Question 1 of 8Separation techniques
20 free questions here · 131 in the Danho app
Questions on this topic only, marked as you go. This is the same experience as the app.
Which process involves a change of state?
Which method is not suitable for separating a mixture of sand and water?
An example of a solid with a giant molecular structure is
Which pair correctly describes the structure of an atom?
The table shows information about the subatomic particles of two species, X and Y.
An ion of an element X is represented as follows, with W above and to the left of the symbol, Y above and to the right, and Z below and to the left.
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 protons but different numbers of neutrons. Which two structures together represent a pair of isotopes?
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 of four hydrogen atoms. What is the name of this compound?
Methane (CH4) is the covalent compound formed when atom A in Fig. 1 bonds with four hydrogen atoms. Which of the following statements about methane is correct?
Chlorine-35, ³⁵Cl, has atomic (proton) number 17. State the number of neutrons in one atom of chlorine-35.
Which statement correctly describes a difference between a chlorine atom, Cl, and a chloride ion, Cl⁻?
Carbon tetrachloride, CCl4, is a liquid at room temperature while calcium chloride, CaCl2, is a solid. This is because...
An element X has the electron configuration 2, 8, 3. In which period of the periodic table is X located?
An element X has the electron configuration 2, 8, 3. State, in one word, whether X is a metal or a non-metal.
Which of the following correctly defines the term diffusion?
Cotton wool soaked in concentrated ammonia is placed at one end of a glass tube, and cotton wool soaked in concentrated hydrochloric acid is placed at the other end. White fumes of ammonium chloride form off-centre in the tube, closer to the hydrochloric acid end. This happens because...
Element E has an electron arrangement of 2,8,7 across its three shells. What is the number of protons in atom E?
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 particles of D in its elemental form?
A mixture of sand and salt solution is to be separated so that the sand is left behind as a residue while the salt solution passes through. Name the separation method used.
An ion X has 8 protons, 8 neutrons and a charge of 2-. An ion Y has 13 protons, 14 neutrons and a charge of 3+. State the formula of the compound formed when X and Y combine.
Danho has every question on this topic, not just the sample above, with your progress tracked question by question, offline.