Answer: The correct option is B.
Explanation: Pure substances are defined as the substances which are made up of one one type of atom or a molecule. Example: Iron (Fe), etc.
Option A: These substances can be cut into smaller pieces because only the size of the substance is changing.
Option B: All the pure substances are made up of atoms and group of atoms known as molecules. So, this is common to all the pure substances.
Option C: These substances can be mixed with other substance. For example: Iron can be mixed with another Copper.
Option D: These substances when undergoing a chemical reaction will change its chemical composition.
Hence, the correct option is B.
Answer:
All properties of matter are either physical or chemical properties and physical properties are either intensive or extensive. ... Physical properties can be measured without changing a substance's chemical identity. Chemical properties can be measured only by changing a substance's chemical identity.
Explanation:
Answer:
The correct answer is 12.43 Liters.
Explanation:
Based on the given question, the volume V₁ occupied by the sample of carbon dioxide gas is 14.2 liters at temperature (T₁) 65 degree C or 65+273 K = 338 K.
The gas is cooled at a temperature (T₂) 23 degree C or 273+23 K = 296 K
The volume of the gas (V₂) after cooling can be determined by using the formula,
V₁/T₁ = V₂/T₂
14.2/338 = V₂/296
0.0420 = V₂/296
V₂ = 0.0420 * 296
V₂ = 12.43 Liters.