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The diagram shows a chromatogram obtained using solutions of four single dyes. Which solution is impure?
The diagram shows ammonium chloride being heated. Which process is taking place?
The diagram shows a chromatogram of the dyes present in five different inks. What is the total number of different dyes in all the five…
The graph shows a cooling curve of a substance, P. Section YZ represents
Which one is an example of a change of state?
Which is the best way to test for the purity of propanoic acid?
Which process involves a change of state?
Which change of state represents sublimation?
Which method is not suitable for separating a mixture of sand and water?
An investigation to identify the ink used to make a fake one hundred dollar note using paper chromatography was carried out. The…
Which gas has the smallest rate of diffusion?
Which gas has the fastest rate of diffusion?
The diagram shows a chromatogram obtained using solutions of three single dyes (blue, green and red) and four other solutions (A, B, C and…
When liquid water changes into steam, the molecules
An amino acid has an R_f value of 0.75. Which of the components A, B, C or D in the chromatogram could be the amino acid?
An example of a solid with a giant molecular structure is
Which pair correctly describes the structure of an atom?
Which diagram correctly represents a sulphide ion, S^{2-}?
Fig. 1 shows structures of four atoms/ions, A, B, C and D, drawn as nucleus-and-shell diagrams. Structures A and D have the same number of…
In the Contact process for manufacturing sulfuric acid, Fig.5's flow diagram shows sulfur and dry air entering box A; the process proceeds…
In Fig. 1, atom A forms a covalent compound with hydrogen, shown by a dot-and-cross diagram in which A shares one electron pair with each…
Chlorine-35, ³⁵Cl, has atomic (proton) number 17. State the number of neutrons in one atom of chlorine-35.
A student added black copper(II) oxide powder to nitric acid, forming a blue solution P containing copper(II) ions. Which other substance…
An element X has the electron configuration 2, 8, 3. In which period of the periodic table is X located?
Which of the following correctly defines the term diffusion?
Element E has an electron arrangement of 2,8,7 across its three shells. What is the number of protons in atom E?
A burette containing sodium hydroxide solution, NaOH(aq), is clamped above a conical flask containing dilute sulfuric acid, H2SO4(aq), with…
Methane (CH4) is the covalent compound formed when atom A in Fig. 1 bonds with four hydrogen atoms. Which of the following statements about…
Which statement correctly describes a difference between a chlorine atom, Cl, and a chloride ion, Cl⁻?
Write a balanced chemical equation, with state symbols, for the reaction between zinc granules and copper(II) sulfate solution.
An element X has the electron configuration 2, 8, 3. State, in one word, whether X is a metal or a non-metal.
Cotton wool soaked in concentrated ammonia is placed at one end of a glass tube, and cotton wool soaked in concentrated hydrochloric acid…
Element D has an electron arrangement of 2,8,2 across its three shells, and exists as a solid metal. What type of bonding exists between…
In a titration where sodium hydroxide solution, NaOH(aq), is added from a burette into a conical flask containing dilute sulfuric acid,…
Which of the following Period 3 oxides is amphoteric, reacting with both acids and bases?
Carbon tetrachloride, CCl4, is a liquid at room temperature while calcium chloride, CaCl2, is a solid. This is because...