EverythingOnConstruction - Ask. Build. Learn together. Logo

Questions in chemistry

[Solved] The following process shows two changes: H₂O at 0°C -> H₂O at 25°C -> H₂O at 100°C Identify process X and Y. a) X - Freezing, Y - Melting b) X - Melting, Y - Boiling c) X - Condensation, Y - Melting d) X - Evaporation, Y - Condensation

[Solved] Which acids have hydro- as part of their name? H₂SO₃ HBr HClO₂ HF HNO₃

[Solved] A gaseous reaction 2X(g) → Y(g) is observed to be second order with respect to reactant X. If the half-life of this reaction is 20 minutes when the initial partial pressure of X is 0.4 atm, what will be the half-life when the initial partial pressure of X is increased to 0.8 atm, assuming the temperature remains constant? (A) 5 minutes (B) 10 minutes (C) 20 minutes (D) 40 minutes

[Solved] Consider the chemical equilibrium of a soap that is present in its aqueous solution. [tex]\begin{array}{c} C_{17} H_{35} COONa(aq) \\ \text { sodium stearate (soap) } \end{array} \Leftrightarrow C_{17} H_{35} COO^{-}(aq)+Na^{+}(aq)+\begin{array}{l} \text { stearate ion } \end{array}[/tex] What will happen if a large quantity of NaCl is added to the aqueous solution? A. The equilibrium will shift to the right, favoring the dissociation of soap in aqueous solution. B. The equilibrium will shift to the left to such an extent that it leads to the precipitation of solid soap. C. The equilibrium will not be affected by the addition of NaCl to the solution. D. The equilibrium will be permanently destroyed by the addition of NaCl.

[Solved] What is the pOH of a solution with $[OH^{-}]=1.4 \times 10^{-18}$? A. 13.15 B. 12.85 C. -13.15 D. 14.00

[Solved] i. Write a balanced chemical equation of Calcium oxide in water: [tex]CaO (s)+ H _2 O (1) \rightarrow Ca (OH)_2[/tex] ii. What is the common name for Calcium Oxide? iii. During production of calcium oxide from limestone, a gas is evolved as a byproduct. Describe the chemical test for the gas and by what method is the gas collected/prepared in the laboratory? Give a reason for your answer.

[Solved] Consider these two statements regarding the equation [tex]$PCl _5(g) \rightleftharpoons PCl _3+ Cl _2+$[/tex] heat: Statement 1: Adding heat to this reaction mixture would increase the reverse reaction. Statement 2: Cooling this reaction mixture would increase the forward reaction. A. Statements 1 and 2 are both true. B. Statement 1 is true, and statement 2 is false. C. Statements 1 and 2 are both false. D. Statement 1 is false, and statement 2 is true.

[Solved] Which row describes the changes to the atoms when a metal and a non-metal react together? | | Metal atoms | Non-metal atoms | |---|---------------------------------|-----------------------------------| | A | Gain electrons to form anions | Lose electrons to form cations | | B | Gain electrons to form cations | Lose electrons to form anions | | C | Lose electrons to form anions | Gain electrons to form cations | | D | Lose electrons to form cations | Gain electrons to form anions

[Solved] Consider the following equation in chemical equilibrium: [tex]$C_2 H_4(g)+H_2(g) \Leftrightarrow C_2 H_6(g)+137 kJ$[/tex] What happens to the amount of ethane ([tex]$C_2 H_6$[/tex]) when the temperature of the system is increased? A. The amount of ethane decreases. B. The amount of ethane increases initially and then decreases. C. The amount of ethane increases. D. The amount of ethane decreases initially and then increases.

[Solved] Who built the first atomic bomb?