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alekssr [168]
3 years ago
13

Question 4 what is the term for a group of atoms held together by covalent bonds that bears an overall negative or positive char

ge? formula unit polyatomic ion molecule monoatomic ion none of the above
Chemistry
1 answer:
erma4kov [3.2K]3 years ago
4 0
Should be a polyatomic ion
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A sample of cesium carbonate, weighing 3.80 g, requires 1.90 g of hydrogen bromide gas to completely decompose to water, cesium
vladimir1956 [14]

Answer:

Choice A. 0.50 g.

Explanation:

According to the question, the reaction here converts

  • caesium (cesium) carbonate and
  • hydrogen bromide

to

  • cesium bromide,
  • carbon dioxide, and
  • water.

By the Law of Conservation of Mass, matter can neither be created nor destroyed in a chemical reaction. (Shrestha et. al, Introductory & GOB Chemistry, Chemistry Libretexts, 2019.)

In other words, the mass of the reactants, combined, shall be the same as the mass of the products, combined.

What's the mass of the reactants?

\rm \underbrace{\rm 3.80\;g}_{\mathrm{Cs_2CO_3}} + \underbrace{\rm 1.90\; g}_{\mathrm{HBr}} = 5.70\;g.

What's the mass of the products?

Let m(\mathrm{CO_2}) represent the mass of carbon dioxide produced in this reaction.

The mass of the products will be:

\rm \underbrace{\rm 5.20\;g}_{\mathrm{CeBr}\text{ and }\mathrm{H_2O}} + \underbrace{m(\mathrm{CO_2})}_{\mathrm{CO_2}}.

The two masses shall be equal. That is:

\rm 5.20\; g + \mathnormal{m}(\mathrm{CO_2}) = 5.70\;g.

m(\mathrm{CO_2}) = \rm 0.50\;g.

In other words, by the Law of Conservation of Mass, the mass of carbon dioxide produced in this reaction will be \rm 0.50\;g.

8 0
4 years ago
How are half-reaction useful?
Snezhnost [94]

Answer:

Half-reactions are often used as a method of balancing redox reactions. For oxidation-reduction reactions in acidic conditions, after balancing the atoms and oxidation numbers, one will need to add H + ions to balance the hydrogen ions in the half reaction.

Explanation:

8 0
3 years ago
Read 2 more answers
How do you find the value of 3A+6|C|?
Andrei [34K]

Answer:

tanong po sa ipis

Explanation:

because of the gravity of the earth

4 0
4 years ago
In the reversible reaction in water solution nh3 + h2o ⇀↽ nh+ 4 + oh− , what acts as a bronsted-lowry acid and what acts as a br
Masja [62]
The equation is:
NH₃     + H₂O     ↔    NH₄⁺          +       OH⁻
base       acid            conj. acid        conj. base

NH₃ is the proton acceptor so it considered as Bronsted-Lowry base and H₂O is proton donor so it considered as Bronsted-Lowry acid 

NH₃ when accepted H⁺ it converted into NH₄⁺ (conjugate acid) and H₂O when losing H⁺ it converted into OH⁻ (conjugate base)

The question asks for acid and base 
1) OH⁻ base, H₂O acid
2) H₂O acid, OH⁻ base
3) H₂O acid , NH₄⁺ acid
4) OH⁻ base, NH₄⁺ acid
5) NH₃ base, H₂O acid

so the correct answer is 2) because it is the only one containing acid then base
8 0
3 years ago
Why is water almost always a solvent with dissolved solutes in it?
Genrish500 [490]

Answer:

Water is a good solvent for ionic compounds as the amount of energy released by forming ion-dipole interactions between water molecules and charged ions is sufficient to compensate for the amount of energy required to break ionic bonds (aka lattice energy) between charged ions in the ionic compound and hydrogen bonds between water molecules.

Water however, is not a good solvent for organic compounds and metals...

8 0
3 years ago
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