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dem82 [27]
3 years ago
7

Which fact about fuel cells is FALSE?

Chemistry
1 answer:
soldier1979 [14.2K]3 years ago
5 0

Answer: Option (d) is the correct answer.

Explanation:

An electrochemical cell with the help of which chemical energy of a fuel (generally hydrogen) and an oxidizing agent (generally oxygen) are converted into electrical energy by a pair of redox reactions.

A fuel cell is able to generate electricity as long as fuel and oxygen are supplied to it.

As, hydrogen and oxygen are generally used as a fuel so, this results in the formation of water as a by-product.

Thus, we can conclude that the statement fuel cell automobiles are powered by water and the only emission is hydrogen, is FALSE about fuel cells.

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A high school chemistry student wishes to demonstrate how water can be separated into hydrogen and oxygen by electrolysis. She k
Inessa05 [86]

Answer:

H2SO4

Explanation:

An electrolyte is a chemical compound that conducts electricity by changing into ions when melted or dissolved into a solution. An example of an electrolyte is sodium chloride.

Strong acids such as sulfuric acid (H2SO4), and strong bases such as potassium hydroxide (KOH), and sodium hydroxide (NaOH) are frequently used as electrolytes due to their strong conducting abilities.

4 0
3 years ago
What are the roles of fungi? Check all that apply.
dmitriy555 [2]

Answer:

Fungi are a food source for animals and humans. This point do not apply on fungi.

Explanation:

Roles of fungi:

Penicillin and Cephalosporins are the antibiotics made by fungi. They are natural sources of antibiotics.

Fungi are eaten by animals  examples are mushroom, agaricus and some animals even eat poisonous mushrooms.

Fungi destroy by releasing chemicals into the rock and they get iron this way and then deeply burrow the rocks and harming them.

Fungi acts as a decomposer to nourish the soil and improves vegetation.

Many infections are caused by fungus like ringworm infection, candida and Athlete's food are some examples.

4 0
3 years ago
The Nuremberg War Crimes trials established
ra1l [238]
The Nuremberg War Crimes trials established the international legal precedent that individuals who violate human rights can be held responsible for their actions. The correct option in regards to all the options given in the question is option "2". The Nuremberg trials were held against the Germans by the Allied forces against the war crimes done by the Germans during World War II. Many of the allied countries were in favor of killing the war criminals before any trial, but ultimately the trial was held and the criminals were either hanged to death of were killed by the firing squad.


7 0
4 years ago
Considering the following precipitation reaction: Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq) Which ion would NOT be present in
Allisa [31]

Answer:

The question is incomplete and confusing.

  • In the complete ionic equation you write all the ions that are formed. Those are: Pb²⁺, NO₃⁻, K⁺, and I⁻. They all are present in the complete ionic equation.

  • In the net ionic equation, the spectator ions do not appear. They are: NO₃⁻ and K⁺. They would not be present in the net ionic equation, but they do in the complete ionic equation.

See below the details.

Explanation:

Which compound will not form ions?

<u />

<u>1. Write the balanced molecular equation:</u>

  • Pb(NO₃)₂(aq) + 2KI(aq) → PbI₂(s) + 2KNO₃(aq)

<u />

<u>2. Write the ionizations for the ionic aqueous compounds:</u>

<u />

  • Pb(NO₃)₂(aq) →  Pb⁺²(aq) + 2NO₃⁻(aq)

  • 2KI(aq) → 2K⁺(aq) + 2I⁻(aq)

  • 2KNO₃(aq) → 2K⁺(aq) + 2NO₃⁻(aq)

<u />

<u>3. Write the complete ionic equation:</u>

Pb⁺²(aq) + 2NO₃⁻(aq) + 2K⁺(aq) + 2I⁻(aq) → PbI₂(s) +  2K⁺(aq) + 2NO₃⁻(aq)

Hence, since PbI₂(s) does not ionize, but stays in solid form, it will not form ions.

All, Pb⁺², NO₃⁻, K⁺, and I⁻ will be present in the total ionic equation.

It is in the net ionic equation that the spectator ions are removed. Those, are NO₃⁻ and K⁺, because they are on both sides of the complete ionic equation.

3 0
3 years ago
Need help fast
vovangra [49]

Answer:

B

Keep the temperature at 20°C. Stir the solution

Explanation:

3 0
3 years ago
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