chemistry 1211 Question and answers verified to pass 2025
1. Determine the mass in grams of 2.58 × 10²¹
3.20 × 10⁻¹ g or
atoms of arsenic. (The mass of one mole of
0.321 g ex. look at
arsenic is 74.92 g.)
picture
2. A chemist encounters an unknown metal. They 0.53 g/mL
drop the metal into a graduated cylinder
containing water, and find the volume change ex. look at picture
is 3.2 mL. If the metal weighs 1.7 g, what is
the density of the metal?
0.781 g
3. How many grams of precipitate will be ex. look at picture
formed when
20.5 mL of 0.800 M Co(NO₃)₂ reacts with 21.0
mL of 0.800 M NaOH in the following chemical
reaction? Co(NO₃)₂ (aq) + 2 NaOH (aq) ’Co(OH)₂
(s) + 2 NaNO₃ (aq)
4. What is the bond order of H₂⁺? 0.5
5. Which element has the electron configuration Cr
1s²2s²2p⁶3s²3p⁶4s¹3d⁵?
,chemistry 1211 Question and answers verified to pass 2025
6. 61.53%
ex.picture
,chemistry 1211 Question and answers verified to pass 2025
In this reaction: Mg (s) + I₂ (s) ’MgI₂ (s) If 2.86 moles of Mg react with 3.56
moles of I₂, and 1.76 moles of MgI₂ form, what is the percent yield?
7. In the following reaction, how much heat is generated 3264.1 kJ or
when 4.07 moles of CH₄ are burned? CH₄ (g) + 2 O₂ J/g°eC.)
(g) ’
CO₂ (g) + 2 H₂O(g) H° = -802 kJ/mol
8. If 901 J of heat is available, how many grams
of iron (specific heat = 0.45 J/g°eC) can be
heated from 22.5°C to 120.0°C?
9. What temperature (in °C) did an ideal gas
shift to if it was initially at -21.0 °C at 4.62
atm and 35.0 L and
the pressure was changed to 8.71 atm and the
volume changed to 15.0 L?
10. Which of the following is true concerning
successive ionizations of an atom and its
ions?
11. An 80.0 g sample of metal, initially at 96.0°C,
is placed into 150. g of water initially at 26.0°C
in a calorimeter. The final temperature of the
water is 28.1°C. What is the identity of the
metal? (The specific heat of water is 4.18
1. Determine the mass in grams of 2.58 × 10²¹
3.20 × 10⁻¹ g or
atoms of arsenic. (The mass of one mole of
0.321 g ex. look at
arsenic is 74.92 g.)
picture
2. A chemist encounters an unknown metal. They 0.53 g/mL
drop the metal into a graduated cylinder
containing water, and find the volume change ex. look at picture
is 3.2 mL. If the metal weighs 1.7 g, what is
the density of the metal?
0.781 g
3. How many grams of precipitate will be ex. look at picture
formed when
20.5 mL of 0.800 M Co(NO₃)₂ reacts with 21.0
mL of 0.800 M NaOH in the following chemical
reaction? Co(NO₃)₂ (aq) + 2 NaOH (aq) ’Co(OH)₂
(s) + 2 NaNO₃ (aq)
4. What is the bond order of H₂⁺? 0.5
5. Which element has the electron configuration Cr
1s²2s²2p⁶3s²3p⁶4s¹3d⁵?
,chemistry 1211 Question and answers verified to pass 2025
6. 61.53%
ex.picture
,chemistry 1211 Question and answers verified to pass 2025
In this reaction: Mg (s) + I₂ (s) ’MgI₂ (s) If 2.86 moles of Mg react with 3.56
moles of I₂, and 1.76 moles of MgI₂ form, what is the percent yield?
7. In the following reaction, how much heat is generated 3264.1 kJ or
when 4.07 moles of CH₄ are burned? CH₄ (g) + 2 O₂ J/g°eC.)
(g) ’
CO₂ (g) + 2 H₂O(g) H° = -802 kJ/mol
8. If 901 J of heat is available, how many grams
of iron (specific heat = 0.45 J/g°eC) can be
heated from 22.5°C to 120.0°C?
9. What temperature (in °C) did an ideal gas
shift to if it was initially at -21.0 °C at 4.62
atm and 35.0 L and
the pressure was changed to 8.71 atm and the
volume changed to 15.0 L?
10. Which of the following is true concerning
successive ionizations of an atom and its
ions?
11. An 80.0 g sample of metal, initially at 96.0°C,
is placed into 150. g of water initially at 26.0°C
in a calorimeter. The final temperature of the
water is 28.1°C. What is the identity of the
metal? (The specific heat of water is 4.18
