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2 years ago

Which statement about atoms and molecules is

Chemistry

2 answers:

Pavel [41]2 years ago

8 0

Elements always exist as pair of atoms called molecules .

Explanation:-

The material which has only one types of similar atoms called element .
Ex:-Sodium,Carbon etc

zhuklara [117]2 years ago

3 0

Answer:

Elements always exists as pairs of atoms called molecules

Explanation:

Elements are simply substances in its pure form.
The atom of an element is simply referring to a single element. eg we have sodium atom as Na, it appears singly and in its pure form
A molecule then refers to when an atom of the same element is paired up. i.e not in a single state. eg, we have one atom of hydrogen molecule as H2, Oxygen molecule as O2.
Note. the molecular elements appear in pairs while the atomic elements appear singly.

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Help me please omg I don’t know

Anna35 [415]

Answer:

5 1 2 4and 3 this is correct way

8 0

2 years ago

Describe the structure of an Atom (HELP!)

Marat540 [252]

Answer:

The answer is A.

Explanation:

Neutrons and protons are located in the dense middle of the atom called the nucleus, and electrons are located on the electron cloud located outside of the nucleus.

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2 years ago

Part A Find ΔS∘ for the reaction between nitrogen gas and hydrogen gas to form ammonia: 12N2(g)+32H2(g)→NH3(g) Express your answ

inessss [21]

Answer:

$\Delta S^{0}$ for the given reaction is -99.4 J/K

Explanation:

Balanced reaction: $\frac{1}{2}N_{2}(g)+\frac{3}{2}H_{2}(g)\rightarrow NH_{3}(g)$

$\Delta S^{0}=[1mol\times S^{0}(NH_{3})_{g}]-[\frac{1}{2}mol\times S^{0}(N_{2})_{g}]-[\frac{3}{2}mol\times S^{0}(H_{2})_{g}]$

where $S^{0}$ represents standard entropy.

Plug in all the standard entropy values from available literature in the above equation:

$\Delta S^{0}=[1mol\times 192.45\frac{J}{mol.K}]-[\frac{1}{2}mol\times 191.61\frac{J}{mol.K}]-[\frac{3}{2}mol\times 130.684\frac{J}{mol.K}]=-99.4J/K$

So, $\Delta S^{0}$ for the given reaction is -99.4 J/K

7 0

3 years ago

A 0.0100 M solution of AgNO3 has a concentration of Ag ion equivalent to

qaws [65]

Answer:

0.0100M of AgNO3 contains 0.0100M of Ag+

Explanation:

AgNO3 when ionized yields Ag+ and NO3-. This means that the amount of AgNO3 in solution is equivalent to the amount of Ag+ and NO3- in that same solution.

1M of AgNO3 solution produces 1M of Ag+

1M of AgNO3 solution produces 1M of NO3-

This occurs because of the complete ionization of AgNO3 in solution, allowing complete dissolution of the compound.

6 0

2 years ago

Which mixture is salt solution

VARVARA [1.3K]

Answer:

Below

Explanation:

Salt solution, aka saline solution, is a homogeneous mixture. This means that the mixtures composition is completely uniform throughout. If you were to look at a saline solution, it would just look like plain water because the salt is dissolved (it looks the exact same in the entire mixture).

Something like bean soup would be an example of a heterogeneous mixture. You can see all the beans and vegetables as components of one mixture.

Hope this helps! Best of luck <3

4 0

2 years ago