How much iodine is needed for radiation protection.

Answer:

C im pretty sure. hope this helps

Answer:

Increasing the H+/H3O+ will decrease the pH, while increasing the OH- ions will increase the pH

Explanation:

so pH=-log(H), which means that the smaller H gets to 0, the more the pH rises. The larger the H+ gets, the smaller the pH
if H is 1, then pH is 0
if H is 0.1, then pH is 1
if H is 0.01, then pH is 2
and so on
if H is 0.00000000000001, then the pH is 14
When OH goes up, H goes down, so
if OH is 0.00000000000001, then the ph is 0
if OH is 0.0000000000001, then the pH is 1
and so on
If the OH is 1, then the pH is 14

Answer:

The first ionization energy for K is less than Ca because Ca has a larger effective nuclear charge. There is a large increase in the second ionization energy for K compared to Ca because removal of the second electron from K is a core electron that is in a quantum shell closer to the nucleus.

Explanation:

Answer:

opposites attract, the same repel each other

Explanation:

The reactants are in the aqueous phase, while the product is in the solid phase and water is in the liquid phase.

Aqueous phase is a term used to describe a solution in which water is the solvent. This type of solution is commonly used in chemistry, as water is an excellent solvent for many different types of compounds. In an aqueous solution, the molecules of the solute are dissolved into the water molecules and are then evenly distributed throughout the solution. This process is driven by the strong intermolecular forces between water molecules, which allows them to attract and form strong bonds with other molecules.

Mo^3+(aq) + 3e⁻ → Mo(s)
The balanced redox reaction takes place in an acidic solution, so H+ ions are also consumed in the process. Therefore, the balanced equation is:
Mo^3+(aq) + 3H+(aq) + 3e⁻ → Mo(s) + 3H2O(l)
The reactants are in the aqueous phase, while the product is in the solid phase and water is in the liquid phase.

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Gases behave ideally when both of the following are true:

(1)The pressure exerted by the gas particles is small compared to the space between them.

(2)The forces between the gas particles are not significant.

According to the kinetic molecular theory, gases consist of tiny particles (molecules or atoms) that are in constant random motion. The behavior of gases can be understood based on the interactions between these particles and their motion. When the pressure exerted by the gas particles is small compared to the space between them, it implies that the gas particles are not densely packed, and there is significant empty space between them. This condition allows the gas particles to move freely and independently without significant interactions or attractions between them.

In an ideal gas, the volume of the gas particles is considered negligible compared to the space between them. This means that the size of the gas particles is small relative to the empty space they occupy. Consequently, the gas particles can be treated as point masses with no volume. Additionally, at low temperatures, the molecules of a gas are not moving as fast as at higher temperatures. This slower motion increases the likelihood of molecular collisions and provides more opportunities for interactions between the gas particles.

On the other hand, when the forces between the gas particles become significant, the behavior of the gas deviates from ideal gas behavior. At high pressures, the number of gas molecules increases, leading to a greater volume occupied by the gas particles. The spacing between the particles becomes smaller, and the interactions between them become more significant. This results in deviations from the ideal gas behavior.

The ideal gas behavior is characterized by small pressures exerted by gas particles compared to the space between them and negligible forces between the gas particles. These conditions allow the gas particles to behave independently and move freely. At low temperatures, the slower motion of gas molecules increases the likelihood of interactions between them. Deviations from ideal gas behavior occur when the forces between the gas particles become significant, typically at high pressures or low temperatures. Understanding these principles helps explain the behavior of gases based on the kinetic molecular theory.

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a. The amount of substance remaining as a function of time t can be described by the exponential decay equation:

A(t) = A0 * 0.5^(t/T),

where A(t) is the amount of substance remaining at time t, A0 is the initial amount of substance (9 grams in this case), T is the half-life of the substance (24 hours), and 0.5^(t/T) represents the fraction of the initial amount remaining at time t.

