Curium-243 undergoes a decay to plutonium-239:²⁴³Cm ⟶²³⁹Pu + α(c) Find the energy released in kJ/mol of reaction, and comment on the difference between this value and a typical heat of reaction for a chemical change, which is a few hundred kJ/mol.

As 100 ml of 0.16 m naf and 100 ml of 0.16 m hf are combined, the resulting solution's pH rises when compared to the 0.10 m hf solution.

a metric for determining how basic or acidic a thing or solution is. The pH scale ranges from 0 to 14. A pH value of 7 is considered neutral on this scale, meaning it is neither acid nor basic. It's more acidic if the pH value is below 7, and more basic if the pH value is above 7.

The pH scale goes from 0 (very acidic) to 14 (neutral) (strongly basic or alkaline). The neutral range on this scale has a pH of 7.0. Blood typically has a pH range of 7.35 to 7.45, making it mildly basic.

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Answer:

88g

Explanation:

Since the total mass of substances used up in the reaction must be equal to the amount of product formed, according to the conservation of mass law, there must be 64 g + 24 g = 88 g of carbon dioxide present after the reaction.

Answer:

Doctors will use other drugs that are known to be able to treat TB, even if they are less effective than the common drugs.

Explanation:

When a case of drug resistance is established, the doctor has to change the prescription and give other drugs that are also known to be effective against the organism.

Bacterial drug resistance is a common clinical experience. Many established drugs have been found to be ineffective in treating common infections leading to the continuous quest for improved antibiotics that are active against most organisms.

When doctors discover that someone who has an active case of drug-resistant tuberculosis, the doctor may need to change the prescription to other drugs that are also known to be effective against Mycobacterium tuberculosis, the causal agent of tuberculosis.

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Answer:

Steel and cast iron

Explanation:

They are all metal but assuming that you are finding the best material for your pan i suggest going for steel or cast iron

The release of neurotransmitters into the synapse is initiated by depolarization, which opens Ca2+ channels, allowing Ca2+ to move vesicles to the synaptic membrane.

This is the correct answer.When an action potential (AP) arrives at the axon terminal, it results in the opening of voltage-gated Ca2+ channels. The influx of Ca2+ into the nerve terminal causes the exocytosis of neurotransmitter-containing vesicles into the synaptic cleft. Calcium influx is thought to trigger neurotransmitter release via a mechanism that involves Ca2+ binding to the vesicle-associated protein synaptotagmin 1 (Syt1), which promotes the interaction of vesicles with the presynaptic membrane.The entry of Ca2+ through voltage-gated calcium channels is critical for neurotransmitter release, and its absence leads to severe neurological disorders such as ataxia and epilepsy. Calcium ion (Ca2+) is one of the most crucial signaling molecules in cells and is essential for many physiological functions, including neurotransmitter release. Calcium ions activate synaptic vesicle fusion and neurotransmitter release by binding to specific proteins in the active zone of the nerve terminal.

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Answer:

4 meters per second

Explanation:

Answer:

B and BBr3

Explanation:

1) 3HBr + B = BBr3 + H2 (double all equation because H2)

2) 6HBr + 2B = 2BBr3 + 3H2

c.15gof in25mlof wather

The sugar solution that is the most concentrated is 15 g of sugar in 25 mL of water.

CONCENTRATION:

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Answer:

B

Explanation:

a solution is a mixture of more than one solvent, in this case: soda water

Answer:

b soda water

Explanation:

because what the last guy said

For a 1.20 M solution of acetic acid, the percent ionization is 0.133%. For a 0.450 M solution, the percent ionization is 0.158%. For a 0.125 M solution, the percent ionization is 0.240%. For a 4.80x10⁻² M solution, the percent ionization is 0.648%.

