94.9 grams of Br is equivalent to how many moles of Br?

Answer:

A possible element with ns2np4 valence orbital is Oxygen(O)
A element that has the most electronegativity and soft is flourine(F)
for part C, it is scandium (Sc) with the last electron filled in the 3d orbital

Number of second in human lives in scientific notation is 3.9 × 10⁷ second

Given that;

Average human lives = 74 years

Find:

Number of second in human lives in scientific notation

Computation:

Number of second in human lives in scientific notation = 74 × 365 × 24 × 60

Number of second in human lives in scientific notation = 38,894,400

Number of second in human lives in scientific notation = 3.9 × 10⁷ second

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The element among the options which is liquid at the room temperature is Bromine (Br) [Atomic Number = 35].

The chemical element bromine has the atomic number 35 and the symbol Br. It is the third lightest element in group 17 of the periodic table (halogens), and at room temperature, it is a volatile red-brown liquid that readily evaporates to form a vapor of a similar color. Its characteristics fall in between those of iodine and chlorine. It was discovered separately by two chemists, Carl Jacob Löwig (1825) and Antoine Jérôme Balard (1826), and was given the name o (bromos), which refers to its acrid and strong odour in Ancient Greek.

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The concentration of H₂ in the water is 0.25ˣ  10⁴mol/ml.  of partial pressure of sealed container is 2.0atm.

In actual science, Henry's law is a gas regulation that expresses that how much broke down gas in a fluid is straightforwardly corresponding to its halfway tension over the fluid. The proportionality factor is called Henry's regulation steady. It was figured out by the English scientific expert William Henry, who concentrated on the point in the mid nineteenth 100 years.

A model where Henry's law is impacting everything is in the profundity subordinate disintegration of oxygen and nitrogen in the blood of submerged jumpers that changes during decompression, prompting decompression ailment. An ordinary model is given by one's involvement in carbonated sodas, which contain broke down carbon dioxide. Prior to opening, the gas over the beverage in its compartment is practically unadulterated carbon dioxide, at a tension higher than barometrical strain. After the container is opened, this gas evades, moving the fractional strain of carbon dioxide over the fluid to be a lot of lower, bringing about degassing as the broke up carbon dioxide emerges from the arrangement.

We know that according to henry law,

P=kA where p is partial pressure,k is henry constant and A is the concentration of reactants.

So,we have k=7.8ˣ10⁻⁴atm-ml/mol,P=2atm,A=?

On,putting value in above formula,we get

=>2=7.8ˣ10⁻⁴ ˣ A

=>A=2/7.8ˣ10⁻⁴

=>A=20/78 ˣ 10⁴

=>A=0.25ˣ  10⁴mol/ml.

Hence, concentration of H₂ is 0.25ˣ  10⁴mol/ml.

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Answer: May's full moon or Flower moon

Explanation:

To solve such this we must know the concept of combination reaction. Therefore, the given reaction CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr is a combination reaction.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

CH\(_4\)+Br\(_2\) \(\rightarrow\)CH\(_3\)Br+ HBr

The above reaction is a combination reaction. In combination reaction, more than one reactant combine to form a product. Because new chemicals are created during combination reactions, they are often referred to as synthesis.

Therefore, the given reaction is a combination reaction.

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"Spherical: Bacteria shaped like a ball are called cocci, and a single bacterium is a coccus. Examples include the streptococcus group, responsible for “strep throat.”

Rod-shaped: These are known as bacilli (singular bacillus). ...

Spiral: These are known as spirilla (singular spirillus). " - Medical News Today

We are given a sample of an unknown alkali metal hydroxide, and are being asked it's molar mass. If we were to consider this alkali metal hydroxide with HCl ( hydrochloric acid ), the following reaction would take place -

hydrochloric acid + sodium hydroxide → sodium chloride + water

Let me rewrite this reaction with respect to the " lettering " of the compounds,

HCl + MOH → MCl + H2O

M is replaced with the alkaline metal sodium in this case. From that, you can tell that this unknown alkali metal hydroxide is sodium hydroxide.

