A weather balloon at Earth’s surface has a
volume of 4 L at 275 K and 760 mm Hg. If
the balloon is released and the volume reaches
4.13 L at 704 mm Hg, what is the temperature?
Answer in units of K.

Answer:

sodium chloride

Explanation:

Sodium chloride is an ionic compound having sodium and chloride ions in its structure. Ionic compounds do not conduct electricity in solid state but they conduct electricity in aqueous solution and in molten state.Hence this property is shown by sodium chloride.

Explanation:

sodium chloride is an ionic compound

The 20.16 grams of magnesium oxide is formed in this reaction.

To determine the mass of magnesium oxide formed in the reaction, we need to calculate the limiting reactant and then use the stoichiometry of the balanced chemical equation to find the corresponding mass of the product.

The balanced chemical equation for the reaction is:

2 Mg + O2 -> 2 MgO

Given:

Mass of magnesium (Mg) = 24.3 grams

Mass of oxygen gas (O2) = 16.0 grams

1: Calculate the moles of each reactant.

Moles of magnesium (Mg) = mass / molar mass = 24.3 g / 24.31 g/mol = 1.00 mol

Moles of oxygen gas (O2) = mass / molar mass = 16.0 g / 32.00 g/mol = 0.500 mol

2: Determine the limiting reactant.

The ratio of Mg to O2 in the balanced equation is 2:1. Since there are fewer moles of oxygen gas (0.500 mol) compared to magnesium (1.00 mol), oxygen gas is the limiting reactant.

3: Calculate the moles of magnesium oxide formed.

From the balanced equation, 2 moles of Mg react to form 2 moles of MgO.

Therefore, the moles of MgO formed is also 0.500 mol.

4: Calculate the mass of magnesium oxide formed.

Mass of magnesium oxide (MgO) = moles × molar mass

Mass of magnesium oxide (MgO) = 0.500 mol × 40.31 g/mol = 20.16 grams

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With the Quarter Moon which looks like half the moon we can see exactly 50% of the moon's face illuminated from earth. Sometimes it also gets confusing to remember which quarter we are seeing the moon appears lit on the right half of the moon during the first quarter. Let me now if you need more info :)

The ability of an atom in a covalent bond to attract the shared electrons to itself is best quantified by its electronegativity.

Electronegativity is the measure of the tendency of an atom to attract shared electrons in a covalent bond towards itself. It is a property of individual atoms, and it increases across a period and decreases down a group in the periodic table.

The electronegativity difference between two atoms in a covalent bond can indicate the polarity of the bond, with larger differences indicating more polar bonds. The electronegativity scale was proposed by Linus Pauling, and the most commonly used scale is the Pauling scale.

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If we heat an exothermic reaction at equilibrium then reverse reaction rate starts increasing to maintain an equilibrium.

In thermochemistry, an exothermic reaction is a "reaction for which the general standard enthalpy change ΔH₀ is negative." Exothermic responses typically discharge heat. The term is frequently mistaken for exergonic response, which IUPAC characterizes as "... a response for which the general standard Gibbs energy change ΔG₀ is negative."

A firmly exothermic response will typically likewise be exergonic in light of the fact that ΔH₀ makes a significant commitment to ΔG₀. The majority of the breathtaking compound responses that are shown in homerooms are exothermic and exergonic. The inverse is an endothermic reaction, which generally takes up heat and is driven by an entropy expansion in the framework.

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Answer: 6. Radiation

7. weather

8. Heat

9. Climate

Explanation:

The cation and anion then attract one another through the Coulomb force to form an ionic bond. Each ionic bond is formed between two oppositely charged ions, such as a sodium ion and a chloride ion.  Ionic bonding typically occurs between a metal and a nonmetal. Therefore, option B is the correct answer.

