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Questions in chemistry

[Terjawab] Select the correct answer. Which notation is used to represent an alpha particle? A. ${ }_{-1}^0 \beta$ B. ${ }_0^0 y$ C. ${ }_2^4 He$ D. ${ }_1^0 n

[Terjawab] For elements belonging to Group 5 of the periodic table, determine the number of valence electrons.

[Terjawab] Consider the following reversible reaction. [tex]C(s)+O_2(g) \leftrightarrow CO_2(g)[/tex] What is the equilibrium constant expression for the given system? A. [tex]K _{e q}=\frac{\left[ CO _2\right]}{[ C ]\left[ O _2\right]}[/tex] B. [tex]K _{\text {eq }}=\frac{\left[ CO _2\right]}{\left[ O _2\right]}[/tex] C. [tex]K _{e q}=\frac{\left[ C ^3\left[ O _2\right]\right.}{\left[ CO _2\right]}[/tex] D. [tex]K _{e q}=\frac{\left[ O _2\right]}{\left[ CO _2\right]}[/tex]

[Terjawab] Select the best answer for the question. 17. How does an oil acid test kit indicate the presence of acid? A. The color changes B. The liquid in the sample tube boils C. The word "acidic" appears on the test strip D. The test kit produces a strong pungent odor

[Terjawab] Which represents a balanced nuclear equation? ${ }_{11}^{23} Na \longrightarrow{ }_{12}^{24} Mg +{ }_1^1 H$ ${ }_{11}^{24} Na \longrightarrow{ }_{12}^{24} Mg +{ }_{-1}^0 e$ ${ }_{13}^{24} Al \longrightarrow{ }_{12}^{24} Mg +{ }_{-1}^0 e$ ${ }_{12}^{23} Mg \longrightarrow{ }_{12}^{24} Mg +{ }_0^1 n$

[Terjawab] Select the correct answer. For heavy elements, what is the ratio of neutrons to protons that predicts a stable nucleus? A. 1:1 B. 1.5:1 C. 2:1 D. 10:5

[Terjawab] A student combined equal amounts of two solutions. One solution had a pH of 2 and the other had a pH of 12. Which would most likely be the resulting pH? A. 1 B. 3 C. 11

[Terjawab] The polyatomic ion with the formula CN- is called

[Terjawab] For a fuel to burn completely, a sufficient quantity of A. oxygen B. pressure C. tension D. vapor must be supplied.

[Terjawab] Why is photochemical smog typically worse in the summer? A. There is more solar energy to drive photochemical reactions. B. People tend to travel more in the summer. C. Temperature inversions and heat domes drive photochemical reactions. D. Warm temperatures prevent the dissipation of pollutants.