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3 years ago

What is the 2nd most abundant element in the earths crust

Chemistry

1 answer:

Elza [17]3 years ago

3 0

Silicon is the second most abundant element in the Earth´s crust and makes up around 27% of it.

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Which statements best describes a major difference types of elements

Sever21 [200]

Answer:

The atoms of different elements have different numbers of protons and electrons.

6 0

3 years ago

Which of the following is not a statement of Dalton's atomic theory of matter?a. Elements are made of atomsb. Atoms of a given e

Alona [7]

Answer:

c. The atoms of one element can be identical to the atoms of another element.

Explanation:

Which of the following is not a statement of Dalton's atomic theory of matter?

a. Elements are made of atoms. TRUE. An atom is the smallest particle of a chemical element that can exist.

b. Atoms of a given element are identical. TRUE. The only slight difference is in the mass of isotopes.

c. The atoms of one element can be identical to the atoms of another element. FALSE. The atoms of different elements are different from one to another.

d. A given compound always has the same number and kinds of atoms. TRUE. This is known as Dalton's law of constant composition.

3 0

3 years ago

Express 0.08010 in exponential notation to the proper significant figures

nataly862011 [7]

This would be 8.010 * 10^-2

3 0

3 years ago

Is 2 KNO₃ + H₂CO₃ → K₂CO₃ + 4 HNO₃ a balanced equation

krok68 [10]

Hey there!

The elements in this equation are K, N, O, H, and C.

Let's count how many of each are on each side to see if it is balanced.

K: 2 on the left, 2 on the right.

N: 2 on the left, 4 on the right.

O: 9 on the left, 6 on the right.

H: 2 on the left, 4 on the right.

C: 1 on the left, 1 on the right.

Notice that there are different amounts of N, O, and H on the left side and the right side.

This means that the equation is not balanced.

Hope this helps!

6 0

3 years ago

Name two compounds with more exothermic lattice energies than scandium oxide and justify your choice.

N76 [4]

Answer:

1 . $Al_2O_3$

2. $TiO_2$

Explanation:

The more stable the ionic compound, the more is it lattice energy.

The more the charge on the cation and the anion, the greater is the lattice energy.
The less the size of the cation and the anion, the greater is the lattice energy.

Scandium oxide ( $Sc_2O_3$ ) is an oxide in which $Sc^{3+}$ behaves as cation and $O^{2-}$ behaves as anion.

The compounds which has higher lattice energy than scandium oxide are:

1 . $Al_2O_3$

This is because the charge are same on the cation and the anion as in the case of the Scandium oxide but the size of the cation $Al^{3+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

2. $TiO_2$

This is because the charge on the cation $Ti^{4+}$ is greater than that of $Sc^{3+}$ and also the size of the cation $Ti^{4+}$ is smaller than $Sc^{3+}$ . Thus, this corresponds to higher lattice energy.

3 0

3 years ago