Q. What is the net gain of ATP molecules from one molecule of glucose during aerobic respiration? (2023)
A.
2
B.
18
C.
30-32
D.
36
Show solution
Solution
The net gain of ATP molecules from one molecule of glucose during aerobic respiration is approximately 30-32 ATP.
Correct Answer:
C
— 30-32
Learn More →
Q. What is the normal pH range of human blood? (2019)
A.
6.8 - 7.2
B.
7.35 - 7.45
C.
7.0 - 7.5
D.
7.8 - 8.0
Show solution
Solution
The normal pH range of human blood is tightly regulated between 7.35 and 7.45, which is essential for proper physiological function.
Correct Answer:
B
— 7.35 - 7.45
Learn More →
Q. What is the normal pH range of human urine? (2022)
A.
4.5 - 5.5
B.
6.0 - 7.0
C.
7.5 - 8.0
D.
9.0 - 10.0
Show solution
Solution
The normal pH range of human urine is typically between 6.0 and 7.0, indicating it is slightly acidic.
Correct Answer:
B
— 6.0 - 7.0
Learn More →
Q. What is the normal respiratory rate for a healthy adult at rest? (2022)
A.
10-12 breaths per minute
B.
12-20 breaths per minute
C.
20-30 breaths per minute
D.
30-40 breaths per minute
Show solution
Solution
The normal respiratory rate for a healthy adult at rest is typically between 12 to 20 breaths per minute.
Correct Answer:
B
— 12-20 breaths per minute
Learn More →
Q. What is the normality of a solution containing 3 moles of H2SO4 in 1 liter of solution? (2022) 2022
A.
3 N
B.
6 N
C.
1.5 N
D.
0.5 N
Show solution
Solution
Normality (N) = n * molarity, where n = number of equivalents. For H2SO4, n = 2. Thus, N = 2 * 3 M = 6 N.
Correct Answer:
B
— 6 N
Learn More →
Q. What is the number of moles in 10 grams of H2? (2020)
Show solution
Solution
Molar mass of H2 = 2 g/mol. Number of moles = mass/molar mass = 10 g / 2 g/mol = 5 moles.
Correct Answer:
A
— 0.5
Learn More →
Q. What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
Show solution
Solution
Molar mass of H2 = 2 g/mol. Number of moles = 10g/2g/mol = 5 moles.
Correct Answer:
B
— 0.5
Learn More →
Q. What is the number of moles in 250 mL of a 2 M NaCl solution? (2021)
Show solution
Solution
Moles = Molarity x Volume (L) = 2 M x 0.250 L = 0.5 moles.
Correct Answer:
A
— 0.5
Learn More →
Q. What is the number of moles in 44 grams of carbon dioxide (CO2)? (2023)
A.
1 mole
B.
2 moles
C.
0.5 moles
D.
0.25 moles
Show solution
Solution
The molar mass of CO2 is 44 g/mol. Therefore, 44 g of CO2 corresponds to 1 mole.
Correct Answer:
A
— 1 mole
Learn More →
Q. What is the number of moles in 44 grams of CO2? (2021) 2021
Show solution
Solution
Molar mass of CO2 = 12 + 16*2 = 44 g/mol. Number of moles = mass/molar mass = 44g/44g/mol = 1 mole.
Correct Answer:
A
— 1
Learn More →
Q. What is the number of moles in 500 mL of a 2 M NaCl solution? (2023)
Show solution
Solution
Moles = Molarity x Volume (L) = 2 moles/L x 0.5 L = 1 mole.
Correct Answer:
A
— 1
Learn More →
Q. What is the osmotic pressure of a 0.5 M NaCl solution at 25°C? (R = 0.0821 L·atm/(K·mol)) (2023)
A.
12.3 atm
B.
6.15 atm
C.
3.07 atm
D.
1.54 atm
Show solution
Solution
Osmotic pressure (π) = iCRT = 2 * 0.5 * 0.0821 * 298 = 24.5 atm. Therefore, π = 6.15 atm.
Correct Answer:
B
— 6.15 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 L of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
A.
2.03 atm
B.
1.96 atm
C.
0.82 atm
D.
0.25 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (0.1 mol)(0.0821 L·atm/(K·mol))(298 K) = 2.03 atm.
Correct Answer:
A
— 2.03 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 0.1 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L atm/K mol) (2020)
A.
2.06 atm
B.
0.82 atm
C.
1.01 atm
D.
0.25 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (0.1 mol)(0.0821 L atm/K mol)(298 K) = 2.06 atm.
Correct Answer:
A
— 2.06 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 0.1 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
A.
2.5 atm
B.
0.82 atm
C.
1.0 atm
D.
0.25 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (0.1 moles * 0.0821 * 298) / 1 = 2.5 atm.
