Answer: This is because, the stem symbolises the bronchioles of the lung through which oxygen is transfered to the lungs. The grabes represent the lungs, left and right respectively.
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c. the answer is radioactive elements are useful for dating materials
Concentration of the solution (% mass) = 4%
<h3>Further explanation</h3>
<em>Rosa prepared a salt water solution by mixing 120 mg of water with 5 mg of common salt, what concentration is the solution she prepare?</em>
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mass solute=mass of salt=5 mg
mass solution :
mass solute(salt)+mass solvent(water) :
Answer: strong electrolyte.
Justification:
1) Lithium chloride is an ionic compound, highly soluble in water.
2) This is the chemical equation:
LiCl(aq) → Li⁺ (aq) + Cl⁻ (aq)
3) Due to its ionic character and the small size of the ion Li⁺, LiCl dissociates almost completely, meaning the the solution is a strong electrolyte.
4) Electrolytes are solutions that carry electricity (the iones, charged species, are the carrierr of the electricity)
