Q. What is the term for the transition from a gas to a liquid?
-
A.
Sublimation
-
B.
Condensation
-
C.
Evaporation
-
D.
Freezing
Solution
The transition from a gas to a liquid is called condensation.
Correct Answer: B — Condensation
Learn More →
Q. What is the term for the transition from a solid directly to a gas?
-
A.
Melting
-
B.
Sublimation
-
C.
Condensation
-
D.
Evaporation
Solution
Sublimation is the process where a solid transitions directly to a gas without becoming a liquid.
Correct Answer: B — Sublimation
Learn More →
Q. What is the term for the transition from liquid to gas at temperatures below the boiling point?
-
A.
Evaporation
-
B.
Condensation
-
C.
Sublimation
-
D.
Freezing
Solution
Evaporation is the process of a liquid turning into gas below its boiling point.
Correct Answer: A — Evaporation
Learn More →
Q. What is the term for the transition from liquid to gas?
-
A.
Condensation
-
B.
Evaporation
-
C.
Sublimation
-
D.
Freezing
Solution
Evaporation is the process where liquid turns into gas.
Correct Answer: B — Evaporation
Learn More →
Q. What is the term for the transition from solid to gas without passing through the liquid state?
-
A.
Sublimation
-
B.
Deposition
-
C.
Evaporation
-
D.
Condensation
Solution
Sublimation is the process where a solid turns directly into a gas.
Correct Answer: A — Sublimation
Learn More →
Q. What is the term used for the amount of solute that can be adsorbed per unit mass of adsorbent?
-
A.
Adsorption isotherm
-
B.
Adsorption capacity
-
C.
Adsorption efficiency
-
D.
Adsorption rate
Solution
The term 'adsorption capacity' refers to the amount of solute that can be adsorbed per unit mass of adsorbent.
Correct Answer: B — Adsorption capacity
Learn More →
Q. What is the theoretical yield of Na2SO4 when 10 g of Na reacts with excess sulfuric acid?
-
A.
20 g
-
B.
30 g
-
C.
40 g
-
D.
50 g
Solution
10 g of Na = 0.434 moles. 2Na + H2SO4 → Na2SO4 + H2. 0.434 moles of Na2SO4 = 0.434 * 142 g = 61.6 g.
Correct Answer: B — 30 g
Learn More →
Q. What is the theoretical yield of NaCl when 23 g of Na reacts with Cl2?
-
A.
58.5 g
-
B.
23 g
-
C.
46 g
-
D.
69 g
Solution
23 g of Na = 1 mole. 1 mole of Na produces 1 mole of NaCl = 58.5 g.
Correct Answer: A — 58.5 g
Learn More →
Q. What is the theoretical yield of NaCl when 23 g of Na reacts with excess Cl2?
-
A.
58.5 g
-
B.
23 g
-
C.
46 g
-
D.
11.5 g
Solution
23 g of Na = 1 mole. 1 mole of Na produces 1 mole of NaCl = 58.5 g.
Correct Answer: A — 58.5 g
Learn More →
Q. What is the total number of atoms in 1 mole of CO2?
Solution
1 mole of CO2 contains 1 carbon atom and 2 oxygen atoms, totaling 3 atoms.
Correct Answer: C — 3
Learn More →
Q. What is the total number of atoms in one molecule of C2H5OH?
Solution
C2H5OH has 2 carbon, 6 hydrogen, and 1 oxygen atom, totaling 7 atoms.
Correct Answer: A — 7
Learn More →
Q. What is the total number of atoms in one molecule of C4H10?
Solution
C4H10 has 4 carbon atoms and 10 hydrogen atoms, totaling 14 atoms.
Correct Answer: C — 14
Learn More →
Q. What is the total number of electrons in the electronic configuration [Kr] 5s2 4d10 5p5?
Solution
The total number of electrons is 36 (from Kr) + 2 (from 5s2) + 10 (from 4d10) + 5 (from 5p5) = 53.
Correct Answer: D — 53
Learn More →
Q. What is the total number of moles of gas produced when 1 mole of CaCO3 decomposes to form CaO and CO2?
-
A.
0.5 moles
-
B.
1 mole
-
C.
2 moles
-
D.
3 moles
Solution
The decomposition reaction is CaCO3 → CaO + CO2. This produces 1 mole of CaO and 1 mole of CO2, totaling 2 moles of gas.
