If X-Y-Z and XZ = 3√5 and xy = √5 then complete the following activity to find Yz.
Answers
TRINITY LYCEUM, KOLLAM
FIRST TERMINAL EXAMINATION, AUGUST 2021-2022
STANDARD VIII
MARKS: 50
TIME: 1 HOUR
SECTION A (30 Marks)
Attempt All Questions
1) Name or state the term for the following: [1 x 5 = 5]
a) The state of matter having maximum compressibility.
b) A general name for electron that takes part in a chemical reaction.
c) Elements having valency 0.
d) A solid that melts at O0
C.
e) The element which does not contain any neutron in its nucleus.
2) Fill in the blanks: [1 x 5 = 5]
a) Metals …………… electrons and get converted into cations.
b) Mass of the atom is concentrated inside the ………….. of an atom.
c) The mass of electron is considered as …………..
d) The superscript on ‘n’ represents its ………….
e) The subscript number of ‘p’ represents its …………..
3) Name the process when the following changes take place. [1 x 5 = 5]
a) Size of naphthalene balls decreases.
b) Solid wax in the sun.
c) Drying of wet clothes.
d) The level of nail polish remover in the bottle decreases when exposed to air.
e) Water vapour to water by cooling.
4) An element X has atomic number 17. Answer the following questions based on this. [1 x 6 = 6]
a) Write its electronic configuration.
b) What is its valency?
c) Define valency.
d) Is it a metal or non-metal?
e) Write the name of element X.
5) Match the elements A to E in List 1 with their valency in List 2 and nature in List 3. [1 x 5 = 5]
LIST 1 (Elements) LIST 2 (Valency) LIST 3 (Nature)
A) Z=7, A = 14 1) 3 METAL
B) Electronic configuration
– 2,8
2) 1 NON-METAL
C) 6n, 6e 3) 2 NOBLE GAS
D) 12n, 12p 4) 4
E) Electronic configuration
– 2,8,1
5) 0