Chemistry Homework Assistance
QuestionAI's chemistry problem solver is a middle school chemistry tutoring tool that summarises key chemical reactions and equations in real-time, featuring a robust learning system to empower even those with a weak foundation in chemistry.
You needn't fret over the elemental properties of the periodic table anymore. Here, you can effortlessly access chemical reactions and reaction principles corresponding to each element. Deductive reasoning from microscopic phenomena to discern the original structure of molecules and atoms is a research technique we staunchly champion.
- A Class A fire extingisher is for use on general combustibles such as: Gasoline Wood Engine oil Sodium
- 4(a) 0.197g of an organic compound gave on combustion 0.32g of CO_(2) and 0.156g of H_(2)O. Calculate the percentage composition of carbon, hydrogen and oxygen in the compound. (b) Give hybridization state of each carbon atom (a-c) in the compound (1) (1) (c) (i) Highlight 6 separation techniques and explain one (ii) Give 4 difference between graphite and diamond. SECTION C __ 5a State three (3)physical properties of Alkanes b. Write a balanced chemical equation for the incomplete combustion of Pentane c. Give the nomenclature of the following compounds CH_(3) CH_(3) (ii) CH_(3)CH_(3) CH_(3)-C-C-C-C-C-CH_(3) HHHH (iii) H-Cequiv C-CH_(2)-C=C-H d. State 3 uses of Alkenes 6(a) State three differences between compressed natural gas (CNG) and liquefied petroleum gas (LPG) (b) List 3 chemical properties of Alkenes and explain one with a chemical equation (c) Draw the structure of the following hydrocarbon (i) 4-ethyl-1,3-dimethylheptane (ii) 2-methylbut-2-ene (iii) 3-propylhex-1,4-diene (d) Each of sample A and B decolourize bromine water (Br/H_(2)O) but only sample B on furthe reaction with a solution of copper(ti)chloride in liquid ammonia gives a reddish-brown precipitate (i) Name the family of hydrocarbon sample A and B belongs (ii) State why sample A an B react with bromine water.
- 21 The diagram shows the electrolysis of molten sodium chloride, NaCl. Which is correct? A oxidation occurs at electrode X and the equation is: 2Cl^-arrow Cl_(2)+2e^- B oxidation occurs at electrode Y and the equation is: Na^++e^-arrow Na C reduction occurs at electrode X and the equation is: Na^++e^-arrow Na D reduction occurs at electrode Y and the equation is: 2Cl^-arrow Cl_(2)+2e^-
- Textbook 4. Match each of the items given in List A with the appropriate item in List B. List A (a) elemental mercury List B (b) uranium-235 (i) low energy requirement (c) thick lead (ii) very dense liquid (d)americium-241 (iii) shield that can block gamma ray (e) green synthesis (iv) a fuel for a nuclear reactor (v) used in a smoke detector 5. Give one word for each of the following descriptions: (a) The cycle of natural pathways in which essential elements of living matter circulate (b) Lowering the pH of the ocean by the uptake of carbon dioxide from the atmosphere (c) Radioactive decay by which the nucleus of an unstable atom loses energy (d) A process by which substances are broken down by the action of sunlight (e) A chemical used to kill pests Chemistry Grade 12
- Question 25 of 25 Determine the rate of a reaction that follows the rate law: rate=k[A]^m[B]^n where: k=1.5 [A]=1M [B]=3M m=2 n=1 A. 4.5(mol/L)/s B 9.0(mol/L)/s c 13.5(mol/L)/s D 1.5(mol/L)/s