The percent ionization of acetic acid can be calculated using the following formula:

% ionization = \($\left(\frac{\text{concentration of ionized acid}}{\text{initial concentration of acid}}\right) \times 100%$\)

The ionization of acetic acid can be represented by the following chemical equation:

\($ \text{HC}_2\text{H}_3\text{O}_2 + \text{H}_2\text{O} \rightleftharpoons \text{H}_3\text{O}^+ + \text{C}_2\text{H}_3\text{O}_2^- $\)

The equilibrium constant for this reaction is the acid dissociation constant (Ka), which is given as\($1.8 \times 10^{-5}$.\)

To calculate the concentration of ionized acid, we can assume that x moles of acetic acid ionize to produce x moles of H₃O+ and x moles of C₂H₃O₂⁻ Since the initial concentration of acetic acid is greater than x, we can approximate the change in the concentration of acetic acid to be x. The equilibrium concentrations of H₃O⁺ and C₂H₃O₂⁻ can be calculated using the equilibrium constant expression for the reaction:

\($K_a = \frac{[\text{H}_3\text{O}^+][\text{C}_2\text{H}_3\text{O}_2^-]}{[\text{HC}_2\text{H}_3\text{O}_2]}$\)

Solving for [ H₃O⁺]:

\($[\text{H}_3\text{O}^+] = \sqrt{K_a \times [\text{HC}_2\text{H}_3\text{O}_2]}$\)

Now, we can use the concentration of H₃O⁺ to calculate the concentration of ionized acid:

concentration of ionized acid = \($[\text{H}_3\text{O}^+] = \sqrt{K_a \times [\text{HC}_2\text{H}_3\text{O}_2]}$\)

With these values, we can now calculate the percent ionization for each given concentration of acetic acid:

A) 1.20 M:

\($[\text{H}_3\text{O}^+] = \sqrt{1.8 \times 10^{-5} \times 1.20} = 1.6 \times 10^{-3}$\) M

concentration of ionized acid = \($[\text{H}_3\text{O}^+] = 1.6 \times 10^{-3}$\)M

% ionization = \($\left(\frac{1.6 \times 10^{-3} \text{ M}}{1.20 \text{ M}}\right) \times 100% = 0.133%$\)=0.133%.

B) 0.450 M:

\($[\text{H}_3\text{O}^+] = \sqrt{1.8 \times 10^{-5} \times 0.450} = 7.1 \times 10^{-4}$\) M

concentration of ionized acid = \($[\text{H}_3\text{O}^+] = 7.1 \times 10^{-4}$\)M

% ionization = \($\left(\frac{7.1 \times 10^{-4} \text{ M}}{0.450 \text{ M}}\right) \times 100% = 0.158%\) = 0.158%.

C) 0.125  M

\($[\text{H}_3\text{O}^+] = \sqrt{1.8 \times 10^{-5} \times 0.125} = 3.0 \times 10^{-4} \text{ M}$\)

% ionization = \($\left(\dfrac{3.0 \times 10^{-4} \text{ M}}{0.125 \text{ M}}\right) \times 100% = 0.240%$\)= 0.240%.

D)\($4.80 \times 10^{-2} \text{ M}$:\)

\($[\text{H}_3\text{O}^+] = \sqrt{1.8 \times 10^{-5} \times 4.80 \times 10^{-2}} = 3.1 \times 10^{-4} \text{ M}$\)

Concentration of ionized acid = \($[\text{H}_3\text{O}^+] = 3.1 \times 10^{-4} \text{ M}$\)

% ionization = \($\left(\dfrac{3.1 \times 10^{-4} \text{ M}}{4.80 \times 10^{-2} \text{ M}}\right) \times 100% = 0.648%$\) = 0.648%.

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Answer:

If an object is moving at a constant speed in a constant rightward direction, then the acceleration is zero and the net force must be zero.

According to Aristotle, a force is anything that causes an item to move "unnaturally." One of the first scientists to explore force and gravity was Sir Isaac Newton. A push or a pull is all that constitutes a force. It might be compared to pushing or pulling on an object.

An object's push or pull is seen as exerting a force. The interaction of the objects produces push and pull. You can also use words like stretch and squeeze to describe force.The definition of force in physics is. The push or pull on a mass-containing item changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

The net force is:

Fnet = Fr - Fl = 10 - 8 = 2N

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Answer:

1. an educated guess

2. data

3. what changes in experiment

4. what stays the same in both groups

5. the group where nothing changes, normal

6. group with independent variable, what's being tested

Answer:

375.8 × 10²³ molecules

Explanation:

Given data:

Number of molecules of acetylene = ?