To solve for the number of moles of HCl, we can do the following -

n = C * V = 2.5 * 0.017 = 0.0425 moles,

n( MOH ) = n( HCl ) = 0.0425 moles

Using the formula n = m / M -

Molar Mass = m / n = 4.36 / 0.0425 ≈ 103 grams / mole

Solution = ( About ) 103 grams / moles of hydroxide

Answer:

The number of molecules of water us 1.50× 10²⁵ molecules

Explanation:

From N=nL

where L =avogadro number ( 6.02× 10^²³ entities)

The number of the molecules of water =1

n (amount of substance)=25 moles

hence (N) = 25×1×6.02×10^²³

=1.50×10²⁵ molecules of H2O

The observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

From the observation that the hole in the window is smaller on the outside than on the inside, Becca, as a forensic technician, might deduce the following:

The hole was caused by an impact from the outside: The smaller outside hole suggests that the force that created the hole originated from the outside and exerted more pressure on the window surface facing inward.

The object causing the hole was larger on the inside: The discrepancy in hole sizes implies that the object that struck the window had a larger size or diameter on the inside, and as it penetrated the glass, it compressed or fragmented the glass, resulting in a larger hole on the inside.

The object may have passed through the window: The difference in hole sizes indicates that the object may have penetrated the window, potentially passing through to the inside. This could suggest a break-in or an incident involving the window being struck from the outside.

Overall, the observation of a smaller outside hole than inside leads Becca to infer that an impact from the outside caused the hole, with a larger object striking and passing through the window from the inside.

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Step 1

The mass of I-131 left in the body could be calculated as follows:

--------

Step 2

Data provided:

M = 5 μg (1 g = 1000000 μg) => 5 μg x (1 g/1000000 μg) = 5x10^-6 g

Mo = 5 g

Half-life = 8 hours = 8 h

-------

Step 3

Procedure:

Answer: t = 159 h (approx.)

The mass percent of the sodium chloride in the saline solution is approximately 1.33%. The molar concentration of the saline solution is approximately 0.229 M.

To determine the mass percent and molar concentration of the saline solution, we need to analyze the mass of the sodium chloride residue and the initial mass of the sample.

Mass percent:

The mass percent is calculated by dividing the mass of the sodium chloride residue by the initial mass of the sample and then multiplying by 100%.

Mass percent = (Mass of NaCl / Initial mass of sample) × 100%

Mass of NaCl = 0.669 g

Initial mass of sample = 50.320 g

Mass percent = (0.669 g / 50.320 g) × 100% ≈ 1.33%

The mass percent of the sodium chloride in the saline solution is approximately 1.33%.

Molar concentration:

To calculate the molar concentration of the saline solution, we need to determine the number of moles of sodium chloride and the volume of the solution.

Moles of NaCl = Mass of NaCl / Molar mass of NaCl

The molar mass of NaCl is 58.44 g/mol.

Moles of NaCl = 0.669 g / 58.44 g/mol ≈ 0.01144 mol

Since the volume of the sample is given as 50.0 mL, we need to convert it to liters.

Volume of solution = 50.0 mL = 50.0 mL × (1 L / 1000 mL) = 0.0500 L

Now we can calculate the molar concentration (Molarity) using the formula:

Molarity (M) = Moles of solute / Volume of solution (in liters)

Molarity = 0.01144 mol / 0.0500 L ≈ 0.229 M

The molar concentration of the saline solution is approximately 0.229 M.

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Answer: The \(K_{sp}\) value for calcium hydroxide at this temperature is \(1.08 \times 10^{-4}\).

Explanation:

Given: Mass of \(Ca(OH)_{2}\) = 0.225 g

Volume = 0.100 L

As moles is the mass of substance divided by its molar mass.

So, moles of \(Ca(OH)_{2}\) (molar mass = 74 g/mol) is calculated as follows.

\(Moles = \frac{mass}{molar mass}\\= \frac{0.225 g}{74 g/mol}\\= 0.003 mol\)

Molarity is the number of moles of substance present in a liter of solution.

