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erastovalidia [21]
3 years ago
13

1. Butane has a chemical formula CH4H10. The equation 2C4H10 + 13O2 → 8CO2 + 10H2O represents which of these?

Chemistry
1 answer:
Eddi Din [679]3 years ago
3 0

1) Answer is: B) A chemical change of butane into other substances.

Balanced chemical reaction: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.

This is chemical change (chemical reaction), because two new substances are formed (carbon dioxide and waters), the atoms are rearranged and the reaction is followed by an energy change.

This is not physical change, because the same substance is present before and after the psysical change, just with different form or state of matter.

2) Answer is: A) It increases.

Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

Albert Einstein (1879-1955) proposed that a beam of light is a collection of discrete wave packets (photons) with energy hν, where h is Planck constant and ν is frequency.

Energy level 2 has higher energy than energy level 1.

3) Answer is: C) 400 kPa.

Boyle's Law (the pressure-volume law): volume of a given amount of gas held at constant temperature varies inversely with the applied pressure when the temperature and mass are constant.  

p₁V₁ = p₂V₂ (the product of the initial volume and pressure is equal to the product of the volume and pressure after a change).  

p₁ = 100 kPa; starting pressure.  

V₁ = 1.0 L., starting volume.

V₂ = 0.25 L; final volume, smaller than starting volume.

p₂ = ?; final pressure.  

100 kPa · 1 L = p₂ · 0.25 L.  

p₂ = 100 kPa · 1 L / 0.25 L.  

p₂ = 400 kPa.  

When volume goes up, pressure goes down.  

When volume goes down, pressure goes up.  

4) Answer is: C) HClO₄.

Balanced chemical reaction of dissociation of perchloric acid in water:

HClO₄(aq) → H⁺(aq) + ClO₄⁻(aq).

Ionic compounds (in this example perchloric acid) conduct electricity, because it dissociate in ions and ions conduct electicity.  

Ionic substances dissociate in water on cations and anions.  

Perchloric acid (HCO₄) is one of strongest inorganic acids.  

NH₃ is ammonia, NaOH is sodium hydroxide and NH₄OH ammonium hydroxide, all are bases.

5) Answer is: D) A and D.

A catalyst is a chemical species that is present at the beginning of a reaction and reappears at the end.

An intermediate forms during the reaction and disappears before the end.

Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst.

Reactions occur faster with a catalyst because they require less activation energy.

6) Answer is: D) H2O has stronger intermolecular force of attraction.

Intermolecular forces are the forces between molecules or particles.

Because of hydrogen bonds, water has higher melting and boiling temperatures than H₂S.

In molecule of water there are dipole-dipole forces between negatively charged oxygen from one molecule of water and positively charger hydrogen of another molecule of water.

Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.

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An electrochemical cell is composed of pure nickel and pure iron electrodes immersed in solutions of their divalent ions at room
Andrej [43]

Answer:

0.758 V.

Explanation:

Hello!

In this case, case when we include the effect of concentration on an electrochemical cell, we need to consider the Nerst equation at 25 °C:

E=E\°-\frac{0.0591}{n} log(Q)

Whereas n stands for the number of moles of transferred electrons and Q the reaction quotient relating the concentration of the oxidized species over the concentration of the reduced species. In such a way, we can write the undergoing half-reactions in the cell, considering the iron's one is reversed because it has the most positive standard potential so it tends to reduction:

Fe^{2+}+2e^-\rightarrow Fe^0\ \ \ E\°=0.440V\\\\Ni^0\rightarrow Ni^{2+}+2e^-\ \ \ E\°=-0.250V

It means that the concentration of the oxidized species is 0.002 M (that of nickel), that of the reduced species is 0.40 M and there are two moles of transferred electrons; therefore, the generated potential turns out:

E=(0.440V+0.250V)-\frac{0.0591}{2} log(\frac{0.002M}{0.40M} )\\\\E=0.758V

Beat regards!

8 0
3 years ago
_____________ is an acronym used to refer a family of iron alloys.
Daniel [21]

FeNi or NiFe is an acronym used to refer a family of iron alloys.

<h3>What is alloy?</h3>

An alloy is a mixture of chemical elements that contains at least one is a metal.

<h3>Alloy of iron</h3>

The alloy of iron-nickel can be abbreviated as FeNi, which implies iron-nickel.

where;

  • Fe stands for iron
  • Ni stands for Nickel

Thus, FeNi or NiFe is an acronym used to refer a family of iron alloys.

Learn more about iron alloys here: brainly.com/question/24842164

5 0
2 years ago
Which of the following is a challenge of prosthetic engineering that has been met through tissue engineering?
solniwko [45]

Answer:

biocompatibility

Explanation:

5 0
2 years ago
If two forces are heading in the same direction, we ______ them to calculate net force.
steposvetlana [31]

Answer:

add

Explanation:

5 0
3 years ago
The liquid dispensed from a burette is called ___________.
11Alexandr11 [23.1K]

The liquid that is been dispensed during titration as regards this question is Titrant.

  • Titration can be regarded as  common laboratory method that is been carried out during quantitative chemical analysis.
  • This analysis helps to know the concentration of an identified analyte.
  • Burette can be regarded as laboratory apparatus.

It is used in the in measurements of variable amounts of liquid ,this apparatus helps in dispensation   of liquid, especially when performing titration.

  • The specifications is been done base on their volume, or resolution.
  • The liquid that comes out of this apparatus is regarded as Titrant, and this is gotten during titration process, which is usually carried out during volumetric analysis.

Therefore, burrete is used in volumetric analysis.

Learn more at:

brainly.com/question/2728613?referrer=searchResults

8 0
3 years ago
Read 2 more answers
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