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Questions in chemistry

[Terjawab] Which atom in the ground state contains only one completely filled p orbital? (1) Ne (2) O (3) He (4) Be

[Terjawab] What is the third quantum number of a $3 s^2$ electron in phosphorus, $1 s^2 2 s^2 2 p^6 3 s^2 3 p^3$? A. $m_l=0$ B. $m_l=2$ C. $m_l=1$ D. $m_l=3

[Terjawab] Select the correct answer. How many moles of $O _2$ are required to generate 18 moles of $H _2 O$ in the given reaction? $2 C_8 H_{18}+25 O_2 \rightarrow 16 CO_2+18 H_2 O$ A. 2 moles B. 12 moles C. 16 moles D. 18 moles E. 25 moles

[Terjawab] Refine this sentence: It is essential for coating the inoculating loop with LiCl solution, necessary for observing the specific color changes in the flame caused by LiCl.

[Terjawab] What is the predicted order of first ionization energies from highest to lowest for lithium (Li), sodium (Na), potassium $( K )$, and rubidium $( Rb )$? A. $Rb > K > Na > Li$ B. $K > Rb > Na > Li$ C. $Li > Na > K > Rb$ D. $Rb > K > Li > Na$

[Terjawab] What is the first quantum number of a $1 s^2$ electron in phosphorus, $1 s^2 2 s^2 2 p^6 3 s^2 3 p^3$? A. $n=1$ B. $n=0$ C. $n=2$ D. $n=3

[Terjawab] Select the correct answer. Which of the following is true for balancing equations? A. The number of products should be equal to the number of reactants. B. The properties of products should be the same as the properties of reactants. C. There must be an equal number of compounds on both sides of the equation. D. There must be an equal number of atoms of each element on both sides of the equation.

[Terjawab] Can you use melting point to determine the identity of an unknown solid? The metal is observed to begin to melt when the temperature of its container is approximately $29^{\circ} C$. The metal is most likely: copper lead mercury tin gallium | Substance | Melting Point | |---|---| | copper | $1,085^{\circ} C$ | | lead | $327.5^{\circ} C$ | | mercury | $-38.6^{\circ} C$ | | tin | $232^{\circ} C$ | | gallium | $29.78^{\circ} C$

[Terjawab] Select the correct answer. Which is a balanced chemical equation? A. $C _7 H _{16}+5 O _2 \rightarrow 6 CO _2+4 H _2 O$ B. $C _7 H _{16}+11 O _2 \rightarrow 7 CO _2+8 H _2 O$ C. $C _7 H _{16}+14 O _2 \rightarrow 7 CO _2+5 H _2 O$ D. $C _7 H _{16}+22 O _2 \rightarrow 14 CO _2+16 H _2 O$

[Terjawab] Calculate the work done when one mole of an ideal gas at 298 K and 5 atm pressure is allowed to expand irreversibly against the constant outside pressure of 1 atm until the internal pressure becomes the same as the outside pressure.