Chemistry
Name the following:
(a) A polyatomic positive ion.
(b) The substances written on the left side of an arrow in an equation.
(c) The substances which are formed during a chemical reaction.
(d) An unbalanced chemical equation.
(e) An atom or group of atoms that behave as a single charged unit.
(f) A substance used to increase the rate of reaction.
Related Questions
Write 'true' or 'false' for the following and correct the false statements.
(a) When an atom gains one or more electrons, it becomes positively charged.
(b) The valency of nitrogen in ammonia gas is 3.
(c) The sulphide ion is a polyatomic ion.
(d) The nitrate ion is represented as NO2-.
(e) The element cobalt is represented as CO.
Match the following:
Column A Column B (a) Combining capacity of an element (i) Silicon dioxide (b) The radical/ion formed due to the loss of electrons (ii) Molecular formula (c) Symbolic representation of a compound (iii) Calcium carbonate (d) Marble (iv) Valency (e) Sand (v) Cation Write the names of the following ions:
(a) HCO3-
(b) MnO4-
(c) N3-
(d) Cr2O72-
Write the names of the compounds represented by the following formulae :
(a) K2CO3
(b) P2O5
(c) H2S
(d) Ca(OH)2
(e) CuSO4
(f) SiO2