Hence, molarity of given solution will be as follows.

\(Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.003 mol}{0.1 L}\\= 0.03 M\)

The equation for dissociation of  \(Ca(OH)_{2}\) is as follows.

\(Ca(OH)_{2} \rightarrow Ca^{2+} + 2OH^{-}\)

This means that \([Ca^{2+}] = 0.03\) and \([OH^{-}] = 2 \times 0.03 = 0.06\). Hence, \(K_{sp}\) value for this reaction is calculated as follows.

\(K_{sp} = [Ca^{2+}][OH^{-}]^{2}\\= (0.03) \times (0.06)^{2}\\= 1.08 \times 10^{-4}\)

Thus, we can conclude that the \(K_{sp}\) value for calcium hydroxide at this temperature is \(1.08 \times 10^{-4}\).

Answer:

D2 has 1 neutron

and 1 proton

Answer:

\(P=3.33atm\)

Explanation:

Hello!

In this case, since know the volume, temperature and pressure of the initial containers, we can compute the moles of each gas prior to the opening of the valve as shown below:

\(n_{Ne}=\frac{6atm*4L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.981molNe\\\\n_{Ar}=\frac{2atm*8L}{0.08206\frac{atm*L}{mol*K}*298.15K} =0.654molAr\)

Next, we add them up to obtain the total moles:

\(n_T=0.981mol+0.654mol=1.635mol\)

Now, the total volume:

\(V_T=4.00L+8.00L=12.00L\)

Finally, the total pressure is computed by using the ideal gas equation:

\(P=\frac{1.635mol*0.08206\frac{atm*L}{mol*K}*298.15K}{12.00L}\\\\P=3.33atm\)

Best regards!

Answer:Compounds are chemical substances that contain more than one element. They're created during a chemical reaction where atoms are rearranged into new compound molecules. For example, if carbon atoms react with oxygen atoms they form carbon dioxide molecules.

Explanation:

The sample contains 0.986 g of Carbon, 0.107 g of Hydrogen, 0.579 g of Nitrogen, and 0.328 g of Oxygen. This elemental composition matches that of MDMA and not caffeine. There are 0.0099 moles of MDMA present in the sample.

Nitrogen is a colorless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78% of Earth's atmosphere. It is the most abundant element in the atmosphere, and is chemically unreactive under normal conditions. It is an essential element in all forms of life, and is a major component in amino acids and proteins. Nitrogen is also found in all plant and animal tissues, and is a necessary nutrient for their growth.

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Answer:

Electrical

Explanation:

The ratio of neutrons to protons, or the N/Z ratio, plays a crucial role in determining a nucleus' stability. The range of N/Z ratios in which nuclei are stable is generally referred to as the belt of stability.

If the forces between the constituents of the nucleus are equal, an atom is stable. If these forces are out of balance or if the nucleus has an excessive amount of internal energy, an atom is unstable (radioactive).

Z = 104 for Rutherfordium, element 104. The isotopes 261Rf and 262Rf, having masses of 261 and 262, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

261Rf: N/Z = (261-104)/157 = 1.08

262Rf: N/Z = (262-104)/158 = 1.09

These N/Z ratios are a little bit higher than the average belt of stability values, which are about 1.0 for heavy nuclei. These isotopes are thought to be reasonably stable because they are close enough.

Z = 109 for Meitnerium, element 109. The isotopes 278Mt and 282Mt, with masses of 278 and 282, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

278Mt: N/Z

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Answer:

1. Molecular equation

BaCl2(aq) + 2AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

2. Complete Ionic equation

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯(aq)

3. Net ionic equation

Cl¯(aq) + Ag⁺(aq) —> AgCl(s)

Explanation:

1. Molecular equation:

BaCl2(aq) + AgNO3(aq) –> AgCl(s) + Ba(NO3)2 (aq)

The above equation can be balance as follow:

There are 2 atoms of Cl on the left side and 1 atom on the right side. It can be balance by putting 2 in front of AgCl as shown below:

