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Four properties of water are listed. It has high thermal conductivity. It reacts with metals to form metal hydroxide and hydrogen gas. When heated to 100 °C, water evaporates. It decomposes to form hydrogen and oxygen. Which are the chemical properties of water? 1 and 2 1 and 3 2 and 3 2 and 4

Respuesta :

Aaryan00
2nd and 4th properties are chemical properties
Edufirst

Answer:

The chemical properties are then number 2 and 4:

  • It reacts with metals to form metal hydroxide and hydrogen gas.
  • It decomposes to form hydrogen and oxygen.

Justification:


The chemical properties can only be observed when the substance undergoes a chemical change, which is that the substance is transformed into one or more different substances.  As result of a chemical change, the composition of the former substance changes, braking some chemcial bonds and formng new ones.


The number 1 states that the water reacts with metals to form metal hydroxide, meaning that the water is transformed into a new substance, the composition will not be H₂O andy more, since the atoms will be combined with atoms of different elements. Same, can be told about the number 2, which states that hydrogen and oxygen were obtained when water decomposed.


On the other hand, the thermal conductivity of water and the boiling point (the temperature at which the water evaporates) can be measured without changing the composition of the water, so those are physical properties.

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