Which statement describes a chemical property of matter?
2 answers:
Answer: D. Sodium is a very reactive element that combines easily with nonmetals
Explanation:
Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.
Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.
A. The density of ice is 0.4 g/ml is a physical property.
B. The boiling point of ethanol is is a physical property.
C. Rust is a flaky material with an orange-red color is a physical property.
D. Sodium is a very reactive element that combines easily with nonmetals is a chemical property.
Thus the statement that describes a chemical property of matter is Sodium is a very reactive element that combines easily with nonmetals.
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Answer : The heat of the reaction is -221.6 kJ
Explanation :
Heat released by the reaction = Heat absorbed by the calorimeter
where,
= heat released by the reaction = ?
= heat absorbed by the calorimeter
= specific heat of calorimeter =
= change in temperature =
Now put all the given values in the above formula, we get:
As,
So,
Thus, the heat of the reaction is -221.6 kJ
Answer: The ionization of pure water forms <u><em>hydroxide and hydronium ions.</em></u>
Explanation:
Ionization is a reaction in the pure water in which water breaks down into its constituting ions that hydronium ion and hydroxide ions.
One molecule of water looses its proton to form hydroxide ion and l=the lost protons get associated with another water molecule to form hydronium ion.