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.
The nucleus controls what goes in and out of the cell.
Answer: sp2 hybridized orbital
Explanation:
The lone pair in pyridine is contained in an sp2 hybridized orbital pointing outwards from the ring. As a result, the lone pair does not contribute to the aromatic ring but still influences the properties of pyridine such as electrophilic attack. The image attached depicts the bonding in pyridine.
The value of Kc for the equilibrium is 0.150 mole² / litre ²
<u>Explanation:</u>
<u>Given:</u>
An equilibrium mixture in an 1.00 L vessel contains 5.30 moles of
Mg(OH )₂ 0.800 moles of Mg²⁺ and 0.0010 moles OH₋
We have to find the value of Kc
- Step 1: Find the equilibrium Concentration.
- Step 2: Substitute the values in the equation.
- Step 3: Find the value of Kc.
- I have attached the document for the detailed explanation
The value of Kc for the equilibrium is 0.150 mole² / litre ²