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Questions in chemistry

[Terjawab] Hydrogen has three isotopes ¹H, ²H, and ³H. What is the difference between these three isotopes? A. The number of protons ranges from 1 to 3. B. The number of electrons ranges from 1 to 3. C. The number of neutrons ranges from 0 to 2. D. The number of protons ranges from 0 to 2.

[Terjawab] What is the pH of a 0.048 M solution of hydrochloric acid ([tex]H^+[/tex])? A. 0.32 B. 4.80 C. -0.758 D. none of these available choices E. 1.32

[Terjawab] Choose the products that complete the reaction. The chemical equation may not be balanced. [tex]HC _2 H _3 O _2+ Ca ( OH )_2 \rightarrow[/tex] ? A. [tex]Ca \left( C _2 H _3 O _2\right)_2+ H _2 O[/tex] B. [tex]Ca \left( C _2 H _3 O _2\right)_2+ CO _2+ H _2 O[/tex] C. [tex]Ca \left( C _2 H _3 O _2\right)_2+ H _2[/tex]

[Terjawab] Consider the chemical equation in equilibrium: [tex]CH_4(g)+H_2 O(g) \Leftrightarrow CO(g)+3 H_2(g)[/tex] What will happen to the equilibrium of this reaction if the pressure is increased? A. The equilibrium will shift to the left to favor the reverse reaction. B. The equilibrium will not be affected by changing the pressure. C. The equilibrium will not be reestablished after this kind of stress.

[Terjawab] How did researchers detect whether da Vinci's paint contained walnut oil? A. The paint was dissolved in water, and the oil rose to the top. B. The paint was exposed to infrared absorption analysis. C. The paint was used in PCR (polymerase chain reaction) to detect walnut DNA. D. Somebody actually tasted it, and it tasted like oily walnuts.

[Terjawab] Sodium chloride reacts with copper sulfate to produce sodium sulfate and copper chloride [tex]2 NaCl(aq)+CuSO_4(aq) \rightarrow Na_2 SO_4(aq)+CuCl_2(s)[/tex] This equation represents a A. synthesis reaction. B. decomposition reaction. C. single replacement reaction. D. double replacement reaction.

[Terjawab] What is the pH of [tex]$6.30 \times 10^{-5} M HCl (H^+)$[/tex] solution?

[Terjawab] Consider the chemical equilibrium of the reaction: [tex]$NH_4 OH(aq) \Leftrightarrow NH_4^{+}(aq)+OH^{-}(aq)$[/tex] What will happen to the chemical equilibrium if [tex]$NH _4 Cl$[/tex] is added to this solution? A. The chemical equilibrium will shift to the right. B. The chemical equilibrium will not shift. C. The chemical equilibrium will shift to the left.

[Terjawab] A substance that increases the concentration of hydrogen ions when placed in water because it donates, or releases, H+ ions is a(n):

[Terjawab] 1. Which of the following is not considered as matter? a. Air b. Water c. Sun d. Light 2. The intermolecular force of attraction is maximum in a. Solids b. Liquids c. Gases d. Both a and c 3. Fluidity is maximum in a. Solids b. Liquids c. Gases d. All of these 4. Gases a. Cannot be compressed easily b. Occupy the entire space in the container c. Have a definite shape d. Cannot flow 5. Which of the following have only one free surface? a. Solids b. Liquids c. Gases d. All of these