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Travka [436]
3 years ago
8

Which of these elements has two valence electrons? A.hydrogen B.barium C.nitrogen D.krypton E.bromine

Chemistry
1 answer:
Umnica [9.8K]3 years ago
3 0

Answer:

Barium

Explanation:

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Water is classified as an inorganic compound because it
vladimir2022 [97]
Because it contains hydrogen which isn't formed by a special process like oxygen
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2 years ago
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Chemist preformed Reaction of solid magnesium burning and found that the mass of the magnesium oxide what is greater than the ma
tankabanditka [31]

Answer:

The magnesium reacted with the oxygen in the air.

Explanation:

For argument’s sake, let’s say that the mass of magnesium oxide was 3 g and that of the oxide was 5 g.  

The reaction was

            magnesium + oxygen ⟶ magnesium oxide

Mass:           3 g                                          5 g

Mass of oxygen = 5 g – 3 g = 2 g

The 3 g of magnesium must have combined with 2 g of oxygen to form 5 g of magnesium oxide.

4 0
3 years ago
Write the simple equation that describes the action of the enzyme catalase.
Nataly [62]

Here we have to write a simple equation which describes the action of the enzyme catalase.

The equation is: The concentration of the complex [ES] = \frac{[E]0}{1+\frac{Km}{[S]} }

Let us consider an enzyme catalyses reaction E + S ⇄ ES → E + P

Where E, S, ES and P are enzyme, substrate, complex and product respectively.

The concentration of the complex [ES] = \frac{[E]0}{1+\frac{Km}{[S]} }, where K_{m} is the Michaelis constant.

[E]₀ and [S] is the initial concentration of enzyme and concentration of substrate respectively.    

5 0
3 years ago
The ammonia molecule in the diagram has the observed bond orientation because ...
aivan3 [116]

Answer:

  • Nitrogen has four pairs of electrons: 3 bonds and 1 lone pair in the valence shell;
  • Electrons repel one another based on the VSEPR theory;
  • Nitrogen has a total of 7 protons (its atomic number is 7) in its nucleus.

Explanation:

The shape and the bond orientation of molecules and ions are both explained by the valences shell electron pair repulsion theory (VSEPR).

Ammonia, NH_3, is a molecule which contains three N-H bonds, as well as one lone pair on nitrogen. According to the VSEPR theory, molecules try to acquire a shape which would minimize the repulsion exhibited by the electron clouds present, that is, between the bonding (shared in a bond) and non-bonding (lone pair) electrons.

In VSEPR, our main step is to calculate the steric number, this is the sum of the number of bonds (ignoring the multiplicity of any bond) and the lone pairs on a central atom. In ammonia, we have 3 bonds and 1 lone pair, totaling to a steric number of 4. A steric number of 4 without any lone pairs on a central atom and just bonds would yield a tetrahedral shape with bond angles of 109.5^o.

Now, in this case, since we have a lone pair instead of a bond, it is repelling stronger decreasing the bond angles to about 107^o.

The greater the number of lone pairs, the lower the angle becomes.

To summarize:

  • Nitrogen has four pairs of electrons: 3 bonds and 1 lone pair in the valence shell;
  • Electrons repel one another based on the VSEPR theory;
  • Nitrogen has a total of 7 protons (its atomic number is 7) in its nucleus.
3 0
3 years ago
What is the product of the unbalanced combustion reaction below?
bezimeni [28]

Answer:

C

Explanation:

because it is complete combustion so it will produced CO2 +H2O :)

7 0
3 years ago
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