The nuclide Rn-204 is the daughter nuclide resulting from the α decay of what
parent nuclide?
A) Po-200
B) Th-206
C) Hg-297
D) Ra-208
E) ^4He

Answer:

6. 7870 kg/m³ (3 s.f.)

7. 33.4 g (3 s.f.)

8. 12600 kg/m³ (3 s.f.)

Explanation:

6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.

1 kg= 1000g

1m³= 1 ×10⁶ cm³

Mass of iron bar

= 64.2g

= 64.2 ÷1000 kg

= 0.0642 kg

Volume of iron bar

= 8.16 cm³

= 8.16 ÷ 10⁶

\( = 8.16 \times 10^{ - 6} \: kg\)

\(\boxed{density = \frac{mass}{volume} }\)

Density of iron bar

\( = \frac{0.0642}{8.16 \times 10^{ - 6} } \)

= 7870 kg/m³ (3 s.f.)

7.

\(\boxed{mass = density \: \times volume}\)

Mass

= 1.16 ×28.8

= 33.408 g

= 33.4 g (3 s.f.)

8. Volume of brick

= 12 cm³

\( = 12 \times 10^{ - 6} \: m^{3} \\ = 1.2 \times 10^{ - 5} \: m ^{3} \)

Mass of brick

= 151 g

= 151 ÷ 1000 kg

= 0.151 kg

Density of brick

= mass ÷ volume

\( = \frac{0.151} {1.25 \times 10^{ - 5} } \\ = 12600 \: kg/ {m}^{3} \)

(3 s.f.)

Answer:

See explanation

Explanation:

Now taking A, we can see that if we double the amount of A while keeping the amount of B constant, the rate of reaction doubles, hence we can write;

2^n = 2^1

hence n =1

For B, when the amount of B is doubled while keeping the amount of A constant, the rate of reaction increases eight times. Hence we can write;

2^n = 8

2^n = 2^3

n=3

Hence this reaction has an overall order of 1 + 3 = 4

So we can write;

rate =k[A] [B]^3

Answer:

yes

Explanation:

Answer: The oxidation state of chlorine (Cl) in ClO– is +1.

Explanation:

To determine the oxidation state of iodine (I) in IO3– and chlorine (Cl) in ClO–, we can use the oxidation state rules.

For IO3– (iodate ion):

The sum of the oxidation states for all atoms in a polyatomic ion equals the charge of the ion. In this case, the charge is -1.

Oxygen typically has an oxidation state of -2.

There are three oxygen atoms in the iodate ion.

Let x be the oxidation state of iodine (I). Then, we can write the equation:

x + 3(-2) = -1

x - 6 = -1

x = +5

The oxidation state of iodine (I) in IO3– is +5.

For ClO– (hypochlorite ion):

The sum of the oxidation states for all atoms in a polyatomic ion equals the charge of the ion. In this case, the charge is -1.

Oxygen typically has an oxidation state of -2.

Let y be the oxidation state of chlorine (Cl). Then, we can write the equation:

y + (-2) = -1

y - 2 = -1

y = +1

The oxidation state of chlorine (Cl) in ClO– is +1.

The balance chemical equation is 2H₃PO₄ + 3Mg(OH)₂ → Mg₃(PO₄)₂ + 6H₂O

This is an example of an acid and base neutralizing one another to create salt and water. The reaction is exothermic, emits heat, and can be balanced by adding balancing numbers in front, or molecules, to make sure that the sum of the atom counts for each element on the left and right sides of the equation is the equal.

The law of conservation of matter, which stipulates that matter cannot be generated or destroyed, must be taken into account in order to balance a chemical equation.

H₃PO₄ + Mg(OH)₂ → Mg₃(PO₄)₂ + H₂O

This law states that whatever is available on the reactant side must also be available on the product side.

We must count the atoms on each side of the equation to balance it, and we might also use the number of moles.

The equation is balanced when

2H₃PO₄ + 3Mg(OH)₂ → Mg₃(PO₄)₂ + 6H₂O

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We can actually deduce here that the purpose of this assignment is to teach students about decomposition reactions and allow them to determine the percent yield.

By performing the experiment, students will gain a better understanding of the concepts involved and how they relate to their overall learning.