Correct Answer:
A
— 2.5 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2021)
A.
12.3 atm
B.
10.2 atm
C.
8.2 atm
D.
6.1 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (0.5 moles * 0.0821 L·atm/(K·mol) * 298 K) / 1 L = 12.3 atm.
Correct Answer:
B
— 10.2 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 0.5 moles of solute in 1 liter of solution at 25 °C? (2021)
A.
12.3 atm
B.
24.6 atm
C.
6.1 atm
D.
3.1 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (0.5 moles)(0.0821 L·atm/(K·mol))(298 K) = 12.3 atm.
Correct Answer:
B
— 24.6 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (2021)
A.
0.0821 atm
B.
1.0 atm
C.
2.0 atm
D.
4.0 atm
Show solution
Solution
Osmotic pressure (π) = iCRT = 1 * 2 * 0.0821 * 298 = 4.0 atm (i = 1 for glucose).
Correct Answer:
C
— 2.0 atm
Learn More →
Q. What is the osmotic pressure of a solution containing 2 moles of glucose in 1 liter of solution at 25 °C? (R = 0.0821 L·atm/(K·mol)) (2020)
A.
0.82 atm
B.
1.64 atm
C.
2.46 atm
D.
4.92 atm
Show solution
Solution
Osmotic pressure (π) = nRT/V = (2 moles * 0.0821 L·atm/(K·mol) * 298 K) / 1 L = 4.92 atm.
Correct Answer:
B
— 1.64 atm
Learn More →
Q. What is the outermost layer of a plant stem called? (2022)
A.
Cortex
B.
Epidermis
C.
Phloem
D.
Xylem
Show solution
Solution
The outermost layer of a plant stem is called the epidermis, which protects the plant from environmental damage.
Correct Answer:
B
— Epidermis
Learn More →
Q. What is the outermost layer of cells in a plant called? (2023)
A.
Cortex
B.
Epidermis
C.
Phloem
D.
Xylem
Show solution
Solution
The outermost layer of cells in a plant is called the epidermis, which protects the plant from environmental damage.
Correct Answer:
B
— Epidermis
Learn More →
Q. What is the outermost whorl of a flower called? (2023)
A.
Calyx
B.
Corolla
C.
Androecium
D.
Gynoecium
Show solution
Solution
The outermost whorl of a flower is called the calyx, which is made up of sepals.
Correct Answer:
A
— Calyx
Learn More →
Q. What is the oxidation state of chlorine in NaClO3? (2022) 2022
Show solution
Solution
In NaClO3, the oxidation state of chlorine is +5. Sodium is +1 and each oxygen is -2, leading to the equation: +1 + x + 3(-2) = 0, solving gives x = +5.
Correct Answer:
C
— +5
Learn More →
Q. What is the oxidation state of chromium in K2Cr2O7? (2021) 2021
Show solution
Solution
In K2Cr2O7, the total charge from potassium (K) is +2, and oxygen (O) contributes -14. Let the oxidation state of Cr be x. The equation is 2x - 14 + 2 = 0, solving gives x = +6.
Correct Answer:
B
— +6
Learn More →
Q. What is the oxidation state of nitrogen in NH4+? (2020) 2020
Show solution
Solution
In NH4+, nitrogen has an oxidation state of -3. Each hydrogen is +1, leading to the equation: x + 4(+1) = +1, solving gives x = -3.
Correct Answer:
A
— -3
Learn More →
Q. What is the oxidation state of nitrogen in NH4Cl? (2023)
Show solution
Solution
In NH4Cl, the oxidation state of nitrogen is -3, as it is bonded to four hydrogens.
Correct Answer:
A
— -3
Learn More →
Q. What is the oxidation state of phosphorus in phosphoric acid (H3PO4)? (2020) 2020
Show solution
Solution
In H3PO4, phosphorus has an oxidation state of +5.
Correct Answer:
B
— +5
Learn More →
Q. What is the oxidation state of sulfur in H2SO4? (2021) 2021
Show solution
Solution
In H2SO4, the oxidation state of sulfur is +6. Each hydrogen is +1 and each oxygen is -2, leading to the equation: 2(+1) + x + 4(-2) = 0, solving gives x = +6.
Correct Answer:
A
— +6
Learn More →
Q. What is the oxidation state of sulfur in H2SO4? (2023) 2023
Show solution
Solution
In H2SO4, the oxidation state of sulfur is +6.
Correct Answer:
C
— +6
Learn More →
Q. What is the packing efficiency of a body-centered cubic (BCC) structure? (2020)
A.
52%
B.
68%
C.
74%
D.
100%
Show solution
Solution
The packing efficiency of a body-centered cubic (BCC) structure is approximately 68%.
Correct Answer:
B
— 68%
Learn More →
Showing 3061 to 3090 of 5509 (184 Pages)