule of potassium oxide.

This can be written as

2K + O ---> K2O

However, this is not the balanced equation as oxygen exists as O2 molecule.

Thus, the balanced equation is

4K + O2 ---> 2K2O

The balanced equation for the reaction of zinc and lead (II) nitrate to form zinc nitrate and lead is:Zn + Pb(NO3)2 → Zn(NO3)2 + Pb

The above reaction is a double displacement reaction as the two reactants switch their anions and cations in the product. Zinc displaces lead and combines with nitrate to form zinc nitrate, while lead combines with nitrate to form lead nitrate.

                            The above equation is balanced since both the number of atoms and the charge of the reactants are equal on both sides. The balanced equation obeys the Law of Conservation of Mass and Energy, stating that in a chemical reaction, matter and energy are conserved.

Therefore, the amount of matter and energy that exists before the reaction is the same after the reaction.

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Answer:

A. physical change

b. physical change

c. chemical change

d. chemical change

Answer:

IM just too pogchamp

Explanation:

Answer:

Explanation:

Potential energy builds as the coaster is going up the loop-the-loop and converts to kinetic energy on the way down and out of the loop-the-loop. The potential energy of the coaster is at its lowest and the kinetic energy is at its highest as the coaster moves in the lowest point of the loop-the- loop.

Answer:

E-shared

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

The effective nuclear charge (Zeff) is the net positive charge experienced by an electron in an atom, and its trend on the periodic table shows an increase across periods and a slight increase down groups.

Effective nuclear charge (Zeff) refers to the net positive charge experienced by an electron in an atom, taking into account the shielding effect of other electrons present in the atom. It is an important concept for understanding atomic properties and trends across the periodic table.

The trend of effective nuclear charge (Zeff) on the periodic table can be summarized as follows:
1. Across a period (from left to right): Zeff generally increases. This is due to the increase in the number of protons while the shielding effect of inner electrons remains relatively constant.
2. Down a group (from top to bottom): Zeff experiences a slight increase, but the increase is not as significant as the trend across a period. The increase in Zeff is mainly due to the increase in the number of protons, but it is partially offset by the increase in shielding from additional electron shells.

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Answer:

B. 2.14 x 10^-19 J

Explanation:

The energy of a wave of light can be obtained using the equation:

E = h*c/λ

Where E is the energy in joules,

λ is wavelength = 930nm = 930x10⁻⁹m

h = Planck's constant = 6.626x10⁻³⁴Js

c = Speed of light = 3.00x10⁸m/s

Replacing:

E = 6.626x10⁻³⁴Js*3.00x10⁸m/s/930x10⁻⁹m

E = 2.14x10⁻¹⁹J

Right option is:

Synthetic insulin for people with type 1 diabetes restores their glucose homeostasis by converting glucose into glycogen.

Homeostasis is disrupted, it should be controlled or a sickness/sickness may additionally end result. Our body systems paintings collectively to preserve balance. If that balance is shifted or disrupted and homeostasis isn't maintained, the results may not permit the normal functioning of the organism.

Every other hormone glucagon, will increase the concentration of glucose inside the blood and breaks glycogen into glucose whilst the blood sugar stage falls. Any disruption in their characteristic disturbs the glucose homeostasis in the body and causes problems like diabetes.

Once the frame temperature returns to normal, bad remarks will cause the reaction to cease. This sequence of stimulus-receptor-signal-reaction is used for the duration of the body to preserve homeostasis.

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Structures that can be drawn to represent the covalent bonding in a molecule that has more than one position in the molecule for a multiple bond are known as Position Isomers.

Position isomers are isomers with same chemical formula but the functional group is attached to different position of carbon in different structures.

Example-

Hex1-ene , Hex2-ene, Hex3-ene are position isomers with double bond on first, second and third carbon respectively as shown below-

\(CH_2= CH-CH_2-CH_2-CH_2-CH_3\\CH_3-CH=CH-CH_2-CH_2-CH_3\\CH_3-CH_2-CH=CH-CH_2-CH_3\)

Other examples are pent1-yne and pent2-yne where triple bond is on first and second carbon respectively.

