If these are you choices:
(1) Both the solid and the liquid are good conductors.
(2) Both the solid and the liquid are poor conductors.
(3) The solid is a good conductor, and the liquid is a poor conductor.
(4) The solid is a poor conductor, and the liquid is a good conductor.
Then the answer is number 4. This is because ionic compound conducts electricity when it is dissolved in water.
The students with ionic bonds have a better understanding of what the model needs to illustrate.
Explanation:
- When ionic compounds dissolve in water, they break apart into the ions that make them up through a process called dissociation.
- When placed in water, the ions are attracted to the water molecules, each of which carries a polar charge.
- If the force between the ions and the water molecules is strong enough to break the bonds between the ions, the compound dissolves.
- The ions dissociate and disperse in solution, each ringed by water molecules to prevent reattachment.
- The ionic solution turns into an electrolyte, meaning it can conduct electricity.
- While covalent compounds dissolve in water they break apart into molecules, but not individual atoms.
- Water is a polar solvent, but covalent compounds are usually nonpolar.
- This means covalent compounds typically don't dissolve in water, instead making a separate layer on the water's surface.
Molar mass of TiCl₃ = (47.9 + 35.5×3) g/mol = 154.4 g/mol
No. of moles of TiCl₃ = (380 g) / (154.4 g/mol) = 2.46 mol
1 mole of TiCl₃ contains 1 mole of Ti.
No. of moles of Ti needed = (2.46 mol) × 1 = 2.46 mol
Molar mass of Ti = 47.9 g/mol
Mass of Ti needed = (2.46 mol) × (47.9 g/mol) = 118 g
1kg = 1000grams
<span>mass of uranium = 235
number of atoms in 1 mole = avogadro's number = 6.02 x 10</span>²³
<span>Each nucleus will release = 200 Mev of energy.
So, E = 200 x (1000/235) x 6.02 x 10</span>²³
= 5.12 x 10²⁶<span> Mev
Now convert this to joules
1Mev = 1.60218 x 10</span>⁻¹³
5.12 x 10²⁶ Mev = 5.12 x 10²⁶ Mev x 1.60218 x 10⁻¹³
= 8.21 x 10¹³ Joules
Answer: Option (2), (3) and (5).
Explanation:
Chemical change: It is a chemical reaction in which arrangement of atoms of one or more than one substance changes to give new substances as a product.Chemical change can be in form of : color change, formation of precipitate, formation of bubbles.
In option (2), bubbles were produced when iron was placed in acid which means gas was released on adding iron to acid.Yes, it is a chemical change.
In option (3), solid that is precipitate is obtained as a product from the reaction between two liquids which means that change in arrangement of atom had taken place.Hence, a chemical change.
In option (5), white substance turned blue when water was added. Color of white solid changes to blue which means that chemical change has taken place.
So, option are (2), (3) and (5) are examples of chemical changes.