Volume of cylinder = 1400 L

Temperature = standard = 273.15 K

Pressure = standard = 1 atm

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

PV = nRT

1 atm × 1400 L = n ×  0.0821 atm.L/ mol.K    × 273.15 K

1400 L.atm = n × 22.43  atm.L/ mol

n = 1400 L.atm / 22.43  atm.L/ mol

n = 62.4 mol

1 mole contain 6.022 × 10²³ molecules

62.4 mol × 6.022 × 10²³ molecules / 1 mol

375.8 × 10²³ molecules

The mass of water needed to absorb 456 J is 1.44 g

We'll begin by calculating the change in the temperature of the water.

Initial temperature of water (T₁) = 22.7 °C

Final temperature (T₂) = 98.3 °C

ΔT = T₂ – T₁

ΔT = 98.3 – 22.7

Heat absorbed (Q) = 456 J

Change in temperature (ΔT) = 75.6 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Q = MCΔT

456 = M × 4.184 × 75.6

456 = M × 316.3104

Divide both side by 316.3104

M = 456 / 316.3104

Therefore, the mass of the water is 1.44 g

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Answer:

The correct answer is option A

Explanation:

The extreme temperatures lead to the unfolding of a polypeptide chain resulting in a change in composition and generally a loss of function. If the protein working as an enzyme denatures, it will make that protein to lose its enzymatic activity.

Answer:

Denatures

Explanation:proteins are very sensitive to temperature change

The two basic geologic processes which contributed to the formation of folded mountain ranges like in Glacier National Park include:

This is a geologic process which involve materials in the earth being washed away and transported to other parts by water, wind etc.

In the case of Glacier National Park, ice erodes the mountain thereby resulting in the folding of the sedimentary rocks.

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Answer:

The answer is B. 1,2,6,9,27,54

Explanation:

Answer:

Nucleus and mitochondria. Organism.

Explanation:

The two main organelles are the nucleus and the mitochondria . The nucleus is boss of the factory(controls everything). The mitochondria is the power house of the cell (provides the energy). Humans are organisms (made of organs systems working together) . Another example is plants they are also organisms

Answer:

there is no sound is space or because there in no gravity

Explanation:

Answer:

there are a couple reasons

they would be able to hear outside there suits i believe also gravity is light on the moon so rocks would likely fall softly where they would notice also landslide would be very rare on the moon due to the material the moon i s made of which would moves do to impact and there are a lot of reasons that anyone could make up

Explanation:

but the scientific answer is : sound waves needs a medium to travel just like our planet, we are able to hear each other because the air around us acts as the medium which sound waves travel, however, the moon does not have any air that sound waves,which a landslide would produce, use to travel from one place to another.

Answer:

the blanket let's him slide it across the floor because the has less friction with the floor than the furniture.

Answer:

Blanket underneath the furniture may reduce the kinetic friction

Explanation:

When sliding an object across a surface, the force of kinetic friction will oppose the movement of the object.

By placing a blanket between the object and the surface, the kinetic friction coefficient may be reduced.

Therefore, putting a blanket underneath the furniture may reduce the kinetic friction coefficient, then making it easier to slide the forniture.

(Hi fyi this answer took a lot of time & effort to make sure it was accurate, precise and to the point to be produced, so if you could opt this answer as the brainliest it would mean the world to me,)

Stay positive and Take care,

A fellow mate,

Cheers !

The rate of the forward reaction equals the rate of the reverse reaction is the correct statement when a system is at equilibrium. Therefore, option A is correct.

When a system is at equilibrium, it means that the forward and reverse reactions are occurring at equal rates.

The rate at which reactants are being converted into products in the forward reaction is the same as the rate at which products are being converted back into reactants in the reverse reaction.

At equilibrium, the concentrations of reactants and products may not be equal, but the ratio of their concentrations remains constant. This is known as the equilibrium constant (K) and is determined by the stoichiometry of the balanced chemical equation.

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Answer:

uhm

Explanation:

The resistance of a 7.42 km length of 0 gauge copper wire used for power transmission is approximately 2.36 Ω, considering the resistivity of copper and the wire's cross-sectional area.