The specific focus of this assignment is the decomposition of sodium bicarbonate (NaHCO3) to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). The unbalanced chemical equation for this reaction is:

NaHCO3 (s) + heat -> Na2CO3 (s) + H2O (g) + CO2 (g)

To understanding the reaction itself, students will also learn about the concept of percent yield. Percent yield is a measure of the efficiency of a chemical reaction and is calculated by dividing the actual yield of the desired product by the theoretical yield, then multiplying by 100.

This calculation allows students to assess how well the reaction proceeds in terms of producing the expected amount of sodium carbonate.

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Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.

Magma is molten rock that is found deep within the earth's crust whereas Lava is molten rocks that comes up and flows on the earth's surface.

Minerals formed from magma and lava have comparatively different sizes.

Minerals formed from magma are larger in size than minerals formed from Lava. This is because minerals formed from magma undergo slower cooling, and thus, have a longer time to grow in size. However, minerals formed from lava have a relatively shorter cooling time and do not grow into very large sizes.

Therefore, Quartz and Feldspar will be comparatively larger in size since they are formed from cooling of magma while Pyroxene and Olivine are formed by the cooling of lava.

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Answer:

\(Ksp=5.20x10^{-6}\)

Explanation:

Hello there!

In this case, according to the solubility equilibrium of calcium hydroxide:

\(Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-\)

Whereas the equilibrium expression is:

\(Ksp=[Ca^{2+}][OH^-]^2\)

It is firstly necessary to calculate the molar solubility given the grams and volume of the dissolved solute:

\(s=\frac{0.186g/(74.09g/mol)}{0.230L}=0.0109M\)

Now, according to the Ksp expression, we plug in s as the solubility to obtain:

\(Ksp=(s)(2s)^2\\\\Ksp=(0.109)(2*0.0109)^2\\\\Ksp=5.20x10^{-6}\)

Regards!

According to the solution equilibrium,

Now,

The molar solubility will be:

→ \(s = \frac{\frac{0.186}{74.09} }{0.230}\)

     \(= 0.0109 \ M\)

hence,

The Ksp value will be:

→ \(Ksp = (s)(2s)^2\)

By substituting the values,

          \(= (0.109)(2\times 0.0109)^2\)

          \(= 5.20\times 10^{-6}\)

Thus the above approach is right.

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Answer:

The answer is

→ 3.008896419986146

Explanation:

\(18.12*10^2^3\) → \(1.812e+24\) \(atoms\)

\(1.812e+24\) \(atoms\) → \(3.008896419986146\) \(moles\)

Hope this helped! If it didn't, then I'm deeply sorry.

1. Porphyrin[ formal charge=0, found in haemoglobin also  found in cytochrome p-450.

2. Corrin [formal charge=0,found in vitaminB12]

3. Chlorin[formal charge =0,found in chlorophyll as Mg2+chlorin]

What is protein?

Proteins are substantial, intricate molecules that are essential to numerous bodily processes. They perform the majority of their work within cells and are necessary for the development, maintenance, and control of the body's tissues and organs.

For structures please refer attached file

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Cytochrome p-450 and hemoglobin both include porphyrin; Vitamin B12 contains corrin; Chlorophyll contains chlorin.

Neutral molecules: What are they?

A neutral molecule is one that has an equal number of protons and electrons, which prevents it from having a positive or negative electrical charge.

When an atom has an equal amount of protons and electrons, it also has an equal number of positive and negative electric charges . The atom is referred to as neutral since its overall electric charge is zero.

Structure in attachment

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71. The broad, painless, pink-gray, wart-like infectious lesions that may develop on the vulva, perineum, or anus in syphilis are called "condyloma lata."

72. In suspected syphilis infection, the term RPR stands for "Rapid Plasma Reagin." It is a blood test used to screen for syphilis.

73. The recommended dosage of Benzathine Penicillin in an adult in Zambia may vary depending on the stage and severity of the syphilis infection. It is best to consult local guidelines or a healthcare professional for the specific recommended dosage in Zambia.

74. The recommended drug for the treatment of gonorrhea when using syndromic management may vary depending on local guidelines and antibiotic resistance patterns. Commonly used antibiotics include ceftriaxone in combination with azithromycin or doxycycline.

75. The causative organism for chancroid is called "Haemophilus ducreyi."

76. The commonest type of HIV is "HIV-1."

77. The assertive, problem-solving approach to the identification and treatment of the patient's problems is called "clinical decision-making."

78. A tumor arising from the cells producing melanin is also known as "melanoma."

79. The type of sound described as drum-like, loud, and empty quality felt over a gas-filled stomach, intestine, or pneumothorax during percussion is called "tympany."

