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Questions in chemistry

[Terjawab] A molecule with a single covalent bond is A. $SiSe _2$ B. $Cl _2$ C. $CO _2$ D. $N _2$

[Terjawab] In a chemical equation, which symbol should be used to indicate that a substance is in solution? (1) (aq)

[Terjawab] What is the molality of a solution that has 3 mol of glucose in 6 kg of water? A. $\frac{6 kg}{3 mol}$ B. $\frac{3 mol}{6 L}$ C. $\frac{3 kg}{6 L}$ D. $\frac{3 mol}{6 kg}$

[Terjawab] Write the equilibrium expression for the autoionization of water. [tex]K _{ w }=\left[ H _3 O ^{+}\right][ OH ] /\left[ H _2 O \right]^2[/tex] [tex]K _{ w }=\left[ H _2 O \right]^2 /\left[ H _3 O ^{+}\right]\left[ OH ^{-}\right][/tex] [tex]K _{ w }=\left[ H _3 O ^{+}\right]\left[ OH ^{-}\right][/tex]

[Terjawab] What charge does an ion have if it has more protons than electrons? A. A net positive charge B. Neutral, since protons are inside the nucleus C. A net negative charge D. No charge

[Terjawab] Brown eyes are dominant over blue eyes. If two brown-eyed parents have a child with blue eyes, what does it mean about the parents’ genotype? A. One must be homozygous recessive. B. One must be heterozygous. C. They must both be heterozygous. D. They must both be homozygous dominant

[Terjawab] Consider the reaction: [tex]2 HF(g) \longleftrightarrow H_2(g)+F_2(g)[/tex] At equilibrium at 600 K, the concentrations are as follows: [tex]\begin{array}{l} {[HF]=5.82 \times 10^{-2} M} \\ {\left[H_2\right]=8.4 \times 10^{-3} M} \\ {\left[F_2\right]=8.4 \times 10^{-3} M} \end{array}[/tex] What is the value of [tex]K _{ eq }[/tex] for the reaction expressed in scientific notation? A. [tex]2.1 \times 10^{-2}[/tex] B. [tex]2.1 \times 10^2[/tex] C. [tex]1.2 \times 10^{-3}[/tex]

[Terjawab] Choose the products that complete the reaction. The chemical equations may not be balanced. [tex]HCl + NaOH \rightarrow[/tex] ? A. [tex]NaCl + H _2 O[/tex] B. [tex]NaCl + CO _2+ H _2 O[/tex] C. [tex]NaCl + H _2[/tex]

[Terjawab] What would the final freezing point of water be if 3 mol of sugar were added to 1 kg of water ([tex]K_f=1.86^{\circ} C /( mol / kg )[/tex] for water and [tex]/=1[/tex] for sugar)? A. [tex]+5.58^{\circ} C[/tex] B. [tex]-1.86^{\circ} C[/tex] C. [tex]-0.62^{\circ} C[/tex] D. [tex]-5.58^{\circ} C[/tex]

[Terjawab] Consider this reaction: $KOH + HBr \rightarrow KBr + H _2 O$ Which statement is most likely true about HBr? A. It turns blue litmus red. B. It reacts with carbon dioxide to form a carbonate. C. It feels slippery.