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Answer:

Her speed is 6.8m/s.

Explanation:

K.E= 1/2mv²

or, 2543.2= 1/2×110×v²

or, 2543.2 = 55v²

or, 2543.2/55 = v²

or, 46.24 = v²

or, 6.8² = v²

v = 6.8 m/s

answer

6.8

explanation

k.e=1/2v^2

2543.2=55v^2

46.24=v^2

6.8^2=v^2

v=6.8

The pH of a buffer solution containing 0.25 M NH3 and 0.45 M NH4Cl can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([NH4Cl]/[NH3]), where pKa is the dissociation constant of NH4+ (9.25 at 25°C).

The concentration ratio [NH4Cl]/[NH3] is 0.45/0.25 = 1.8. Plugging these values into the equation gives pH = 9.25 + log(1.8) = 9.62.
If 2 mL of 0.2 M NaOH is added to 75 mL of this buffer, the new concentration of NH3 will be 0.25 M and the new concentration of NH4Cl will be 0.45 M + (2 mL/1000 mL)(0.2 M) = 0.494 M. The new concentration ratio [NH4Cl]/[NH3] is 0.494/0.25 = 1.976. Plugging this ratio into the Henderson-Hasselbalch equation gives pH = 9.25 + log(1.976) = 9.68.

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The half-life of cesium-137 is 30 years. Suppose we have a 150 mg sample. The masses (in mg) that remains after t years A=150/2^t/30yrs

A substance's half-life is the amount of time it takes for half of it to decompose.

Half-life is the length of time it takes for half of an unstable nucleus to go through its decay process. A radioactive element's half-life decay time varies depending on the element. For instance, carbon-10 has a half-life of only 19 seconds, making it impossible to discover in nature. On the other hand, uranium-233 has a half-life of almost 160000 years.

When n half-lives have passed, the formula for estimating the amount still left is:-

A=A°/2^n

where,

A=initial amount

A°=remaining amount

n=t/t_{1/2}

A=150/2^t/30yrs

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This is a false statement. An aquarium is not divided by a membrane that is not permeable to any ion. Such a membrane is called an ion-selective membrane.

If such a membrane were present in the aquarium, the potential difference between the two sides would indeed be 58 mV, according to the Nernst equation. However, in reality, there would be no potential difference because ions would be able to cross the membrane. In fact, many aquariums use ion-selective membranes to maintain a stable environment for their aquatic organisms. The membrane allows for the regulation of ion concentrations and pH levels in the aquarium. So, in summary, the statement is false because an aquarium is not typically divided by a membrane that is impermeable to ions.

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Liquids at room temperature do not readily transition into solids or crystals (Option D) is why is it usually not possible to recrystallize a liquid substance.

Recrystallization involves dissolving a solid in a suitable solvent and then allowing it to cool and reform into crystals. However, liquids do not readily form crystals at room temperature because their molecules are disordered and lack the organized arrangement necessary for crystal formation.

Additionally, liquids may have insufficient intermolecular forces to hold the crystal lattice together. Therefore, recrystallizing a liquid substance is usually not possible.

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When an alpha particle is emitted from an unstable nucleus, the atomic mass number of the nucleus decreases by 4 and the atomic number decreases by 2.

This is because the alpha particle contains two protons and two neutrons, which means it has an atomic mass number of 4 and an atomic number of 2. When it is emitted from the nucleus, it takes away these particles from the parent nucleus, resulting in a decrease in both atomic mass number and atomic number.

Radioactivity is the process of emitting radiation from unstable atomic nuclei. There are three main types of radiation that can be emitted from a nucleus: alpha particles, beta particles, and gamma rays. When an alpha particle is emitted from an unstable nucleus, it causes a decrease in the atomic mass number of the nucleus.

This is because an alpha particle contains two protons and two neutrons, which means it has an atomic mass number of 4 and an atomic number of 2. When it is emitted from the nucleus, it takes away these particles from the parent nucleus, which results in a decrease in the atomic mass number and atomic number.