Ionic bond forms between a cation and an anion. Ionic bonds occur when a cation (positive ion) interacts with an anion (negative ion) through the Coulomb force. This electrostatic interaction is so powerful that the two ions become inseparable.The correct option is B. A cation and an anionIonic bonding is a type of chemical bonding in which ions with opposite charges are held together by electrostatic attraction. Ionic bonding takes place when one atom completely removes an electron from another, creating ions. When this occurs, the atom that has lost the electron becomes a cation, and the atom that has gained the electron becomes an anion. The cation and anion then attract one another through the Coulomb force to form an ionic bond. Each ionic bond is formed between two oppositely charged ions, such as a sodium ion and a chloride ion.  Ionic bonding typically occurs between a metal and a nonmetal. Therefore, option B is the correct answer.

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Answer:

Fuel experiment

Explanation:

since it involves direct observation of the animals

The partial pressure of CO (P_CO) at equilibrium is approximately 6.47 atm. Hence option e) 6.5 atm is correct.

C(s) + CO₂(g) ⇌ 2CO(g)

Since C is a solid, we only consider the gaseous species for equilibrium calculations. The Kp expression for this reaction is:

Kp = (P_CO)² / (P_CO₂)

Given that Kp = 167.5 and P_CO₂ = 0.25 atm, we can now solve for P_CO:

167.5 = (P_CO)² / 0.25

Rearrange the equation and solve for P_CO:

(P_CO)² = 167.5 * 0.25

P_CO = √(41.875) ≈ 6.47 atm

Therefore, the partial pressure of CO (P_CO) at equilibrium is approximately 6.47 atm.

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Answer:

C

Explanation:

Only this choice is applicable and correct.

The inter-molecular forces of attraction between the molecules must have been broken (overcome) before the molecules can gain an increase in the kinetic energies between them.

Answer:

the second one would have lower

Explanation:

because of the amount

pH is the measure of the negative log of the hydrogen ion concentration. The 0.4 M nitric acid will have lower pH.

pH is the concentration of the hydronium or the hydrogen ion in the water that gives the account to the basic and acidic nature of the substance.  

pH is dependent on the concentration of the substance as the increased concentration increases the pH while the lower concentration lowers the pH.

Therefore, 0.4 M will have a lower concentration.

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The coefficients for the balanced equation of the reaction _Cl2O5 + _H2O → _HClO3 are 1, 1, 2  (option B)

A fundamental aspect of mastering chemical reactions is ensuring a balance in the equations. By assigning coefficients to each element involved we can achieve this goal effectively. Here is how we can balance this particular reaction:

1 Cl2O5 + 1 H2O → 2 HClO3

The resulting balanced coefficients are as follows:

- Cl2O5 coefficient = 1

- H2O coefficient = 1

- HClO3 coefficient = 2

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Complete question:

What are the coefficients for the reaction _Cl2O5 + _H2O → _HClO3 once it is balanced?

A:1, 1, 1

B:1, 1, 2

C:1, 2, 2

D:2, 1, 1

Answer:

water

Explanation:

because it's capable of dissolving more substances

Answer:

B. water  It can dissolve more substances

Explanation:

Answer:

metals are are solids and has high melting point( except mercury and can also conduct heat and electricity, where non-metals may be solids also but,is brittle such as :diamonds etc... Its a bad conductor for heat and has low melting points

Answer:

false

Explanation:

in a double reaction, the negative ions switch places. not be replaced.

Answer:

Low melting point

Explanation:

Transition metals have the following properties:

Conductivity (Electrical and Thermal)

Malleability (You can hit it with a hammer to mold it)

High melting point

Answer:

Low melting point

Explanation:

Most transition metals property is high melting point.

From the gas laws, we can obtain that;

The final volume in the first question is 219 mL.

Gas laws stipulate the relationship between volume, pressure and temperature of gases based on the ideal gas approach.

1) V1 = 150 mL

P1 = 175 kPa

V2 = ?

P2 =  120 kPa

From Boyle's law;

P1V1 =P2V2

V2 = P1V1/P2

V2 = 175 kPa × 150 mL/120 kPa

V2 = 219 mL

2) V1 = 650 mL

   T1 = 30°C or 303 K

    V2 = ?

