Some Basic Concepts of Chemistry — Flashcards
Punjab Board · Class 11 · Chemistry
32 flashcards for Some Basic Concepts of Chemistry (Punjab Board Class 11 Chemistry) to test yourself on key terms and facts.
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What is the difference between an element and a compound?
Answer
Element: A pure substance containing only one type of atom. Examples: Iron (Fe), Oxygen (O₂), Copper (Cu). Atoms of one element cannot be separated by physical methods. Compound: A pure substance for…
Define mixture. What are the two types of mixtures?
Answer
Mixture: A combination of two or more pure substances in any proportion where components retain their individual properties. Types: 1. Homogeneous Mixture: Components uniformly distributed throughout…
What are the three states of matter and their characteristics?
Answer
1. Solid: Definite shape and definite volume. Particles are tightly packed in orderly arrangement. Particles have very limited movement. Example: Ice, salt crystal. 2. Liquid: Definite volume but no …
Convert 25°C to Kelvin and Fahrenheit.
Answer
Given: Temperature in Celsius = 25°C Conversion to Kelvin: K = °C + 273.15 K = 25 + 273.15 = 298.15 K ≈ 298 K Conversion to Fahrenheit: °F = (9/5)(°C) + 32 °F = (9/5)(25) + 32 °F = (225/5) + 32 °F =…
Calculate the density of an object with mass 50 g and volume 25 cm³.
Answer
Formula: Density = Mass / Volume Given: Mass = 50 g Volume = 25 cm³ Solution: Density = 50 g / 25 cm³ Density = 2 g/cm³ To convert to SI units (kg/m³): 2 g/cm³ × 1000 = 2000 kg/m³ Answer: 2 g/cm³ …
How many significant figures are in the following numbers? (a) 0.0052 (b) 2.005 (c) 100.0
Answer
Significant figures rules: - Non-zero digits are always significant - Zeros between non-zero digits are significant - Leading zeros are NOT significant - Trailing zeros after decimal point ARE signifi…
Express 0.000456 in scientific notation.
Answer
Scientific notation format: N × 10ⁿ where 1 ≤ N < 10 For 0.000456: Step 1: Move decimal point to get a number between 1 and 10. Move decimal 4 places to the right: 4.56 Step 2: Count the places move…
Convert 2.5 liters to cubic centimeters and cubic meters.
Answer
Given: Volume = 2.5 L Conversion to cm³: 1 L = 1000 cm³ 2.5 L = 2.5 × 1000 = 2500 cm³ Conversion to m³: 1 L = 0.001 m³ (or 1 L = 10⁻³ m³) 2.5 L = 2.5 × 0.001 = 0.0025 m³ Alternatively: 2500 cm³ = 2…
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