BaCl2(aq) + AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

There are 2 atoms of Ag on the right side and 1 atom on the left side. It can be balance by putting 2 in front of AgNO3 as shown below:

BaCl2(aq) + 2AgNO3(aq) –> 2AgCl(s) + Ba(NO3)2 (aq)

Now, the equation is balanced

2. Complete ionic equation

In solution, BaCl2 and AgNO3 will dissociate as follow:

BaCl2(aq) —> Ba²⁺(aq) + 2Cl¯(aq)

AgNO3(aq) —> Ag⁺(aq) + NO3¯ (aq)

BaCl2(aq) + AgNO3(aq) –>

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯

3. Net ionic equation

Ba²⁺(aq) + 2Cl¯(aq) + 2Ag⁺(aq) + 2NO3¯ (aq) —> 2AgCl(s) + Ba²⁺(aq) + 2NO3¯(aq)

Cancel out the spectator ions i.e ions that appears on both side of the equation in order to get the net ionic equation. This is illustrated below:

2Cl¯(aq) + 2Ag⁺(aq) —> 2AgCl(s)

Cl¯(aq) + Ag⁺(aq) —> AgCl(s)

1. Molecular equation: \(BaCl_2(aq) + 2 AgNO_3(aq) \rightarrow 2 AgCl(s) + Ba(NO_3)_2(aq)\)

2. Complete Ionic equation:\(Ba^{2+} (aq)+ 2Cl^- (aq) + 2 Ag^+ (aq) + 2NO_3^-(aq) \rightarrow2AgCl(s) + Ba^{2+}(aq) + 2 NO_3^-(aq)\)3. Net ionic equation: \(Cl^- (aq) + Ag^+ (aq) \rightarrow AgCl(s)\)

1. Molecular equation:

\(BaCl_2(aq) + AgNO_3(aq) \rightarrow AgCl(s) + Ba(NO_3)_2(aq)\)

There are two Cl atoms on the left side and one on the right. Balance can be achieved by adding 2 in front of AgCl, as seen below:

\(BaCl_2(aq) + 2AgNO_3(aq) \rightarrow AgCl(s) + Ba(NO_3)_2(aq)\)

There are two Ag atoms on the right side and one on the left. It is possible to achieve equilibrium by adding 2 in front of \(AgNO_3\), as demonstrated below:

\(BaCl_2(aq) + 2 AgNO_3(aq) \rightarrow 2 AgCl(s) + Ba(NO_3)_2(aq)\)

2. Complete ionic equation

\(BaCl_2\) and \(AgNO_3\) will dissociate in solution as follows:

\(BaCl_2(aq) \rightarrow Ba^{2+}(aq) + 2Cl^-(aq)\)

\(AgNO_3(aq) \rightarrow Ag^+ (aq) + NO_3^-(aq)\)

\(Ba^{2+} (aq)+ 2Cl^- (aq) + 2 Ag^+ (aq) + 2NO_3^-(aq) \rightarrow2AgCl(s) + Ba^{2+}(aq) + 2 NO_3^-(aq)\)

3. Net ionic equation

To obtain the net ionic equation, cancel out the spectator ions, which are ions that appear on both sides of the equation. As an example, consider the following:

\(2Cl^-(aq) + 2Ag^+(aq) \rightarrow 2AgCl(s)\)

\(Cl^-(aq) + Ag^+(aq) \rightarrow AgCl(s)\)

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The ΔHrxn for the neutralization reaction between aqueous NaOH and HCl is -994.6 kJ/mol HCl.

Given that A 100.0 mL sample of 0.255 M NaOH is mixed with a 100.0 mL sample of 0.200 M HCl in a coffee cup calorimeter.  Both solutions were initially at 20.00°C and the temperature of the resulting solution was recorded as 37.00°C.  

We are to determine the ΔHrxn (in units of kJ/mol HCl) for the neutralization reaction between aqueous NaOH and HCl.  The balanced chemical equation for the neutralization reaction between aqueous NaOH and HCl is

 NaOH (aq) + HCl (aq) → NaCl (aq) + H2O  

(l)First, we need to determine the limiting reactant. It is necessary to identify the limiting reactant in order to calculate the moles of HCl reacted in the reaction and use it to determine ΔHrxn.  