Correct Answer: C — 2 moles
Learn More →
Q. What is the total number of moles of gas produced when 1 mole of CaCO3 decomposes?
-
A.
1 mole
-
B.
2 moles
-
C.
3 moles
-
D.
0 moles
Solution
The decomposition of CaCO3 produces CaO and CO2: CaCO3 → CaO + CO2. This results in 1 mole of gas (CO2) being produced.
Correct Answer: B — 2 moles
Learn More →
Q. What is the total number of orbitals in the n=2 shell?
Solution
The n=2 shell has 4 orbitals: 1s and 3p orbitals.
Correct Answer: B — 4
Learn More →
Q. What is the total number of orbitals in the n=3 energy level?
Solution
The total number of orbitals in the n=3 level is given by n^2 = 3^2 = 9.
Correct Answer: B — 6
Learn More →
Q. What is the total number of orbitals in the n=4 shell?
Solution
The total number of orbitals in a shell is given by n^2. For n=4, it is 4^2 = 16.
Correct Answer: C — 16
Learn More →
Q. What is the total number of quantum numbers required to completely describe an electron in an atom?
Solution
Four quantum numbers (n, l, m_l, s) are required to completely describe an electron in an atom.
Correct Answer: C — 4
Learn More →
Q. What is the unit of electric charge?
-
A.
Volt
-
B.
Ampere
-
C.
Coulomb
-
D.
Ohm
Solution
The unit of electric charge is the Coulomb.
Correct Answer: C — Coulomb
Learn More →
Q. What is the unit of electrical charge?
-
A.
Volt
-
B.
Ampere
-
C.
Coulomb
-
D.
Ohm
Solution
The unit of electrical charge is the Coulomb.
Correct Answer: C — Coulomb
Learn More →
Q. What is the unit of enthalpy?
-
A.
Joules per mole (J/mol)
-
B.
Calories per mole (cal/mol)
-
C.
Both A and B
-
D.
Liters per mole (L/mol)
Solution
Enthalpy can be expressed in both Joules per mole and Calories per mole.
Correct Answer: C — Both A and B
Learn More →
Q. What is the unit of entropy?
-
A.
J/mol·K
-
B.
J/K
-
C.
K
-
D.
J/mol
Solution
The unit of entropy is Joules per mole per Kelvin (J/mol·K).
Correct Answer: A — J/mol·K
Learn More →
Q. What is the unit of rate constant for a second-order reaction?
-
A.
mol/L·s
-
B.
L/(mol·s)
-
C.
s^-1
-
D.
mol^2/L^2·s
Solution
The unit of rate constant for a second-order reaction is L/(mol·s).
Correct Answer: B — L/(mol·s)
Learn More →
Q. What is the unit of the rate constant for a second-order reaction?
-
A.
mol/L·s
-
B.
L²/mol²·s
-
C.
1/s
-
D.
mol/L
Solution
The unit of the rate constant for a second-order reaction is L²/mol²·s.
Correct Answer: B — L²/mol²·s
Learn More →
Q. What is the value of k for which the equation x^2 - 2kx + 3 = 0 has roots that are reciprocals of each other?
Solution
If the roots are reciprocals, then k = sum of roots = 0 and product = 1. Thus, k = 2.
Correct Answer: B — 2
Learn More →
Q. What is the value of k for which the equation x^2 - 4x + k = 0 has roots that are equal?
Solution
For equal roots, the discriminant must be zero: (-4)^2 - 4*1*k = 0 => 16 - 4k = 0 => k = 4.
Correct Answer: A — 4
Learn More →
Q. What is the value of k if the roots of the equation x^2 + kx + 16 = 0 are equal?
Solution
For equal roots, the discriminant must be zero: k^2 - 4*1*16 = 0 => k^2 = 64 => k = 8 or k = -8.
Correct Answer: B — 8
Learn More →
Q. What is the value of k if the roots of the equation x^2 - kx + 12 = 0 are 3 and 4?
Solution
Using Vieta's formulas, k = 3 + 4 = 7.
Correct Answer: A — 7
Learn More →
Q. What is the value of l for a d orbital?
Solution
For d orbitals, the azimuthal quantum number l is equal to 2.
Correct Answer: C — 2
Learn More →
Showing 961 to 990 of 1494 (50 Pages)