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3 years ago

Need help with chem! (multiple choice)

Chemistry

2 answers:

tia_tia [17]3 years ago

7 0

Answer:

Explanation:

Atoms undergoing alpha decay lose 2 protons and two neutrons to become a different atom. Those two protons and neutrons are represented by an α (the symbol for alpha) particle which also represents a helium nucleus (2 neutrons and 2 protons).

Cerrena [4.2K]3 years ago

4 0

C because of what she said

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Group the following electron configurations in pairs that would represent similar chemical properties at their atoms;

marishachu [46]

Answer: Pairs are: (a) and (d), (b) and (f), (c) and (e)

Explanation:

In a periodic table, elements are arranged in 18 vertical columns known as groups and 7 horizontal rows known as periods.

Elements arranged in a group show similar chemical properties because of the presence of same number of valence electrons.

Valence electrons are defined as the electrons which are present in the outermost shell of an atom. Outermost shell has the highest value of 'n' that is principal quantum number.

For the given options:

For a:

The given electronic configuration is: $1s^22s^22p^63s^2$

The number of valence electrons in the given configuration are 2

For b:

The given electronic configuration is: $1s^22s^22p^63s^3$

The number of valence electrons in the given configuration are [2 + 3] = 5

For c:

The given electronic configuration is: $1s^22s^22p^63s^23p^64s^23d^{10}4p^6$

The number of valence electrons in the given configuration are [2 + 6] = 8

For d:

The given electronic configuration is: $1s^22s^2$

The number of valence electrons in the given configuration are 2

For e:

The given electronic configuration is: $1s^22s^22p^6$

The number of valence electrons in the given configuration are [2 + 6] = 8

For f:

The given electronic configuration is: $1s^22s^22p^63s^23p^3$

The number of valence electrons in the given configuration are [2 + 3] = 5

Electronic configuration of (a) and (d) will form a pair, (b) and (f) will form a pair, (c) and (e) will form a pair and will have similar chemical properties.

Hence, the pairs are: (a) and (d), (b) and (f), (c) and (e)

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3 years ago

Why can water pass through sandstrone but not through shale

Valentin [98]

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3 years ago

What would you expect to happen to the energy while a piece of paper is burning?

abruzzese [7]

D.

Energy cannot be created nor destroyed. It is just transferred through sound, heat and light.

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3 years ago

Read 2 more answers

chlorine has an average atomic mass of 35.45 amu. the two naturally occurring isotopes of chlorine are clorine-35 and chlorne -3

Licemer1 [7]

Answer:

See below.

Step-by-step explanation:

The two isotopes are Cl-35 and Cl-37.

The average atomic mass (35.45 u) is closer to 35 u, so most of the atoms are Cl-35.

mass number = number of protons + number of neutrons

A = p + n

35 = 17 + n

n = 35 – 17

n = 18

∴ Most chlorine atoms contain 18 neutrons.

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3 years ago

Chemical reaction NaCl (aq) + AgNO 3 (aq) → AgCl (s) + NaNO 3 (aq) is:

Vikentia [17]

Answer:

This reaction is both precipitation reaction as well as double displacement reaction.

In a double displacement reaction the anions are exchanged and in a precipitation reaction, a precipitate is formed in the end. In this case, AgCl is the precipitate.

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