Chemistry, 04.10.2019 23:30 adriannar20011

Which statement describes a chemical property of water?
it reacts with sodium metal.
it has a melting point of 0°c.
it has a density of about 1 g/ml.
it is clear and colorless.

Answers: 2

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The chemical description of water is H2O, which means, it is composed of 2 hydrogen atoms and 1 oxygen atom. The answer to this item is the fourth option, " It is clear and colorless." When water is added with calcium, clear, colorless bubbles are formed. This explains a reaction of water with acid. The following are additional facts about water properties: Density: 1 g/cm³ Boiling point: 100 °C Molar mass: 18.01528 g/mol Melting point: 0 °C Formula: H2O

Answer from: germaine88

first option, It reacts with sodium metal.

Explanation:

Chemical properties are those manifested only as part of a chemical reaction, which means that the composition of the molecules of water will change: some chemical bonds are broken and others are formed, transforming some pure substances (elements, like sodium, or compounds, like water) into one or more different pure substances.

Water has the ability to react with sodium metal for form sodium hydroxide and hydrogen gas, according to this reaction:

Na(s) + H₂O (l) → NaOH (aq) + H₂ (g).

The products formed have different composition and different physical and chemical properties than the reactants from which they originated from. This is what a chemical change means.

2) On the other hand, the melting point of 0°C, the density of about 1 g/mL, and that it is clear and colorless, are all physical properties, because they can be assesed without changing the composition of water.

Answer from: Quest

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.

Answer from: Quest

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

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Which statement describes a chemical property of water?
it reacts with sodium metal.
it...

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