Answer:
irreversible changes
Explanation:
Most chemical changes are permanent and cannot be reversed. That is because a chemical change involves changing the molecular composition which can't be reversed. A common example of a chemical change would be burning wood. The wood burning into ash is changing the molecular composition of the wood transforming it to ash. Now can ash be changed back into wood? No, it is a "irreversible change."
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<u>Answer:</u> The molarity of saline solution is 0.909 M
<u>Explanation:</u>
We are given:
5.21 w/w % NaCl
This means that 5.21 grams of NaCl is present in 100 grams of solution
To calculate mass of a substance, we use the equation:
Density of solution = 1.02 g/mL
Mass of solution = 100 g
Putting values in above equation, we get:
To calculate the moalrity of solution, we use the equation:
Given mass of NaCl = 5.21 g
Molar mass of NaCl = 58.44 g/mol
Volume of solution = 98.04 mL
Putting values in above equation, we get:
Hence, the molarity of saline solution is 0.909 M
The theory of inheritance was proposed by Walter Sutton and Theodor Boveri
the chromosome theory is a principal of genetics, known as the chromosome theory of inheritance, The principal is that all chromosomes are carriers of genetic material that pass from one generation to the next.
Answer:
both are chemical changes
Potassium Iodide or KI is an ionic compound and dissolves to water since the two are polar substances. Like dissolves like. As KI is dissolved into water, the KI molecules dissociates into ions, the K+ and I- ions. Water molecules can stabilize these ions. The K+ ions attracts the negative side of H2O molecules which is the oxygen side while the I- ions attracts the positive side of H2O molecules or the hydrogen side.