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Answer:

A) Using the ideal gas law, we can calculate the number of moles of gas present:

```

PV = nRT

```

where:

* P = pressure (atm) = 1 atm

* V = volume (L) = 5.6 L

* n = number of moles of gas

* R = ideal gas constant = 0.08206 L atm / mol K

* T = temperature (K) = 273.15 K

Solving for n, we get:

```

n = (P * V) / RT

```

```

n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)

```

```

n = 0.25 mol

```

Therefore, there are 0.25 moles of gas present.

B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):

```

Molar mass = Mass / n

```

```

Molar mass = 8.0 g / 0.25 mol

```

```

Molar mass = 32 g/mol

```

The molar mass of the gas is 32 g/mol.

C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.

Explanation:

Answer:

48 minutes i think

Explanation:

Answer:

Explanation:

Here, we want to identify the principle in the statement made by the nurse

From the main word here which is "think", we can see that there is some element of uncertainty in the pronouncement

In cases like this, under scientific methods, we can say the nurse has given her hypothesis which she would confirm by administering the necessary laboratory tests (which is the experiment in this case)

The amount of work (in J ) is involved in a chemical reaction if the volume decreases from 4.25 to 1.97 L against a constant pressure of 0.838 atm is: 8.78 Joules.

The work done by an object can be calculated by multiplying the force acting on it by the perpendicular distance covered by the physical object. Also, the work done during a chemical reaction can be determined by multiplying the change in volume by the accompanying level of pressure.

Mathematically, the work done by a system is given by the formula:

Work done = PΔV = P(V₂ - V₁)

Where:

Substituting the given parameters into the formula, we have;

Work done = 0.038(4.25 - 1.97)

Work done = 0.038(2.28)

Work done = 0.08664 L.atm

Next, we would convert L.atm to Joules:

Work done = 101.325 × 0.08664

Work done = 8.78 Joules.

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The branch of chemistry dealing with the physical changes associated with chemical reactions

Answer:

Physical chemistry is the part of chemistry that has to do with the physical structure of compounds, and how they react with other matters and bonds that hold atoms together.

Explanation:

Hope that helps.

Answer:

I'm pretty sure your answer will be 9

Answer:

9

Explanation:

Mass number = proton + neutron

                       = 4 + 5

                       = 9

Answer:

B) hydroxide concentration

Explanation:

Hello,

In this case, since we are talking about strong both base and acid, since the base is the titrant and the acid the analyte, once the equivalence point has been reached, some additional base could be added before the experimenter realizes about it, therefore, since the titrant is a strong base, it completely dissociates in hydroxide ions and metallic ions which allows us to compute the pOH of the solution by known the hydroxide ions concentration.

After that, due to the fact that the pH is related with the pOH as shown below:

pH=14-pOH

We can directly compute the pH.

Best regards.

Answer:

Explanation:

During sexual reproduction the two gametes join together in a fusion process known as fertilization, to create a zygote, which is the precursor to an embryo offspring, taking half of its DNA from each of its parents. In humans, a zygote contains 46 chromosomes: 23 from its mother and 23 from its father

Answer:

When you know the number of moles that you expect, you will multiply by the molar mass of the product to find the theoretical yield in grams. In this example, the molar mass of CO2 is about 44 g/mol. (Carbon's molar mass is ~12 g/mol and oxygen's is ~16 g/mol, so the total is 12 + 16 + 16 = 44.

The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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Answer:mathematical and map

Explanation:

mathematical and map

Explanation:

Answer:

2.4 H\(x^{2}\)

Explanation:

The final temperature of the combined metals is 34.9°C.

Specific heat is the amount of heat energy required to raise the temperature of one unit of mass of a substance by one degree Celsius (or one Kelvin). It is a physical property that is unique to each substance and is often denoted by the symbol "c."

To solve this problem, we can use the principle of heat transfer, which states that when two objects with different temperatures come into contact, up until they reach the same temperature, heat will transfer from the hotter to the cooler object.

We can start by using the formula for heat transfer:

Q = m * c * ΔT

where Q is the amount of heat transferred, m is the mass of the object, c is the specific heat capacity of the material, and ΔT is the change in temperature.