    T2 =  0.0°C or 273 K

V1/T1 = V2/T2

V1T2 = V2T1

V2 = V1T2/T1

V2 =  650 mL × 273 K/303 K

V2 = 586 mL

3) P1 =  50.0 psi

   T1 =  25.0°C or 298 K

   P2 = ?

   T2 = 100°C OR 373 K

P1/T1 = P2/T2

P1T2 = P2T1

P2 = P1T2/T1

P2 = 50.0 psi × 373 K/298 K

P2 = 63 Psi

4) V1 = 400.0 mL

  V2 = ?

  P1 =  600.0 mm Hg

  P2 = SP = 760 mmHg

P1V1 = P2V2

V2 = P1V1/P2

V2 = 600.0 mm Hg × 400.0 mL/760 mmHg

V2 = 316 mL

5) For the lower range;

P2 =  P1T2/T1

P2 = 30.0 psi × 253 K/300 K

P2 = 25.3 psi

For the higher range;

P2 =  P1T2/T1

P2 = 30.0 psi × 323 K/300 K

P2 = 32.3 psi

The pressure lies between  25.3 psi and 32.3 psi

6) P1V1/T1 = P2V2/T2

P1V1T2 = P2V2T1

V2 = P1V1T2/P2T1

  V2 = 480 mL × 95.5 kPa × 273 K / 101.325 kPa × 310 K

V2 = 398 mL

7) PV = nRT

n = PV/RT

P = 105 kPa or 0.049 atm

V =  1.75-L

R = 0.082 atm L K-1mol1-1

T = 23°C or 296 K

n = 0.049 atm ×  1.75-L/0.082 atm L K-1mol1-1 × 296 K

n = 0.0035 moles

8) PV = nRT

V = nRT/P

V = 1.5-mole × 0.082 atm L K-1mol1-1 × 308 K/ 1.12 atm

V = 33.8 L

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I think it's D

Hope that helps

Answer: B, the bonding in the compound is nonpolar covalent.

Explanation:

This is because with the same electronegativity, there is an equal sharing of electrons, which indicates that the bonding must be nonpolar.

The calculated concentration of citric acid in the juice samples will be overestimated due to the interference of Vitamin C.

Vitamin C, also known as ascorbic acid, is present in significant amounts in commercial juices. When NaOH is added to the juice sample to neutralize the citric acid, it reacts with the vitamin C as well, causing the volume of NaOH used to be higher than it should be.

This results in an overestimation of the concentration of citric acid in the sample. The reaction between vitamin C and NaOH is:

C6H8O6 + 2NaOH → Na2C6H6O6 + 2H2O

The NaOH reacts with both citric acid and vitamin C in the sample, which leads to an inaccurate measurement of the actual concentration of citric acid present in the juice. Therefore, it is essential to consider this interference while analyzing the results of the experiment.

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These energy exchanges are not changes in kinetic energy. They are changes in bonding energy between the molecules. "If heat is coming into a substance during a phase change, then this energy is used to break the bonds between the molecules of the substance.

The total ions which would be present in indium fluoride is +2

It follows that indium is an element which has an ion of +3 while fluorine has +1 ion. So therefore, adding these two ions together in the formula of this compund indium fluoride is given below:

+3 + (-1)

= +3 - 1

= +2

That being said, this indium fluoride has a number of properties. Some of it few properties are as follows:

In conclusion, it can be deduced from the explanation above that indium fluoride is a compound.

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The statement that describes the particles that make up the rigid structure of a three-dimensional crystalline solid is:

Solids are one of the three states in which matter exists.

Solids are characterized by their having definite shapes and volumes.

Solids have definite shapes and volumes because of the arrangement of the particles in a solid.

The intermolecular forces of the particles in a solid are very strong such that the particles are not free to move but  vibrate about a fixed position.

