Use the following table to answer the question. Strong acids Weak acids Weak bases Strong bases HBr CH3COOH NH3 NaOH HCl HF NH4OH KOH H2SO4 HCN Cu(OH)2 Ca(OH)2 Which of these salts has the highest pH? K2SO4 Cu2SO4 NH4Cl NaCH3COO

Answers

Answer 1

Answer:

Answer: D. NaCH3COO

Explanation:

Let's go through each of these salts and think about the reactions behind them. Keep in mind that the salt with the highest pH is the most basic.

(The underlined atoms can match the chemical formula for the salt. By matching the atoms, we can reason which bases and which acids reacted to produce a given salt.)

A. K2SO4

Using the table, we can assume that this salt was produced by with the reactants of the strong baseKOH and the strong acid H2SO4
A strong base and strong acid react to produce a more neutral salt, so this is likely the incorrect answer

B. Cu2SO4

Using the table, we can assume that this salt was produced by with the reactants of the weak baseCu(OH)2 and the strong acid H2SO4
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

C. NH4Cl

Using the table, we can assume that this salt was produced by with the reactants of the weak baseNH4OH and the strong acid HCl
A weak base and strong acid react to produce a more acidic salt, so this is likely the incorrect answer

D. NaCH3COO

Using the table, we can assume that this salt was produced by with the reactants of the strong baseNaOH and the weak acidCH3COOH
A strong base and weak acid react to produce a more basic salt, so this is likely the CORRECT answer

Answer 2

Answer:

Final answer:

Sodium acetate (NaCH3COO) has the highest pH among the given salts because it is derived from a strong base and a weak acid, resulting in a basic solution upon dissolution in water.

Explanation:

The question asks which salt among K2SO4, CuSO4, NH4Cl, and NaCH3COO has the highest pH. To determine this, we consider the acidic or basic nature of the ions in each compound.

Sodium acetate (NaCH3COO) is formed from sodium hydroxide (NaOH), a strong base, and acetic acid (CH3COOH), a weak acid. When this salt dissolves in water, it produces Na+ ions and CH3COO- ions. The acetate ion can react with water to produce a small amount of OH- (hydroxide ions), causing the solution to be basic.

Ammonium chloride (NH4Cl) is derived from the weak base ammonia (NH3) and hydrochloric acid (HCl), a strong acid. This salt in solution will lower the pH due to the production of H+ ions from NH4+.

Potassium sulfate (K2SO4) and Copper(II) sulfate (CuSO4) are salts of sulfuric acid (H2SO4), a strong acid, and strong bases (KOH and Cu(OH)2 respectively). Since both strong acids and strong bases completely dissociate, the resulting salts typically do not affect the pH significantly.

Of these, NaCH3COO will have the highest pH because it creates a basic solution when dissolved in water.

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Under which conditions of temperature and pressure would a 1-liter sample of a real gas behave most like an ideal gas?(1) 100 K and 0.1 atm
(2) 100 K and 10 atm
(3) 500 K and 0.1 atm
(4) 500 K and 10 atm

Answers

Answer : The correct option is (3) 500 K and 0.1 atm.

Explanation :

A real gas behaves ideally at high temperature and low pressure.

The ideal gas equation is,

$PV=nRT$

where,

P = pressure of gas

V = Volume of gas

R = Gas constant

T = temperature of gas

n = number of moles of gas

The ideal gas works properly when the inter-molecular interactions between the gas molecules and volume of gas molecule will be negligible. This is possible when pressure is low and temperature is high.

Therefore, the correct option is (3) 500 K and 0.1 atm.

Answer:

The correct answer is (3).

Explanation:

A real gas can behave ideally at high temperatures and low pressures. The ideal gas is correctly characterized when the intermolecular interactions between the gas molecules and the volume of the gas molecule are negligible. This is only possible when system conditions are at low pressures and high temperatures.

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At STP, 1.0 liter of helium contains the same total number of atoms as(1) 1.0 L of Ne (3) 0.5 L of Rn
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Answers

Answer: (1) 1.0 L of Ne

Explanation: According to Avogadro's law, 1 mole of every gas occupy 22.4 Liters at STP and contains avogadro's number $6.023* 10^(23)$ of particles.

Avogadro's Law: This law states that volume is directly proportional to the number of moles of the gas at constant pressure and temperature.

$V\propto n$ (At constant temperature and pressure)

Thus equal volumes contain equal number of atoms.

Hence, 1.0 liter of helium contains the same total number of atoms as

1.0 L of Ne at STP.

The answer is (1) 1.0 L of Ne. The gases under same condition with same volume have the same molar number. And the question is asking the number of atoms. Because the elements given all have same number of atoms when having same molar number.

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Answers

Five points of Dalton's atomic theory:
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Another change is the presence of isotopes of atoms of different elements. Hence, atoms of the same element can also have different masses.

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Answers

Answer:

Explanation:

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Answers

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