3.Convert 50 degree Celsius to Fahrenheit ​

the answer should be a the the question

The decomposition of aspirin (acetylsalicylic acid,\(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)).

The decomposition of aspirin (acetylsalicylic acid, \(C_{9} H_{8} O_{4}\)) can occur through the hydrolysis reaction, resulting in the formation of acetic acid (\(CH_{3} COOH\)) and salicylic acid (\(C_{7} H_{6}O_{3}\)). To determine the moles of each product formed, we need to consider the balanced chemical equation for the reaction:

\(C_{9} H_{8} O_{4} = > C_{7} H_{6}O_{3} +CH_{3} COOH\)

From the equation, we can see that for every 1 mole of aspirin, 1 mole of salicylic acid and 1 mole of acetic acid are produced.

Therefore, the moles of salicylic acid and acetic acid formed will be equal to the number of moles of aspirin that decomposes. If we know the amount of aspirin in moles, we can directly calculate the moles of each product based on stoichiometry.

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Explanation

Ionic solids, such as sodium chloride (NaCl) are composed of positive and negative ions that are held together by electrostatic attractions, which can be quite strong.

Many ionic crystals also have high melting points. This is due to the very strong attraction between the ions.

Although they are hard they also tend to be brittle, and they shatter rather than bend. Ionic solids do not conduct electricity; however, they do conduct when molten or dissolved because their ions are free to move. Many simple compounds formed by the reaction of a metal and a nonmetal element are ionic.

Answer: b. Ionic

Answer:

Number of moles = 0.87 mol

Explanation:

Given data:

Mass of calcium = 34.8 g

Number of moles = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of calcium = 40 g/mol

By putting values,

Number of moles = 34.8 g/ 40 g/mol

Number of moles = 0.87 mol

Answer:

131.29 kJ

Explanation:

Let's consider the following balanced equation.

H₂O(g) + C(graphite)(s)  ⇄ H₂(g) + CO(g)

Given the standard enthalpies of formation (ΔH°f), we can calculate the standard enthalpy change for the reaction (ΔH°r) using the following expression.

ΔH°r = 1 mol × ΔH°f(H₂(g)) + 1 mol × ΔH°f(CO(g)) - 1 mol × ΔH°f(H₂O(g)) - 1 mol × ΔH°f(C(graphite)(s))

ΔH°r = 1 mol × (0 kJ/mol) + 1 mol × (-110.53 kJ/mol) - 1 mol × (-241.82 kJ/mol) - 1 mol × (0 kJ/mol)

ΔH°r = 131.29 kJ

However, it is commonly approximated as 3.14159.

An irrational number is a number that cannot be expressed as a simple fraction or ratio of two integers. It is a non-repeating, non-terminating decimal. Examples of irrational numbers include pi (π), the square root of 2 (√2), and the golden ratio (∅).

In mathematics, a terminating decimal is a decimal number that has a finite number of digits after the decimal point, i.e., the decimal representation ends in a finite number of zeroes. For example, 0.75, 2.0, and 0.0625 are terminating decimals.

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The number of CT scans that a patient will have to undergo in order to feel mild radiation sickness would be 72 CT scans

The normal dose CT scan delivers 700 mrem.

700 mrem = 700 x \(10^{-3}\) rem

700 x \(10^{-3}\) rem is equivalent to 0.7 rem.

In order for a patient to feel mild radiation sickness, 50 rem is needed.

If 1 CT scan is equivalent to 0.7 rem, then how many CT scans will give 50 rem?

           = 50 x 1/0.7

                    = 71.429 scans

Since CT scans cannot be a fraction, we then need to approximate to the nearest whole number.

Thus, a total of 72 CT scans will be required for a patient to have a feeling of radiation sickness.

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The minimum concentration of the Cr⁺ that must be added to 0.095 M NaF in order to initiate a precipitate of chromium(III) fluoride, CrF₃ is 7.7 × 10⁻⁸ M.

The equation is as follows :

CrF₃(s)  ⇄  Cr³⁺(aq)   +  3F⁻(aq)

The ksp value for CrF₃ = 6.6 × 10⁻¹¹

The ksp expression is expressed as follows :

ksp = [Cr³⁺] [F⁻]³

[Cr³⁺] = ksp / [F⁻]³

Where

The ksp value = 6.6 × 10⁻¹¹

The value of [F⁻] = 0.095 M

[Cr³⁺] = 6.6 × 10⁻¹¹ / (0.095 )³

[Cr³⁺] = 7.7 × 10⁻⁸ M

Thus the concentration of [Cr³⁺] = 7.7 × 10⁻⁸ M.

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U.S. Census Bureau changed the way it records information about relationships by increasing the number of relationship categories to include same-sex partner options and is denoted as option B.

This is a close connection between people and is characterized by physical or emotional intimacy.

There has been changes in the way U.S. Census Bureau records information is recorded in this aspect by  increasing the number of relationship categories for inclusiveness of other types of people such as those who have same-sex partners and so on.

This is therefore the reason why option B was chosen as the correct choice.

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Answer:

Texture, shape, melting/boiling point, color, smell, density

Explanation:

The informations gathered from effective quantitative and qualitative tests helps a chemist identify an unknown substance. There are many useful technologies helps us to predict the identity of an unknown substance.

A qualitative analysis is the investigation on the quality or identity of a substance. Such as its color, physical properties chemical reactions etc. Similarly and quantitative analysis give us information about the quantity or amount of the substance.

Various laboratory analysis have to be performed systematically to identify a compound or a substance. Further there will be confirmatory tests for our preliminary results.

There are various novel technologies to identify an unknown substance such as spectroscopy, chromatography, XRD etc are really helpful identify a substance based on its structural and functional properties.

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At equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

1: Write the balanced chemical equation:

\(C_O\)(g) + \(Cl_2\)(g) ⟶ \(C_OCl_2\)(g)

2: Set up an ICE table to track the changes in moles of the substances involved in the reaction.

Initial:

\(C_O\)(g) = 0.3500 mol

\(Cl_2\)(g) = 0.05500 mol

\(C_OCl_2\)(g) = 0 mol

Change:

\(C_O\)(g) = -x

\(Cl_2\)(g) = -x

\(C_OCl_2\)(g) = +x

Equilibrium:

\(C_O\)(g) = 0.3500 - x mol

\(Cl_2\)(g) = 0.05500 - x mol

\(C_OCl_2\)(g) = x mol

3: Write the expression for the equilibrium constant (Kc) using the concentrations of the species involved:

Kc = [\(C_OCl_2\)(g)] / [\(C_O\)(g)] * [\(Cl_2\)(g)]

4: Substitute the given equilibrium constant (Kc) value into the expression:

1.2 x \(10^3\) = x / (0.3500 - x) * (0.05500 - x)

5: Solve the equation for x. Rearrange the equation to obtain a quadratic equation:

1.2 x \(10^3\) * (0.3500 - x) * (0.05500 - x) = x

6: Simplify and solve the quadratic equation. This can be done by multiplying out the terms, rearranging the equation to standard quadratic form, and then using the quadratic formula.

7: After solving the quadratic equation, you will find two possible values for x. However, since the number of moles cannot be negative, we discard the negative solution.

8: The positive value of x represents the number of moles of \(Cl_2\)(g) at equilibrium. Substitute the value of x into the expression for \(Cl_2\)(g):

\(Cl_2\)(g) = 0.05500 - x

9: Calculate the value of \(Cl_2\)(g) at equilibrium:

\(Cl_2\)(g) = 0.05500 - x

\(Cl_2\)(g) = 0.05500 - (positive value of x)

10: Calculate the final value of \(Cl_2\) (g) at equilibrium to get the answer.

Therefore, at equilibrium, the number of moles of \(Cl_2\) (g) will be 0.2025 mol.

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An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

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Answer:

Conductometry is a measurement of electrolytic conductivity to monitor a progress of chemical reaction. Conductometry has notable application in analytical chemistry, where conductometric titration is a standard technique.

Conductometric titration is a type of titration in which the electrolytic conductivity of the reaction mixture is continuously monitored as one reactant is added. ... The method can be used for titrating coloured solutions or homogeneous suspension (e.g.: wood pulp suspension), which cannot be used with normal indicators.

Answer:

The correct answer is "430 kJ/kg". A further explanation is given below.

Explanation:

The given values are:

T₁ = 400 k

T₂ = 800 k

The average temperature will be:

= \(\frac{T_1+T_2}{2}\)

= \(\frac{400+800}{2}\)

= \(600 \ k\)

From table,

At 600 k the \(C p\) will be = 1.075

Now,

⇒ The specific enthalpy = \(Cp(T_2-T_1)\)

⇒                                \(\Delta h=1.075 (800-700)\)

⇒                                      \(=430 \ kJ/kg\)

The correct decay series :

₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,  

Decay's reaction :

₈₄Po²¹⁴⇒₈₃Bi²¹⁰+x+y+z

From this decay reaction can be concluded

mass number decreased by 4

atomic number decreased by 1

Then the most suitable are:

Polonium-214 undergoes 1 alpha decay 1 beta decay and 1 gamma emission.

₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰

So that the mass number and atomic number are the same both before and after decay

Answer:

An electrolyte is a substance that produces an electrically conducting solution when dissolved in a polar solvent, such as water. ... A substance that dissociates into ions in solution acquires the capacity to conduct electricity. Sodium, potassium, chloride, calcium, magnesium, and phosphate are examples of electrolytes.

Explanation:

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Answer:

\(\boxed {\boxed {\sf 1.57 \ g \ Pt}}\)

Explanation:

We are asked to find the mass of 4.84 × 10²¹ platinum (Pt) atoms.

First, we convert atoms to moles using Avogadro's Number of 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are platinum atoms. There are 6.022 × 10²³ platinum atoms in 1 mole of platinum.

We will convert using dimensional analysis, so we set up a ratio using the underlined information.

\(\frac {6.022 \times 10^{23} \ atoms \ Pt }{ 1 \ mol \ Pt}\)

We are converting 4.84 × 10²¹ platinum atoms to moles, so we multiply the ratio by this value.

\(4.84 \times 10^{21} \ atoms \ Pt *\frac {6.022 \times 10^{23} \ atoms \ Pt }{ 1 \ mol \ Pt}\)

Flip the ratio so the units of atoms of platinum cancel.

\(4.84 \times 10^{21} \ atoms \ Pt *\frac{ 1 \ mol \ Pt} {6.022 \times 10^{23} \ atoms \ Pt }\)

\(4.84 \times 10^{21} *\frac{ 1 \ mol \ Pt} {6.022 \times 10^{23} }\)

\(\frac{4.84 \times 10^{21} } {6.022 \times 10^{23} } \ mol \ Pt\)

\(0.008037196945 \ mol \ Pt\)

Next, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. It is found on the Periodic Table because it is equal to the atomic mass, but the units are grams per mole instead of atomic mass units.

Look up the molar mass of platinum.

Set up another ratio using the molar mass.

\(\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}\)

We multiply the ratio by the number of moles we calculated.

\(0.008037196945 \ mol \ Pt * \frac{195.08 \ g \ Pt}{ 1 \ mol \ Pt}\)

The units of moles of platinum cancel.

\(0.008037196945 * \frac{195.08 \ g \ Pt}{ 1 }\)

\(0.008037196945 * {195.08 \ g \ Pt}\)

\(1.56789638 \ g \ Pt\)

The original value of atoms has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 7 in the thousandth place tells us to round the 6 up to a 7.

\(1.57 \ g \ Pt\)

4.84 × 10²¹ platinum atoms have a mass of 1.57 grams.

Answer:

Condensation reaction/ direct synthesis reaction

Explanation:

Combines simple molecules to form complex molecules producing water

Non-renewable resources are resources found by humans as a source of energy and such resources cannot be replenished. Therefore such resources should not be wasted.