So, the amount of substance remaining at time t can be expressed as:

A(t) = 9 * 0.5^(t/24)

b. To find when there will be 1 gram remaining, we can set A(t) = 1 and solve for t:

1 = 9 * 0.5^(t/24)

0.111 = 0.5^(t/24)

t/24 = log(0.111)/log(0.5)

t = 24 * log(0.111)/log(0.5)

Using a calculator, we can approximate t to be approximately 77.2 hours. So, after 77.2 hours, there will be 1 gram of the substance remaining.

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The percent sugar concentration in orange soda is approximately 13.24%.

The volume of orange soda is given as 355 mL and its density is given as 1.043 g/mL. According to the nutrition label, there are 49 g of sugar in a 355 mL serving of orange soda.Using the density, we can convert the 355 mL volume into grams as follows:Volume = 355 mL; Density = 1.043 g/mL; Mass = ?To convert mL to g we need to multiply the volume with the density. Thus,Mass = Volume x Density= 355 x 1.043= 369.965 gThus, the mass of a 355 mL serving of orange soda is approximately 369.965 g.Next, we can calculate the percentage of sugar in the beverage as follows:Percent sugar concentration = (Mass of sugar / Total mass of beverage) x 100%Percent sugar concentration = (49 g / 369.965 g) x 100%Percent sugar concentration = 0.1324 x 100%Percent sugar concentration = 13.24%Therefore, the percent sugar concentration in orange soda is approximately 13.24%.

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Answer:

Nature versus nurture is a long-standing debate in biology about the balance between two competing factors which determine fate: environment and genetics. The alliterative expression "nature and nurture"

Answer:

environment (nurture) and genetics (nature

Explanation:

environment (nurture) and genetics (nature

Answer:  3597 kJ of heat

Explanation:

According to ideal gas equation:

\(PV=nRT\)

P = pressure of gas = 5.00 atm

V = Volume of gas = 8.00 L

n = number of moles = ?

R = gas constant =\(0.0821Latm/Kmol\)

T =temperature =\(25.0^0C=(25.0+273)K=298K\)

\(n=\frac{PV}{RT}\)

\(n=\frac{5.00atm\times 8.00L}{0.0821 L atm/K mol\times 298K}=1.63moles\)

As it is given :

1 mole of propane produces = 2220 kJ of heat

Thus 1.63 moles of propane produces = \(\frac{2200}{1}\times 1.63=3597kJ\)

Thus 3597 kJ of heat is produced

Answer:

B

Explanation:

They go into a state of dormancy like hibernation .

In this stage they do

Answer:

²⁸Mg

Explanation:

12 electrons means it is a Mg;

A typical Mg has 12 neutrons, but this has 16 hence it must be an isotope with 4 extra neutrons.

Answer

Explanation:

Magnesium Oxide has a formula of MgO.

Magnesium has a molar mass of 24.30g/mol and Oxygen has a molar mass of 15.99g/mol.

From this, we can say we are assuming a 1 mole sample of magnesium oxide, as the stoichiometric coefficients will always be the same, as will the ratio of oxygen to magnesium.

From this,

\(15.99g/mol *1 mol MgO = 15.99 gOxygen\\24.30g/mol *1molMgO=24.30gMagnesium\\Oxygen mass percent = 15.99/(15.99+24.30) = .396\)

The Magnesium equation will be the same but a different numerator. Notice, if there were different coefficients on the elements, you would have to multiply by the stoich coefficient.

Answer: In Arizona, climate change is already making deadly heat waves, droughts and wildfires across the state worse. These impacts have real costs on Arizonans' health and economy, including heat-related deaths, higher electricity bills, crop losses and more.

Explanation:

https://www.edf.org/climate/costofinaction- this is where I gathered this info.  Not mine.  But I hope it helps!

