What is the predicted crystal structure for Nis? You may want to use o Fluorite
o Zinc o blende o Spinel o Rock salt o Cesium chloride o Perovskite

Answer:

The larger piston

Explanation:

(i just took the same test)

If a bone is determined to have an activity of 3.80 cpm per gram of carbon, then the bone is 11,500 years old.

Carbon-14 has a half-life of 5730 years. The initial activity of a living organism is 15.2 counts per minute (cpm) per gram of carbon. In the case of the bone, the activity is 3.80 cpm per gram of carbon. To determine the age of the bone, we can use the formula:

N = N0 * (1/2)^(t / T)

where N is the current activity, N0 is the initial activity, t is the time in years, and T is the half-life of Carbon-14.

Rearrange the formula to solve for t:

t = T * log2(N0 / N)

Plug in the values:

t = 5730 * log2(15.2 / 3.8)

t ≈ 11,500 years

So, the bone is approximately 11,500 years old.

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Answer:C. Removing lead from gasoline to reduce air pollution-Apex

Explanation:

On the day Anastasia wrote about, different air masses are present in different areas of the atmosphere.

The atmosphere is composed of various air masses that have distinct characteristics in terms of temperature, humidity, and stability. These air masses are formed and influenced by factors such as the location of their origin and the prevailing weather patterns. On a specific day, Anastasia wrote about, there would be a variety of air masses across different regions.

In general, air masses can be classified into four main types: polar, tropical, continental, and maritime. Polar air masses are typically cold and form near the poles, while tropical air masses are warm and originate in tropical regions. Continental air masses form over land and tend to be dry, whereas maritime air masses develop over the oceans and contain higher levels of moisture.

The distribution of these air masses on the day Anastasia wrote about would depend on the prevailing weather systems and atmospheric conditions. For example, in regions experiencing a cold front, a polar air mass would likely be present, bringing cooler temperatures. Conversely, areas influenced by a warm front might have a tropical air mass, resulting in warmer temperatures.

The interaction of these air masses can lead to the formation of various weather phenomena such as thunderstorms, hurricanes, or frontal systems. Understanding the characteristics and movements of air masses is crucial for meteorologists in predicting and analyzing weather patterns.

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The question is about the effect of adding more hydrogen chloride to the reaction chamber when the reaction between hydrogen gas and chlorine gas to form hydrogen chloride has reached equilibrium, as represented by the equation:

H2(g) + Cl2 (g) = 2HCl(g)

To understand the effect, we'll use Le Chatelier's Principle, which states that when a system in equilibrium is subjected to a change in concentration, temperature, or pressure, the system will shift in a direction that counteracts the change.

Step 1: Identify the change in the system
In this case, more hydrogen chloride (HCl) is added to the reaction chamber.

Step 2: Determine the effect on equilibrium
Adding more HCl increases the concentration of the product, so the reaction will shift in the direction that reduces the concentration of HCl. In this case, it will shift to the left, towards the reactants (H2 and Cl2).

Step 3: Describe the outcome
The effect of adding more hydrogen chloride to the reaction chamber is that the reaction shifts to the left, favoring the formation of hydrogen gas (H2) and chlorine gas (Cl2) to counteract the increase in HCl concentration.

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The right answer is true. It is accurate to say that because liquids and solids are almost incompressible, pressure has little impact on their solubility.

We are aware that the concept of compressibility refers to how the study object's qualities can alter simply by applying pressure on it. Whether or not a solid, liquid, or gas can have a solubility that is influenced by the substance's pressure depends on the compressibility factor. We must keep in mind that when we discuss pressure in science, our thoughts must immediately turn to the force per unit area of the substance that is being investigated in each specific example. Because the solid and liquid have a fixed volume while the gas does not, the gas will take on the volume of the container it is carried in, proving that the solid and liquid are less compressible than the gas.

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It is accurate to say that because liquids and solids are nearly incompressible, pressure has minimal impact on their solubility.

Pressure has very little or no impact on how easily particles dissolve in liquid. This is due to the fact that solids and liquids are largely unaffected by changes in pressure due to their incompressibility. The solubility, which depends on gas pressure, is a measurement of the concentration of dissolved gas particles in the liquid. A gas's solubility increases with higher pressure while falling with lower pressure because of an increase in collision frequency. · The solubility of liquids and solids is mostly unaffected by external pressure. The concentration of dissolved gas molecules in the solution at equilibrium is higher at higher pressures because the concentration of molecules in the gas phase rises with increasing pressure.