The earth is rich in resources. Some are unlimited others are inherently limited. Renewable resources are unlimited and can be replenished. However non-renewable resources are finite and must be used carefully to ensure long-term use for future generations. Wood is a renewable resource. This means you can grow additional resources in place of felled wood.

Non-renewable energy comes from resources that are depleted or not replenished over and over again throughout our lifetime. Most non-renewable energy sources are fossil fuels such as coal oil and natural gas. Carbon is the main element of fossil fuels. Air and water are also renewable natural resources. They don't grow like trees or have babies like animals. But they are constantly updated. They move cyclically.

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The Average atomic mass of phosphorus is 29.9.

The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element.

Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.

An element can have differing numbers of neutrons in its nucleus, but it always has the same number of protons.

The versions of an element with different neutrons have different masses and are called isotopes.

The average atomic mass for an element is calculated by summing the masses of the element’s isotopes, each multiplied by its natural abundance on Earth i.e,

Average atomic mass of P = ∑(Isotope mass) (its abundance)

∴ Average atomic mass of P = (P-29 mass) (its abundance) + (P-30 mass)(its abundance) + (P-31 mass) (its abundance) + (P-33 mass) (its abundance)

Abundance of isotope = % of the isotope / 100.

∴ Average atomic mass of P = (29)(0.327) + (30)(0.4803) + (31)(0.184) + (33)(0.0087) = 29.88 a.m.u ≅ 29.9 a.m.u.

Hence , The Average atomic mass of phosphorus is 29.9.

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Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

The molecular orbital that results will be a bonding orbital.Removing an electron from the resulting orbital will decrease bond order.The molecular orbital that results will have sigma symmetry.form when two atomic orbitals combine.

Atomic orbitals are mathematical structures that shed light on the wave-like behavior of the electrons (or pairs of electrons) that surround an atom's nucleus. These mathematical operations are frequently used in the domains of quantum mechanics and atomic theory to calculate the likelihood of finding an electron (belonging to an atom) at a particular area surrounding the atom's nucleus.It is crucial to remember that the phrase "atomic orbital" may also be used to describe the area or space surrounding an atom's nucleus where the likelihood of a particular electron being there is highest. The mathematical representation of the atomic orbital predicts the presence of an electron in such a location.

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The average seismic wave speeds at a depth of 90 km in volcanic areas, They typically travel at speeds ranging from 1 to 14 km/h. The slower values represent a P-wave traveling in water, while the higher numbers represent a P-wave speed near the Earth's mantle's core.

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Answer:

See explanation

Explanation:

The shorthand nuclear reaction equations have been given; the first particle in the parentheses is a reactant particle while the second particle is a product particle. These can now be rewritten as the longhand equations as follows;

238/92U + 4/2 He -------> 241/94Pu + 1/0 n

238/92U + 4/2 He ------> 241/94Pu + 1/0 n

14/7N + 4/2 He------> 17/8O + 1/1 p

56/26Fe + 2 4/2 He----> 60/29Cu + 4/2 He

The susbstance \(C2H5OH\) has the highest boiling point. Thus, option B is correct.

A physical property is the characteristic of a substance or compound that is observed without any change in the identity of the particular substance. The physical properties of a substance is its colour, hardness, density, and melting as well as boiling points.

A physical property is a characteristic of matter that involves in physical change and physical changes are reversible and there is no production of any new substance.The chemical change is the property of a substance due to which new substances are formed and it is non reversible change.The chemical properties are flammability, toxicity, heat of combustion, coordination number, enthalpy of formation, and oxidation states.

Therefore, the susbstance \(C2H5OH\) has the highest boiling point. Thus, option B is correct.

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Answer:

the answer is (a)

Explanation:

an example of +1 oxidation state is Cu2O, where oxygen is 2- and so to balance the molecule, each copper atom is +1

Answer:

Na:[He]3s¹

Explanation:

[He] => core structure => Helium ([He]1s²)

3 => principle energy level of valence electrons

s => orbital geometry of valence structure => spherical

s¹ => orbital orientation of valence structure => 1 orientation for sphere

superscript 1 => 1 unpaired electron in orbital