3 years ago

How do you know if a chemical change has taken place?

1 answer:

6 0

There are a few ways to tell if a reaction has taken place, these include temperature change, color change, formation of a precipitate, bubbling, and even odors. These all indicate that a chemical change has taken place.

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Why is hydrogen placed above the alkali metals, on the periodic table?

Dmitriy789 [7]

Well most gases are lighter then metals:D

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3 years ago

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How does the difference in electronegativity values determine the type of bond that occurred? Ionic or covalent

Alenkasestr [34]

The more electronegativity atom attracts electrons more strongly and gains a slightly negative charge, the less electronegative atom has a slightly positive charge.

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4 years ago

what is the difference between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminum

igomit [66]

Answer:

The atomic number of Selenium is 34. This means that Selenium possesses 34 electrons.

The atomic number of Aluminium is 13. This means that Aluminium has 13 electrons.

Hence, there is a difference of 21 between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminium.

Selenium has 6 electrons in it's outer most shell whereas aluminium has 3 electrons in its outer most shell. As a result, aluminium will have a greater tendency to lose one of its outer most electrons to become stable.

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3 years ago

In the mass spectrum of the molecule phenol, C6H5OH, the approximate intensity of the peak at m/z 95, relative to the molecular

klasskru [66]

The correct answer to thi

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4 years ago

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

saveliy_v [14]

Answer: the momentum is 6 Kgm/s

Explanation:

M= 5 kg

V= 1.2 m/s

Momentum = MV = 5 x 1.2 = 6 Kgm/s

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3 years ago