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daser333 [38]
3 years ago
15

Select all the statements that accurately describe chemical reactions: Question 2 options: The number of atoms decreases when a

compound is formed There is the same amount of matter before and after the reaction The atoms are arranged into different compounds or molecules after the reaction The substances in the reaction only undergo a physical change There are the same types and numbers of atoms before and after the reaction
Chemistry
1 answer:
Lemur [1.5K]3 years ago
5 0

Answer:

There is the same amount of matter before and after the reaction

The atoms are arranged in different compounds and molecules.

There are the same types and number of atoms before and after the reaction

Explanation:

--The same amount of matter before and after the reaction and the same types and number of atoms before and after the reaction is because of the law of conservation of mass. Matter cannot be created or destroyed.

--the reacting atoms and molecules will undergo a transformation to different molecules and compounds. Can be predicted because of the types of chemical reactions:

combination (combining 2 elements to create a new compound)

Decomposition (a compound breaking down into different parts)

Single and Double displacement (the molecules/ atoms will change who they are paired with)

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Composition of the nuclei of two atomic species A and B are given below:
Inessa [10]

Explanation:

(a) mass number = atomic number + number of neutrons

(the atomic number is the number of protons of an element)

mass number of A = 11 + 12 = 23

mass number of B = 17 + 18 = 35

(b) +1 and -1, respectively

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2 years ago
14
Bond [772]

Answer:

Explanation:

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This means phenol is a solid

Duodecane has melting point below 25 °C hence it is either a liquid or gas. However its boiling point of 216 °C means it would require higher temperature to boil it. Since 25 °C is less than 216 °C it means that it would remain in the liquid state.

Methane has melting point below 25 °C hence it is either a liquid or gas. However its boiling point of -164 °C means it boils easily even at very low temperatures. Since 25 °C is greater than -164 °C it means that it would exist in the gaseous state

8 0
3 years ago
A small portion of a crystal lattice is sketched below. What is the name of the unit cell of this lattice? Your answer must be a
Nikolay [14]

This is an incomplete question, the given sketch is shown below.

Answer : The name of given unit cell is, FCC (face-centered cubic unit cell)

Explanation :

Unit cell : It is defined as the smallest 3-dimensional portion of a complete space lattice which when repeated over the and again in different directions produces the complete space lattice.

There are three types of unit cell.

  • SCC (simple-centered cubic unit cell)
  • BCC (body-centered cubic unit cell)
  • FCC (face-centered cubic unit cell)

In SCC, the atoms are arranged at the corners.

Z=\frac{1}{8}\times 8=1

The number of atoms of unit cell = Z = 1

In BCC, the atoms are arranged at the corners and the body center.

Z=\frac{1}{8}\times 8+1=2

The number of atoms of unit cell = Z = 2

The given unit cell is, FCC because the atoms are arranged at the corners and the center of the 6 faces.

Z=\frac{1}{8}\times 8+\frac{1}{2}\times 6=4

The number of atoms of unit cell = Z = 4

Thus, the name of given unit cell is, FCC (face-centered cubic unit cell)

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3 years ago
What is the relationship between mole, Avogadro number and mass?
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Answer:

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5 0
2 years ago
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