1. Some Basic Concepts of Chemistry Flashcards
Name 2 life saving drugs effective in cancer therapy -
Cisplatin and taxol
________ is used for helping AIDS victims.
AZT (Azidothymidine)
________ have definite volume but not definite shape.
Liquid
Properties of a compound are different from its constituent elements. T/F
T
Physical properties can be measured or observed without changing the identity or the composition of the substance. T/F
T
Name the 7 SI base units.
m. kg, sec, Ampere, Kelvin, mole, candela
Prefix used for 10-¹⁵ is -
Femto
Prefix used for 10-¹² is -
Pico
Prefix used for 10-⁹ is -
Nano
Prefix used for 10-⁶ is -
Micro
Sl unit of mass is gram T/F
F
Write relation between °F and °C scale.
°F (9/5)°C+32
- Accuracy/Precision refers to the closeness of various measurements for the same quantity.
Precision
What is Accuracy?
Accuracy is the agreement of a particular value to the true value of the result
All non-zero digits are significant. T/F
T
Zeros preceding the first non-zero digit are significant. T/F
F
Zeros between two non-zero digits are not significant. T/F
F
Zeros at the end or right of a number are significant, provided they are on the right side of the decimal point. T/F
T
Significant figures in e (Euler Number) is -
∞
According to significant figures, 2.5 × 2.50 =
6.2
According to significant figures, 1.5 × 70 =
1.0 × 10
Law of conservation of mass was given by -
Antoine Lavoisier
Law of Definite proportions given by -
Joseph Proust
Law of multiple proportions given by -
Dalton
“Equal volumes of all gases at the same temperature and pressure should contain an equal number of molecules.” This statement was given by -
Avogadro
1 amu = kg
1.66 x 10-24 kg
Define Mole
One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of carbon-12 isotope
Mass % =
(Mass of solute/mass of solution) × 100
Mole fraction =
No. of moles of solute/(Moles of solute + Moles of solvent)
Molarity =
No. of moles of solute/Volume of solution in litres
Molality = ______ (NEET 2022)
No. of moles of solute/Mass of solvent in kg
Molarity changes with change in temperature. T/F
T
Dalton’s atomic theory, regarded the atom as an ultimate particles of matter T/F (NEET 2023)
T
