skgoldsmith

18.03.2021 • 

Chemistry

This chart lists four examples of objects that are in contact. Object
Example 1 Fire
Example 2 A metal at 80°C
Example 3 The cool ocean
Example 4 A tool with a lot of thermal
energy
Object 2
Air
A metal at 12°C
The warm air
A material with little thermal
energy
Which statement accurately describes the flow of heat in each example?
O Heat will flow from Object 1 to Object 2 in examples 2 and 4, and heat will flow from Object 2 to Object 1 in example
1 and 3.
O Heat will flow from Object 1 to Object 2 in examples 1 and 3, and heat will flow from Object 2 to Object 1 in example
2 and 4
O Heat will flow from Object 1 to Object 2 in Example 3, and heat will flow from Object 2 to Object 1 in examples 1, 2,
and 4.
O Heat will flow from Object 1 to Object 2 in examples 1, 2, and 4, and heat will flow from Object 2 to Object 1 in
Example 3.

Ответ:

wsdafvbhjkl

28.06.2022

Chemistry

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Subtract the number of valence electrons(outer most shell electrons) from the atomic number of an atom.

Explanation: The total number of electrons for an atom equals to its atomic number. Electrons are present in different shells. Electrons present in outer most shell(valence shell) are known as valence electrons and rest of the electrons present in inner shells are known as core electrons.

So, to determine the number of electrons we subtract the valence electrons from atomic number.

For example, atomic number of N (nitrogen) is 7. It has 5 valence electrons.

Number of core electrons for N = 7 - 5 = 2

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