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Questions in chemistry

[Terjawab] 4. a) State the scientific principle involved in each of the following local industries: i. kenkey production ii. soap production iii. salt production iv. vegetable crop production v. gari processing (5marks) b) i. What is an alloy? ii. Name the main elements present in each of the following alloys: (a) Nichrome (B) Duralumin (y) Bronze (5marks).

[Terjawab] What is the pH of a [tex]$3.60 \times 10^{-6} M$[/tex] solution of the strong acid [tex]$HClO_4$[/tex]? [tex]$\begin{array}{l} HClO_4(aq)+H_2 O(\ell) \rightarrow ClO_4^{-}(aq)+H_3 O^{+}(aq) \ {\left[HClO_4\right]_0=3.60 \times 10^{-6}} \end{array}$[/tex]

[Terjawab] Compare and contrast physical and chemical changes in terms of molecular structure.

[Terjawab] Choose the complex which is paramagnetic: (i) [Fe(H2O)6]2+ (ii) K3[Cr(CN)6] (iii) K3[Fe(CN)6] (iv) K2[Ni(CN)4]

[Terjawab] Select the correct answer. Sugars are polar substances. Which action would make sugar more soluble in water? A. Increase the water temperature. B. Increase the surface tension of the water. C. Decrease the quantity of water. D. Decrease the polar nature of the sugar.

[Terjawab] 1. A fibre also known as artificial silk? 2. A synthetic fibre used for making swimwear? 3. Lycra is the other name of? 4. Plastics that have heavy cross-linking? 5. Substances that cannot be decomposed?

[Terjawab] This is organic chemistry 2 please i need the answer asap iam stuck on it

[Terjawab] Which reasons explain why acids are added to foods? Check all that apply. A. to make the foods more corrosive B. to reduce spoilage C. to add zest or sour taste to food D. to make the food taste bitter

[Terjawab] In the chemical equation for photosynthesis, carbon dioxide and water are converted to glucose and oxygen. [tex]6 CO_2+6 H_2 O \rightarrow C_6 H_{12} O_6+6 O_2[/tex] Which component could be added to complete this chemical equation? A. right energy B. ATP and NADPH C. chemical energy D. rubisco

[Terjawab] The mass of an empty container is 50.2 ± 0.3 g, and the mass of the container with a substance inside is 90.8 ± 0.5 g. The mass of the substance is: Select one: A. 40.6 ± 0.8 g B. 40.6 ± 0.2 g C. 40.6 ± 0.5 g D. 40.6 ± 0.3 g E. 41 ± 1 g