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vfiekz [6]
4 years ago
14

Which of these contains only one substance?

Chemistry
1 answer:
oksano4ka [1.4K]4 years ago
3 0
Since Distiled water contains only water, the answer is A)
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Which describes an atom that has fewer neutrons than protons and more electrons than protons?
Eva8 [605]

Answer:

Option d is correct = Negative ion

Explanation:

We know that an atom consist of electrons, protons and neutrons. Neutrons and protons are present inside the nucleus while electrons are present out side the nucleus. Electron has a negative charge and is written as e⁻. The mass of electron is 9.10938356×10⁻³¹ Kg . While mass of proton and neutron is 1.672623×10⁻²⁷Kg  and 1.674929×10⁻²⁷ Kg  respectively.

Symbol of proton= P⁺  

Symbol of neutron= n⁰  

The number of electron or number of protons are called atomic number while mass number of an atom is sum of protons and neutrons. The  umber of protons and electrons are always equal to make the atom electrically neutral and when an atom loses its valance electron the number of protons increases and thus positive charge increased and atom form cation.

When an atom gain electron negative charge increase because of more number of electron thus atom form negative ion or anion. For example,

Anion formation:

X + e⁻ → X⁻

Cation formation:

X → X⁺ + e⁻

Thus option d is correct option.

5 0
4 years ago
PLEASE HELP ASAP . what else does this have??
Mice21 [21]

Answer:

decimal and unit ex 1.5 inches

7 0
3 years ago
How many moles of Ba(NO3)2 are there in 0.25 L of a 2.00 M Ba(NO3)2 solution?<br> Use mc007-1.jpg.
aleksandrvk [35]
Number of moles ( n )  = ?

Volume ( V ) = 0.25 L

Molarity of solution ( M )  = 2.00 M

n = M x V

n = 2.00 x 0.25

n = 0.5 moles of Ba(NO₃)₂

hope this helps!


7 0
3 years ago
Read 2 more answers
Magnesium (Mg) has an atomic number of 12. What is the ground-state electron configuration of magnesium?
Brums [2.3K]

C. 12222632

You have to follow the Aufbau principle, which states that electrons populate the atomic orbitals situated at the lowest energy first.


The orbitals are:

1

22

333

4444

5555

666

77

4 0
4 years ago
Read 2 more answers
The escape of molecules from the surface area of a liquid is known as
Tasya [4]

Answer:

Evaporation is a type of vaporization of a liquid that only occurs on the liquid's surface. Usually, the molecules in a glass of water do not have enough heat energy to escape from the liquid. With sufficient heat, however, the liquid would quickly turn into vapor.

Explanation:

Evaporation is a type of vaporization of a liquid that only occurs on the liquid's surface. Usually, the molecules in a glass of water do not have enough heat energy to escape from the liquid. With sufficient heat, however, the liquid would quickly turn into vapor.

8 0
4 years ago
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