Let's assume that the final temperature of the combined metals is T. We can set up two equations based on the heat transferred from the gold and the heat transferred to the iron:

Heat transferred from the gold: Q1 = (11.1 g) * (0.129 J/g°C) * (T - 15.7°C)

Heat transferred to the iron: Q2 = (18.7 g) * (0.449 J/g°C) * (T - 52.6°C)

Since the total amount of heat transferred must be equal, we can set Q1 = Q2:

(11.1 g) * (0.129 J/g°C) * (T - 15.7°C) = (18.7 g) * (0.449 J/g°C) * (T - 52.6°C)

Simplifying and solving for T, we get:

T = [ (11.1 g) * (0.129 J/g°C) * 15.7°C + (18.7 g) * (0.449 J/g°C) * 52.6°C ] / [ (11.1 g) * (0.129 J/g°C) + (18.7 g) * (0.449 J/g°C) ]

T = 34.9°C

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Increasing the temperature of the solution A formed by mixing liquid B and liquid C, which is endothermic, will generally increase the solubility of B in the solution A.

What is Endothermic?

Endothermic is a term used to describe a process or reaction that absorbs heat or energy from its surroundings. In other words, when a system undergoes an endothermic process, it absorbs heat from its environment, and its temperature usually decreases as a result. Examples of endothermic processes include melting of ice, boiling of water, and the evaporation of liquid into gas.

In chemistry, endothermic reactions are those that require an input of energy in order to proceed, while exothermic reactions release energy. Endothermic reactions are often used in applications such as refrigeration and air conditioning, where the absorption of heat is desirable.

Increasing the temperature of the solution A formed by mixing liquid B and liquid C, which is endothermic, will generally increase the solubility of B in the solution A. This is because increasing the temperature of the solution increases the kinetic energy of the particles, which in turn increases the space between the molecules of the solvent, allowing more solute to dissolve. The exact relationship between temperature and solubility depends on the specific properties of the solute and solvent, but as a general rule, increasing the temperature of an endothermic solution will increase the solubility of the solute.

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Answer:

K = 8x10¹⁸

Explanation:

When you sum a reaction, the result of this sum has a K equal to the multiplication of the K's of the reactions involved in the sum

The sum of two times the reaction:

NaO(g) ⇌ Na(l) + 1/2 O₂(g) K₂ = 2x10⁻⁵

2 NaO(g) ⇌ 2 Na(l) + O₂(g) K = K₂ₓK₂ = (2x10⁻⁵)² = 4x10⁻¹⁰

The result of the inverse reaction:

Na₂O₂(s) ⇌ 2 Na(l) + O₂(g) K₃= 5x10⁻²⁹

2 Na(l) + O₂(g) ⇌ Na₂O₂(s) K = 1/K₃ = 2x10²⁸

And the sum of the two bolded reactions:

2 NaO(g) + 2 Na(l) + O₂(g) ⇌ 2 Na(l) + O₂(g) + Na₂O₂(s)

2 NaO(g) ⇌ Na₂O₂(s) K = 4x10⁻¹⁰× 2x10²⁸

The limiting reactant is Na₂S and the theoretical yield of SnS₂ is 60.9%.

Moles of SnBr₄ = Molarity × volume (L)

                         = 0.605 mol/lit × 0.045 lit

                         = 0.02722 mole

Moles a Na₂S. = Molarity x volume (L).

                        = 0.181 mol/lit X 00538 (lit)

                        = 0.00973 mol

From the balanced chemical equation.

I mole of SnBr₄ = 2 mole of Na₂S

Multiply by 0.02722

0.02722 mole SnBr₄ = 2 x 0.02722 mol Na₂S.

Moles Na₂S required = 0.0544 mol

Moles of Na₂S Present = 0.00973 mol

Hence the limiting reactant is Na₂S.

2 Mole of Na₂S = 1 mole of SnS₂

1 Mole of Na₂S = 1/2 mole of SnS₂

multiply by 0.00973

0.00973 mol Na₂S = 0.009731 mol × 1/2 mol SnS₂

mole of SnS₂ = 0.004865 mol·

Gram of SnS₂ = No of moles x Molar mass

                       = 0.004865m × 182.89 g/mol

                       = 0.889 g

Percent. yield = Practical field / Theoretical yield × 100

= (0.541)/(0.889) × 100

= 60.85%

= 60.9%

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Answer:

Explanation:

When soap is dropped on the floor, it can pick up dirt, germs, and other contaminants from the floor, making the soap itself dirty. However, when the soap is used to clean the floor, it effectively removes the dirt and germs from the floor, leaving it clean. So, the soap can be dirty when it is dropped on the floor, but it becomes clean when it is used to clean the floor.