There are several reasons why an atomic nucleus may emit an alpha particle. One reason is that the nucleus is too large and unstable, and it needs to release some of its energy to become more stable. Another reason is that the nucleus has too many protons and needs to reduce its atomic number to become more stable.

Whatever the reason, the emission of an alpha particle is an important process in nuclear physics and has many applications in industry, medicine, and research

In summary, when an alpha particle is emitted from an unstable nucleus, the atomic mass number of the nucleus decreases by 4 and the atomic number decreases by 2. This is because the alpha particle contains two protons and two neutrons, which means it has an atomic mass number of 4 and an atomic number of 2.

When it is emitted from the nucleus, it takes away these particles from the parent nucleus, resulting in a decrease in both atomic mass number and atomic number.

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When radium (atomic number 88) emits an alpha particle, it loses two protons and two neutrons from its nucleus. This means that the resulting nucleus will have an atomic number that is two less than the original radium nucleus, which would be 86.

This new element with atomic number 86 is called radon. Radon is a radioactive gas that is odorless, colorless, and tasteless. It is a naturally occurring element that can be found in soil, water, and rocks. Radon gas is known to cause lung cancer when inhaled over long periods of time, so it is important to test for and mitigate high levels of radon in homes and buildings.

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Answer:  Shaun must consume 6 more g of protein to reach the required amount.

Explanation:

Given : Recommended amount of protein = 200 calories

Now 4 calories = 1 gram of protein

Thus 200 calories = \(\frac{1}{4}\times 200=50\) g of protein.

Calories consumed per day by Shaun = 176 calories

176 calories =  \(\frac{1}{4}\times 176=44\) g of protein.

Thus Shaun need to consume = (50-44) g = 6 of protein to reach the required amount.

Shaun must consume 6 more g of protein to reach the required amount.

About 0.25 liters of 6.0 m solutions of HCl should be added to create 2.0 liters of a 0.75 m HCl solution.

Lowering a solute's concentration in a solution is the process of dilution. It entails adding significantly additional water or solvent to the solution. When more solvent is added to a solution without extra solute, the solution gets diluted.

The dilution formula is  M₁V₁=M₂V₂. Here, M₁ is the initial molarity, M₂ is the final molarity, V₁ is the initial volume, and V₂ is the final volume.

Given, M₁ is 6.0 M, M₂ is 0.75 M, and V₂ is 2.0 L. We have to find V₁.

\(\begin{aligned}V_1&=\frac{M_2V_2}{M_1}\\&=\frac{0.75\times2}{6}\\&=\mathrm{0.25\; L}\end{aligned}\)

The answer is 0.25 L.

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The carbon atom, C1, has two σ bonds in propylene, one with H and one with the other carbon. It also has one π bond with the other carbon.

Propylene, also known as propene, is a molecule that has the formula \(CH_2CHCH_3\). In propylene, the bond between C1 and C2 is composed of a sigma bond and a pi bond, which form from the overlap of hybrid orbitals on the two carbon atoms. Each carbon atom in propylene has three hybrid orbitals that mix the atomic orbitals of carbon with the orbitals of hydrogen. Because carbon has four valence electrons, one 2s orbital and three 2p orbitals are combined to form hybrid orbitals. C1 and C2 are sp2 hybridized, meaning they each have three sp2 hybrid orbitals.

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Answer:

Gold Iron Titanium Lithium

Explanation:

Answer:

A

Explanation:

10ml

PLEASE MARK AS BRAINLIEST

Answer:

10.2 mol

Explanation:

given,pressure=240kpa

volume=31L

temperature=87.65°c

req,mole=?

now we have the equation

pv=nRt

When,p=pressure

v=volume

n=moles

R=gas constant

t=temperature

gas constant(R)=8.314L.kpa/k.mol

solution

from the first equation we have an equation

n=pv/Rt

=240×31/8.314×87.65

=7440/728.72

=10.2 mol