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3 years ago

The main building block of a silicate mineral is _____.

Chemistry

2 answers:

galben [10]3 years ago

8 0

The main building block of all silicate mineral is tetrahedron

baherus [9]3 years ago

4 0

Answer:

silicon-oxygen tetrahedron is the correct answer.

Explanation:

The main building block of a silicate mineral is silicon-oxygen tetrahedron. Silicon-oxygen tetrahedron belongs to the anionic group and the silicon atom is surrounded by four oxygen atom, arranged to determine the edges of a tetrahedron.

This silicate ion consists of one silicon atom, placed in the middle of a tetrahedron and surrounded by four oxygen atom, placed at vertices of a tetrahedron.

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How many electrons are in the outermost energy level in argon

rodikova [14]

The atomic number tells you the number of electrons. That means there are 18 electrons in an argon atom.

4 0

4 years ago

What is the correct unabbreviated electron configuration of the following?:

Rudik [331]

The correct unabbreviated electron configuration is as below

Vanadium - 1S2 2S2 2P6 3S2 3p6 3d3 4s2

Strontium - 1s2 2S2 2P6 3S2 3P6 3d10 4S2 4P6 4S2

Carbon =1S2 2S2 2P2

Explanation

vanadium is in atomic number 23 in the periodic table hence its electron configuration is 1s2 2s2 2p6 3s2 3p6 3d3 4s2

Strontium is in atomic number 38 in periodic table hence its electron configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4s2

Carbon is in atomic number 6 in periodic table therefore its electron configuration is 1s2 2s2 2p2

5 0

4 years ago

Watching the assignment without knowing how to solve the questions is the worst thing to experience hope someone can help with t

frez [133]

Answer:

- 622.5kJ

Explanation:

1) 2NH3 + 3N2O ----> 4N2 + 3H2O ΔH° 1= - 1010kJ

- 3 (N2O + 3H2 ---> N2H4 + H2O ΔH° 2 = - 317 kJ)

2) 2NH3 + 3N2O ----> 4N2 + 3H2O ΔH° 1= - 1010kJ

- 3N2O - 9 H2 ----> - 3N2H4 - 3H2O - 3ΔH° 2 = 3*317 kJ

2NH3 + 3N2H4 --->4N2+9H2, ΔH° 1 - 3*ΔH° 2

2NH3 + 3N2H4 --->4N2+9H2, ΔH° 1 - 3*ΔH° 2

3) -(2NH3 +1/2O2 ---> N2H4 + H2O, ΔH°3 = -143 kJ)

-2NH3 - 1/2O2 ---> - N2H4 - H2O, - ΔH°3 = 143 kJ

2NH3 + 3N2H4 --->4N2+9H2, ΔH° 1 - 3*ΔH° 2

-2NH3 - 1/2O2 ---> - N2H4 - H2O, - ΔH°3 = 143 kJ

4N2H4 + H2O ---> 4N2 + 9H2 + 1/2O2, ΔH° 1 - 3*ΔH° 2 - ΔH°3

H2 + 1/2O2 ---> H2O, ΔH° 4 = - 286 kJ

9*(H2 + 1/2O2 ---> H2O, ΔH° 4 = - 286 kJ)

9H2+ 9/2 O2 ---> 9H2O, 9*ΔH° 4 = 9*(- 286) kJ

4N2H4 + H2O ---> 4N2 + 9H2 + 1/2O2, ΔH° 1 - 3*ΔH° 2 - ΔH°3

9H2+ 9/2 O2 ---> 9H2O, 9*ΔH° 4 = 9*(- 286) kJ

4N2H4 +4O2 --->4N2+8H2O, ΔH° 1 - 3*ΔH° 2 - ΔH°3 + 9*ΔH° 4

1/4*(4N2H4 +4O2 --->4N2+8H2O, ΔH° 1 - 3*ΔH° 2 - ΔH°3 + 9*ΔH° 4

N2H4 +O2 --->N2+2H2O, 1/4( ΔH° 1 - 3*ΔH° 2 - ΔH°3 + 9*ΔH° 4)

N2H4 +O2 --->N2+2,

1/4( ΔH° 1 - 3*ΔH° 2 - ΔH°3 + 9*ΔH° 4)=

=1/4(-1010kJ - 3*(-317kJ) - (-143kJ) + 9*(-286kJ))= - 622.5 kJ

7 0

3 years ago

Design techniques and materials that reduce the negative environmental

Scrat [10]

Answer:

Green design

Explanation:

The word ‘Green’ represents designs which are eco friendly and less harmful to humans and other organisms. It helps in the protection of natural resources such as water, air etc.

Green Design are also referred to as techniques and materials that reduce the negative environmental impact of a structure.

3 0

4 years ago

If you have 200 grams of SO4, how many molecules of SO4 will you have?

den301095 [7]

Answer:

2.08 moles

Explanation:

number of molecules = mass / molecular mass of SO₄

number of molecules = 200 g / 96.06 g/mol

number of molecules ≈ 2.08

6 0

3 years ago

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