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Olegator [25]
3 years ago
14

How many moles are in silicon dioxide if the mass is 3.4x10-7

Chemistry
1 answer:
Kisachek [45]3 years ago
3 0

Answer:

28 as compare to ul formula

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Use the periodic table to identify the element indicated by each electron configuration by typing in the chemical symbol for the
Marina CMI [18]
To determine what elements are represented by the electron configuration given above, we need to know the sum of the exponents of each term or subshell involved in the configuration as this represent the atomic number of the element.

                                                                 Atomic Number          Element
<span>1s2 2s2 2p6:                                      2 + 2 + 6 = 10                         neon
1s2 2s2 2p6 3s2 3p3:            </span>2 + 2 + 6 + 2 + 3 = <span>15                  phosphorus
1s2 2s2 2p6 3s2 3p6 4s1: </span>2 + 2 + 6 + 2 + 6+1 = <span>19                    potassium
1s2 2s2 2p6 3s2 3p6 4s2 3d8:              20 + 8 =  28                    nickel
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d3:  30 + 6 + 2 +3 = 41                    niobium</span>
3 0
3 years ago
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What happens to the reaction c2h6 + 137 kj c2h4+h2 when the temperature of the reaction is increased?
Softa [21]
Answer is: at higher temperatures reaction will go to the right (forward), more products (C₂H₄ and H₂) will be produce, because this is endothermic reaction (ΔH<span> is positive, </span>energy is consumed) and according Le Chatelier's principle <span>heat is included as a reactant. </span> .
4 0
3 years ago
Which of the following types of molecules always has a dipole moment? Linear molecules with two identical bonds. Trigonal pyrami
natali 33 [55]

Answer:

Trigonal pyramid molecules (three identical bonds)

Explanation:

In trigonal pyramidal molecule  like molecule of ammonia , the vector some of intra- molecular dipole moment is not zero because the bonds are not symmetrically oriented . In other molecules , bonds are symmetrically oriented in space so the vector sum of all the internal dipole moment  vectors cancel each other to make total dipole moment zero.

8 0
3 years ago
You want to create a special device to keep coffe warm which type of electromatic wave use
Karolina [17]

<em> Infrared Waves</em> is the answer

Let me know if this helps..

3 0
3 years ago
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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction
Marianna [84]
<h3>Answer:</h3>

                      2 C₃H₈O  +  9 O₂    →    6 CO₂  +  8 H₂O

<h3>Explanation:</h3>

This is the combustion reaction in which Isopropanol, an organic compound is burnt in the presence of Oxygen to produce Carbon dioxide and water vapors.

The General reaction is as,

                Isopropanol  +  Oxygen    →    Carbon dioxide  +  Water

Chemical formulae of above compounds and molecule are,

Isopropanol =  C₃H₈O

Oxygen  =  O₂

Carbon Dioxide  =  CO₂

Water  =  H₂O

Hence, the balance chemical equation can be written as,

                      2 C₃H₈O  +  9 O₂    →    6 CO₂  +  8 H₂O

4 0
3 years ago
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