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Answer:

The higher the temperature, the faster the particles move, the lower the temperature, the slower.

The turning black of powders on reaction with iodine is  a chemical property as the powders are undergoing  chemical change.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

O 7.94 x 10-8 M

Explanation:

Did the test

The hydronium ion concentration of a solution with a pOH of 6.90 is 7.94 × 10⁻⁸ M.

Relation between the pH and pOH will be represented by the below equation as:

pH + pOH = 14

Given that pOH = 6.90

So, pH = 14 - 6.90 = 7.1

Also we know that, pH = -log[H⁺]

[H⁺] = \(10^{-pH}\)

[H⁺] = \(10^{-7.1}\)M

[H⁺] = 7.94 × 10⁻⁸ M

Hence the concentration of hydronium ion is \(10^{-7.1}\) M.

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Answer:

173.2 C

Explanation:

have a good day

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

The standard enthalpy of fusion of NaCl is 0.52 kJ/g, that is, it takes 0.52 kJ of heat to melt 1 g of NaCl at its melting point. The heat required to melt 40 g of NaCl is:

\(40 g \times \frac{0.52kJ}{g} = 21 kJ\)

21 kJ of heat are required to melt 40 g of sodium chloride at its melting point.

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Answer: D.)Topsoil

Explanation: Have agriculture

We need to add 2.73 mL of the concentrated acid to obtain a total volume of 175 mL of the dilute solution.

Molarity is defined as the number of moles of solute per liter of solution. A solution that contains one mole of solute per liter of solution is said to be 1 molar (1 M).

We wish to make a 0.186 M nitric acid solution from a stock solution of 12.0 M nitric acid and we want to obtain a total volume of 175 mL of the dilute solution, the amount of concentrated acid we need to add can be determined using the formula shown below: M1V1 = M2V2 where:

M1 is the initial molarity (concentration) of the concentrated acid (12.0 M)

V1 is the initial volume of the concentrated acid (unknown)

M2 is the final molarity (concentration) of the dilute solution (0.186 M)

V2 is the final volume of the dilute solution (175 mL)

Rearranging the formula above, we get: V1 = (M2V2) / M1

Substituting the values given: M1 = 12.0 MM2 = 0.186 MV2 = 175 mL= 0.175 L

Therefore: V1 = (0.186 M x 0.175 L) / 12.0 M= 0.00273 L = 2.73 mL (to two decimal places)

Hence, we need to add 2.73 mL of the concentrated acid to obtain a total volume of 175 mL of the dilute solution.

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Answer:

Alpha particle- B. He (Helium 4 atom )

He  represents an alpha particle and the correct option is option B.

Alpha particles are alternatively known as Alpha radiation or Alpha rays. It is a positively charged particle emitted from the decay of various radioactive materials.

They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.

Alpha particle mass is due to the two protons and two neutrons bonding.

An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom.

Therefore, He  represents an alpha particle and the correct option is option B.

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Answer:

Bromine

Explanation:

Answer:

Bromine??

I think bromine is the answer but i may be wrong

The correct answer is B) zymomonas. Ethanolic fermentation, which is the process of converting sugars into ethanol (alcohol) and carbon dioxide by yeast, is commonly used in the production of beverages like beer, wine, and pulque.

While there are various microorganisms that can carry out fermentation, yeast is the primary organism involved in ethanolic fermentation.

Zymomonas is a type of bacteria that is known for its ability to perform ethanolic fermentation. It can efficiently convert sugars into ethanol and carbon dioxide, making it suitable for industrial applications such as the production of alcoholic beverages.

Clostridium, Leuconostoc, Lactobacillus, and Propionibacterium are other types of microorganisms, but they are not primarily involved in ethanolic fermentation. They may have different metabolic pathways or be associated with other fermentation processes, but they are not the main organisms responsible for the production of ethanol in the context of beverage production.

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To make a 50.0 mL solution of 1.7 M sodium carbonate (Na₂CO3), we need to determine the mass of Na₂CO3 required.

To calculate the mass of Na₂CO3 needed, we can use the formula:

Mass = Concentration x Volume x Molar Mass

First, we convert the given volume from milliliters to liters:

Volume = 50.0 mL = 50.0/1000 L = 0.05 L

Next, we substitute the given concentration and volume values into the formula:

Mass = 1.7 M x 0.05 L x Molar Mass of Na₂CO3

The molar mass of Na₂CO3 can be calculated by adding the atomic masses of sodium (Na), carbon (C), and three oxygen (O) atoms:

Molar Mass of Na₂CO3 = (2 x Atomic Mass of Na) + Atomic Mass of C + (3 x Atomic Mass of O)

After obtaining the molar mass value, we can substitute it into the formula and perform the calculation to determine the mass of Na₂CO3 required to make the 50.0 mL solution of 1.7 M sodium carbonate.