To find the resistance (R) of the 0 gauge copper wire used for power transmission, we can use the formula:

\(\begin{equation}R = \frac{\rho L}{A}\)

Where:

ρ is the resistivity of copper,

L is the length of the wire, and

A is the cross-sectional area of the wire.

First, we need to calculate the cross-sectional area of the wire using its diameter. The diameter (d) is given as 8.252 mm, so we can find the radius (r) by dividing the diameter by 2:

\(r = \frac{{d}}{{2}} = \frac{{8.252 \, \text{mm}}}{{2}} = 4.126 \, \text{mm} = 0.004126 \, \text{m}\)

Next, we can calculate the cross-sectional area (A) using the formula for the area of a circle:

A = π * r² = 3.14159 * (0.004126 m)² = 5.346 x 10⁻⁵ m²

Now, we need to determine the resistivity of copper (ρ). The resistivity of copper at room temperature is approximately 1.7 x 10⁻⁸ Ω·m.

Finally, we can substitute the values into the formula to find the resistance (R):

\(R = \frac{{\rho \cdot L}}{{A}} = \frac{{1.7 \times 10^{-8} \, \Omega \cdot \text{m} \cdot 7.42 \times 10^3 \, \text{m}}}{{5.346 \times 10^{-5} \, \text{m}^2}}\)

Calculating the expression:

R ≈ 2.36 Ω

Therefore, the resistance of a 7.42 km length of 0 gauge copper wire used for power transmission is approximately 2.36 Ω.

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The lipoproteins LDL and HDL are thought to influence heart disease risk because LDL is contributing to the formation of plaques and atherosclerosis, while HDL helps remove cholesterol from the arteries.

LDL (low-density lipoprotein) and HDL (high-density lipoprotein) are two types of lipoproteins involved in the transport of cholesterol in the bloodstream. They play a significant role in influencing heart disease risk due to their distinct functions and effects on cholesterol metabolism.

1. LDL: it is often referred to as "bad cholesterol" because it carries cholesterol from the liver to peripheral tissues, including arterial walls. High levels of LDL in the bloodstream can lead to the deposition of cholesterol in arterial walls, contributing to the formation of plaques. These plaques can narrow the arteries and restrict blood flow, a condition known as atherosclerosis. If a plaque ruptures, it can trigger the formation of blood clots, potentially leading to a heart attack or stroke.

2. HDL: HDL, on the other hand, is often referred to as "good cholesterol" due to its beneficial effects on heart health. HDL transports cholesterol from peripheral tissues, including arterial walls, back to the liver for metabolism and elimination. It acts as a scavenger, removing excess cholesterol from the arteries and transporting it away, which can help prevent the buildup of plaques. HDL also possesses anti-inflammatory and antioxidant properties, which further contribute to its protective effect against heart disease.

The balance between LDL and HDL levels in the bloodstream is an essential factor in assessing heart disease risk. High levels of LDL and low levels of HDL are associated with an increased risk of developing atherosclerosis and heart disease. Conversely, higher levels of HDL and lower levels of LDL are generally considered favorable for heart health.

LDL and HDL lipoproteins influence heart disease risk because LDL is associated with the deposition of cholesterol in arterial walls, contributing to atherosclerosis, while HDL helps remove cholesterol from the arteries and has a protective effect. Maintaining a healthy balance between LDL and HDL levels is crucial for reducing the risk of heart disease.

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The final volume of the system is 20.75 liters. This can be calculated by using the ideal gas law equation, PV = nRT, where:

Since the change in internal energy is -325 J, and the heat lost is 155 J, we can calculate the temperature of the system using the equation ΔU = nCvΔT, where Cv is the molar heat capacity of an ideal gas at constant volume (7/2 R).

Plugging in our values, we get ΔT = -325/(7/2 * 0.08206 * 4) = -6.5 K. We can then use this temperature and the pressure from before to calculate the volume of the system using the ideal gas law, resulting in V = nRT/P = (4 mol)(0.08206 L atm mol-1K-1)(273.5 K)/(1.00 atm) = 20.75 L.

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