Explanation:

charged particles=8 which is proton and proton=no.of electron. That's why 8 particles are revolving round this center. And this atom structure is of oxygen

If the center of an atom has 8 charged particles that are protons as the neutrons are neutral there will be 8 negative charges that are electrons revolving around the center nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid or  gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged particles  and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged  particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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The balanced equation :

2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O

Given

Reaction

NaHCO(s) --> _CO2+_NaCO(s)+_H2O

Required

The balanced equation

Solution

Maybe the equation should be like this :

NaHCO₃⇒CO₂ + Na₂CO₃+H₂O

Give a coefficient

NaHCO₃⇒aCO₂ + bNa₂CO₃+cH₂O

Make an equation

Na, left=1, right=2b⇒2b=1⇒b=1/2

H, left=1, right=2c⇒2c=1⇒c=1/2

C, left=1, right=a+b⇒a+b=1⇒a+1/2=1⇒a=1/2

The equation becomes :

NaHCO₃⇒1/2CO₂ +1/2Na₂CO₃+1/2H₂O x2

2NaHCO₃⇒CO₂ + Na₂CO₃+H₂O

Adding HCl will not change Keq, but shifts equilibrium to the left, decreasing [H₃O⁺] and [F⁻], and increasing [HF].


The addition of aqueous hydrochloric acid (HCl) to the equilibrium reaction will not change the equilibrium constant (Keq) itself, as Keq is only affected by temperature.

However, the equilibrium position will shift. When HCl is added, it will dissociate into H⁺ and Cl⁻ ions.

The increase in H⁺ concentration (which is equivalent to H₃O⁺ in this context) will cause the reaction to shift to the left, according to Le Chatelier's principle.

This shift decreases the concentrations of both H₃O⁺ and F⁻ ions while increasing the concentration of HF. The equilibrium will re-establish itself, but Keq remains constant.

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1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Both burning food on a stove and dry ice sublimating and becoming a gas are examples of physical and chemical changes.

Physical and chemical changes are two types of changes that occur in matter. A physical change is a change in which the form or appearance of a substance changes, but it does not become a different substance.

On the other hand, chemical change is a change in which one substance is transformed into a new substance with different physical and chemical properties.In the given two changes, burning food on a stove and dry ice sublimating and becoming a gas are the examples of physical and chemical changes.

When food burns on a stove, it changes color and becomes a new substance with different properties. This is an example of a chemical change. Dry ice sublimates and becomes a gas. It is a physical change as the form of dry ice changes, but it does not become a different substance.

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Answer:

H - Cl2 +NaBr -> Br2+2NaCl

Henry's law determines how much a certain gas will dissolve in a certain liquid

The law that determines how much a certain gas will dissolve in a certain liquid is known as Henry's Law. This law states that the amount of gas dissolved in a liquid is directly proportional to the partial pressure of the gas above the liquid. In other words, as the partial pressure of the gas increases, more gas will dissolve in the liquid. This relationship is affected by the temperature of the liquid, with higher temperatures typically resulting in lower gas solubility.

Additionally, the nature of the gas and liquid can impact how much gas will dissolve in the liquid. For example, polar liquids tend to dissolve polar gases more readily than non-polar gases. Understanding the principles of Henry's Law is important in a variety of applications, from industrial processes to environmental studies.

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Astronomers can analyze various characteristics of a star to determine its composition and surface temperature. One of the primary methods is through spectroscopy. Other methods for determining the composition and surface temperature of a star include measuring its brightness and color, studying its luminosity and distance, and observing its behavior and motion through space.

Spectroscopy is a technique that involves breaking down the light emitted by a star into its component wavelengths, much like a prism separates light into a spectrum of colors. Each chemical element in the star's atmosphere absorbs certain wavelengths of light, resulting in dark lines or gaps in the spectrum. By analyzing these absorption lines, astronomers can identify the chemical composition of the star's atmosphere.

