Tema
Q:
A \( 26.3-\mathrm{g} \) sample of dinitrogen monoxide is confined in a \( 5.78-\mathrm{L} \) vessel. What is the pressure (in atm) at \( 119 .{ }^{\circ} \mathrm{C} \). Round your answer to 3 significant figures.
Note: Reference the Fundamental constants table for additional information.
Q:
A 16.0 - g sample of dinitrogen monoxide is confined in a \( 3.93-\mathrm{L} \) vessel. What is the pressure (in atm) at \( 112 .{ }^{\circ} \mathrm{C} \). Round your answer to 3 significant figures.
Note: Reference the Fundamental constants table for additional information.
Q:
A sample of water cools down from \( 89.7^{\circ} \mathrm{C} \) to \( 43.2^{\circ} \mathrm{C} \) by releasing
\( 1.47 \times 10^{3} \mathrm{~kJ} \) of heat. What is the mass of water in this sample in grams?
- Report the answer with three significant figures.
- Report the answer in scientific notation.
- Use \( 4.184 \frac{\mathrm{~J}}{\mathrm{~g}{ }^{\circ} \mathrm{C}} \) for the specific heat of water.
Q:
Apply the principle of electroneutrality
Electroneutrality:
Q:
A sample of water cools down from \( 89.7^{\circ} \mathrm{C} \) to \( 43.2^{\circ} \mathrm{C} \) by releasing
\( 1.47 \times 10^{3} \mathrm{~kJ} \) of heat. What is the mass of water in this sample in grams?
- Report the answer with three significant figures.
- Report the answer in scientific notation.
- Use \( 4.184 \frac{\mathrm{~J}}{\mathrm{~g} \mathrm{C} \mathrm{C}} \) for the specific heat of water.
Q:
Determine whether an element is chemically reactive given only its electron configuration
Explain how atoms of elements in Group 2 of the periodic table achieve a stable octet. "
Q:
Given chromium's electron configuration, \( 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{~s}^{2} 3 \mathrm{~d}^{4} \), what is the
likely form of its ion?
Q:
- Explain how atoms of elements in Group 2 of the periodic table achieve a stable octet. *
Q:
a. What many elements are metals?
b. How many elements are metalloids?
c. How many elements are nonmetals?
d. Does germanium have more in common with silicon or arsenic? Give the reason.
e. Write down the name and chemical formula of the compound made of aluminum and phosphorus.
[Hint: Aluminum and phosphorus are in groups \( 3 A \) and \( 5 A \), respectively.]
Q:
Explain the differences between a sodium ion and a sodium atom as well as the differences between a sodium ion
and a neon atom. *
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