Answer: True
Explanation:
Physical change is a change in which there is no rearrangement of atoms and thus no new substance is formed. There is only change in physical state of the substance.
Chemical change is a change in which there is rearrangement of atoms and thus new substance is formed. There may or may not be a change in physical state.
Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change is true as solid changes to liquid state and there is no breaking or making of chemical bonds.
Answer:
A) wrong. The molar is same so A is hevier
B)
Explanation:
Xg/mol × (same molar)= g
→ bigger molar bigger mass
Answer:
Explanation:
Balance equaion of the given reacion is:
⇄
lets solubility is S
given:
Solubility of each ion;
after putting value of S the value of Ksp is:
Upto 2 significant figure:
Answer:
1 ⇒ A
2 ⇒ B
3 ⇒ D
4 ⇒ C
Explanation:
We use the Freezing point depression to solve this:
Freezing T° pure solvent - Freezing T° of solution = Kf . m . i
1. Potassium acetate:
0°C - Freezing T° of solution = 1.86°C/m . 0.24m . 2
KCH₃COO → K⁺ + CH₃COO⁻ i = 2
Freezing T° of solution = -1.49°C (A)
2. Aluminum nitrate:
0°C - Freezing T° of solution = 1.86°C/m . 0.11m . 4
Al(NO₃)₃ → Al³⁺ + 3NO₃⁻ i= 4
Freezing T° of solution = -0.82°C (B)
3. Chromium (II) nitrate
0°C - Freezing T° of solution = 1.86°C/m . 0.13m . 3
Cr(NO₃)₂ → Cr²⁺ + 2NO₃⁻ i= 3
Freezing T° of solution = - 0.72°C (D)
4. Ethylene glycol(nonelectrolyte) → I = 1
0°C - Freezing T° of solution = 1.86°C/m . 0.41m . 1
Freezing T° of solution = - 0.76°C (C)