CHEMISTRY HIGH SCHOOL

Which type of bonding involves positive ions immersed in a sea of mobile electrons?

Answers

Answer 1
Answer: The answer is a metallic bond. This type of bond is considered to be a lattice of positive ions immersed in a sea of electrons. Common features of materials with metallic bonds are being a good electrical and thermal conductors, opaque and are ductile.

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Which element in the second period has the largest atomic radius? a potassium (K) b neon (Ne) c carbon (C) d lithium (Li)

Answers

The element in the second period that has the largest atomic radius is the Lithium (Li). The answer is letter D. As you go down the periodic table, the atomic radius increases and as you go across the periodic table, the atomic radius decreases.

Answer:

d lithium (Li)

Explanation:

Which element has properties most similar to Bromine? A) F
B) Kr
C) S
D) Se

Answers

Fluorine (F) will have properties similar to Bromine (Br) because it belongs to the same group as Bromine.
the correct answer is flourine

Which of the following best describes solids?A. Solids are low in density and compressible.
B. Solids are high in density and compressible.
C. Solids are low in density and incompressible.
D. Solids are high in density and incompressible.

Answers

Answer: Option (D) is the correct answer.

Explanation:

Solids are the substances whose molecules are closely packed together due strong inter molecular forces between them. This causes the solid to have a fixed shape and volume.

Whereas density is mass divided by per unit volume.

Mathematically,         Density = (mass)/(volume)

Since, density is proportional to mass. So, more is the mass that is, more is the number of molecules held together by strong forces more will be its density.

Therefore, we can conclude that the statement solids are high in density and incompressible, best describes solids.
In my opinion I would pick D. 

Multiple answers could be chosen, just due to the fact that a solid is nothing more than just an object that cannot change it's physical shape into an object; just as water would. a solid can have a low density; such as paper, plastics, or even just a piece of wood. 

But think of a block of ice. You can break it, and crush it. It cannot be formed into any other shape. If you did break it, it only would make more ice fragments. And it's next phase is a liquid; if it were to be melted.

Given: The equation for the synthesis of ammonia is H2(g) + N2(g) → NH3(g). If 12.0 grams of hydrogen are used up by the reaction, how many grams of ammonia will be produced?

Answers

Answer:

The answer to your question is 68 g

Explanation:

Data

mass of H₂ = 12 g

mass of NH₃ = ?

Balanced chemical reaction

               3H₂  +  N₂   ⇒   2NH₃

Process

1.- Calculate the molar mass of H₂

H₂ = 1 x 6 = 6

NH₃ = 2[(14 x 1) + (3 x 1)]

       = 2[14 + 3]

       = 2[17]

       = 34 g

2.- Use proportions to find the mass of NH₃

                 6 g of H₂ --------------- 34 g of NH₃

                12g of H₂ ----------------  x

                        x = (12 x 34) / 6

                        x = 408/6

                        x = 68 g of NH₃

One of the of sulfur is represented as sulfur-35 or S- 35. What does the number 35 signify?

Answers

35 is the mass number of this isotope of Sulphur. 
the mass number of an isotope of sulphur i.e number of neutron has increase changing it from 32 to 35 bt the atomic number remains the same i.e 16
hope this helps*winks*

What can be determined if only the atomic number of an atom is known?(1) the total number of neutrons in the atom, only
(2) the total number of protons in the atom, only
(3) the total number of protons and the total number of neutrons in the atom
(4) the total number of protons and the total number of electrons in the atom

Answers

Answer;

(4) the total number of protons and the total number of electrons in the atom

Explanation;

-Atomic number is the number of protons in the nucleus of an atom. An atom is made up of energy shells and the central nucleus. The energy shells contains electrons that are negatively charged while the nucleus contains protons (positively charged) and neutrons (neutral).

-In a neutral atom, the number of protons and electrons are equal, thus the atomic number would indicate the number of electron and protons in an atom. The sum of protons and neutrons on the other hand gives the mass number.

It is the "(4) the total number of protons and the total number of electrons in the atom" that can be determined if only the atomic number of an atom is known.
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