Thus, they are arranged in rigid continuous patterns as seen in solid crystals.

In conclusion, the particles in a crystalline solid are arranged in regular repeating patterns forming a three-dimensional structure.

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Answer:

name is Ian symbol is spices mass number is 100

Explanation:

#

The change in enthalpy when 9.75 g of aluminum reacts with excess ammonium nitrate is -367 kJ. The negative sign indicates that the reaction is exothermic and releases heat.

The given chemical equation is:

2 Al + 3 NH₄NO₃ → 6 H₂O + Al₂O₃ ΔH = -2030 kJ

This equation tells us that 2 moles of aluminum react with 3 moles of ammonium nitrate to form 6 moles of water and 1 mole of aluminum oxide, with the release of 2030 kJ of heat.

To determine the change in enthalpy when 9.75 g of aluminum reacts with excess ammonium nitrate, we need to first calculate the number of moles of aluminum present:

n(Al) = m(Al) / M(Al) = 9.75 g / 26.98 g/mol = 0.361 mol

According to the balanced chemical equation, 2 moles of aluminum react with the 3 moles of ammonium nitrate. As there is excess ammonium nitrate, we can assume that all of the aluminum will react.

Therefore, the reaction will produce:

(0.361 mol Al) x (3 mol NH₄NO₃ / 2 mol Al) = 0.542 mol NH₄NO₃

The amount of heat released can now be calculated using the molar enthalpy of reaction:

ΔH = (-2030 kJ / 1 mol) x (0.542 mol NH₄NO₃ / 3 mol NH₄NO₃) = -367 kJ

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The child needs 1,569.25 mg of amoxicillin per day, with 784.63 mg of amoxicillin per dose.

Streptococcus infections are commonly treated with amoxicillin, a broad-spectrum antibiotic.

Amoxicillin is effective against many different types of bacteria, including Streptococcus bacteria.

When a child has a streptococcus infection, amoxicillin may be prescribed at a dosage of 45 mg per kg of body weight per day given b.i.d.

In this case, a 76.8 lb child would be given 1,385.28 mg of amoxicillin per day, divided into two equal doses, for a total of 692.64 mg per dose.

Amoxicillin is a penicillin antibiotic used to treat infections caused by bacteria.

It is effective against many different types of bacteria, including streptococcus bacteria.

The required dosage of amoxicillin for a child is determined by their body weight and the extent of the infection they are experiencing.

In this case, the child weighs 76.8 lbs, which is equivalent to 34.85 kg.

The dosage of amoxicillin is 45 mg per kg of body weight per day, so the child needs 1,569.25 mg of amoxicillin per day.

This dosage is divided into two equal doses, so the child needs 784.63 mg of amoxicillin per dose.

Since amoxicillin is often taken orally, this dosage can be provided in the form of a tablet, suspension, or chewable tablet.

The duration of amoxicillin treatment will depend on the severity of the infection and the response of the child to the treatment. Generally, amoxicillin treatment lasts for 10 to 14 days.

The child should continue taking amoxicillin for the full prescribed course, even if they start feeling better before the treatment is completed.

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Endothermic reactions are chemical reactions in which energy is taken in from the environment in the form of heat.

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions involve changes in the arrangement of atoms in molecules and can often result in the formation of a different substance altogether. Chemical reactions are the core of chemistry and most of the processes that occur in nature, from the digestion of food to photosynthesis, involve chemical reactions. During a chemical reaction, bonds between atoms are broken and formed, resulting in different substances with different properties. Chemical reactions are usually accompanied by a release or absorption of energy, usually in the form of heat and light.

In this reaction, A and B react together to form C and the reaction requires 210J of energy. This energy is taken in from the environment as heat, which is a hallmark of endothermic reactions.

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Answer:

In the 1970s, Epel and other researchers showed that calcium is the essential factor that sparks development in eggs. As calcium levels rise, metabolic changes occur that cause the egg to divide and form into an embryo.

Explanation: