Which of the following has the highest mass? A) 1 mole Ar B) 1 mole He C) 1 mole Ne D) 1 mole Kr

Answer: 13.5 minutes to run 3.2 km.

Explanation: To solve this problem, you need to convert the distance from kilometers to miles and the speed from miles per hour to kilometers per hour. 3.2 km is approximately 1.988 miles and 5.5 mph is approximately 8.851 kph. To find the time it takes to run 1.988 miles at 8.851 kph, you can use the formula time = distance ÷ speed. Plugging in the values, you get time = 1.988 miles ÷ 8.851 kph, which simplifies to approximately 0.225 hours or 13.5 minutes.

Therefore, it will take the student approximately 13.5 minutes to run 3.2 km.

Answer:

1) Oxidation-Reduction (Redox) Reaction

2) Combustion Reaction

3) Decomposition Reaction

4) Synthesis Reaction

5) Single Displacement (Substitution) Reaction

6) Double Displacement (Metathesis) Reaction

7) Acid-Base Neutralization Reaction

8) Precipitation Reaction

Here are the Answer:

1. Oxidation-Reduction (Redox) Reaction

2. Combustion Reaction

3. Decomposition Reaction

4. Synthesis Reaction

5. Single Displacement (Substitution) Reaction

6. Double Displacement (Metathesis) Reaction

7. Acid-Base Neutralization Reaction

8. Precipitation Reaction

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The final pressure of the gas of initial pressure 275 torr is 550 torr.

Pressure is the force acting normally per unit area to the surface of an object

To caluclate the final pressure of the balloon, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the final pressure is 550 torr.

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Answer:

I think you should go read up on the periodic table

Answer:

a. Student A has results that are neither precise nor accurate.

b. Student B has results that are both precise and accurate.

c. Student C has results that are precise but not accurate.

Explanation:

First, let's remember the concepts of accuracy and precision:

Accuracy is a measure of how close a measurement is to the correct or accepted value of the quantity being measured.

Precision is a measure of how close a series of measurements are to one another.

You can see this better in the following picture:

Based on this logic, you can note that:

- The results of Student A are not accurate and are not precise.

- The results of Student B are very close to each other which is precise and in turn, they are close to the real value which is very accurate.

- The results of Student C are very close to each other which is precise but it isn't close to the real value, so it isn't accurate.

The answers would be:

a. Student A has results that are neither precise nor accurate.

b. Student B has results that are both precise and accurate.

c. Student C has results that are precise but not accurate.

Answer:

42 grams

Explanation:

the conversion between moles and grams is by using the molar mass of the substance.

The molar mass for a nitrogen atom is 14.00 g/mol.

N2 has two nitrogen atoms, so its molar mass is 28.00 g/mol

To find how many grams are in 1.5 moles;

                                           \(28g/mol*1.5mol\)

the units of mols cancels out, leaving one with units of grams of N2

The  AIR MASSES that would affect the climates of Florida : are maritime tropical air mass and the maritime polar air mass,

Maine : maritime polar air mass and maritime tropical air mass,

Montana :  continental polar and maritime polar air masses.

Texas :  maritime tropical air masses  and continental tropical air masses

An air mass is  described as a large body of air with generally uniform temperature and humidity.

An air mass's properties are determined by the region from which it originates. The likelihood that the air mass will take on characteristics of the surface below increases with the amount of time it spends over its source region.

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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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The reducing agent in the reaction shown would be \(H_2O\).

Reducing agents are chemical substances that perform one of the following:

They are opposed to oxidizing agents which:

Looking at the reaction, the \(H_2O\) molecule reduces \(HClO_3\) molecules to HClO by removing oxygen. Hence, it is the reducing agent.

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Answer:

\(\boxed{From \ +6 \ to \ 0}\)

Explanation:

2 Fe2O3(s) + 3 C(s) → 4 Fe(s) + 3 CO2(g)

In the given reaction, Iron in the reactants side have the oxidation number of +6. This is because \(O_{3}\) with \(Fe_{2}O_{3}\) has oxidation state -6, So any atom with it would have an oxidation state of +6 to give the resultant of zero.

In the products side, Iron acts as a free element reacting with no other atom. So, as per the rule of oxidation states, the oxidation state of Iron in the products side will be zero.

So, the oxidation number changes from +6 to 0 .

Extra Info: Decrease in oxidation state is Reduction , So Iron is being reduced here.

The change in the oxidation number of the iron atom in the reaction is from +3 to 0

Oxidation is simply defined as the the loss of electron. However, Oxidation number simply talks about the number of electrons that is either gained or lossed during bond formation.

The change in the oxidation number of iron in the reaction can be obtained as follow:

2Fe₂O₃(s) + 3C(s) → 4Fe(s) + 3CO₂(g)

Oxidation number of Fe₂O₃ = 0 (ground state)

Oxidation number of oxygen = –2

Fe₂O₃ = 0

2Fe + 3O = 0

2Fe + 3(–2) = 0

2Fe – 6 = 0

Collect like term

2Fe = 6

Divide both side by 2

Fe = 6/2

Thus, the oxidation number of Fe in Fe₂O₃ is +3

Therefore, the change in the oxidation number of the iron, Fe, atom in the reaction is from +3 to 0

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The reagents that will not react with benzene by electrophilic aromatic substitution are Sulfur trioxide (SO₃), Chlorine (Cl₂).

Electrophilic aromatic substitution is a type of organic reaction in which an electrophile (a positively charged or electron-deficient species) replaces a hydrogen atom in an aromatic ring via an electrophilic attack. This type of reaction is a characteristic feature of aromatic compounds, which are cyclic compounds that contain one or more benzene rings or similar aromatic rings.

In electrophilic aromatic substitution, the electrophile reacts with the aromatic ring in the presence of a Lewis acid catalyst (such as aluminum chloride or iron(III) chloride) to generate a positively charged intermediate called Arenium ion. The Arenium ion then undergoes a series of rearrangements to produce the final product.

There are several types of electrophilic aromatic substitution reactions, including nitration, halogenation, sulfonation, Friedel-Crafts alkylation, and Friedel-Crafts acylation. Each type of reaction involves a different electrophilic reagent and follows a unique mechanism, but all involve the initial electrophilic attack on the aromatic ring and subsequent rearrangements.

Electrophilic aromatic substitution is an important class of reactions in organic chemistry and is used in the synthesis of a wide variety of organic compounds, including pharmaceuticals, agrochemicals and materials.

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The correct answer is A.

The nuclear equation that correctly characterizes a nuclear reaction is one where the sum of the atomic numbers and the sum of the mass numbers on both sides of the equation are equal.

\(_{92}^{235}\textrm{U}+_{0}^{1}\textrm{n}\rightarrow _{54}^{140}\textrm{Xe}+_{38}^{94}\textrm{Sr}+3_{0}^{1}\textrm{n}\)

         \(_{92}^{235}\textrm{U}+_{0}^{1}\textrm{n}\rightarrow _{54}^{140}\textrm{Xe}+_{38}^{94}\textrm{Sr}+3_{0}^{1}\textrm{n}\)

The correct answer is A.

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The molality of the sodium ions and the sulfate ions are  44.5 and 10.66 respectively.

How do you calculate molality?

The total number of moles of solute per litre of solution is defined as the molarity of a specific solution. Because, unlike mass, the volume of a system changes with changes in physical circumstances of the system, the molality of a solution is reliant on changes in physical qualities of the system such as pressure and temperature. M, which stands for molarity, represents molarity. The molarity of a solution is one molar when one gramme of solute is dissolved in one litre of solution. As we know, the solvent and solute combine to create a solution, hence the total volume of the solution is measured.

molality of sodium was

=480.57/10.781

=44.5

molality of sulfate was

=28.93/2.712

=10.66

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Answer:

To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.

Explanation:

Answer:

Explanation:

Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided

Answer:29.232

Explanation:6.023x10^23

Answer:

The student measured the cup and got an incorrect answer

Explanation:

because he was in a rush.

Answer: B. It exposes more of the solute to the water molecules.

Explanation:

Rate of a reaction is dependent on following factors:

a) adding a catalyst: Adding a catalyst increases the rate of reaction

b) reducing the surface area: The rate of the reaction will decrease by reducing the surface area

c) raising the temperature: Increasing the temperature increases the rate of the reaction.

d) increasing the amount of reactants : Increasing the amount of reactants increases the rate of reaction.