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The pH at the start of the titration, before any barium hydroxide has been added, is 5.88.

Hydrocyanic acid (HCN) is a weak acid, so we can use the equation for the ionization of HCN in water to calculate the pH of the solution:

HCN + H2O ⇌ H3O+ + CN-

The acid dissociation constant (Ka) for HCN is 4.9 x 10^-10. At the start of the titration, before any barium hydroxide has been added, the solution contains only HCN and water. We can use the initial concentration of HCN and the Ka value to calculate the initial concentration of H3O+:

Ka = [H3O+][CN-] / [HCN]

[H3O+] = √(Ka x [HCN]) = √(4.9 x 10^-10 x 0.334) = 1.32 x 10^-6 M

The pH of the solution can be calculated using the equation:

pH = -log[H3O+]

pH = -log(1.32 x 10^-6) = 5.88

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Answer: I'm not sure but I'm making a guess cause that's what I put in mines

Explanation: I think just THINK it's "B.- Slightly Acidic"

HI has the least volume

Given

Gasses and molar mass

Required

The least volume

Solution

Ideal gas law

PV=nRT

V = (nRT)/P

n = mass : MW(Molar weight=molar mass)

\(\tt V=\dfrac{\dfrac{mass}{MW}RT }{P}\\\\V=\dfrac{mass.RT}{MW.P}\)

so V is inversely proportional to MW(molar mass)

Because the values of P, R, T, and mass are the same, what matters is the value of the molar mass of each compound. The larger the molar mass the smaller the volume

From the available molar mass data, HI has the largest molar mass, so HI has the smallest volume

The total vapor pressure of the given solution of toluene and benzene has been 131.004 mm Hg.

What is Dalton's Law of vapour pressure?

According to Dalton's Law, a component's partial vapor pressure is determined by its mole fraction in the gas mixture and is equal to the total pressure times that component's pressure.

From Dalton's law of vapor pressure:

Total Vapor pressure = mole fraction of A \times× Vapor pressure of a + mole fraction of B \times× Vapor pressure of B.

Given, the mole fraction of Benzene = 0.580.

The sum of mole fractions in a solution has been 1.

1 = mole fraction of bemzene + mole fraction of toluene

1 = 0.580 + mole fraction of toluene

Mole fraction of toluene = 1 - 0.580

Mole fraction of toluene = 0.420

Total pressure = (0.580 \times× 183) + (0.420 \times× 59.2) mm Hg

Total pressure = 106.14 + 24.864 mm Hg

Total vapor pressure = 131.004 mm Hg.

Therefore, The total vapor pressure of the given solution of toluene and benzene has been 131.004 mm Hg.

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Hydrogen, helium, carbon, nitrogen, oxygen, fluorine, neon, phosphorus, sulfur, chlorine, argon, selenium, bromine, krypton, iodine, xenon, and radon are among the 17 nonmetal elements.

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Answer:

15-21 is 6

Explanation:

Answer:

The bond order is 1.091

Explanation:

there really is no explanation.

16 mL of 0.610 M NaOH solution is required to neutralize 20.0 mL of 0.245 M H2SO4 solution.

Chemical reaction between acid and a base that results in the formation of a salt and water is called neutralization.

2 NaOH+ H₂SO₄ → Na₂SO₄ + 2 H₂O

Number of moles of  H₂SO₄ in 20.0 mL of a 0.245 M solution is: n( H₂SO₄) = M × V = 0.245 mol/L × 20.0 mL / 1000 mL/L = 0.0049 mol

n(NaOH) = 2 × n( H₂SO₄) = 2 × 0.0049 mol = 0.0098 mol

V(NaOH) = n(NaOH) / M(NaOH) = 0.0098 mol / 0.610 mol/L = 0.016 m³ = 16 mL

Therefore, we need 16 mL of the 0.610 M NaOH solution to neutralize 20.0 mL of the 0.245 M  H₂SO₄ solution.

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Answer:

The density is 2.5625g/mL. Hope this helped! :)

Explanation:

M= 8.2g                                                                               D=M/V

V= 28.3-25.1=3.2mL

D=8.2g/3.2mL

D= 2.5625g/mL