Other methods for determining the composition and surface temperature of a star include measuring its brightness and color, studying its luminosity and distance, and observing its behavior and motion through space. Together, these various analyses can provide astronomers with a detailed understanding of the characteristics and properties of a star.

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For a 0.0385 M NaOH solution, the concentration of hydroxide ions ([OH−]) is 0.0385 M, and the concentration of hydronium ions ([H3O+]) is approximately 1.04 × 10^(-13) M.

To calculate the hydronium ion (H3O+) and hydroxide ion (OH−) concentrations for a 0.0385 M NaOH solution, we need to consider the dissociation of water and the reaction between NaOH and water.

The dissociation of water can be represented as follows:

H2O ⇌ H+ + OH−

In pure water, the concentration of hydronium ions and hydroxide ions are equal and can be represented as [H3O+] = [OH−] = x, where x is the concentration in Molarity (M). However, when a strong base like NaOH is added, it reacts with water to produce hydroxide ions:

NaOH + H2O → Na+ + OH− + H2O

Since NaOH is a strong base, it dissociates completely, so the concentration of hydroxide ions ([OH−]) is equal to the concentration of NaOH, which is given as 0.0385 M.

Therefore, [OH−] = 0.0385 M.

Now, since the concentration of hydroxide ions is known, we can use the ion product of water (Kw) to find the concentration of hydronium ions ([H3O+]). Kw is defined as the product of the concentration of hydronium ions and hydroxide ions in water, and it is equal to 1.0 × 10^(-14) at 25°C.

Kw = [H3O+] × [OH−] = 1.0 × 10^(-14) M^2

Substituting the value of [OH−] as 0.0385 M, we can solve for [H3O+]:

[H3O+] × 0.0385 = 1.0 × 10^(-14)

[H3O+] = (1.0 × 10^(-14)) / 0.0385

[H3O+] ≈ 1.04 × 10^(-13) M

For a 0.0385 M NaOH solution, the concentration of hydroxide ions ([OH−]) is 0.0385 M, and the concentration of hydronium ions ([H3O+]) is approximately 1.04 × 10^(-13) M.

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Answer:

Explanation:

Earthquakes are normally caused by underground rock breaking along a fault line. The seismic waves that cause the earth to shake are caused by this sudden release of energy. The plates or blocks of rock begin to move during and after the earthquake, and they continue to move until they become trapped again. As fluid near the center heats up, convection currents develop within the Earth's mantle. Particles pass more quickly as the core heats the bottom layer of mantle material, lowering its density and allowing it to rise. The convection current is started by the growing material.

\(\sf \underline{CuCl_2 +\pink{2NaNO_3} \longrightarrow \pink{ Cu(NO3)_2}+2NaCl}\)

According to the equation, 1 mole of \(\sf CuCl_2 \) reacts with 2 moles of \(\sf NaNO_3\) to produce 1 mole of \(\sf Cu(NO_3)_2\) and 2 moles of \(\sf NaCl \)

Molar mass of \(\sf Cu(NO_3)_2\) -

\( \:\:\:\:\:\:\longrightarrow \sf 63.5 + 2\times 14 + 16 \times 6 \\\)

\( \:\:\:\:\:\:\longrightarrow \sf 187.5 \\\)

Answer:

D) Heat flows from the copper cube to the iron cube.

Explanation:

These are the options for the question

A) Heat does not flow between the cubes.

B) Heat flows in both directions between the cubes

C) Heat flows from the iron cube into the copper cube.

D) Heat flows from the copper cube to the iron cube.

From the knowledge of

second law of Thermodynamicss, which says heat moved from higher temperature to lower temperature region, and termal conduction,energy such as heat will only flow from higher temperature to lower temperature, which means the heat will move from higher concentration to lower Concentration. As the cube of copper at 60 degrees is heated the atoms beginnings to vibrate as it acquire energy then moves and flow to the lower temperature part.

Therefore, Heat flows from the copper cube to the iron cube.