If the reactants are present in smaller size, more reactants can react as decreasing the size increases the surface area of the reactants which will enhance the contact of molecules. Hence, more products will form leading to increased rate of reaction.

Thus reducing solute particle size increase the speed at which the solute dissolves in water by exposing more of the solute to the water molecules.

Answer:

B. It exposes more of the solute to the water molecules.

Answer:

How many water molecules would be produced in making a polypeptide that is 72 amino acids long by dehydration reactions? 71; one less than the number

Explanation:

If a strong base is added to a buffer the pH will change only slightly. In the non-buffered solution changing the pH significantly.

If a strong base is added to a buffer, the weak acid will give up its H+ in order to transform the base (OH-) into water (H2O) and the conjugate base: HA + OH- → A- + H2O. Since the added OH- is consumed by this reaction, the pH will change only slightly.

In the non-buffered solution, the added hydronium or hydroxide ions have nothing to react with so the concentrations increase rapidly, changing the pH significantly.  If a base is added to an acidic solution, the solution becomes less acidic and moves toward the middle of the pH scale.

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Answer:

Ag⁺ (aq) + I¯ (aq) —> AgI (s)

Explanation:

We'll begin by writing the dissociation equation for aqueous AgNO₃ and KI.

Aqueous AgNO₃ and KI will dissociate in solution as follow:

AgNO₃ (aq) —> Ag⁺(aq) + NO₃¯ (aq)

KI (aq) —> K⁺(aq) + I¯(aq)

Aqueous AgNO₃ and KI will react as follow:

AgNO₃ (aq) + KI (aq) —>

Ag⁺(aq) + NO₃¯ (aq) + K⁺ (aq) + I¯(aq) —> AgI (s) + K⁺ (aq) + NO₃¯ (aq)

Cancel out the spectator ions (i.e ions that appears on both sides of the equation) to obtain the net ionic equation. The spectator ions are K⁺ and NO₃¯.

Thus, the net ionic equation is:

Ag⁺ (aq) + I¯ (aq) —> AgI (s)

The net ionic equation of aqueous solutions of \(AgNO_3\) and \(KI\) to form \(AgI\) precipitates is: B. \(Ag^{+}_{(aq)} + I^{-}_{(aq)}\) -----> \(AgI_{(s)}\)

A balanced chemical equation can be defined as a chemical equation wherein the number of atoms on the reactant (left) side is equal to the number of atoms on the product (right) side.

This ultimately implies that, both the charge on each atom and sum of the masses of the chemical compounds or elements in a chemical equation are properly balanced.

An ion can be defined as an atom or molecules (group of atoms) that has lost or gained one or more of its valence electrons, thereby, making it have a net positive or negative electrical charge.

First of all, we would write the dissociation equation for aqueous solutions of \(AgNO_3\) and \(KI\):

For \(AgNO_3\):

\(AgNO_3_{(aq)}\) -----> \(Ag^{+}_{(aq)} + NO_{3}^{-}_{(aq)}\)

For \(KI\):

\(KI_{(aq)}\) -----> \(K^{+}_{(aq)} + I^{-}_{(aq)}\)

Next, we would write a chemical equation for the reaction of aqueous solutions of \(AgNO_3\) and \(KI\):

\(AgNO_3_{(aq)} + KI_{(aq)}\)  -----> \(Ag^{+}_{(aq)} + NO_{3}^{-}_{(aq)}\) \(+ \;K^{+}_{(aq)} + I^{-}_{(aq)}\) ----->\(AgI_{(s)} + K^{+}_{(aq)} + NO_{3}^{-}_{(aq)}\)

Note: Spectator ions refers to the ions that exist as a reactant and a product in a chemical equation because they are unchanged by the chemical reaction.

In this chemical reaction, the spectator ions are:

Finally, in order to obtain the net ionic equation, we would cancel out the two (2) spectator ions:

\(Ag^{+}_{(aq)} + I^{-}_{(aq)}\) -----> \(AgI_{(s)}\)

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Answer: it’s B!! :)

Answer:

D

Explanation:

This creates a gap that we call an oceanic trench

:)

When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.

When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.

The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.

Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.

In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.

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Answer:

Balls

Explanation:

Cuz

Answer:

Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.

Water is a Polar Covalent Molecule

The unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that a water molecule has two poles - a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side).

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