Limiting reagent is the reactant that will be completely used up first, stopping the reaction. The reactant that is not completely consumed is the excess reactant.

We can use the concept of Stoichiometry to identify the limiting reactant.  To determine the limiting reactant, we can use the following formula:  

Molarity (M) = moles of solute (mol) / liters of solution (L) For NaOH, molarity (M) = 0.255 M For HCl, molarity (M) = 0.200 M.

Let's calculate the moles of NaOH and HCl:

Moles of NaOH = Molarity (M) × Volume (L)Moles of NaOH = 0.255 M × 0.100 L = 0.0255 mol

Moles of HCl = Molarity (M) × Volume (L)

Moles of HCl = 0.200 M × 0.100 L = 0.0200 mol

As we can see, the number of moles of NaOH is more than the number of moles of HCl.   NaOH is present in excess, while HCl is limiting.

The amount of HCl determines how much NaOH reacts, so we will use the number of moles of HCl to determine ΔHrxn.Next, we can calculate the amount of heat absorbed by the reaction:

qrxn = – qcal where qrxn = heat absorbed by the reactionqcal

= heat released by the calorimeterqcal

= (mass of water + mass of calorimeter) × specific heat of water × ΔTqcal = (200.0 g + 50.0 g) × 4.184 J/g·°C × (37.00°C – 20.00°C)

= 19,892 J or 19.892 kJqrxn

= – 19.892 kJ  (because no heat is lost to the calorimeter or the surroundings)

Next, we can use the equation below to calculate ΔHrxn:ΔHrxn = qrxn / n ΔHrxn = -19.892 kJ / (0.0200 mol × (-1)) = 994.6 kJ/mol HCl (Negative sign indicates that the reaction is exothermic).

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Pyrolysis is the most popular recycling method for recovering carbon fiber from composite trash because it essentially burns off the resin at high temperatures.

It has long been asserted that solvolysis, which dissolves the resin using a solvent, offers superior qualities.

The Cycle of Carbon

Plants absorb carbon from the atmosphere.

Animals and plants both absorb carbon.

Animals and vegetation release carbon into the soil.

Living beings release carbon into the atmosphere.

When fuels are burned, carbon is released from fossil fuels into the atmosphere.

Oceans receive carbon from the atmosphere.

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Answer:

Explanation:

Answer:

warmed by the Earth's surface

the lowest layer

Explanation:

Answer:

14

Explanation:

Neutrons are neutral and if there are no electrons to cancel out the protons you add the neutrons and protons together

Answer:

800

Explanation:

took the test and got it right

The numbers represent the change in energy for a chemical reaction. They are calculated by subtracting the energy of products from the energy of reactants. 800 would result from an endothermic reaction.Therefore, the correct option is D.

There are different types of reactions, such as the endothermic reaction, where the energy is used for the product's formation, and the exothermic reaction.

The energy is released in an exothermic reaction, resulting in a negative result, whereas the energy is used in an endothermic reaction, resulting in a positive result.

Any chemical reaction that absorbs heat from its surroundings is an endothermic reaction. The absorbed energy serves as the activation energy for the reaction to take place.

Thus, 800 would result from an endothermic reaction, the correct option is D.

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Your question is incomplete, most probably your question was

The numbers represent the change in energy for a chemical reaction. They are calculated by subtracting the energy of products from the energy of reactants. Which number would result from an endothermic reaction?

–212

0

-1

800

In this letter, express gratitude to your uncle, a university professor, for his invitation and congratulate him on his achievements.

Here are the steps to be followed:

By following these steps, you can write a thoughtful and appreciative letter to your uncle, expressing your gratitude for his invitation and congratulating him on his achievements.

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Answer:

because the force depends upon the product of both masses and the square of the distance between them, whereas the planet's acceleration depends on just the mass of the Sun and the square of the distance between the Sun and planet.