1.) Which of the following is a molecule but not a compound?
A.He
"He" or helium is an initial for a single element and a compound has more than one element.
2.) What is a physical combination of substances?
A.a mixture
When two substances are combined they result in a compound.
3.) What is a chemical combination of substances?
A. they form a compound
When two chemical elements are combined they form a compound.
4.) What is the relationship between the solute and solvent in a solution?
B.they form a mixture
Solutes are dissolved into the solvent which results in a mixture.
3.
N₂H₄ is a weak base and a weak base does not dissociate completely, as represented by ↔.
Answer:
Iron is being oxidized. (Ans. B)
Explanation:
Half reaction is defined as either the reduction where electrons are gained or oxidation where electrons are lost of the redox reaction. Half reaction is produced by change in the oxidation state of individual molecule which is involved in the redox reaction.
A good example of redox reaction is known as rusting. In this process oxygen take electrons from iron, then iron gets oxidized, and oxygen gets reduced. This process results the compound known as rust, or iron oxide.
Fe----> Fe2+ +2e-.
The heat released from the calculation is 33.56 kJ.
<h3>Heat of vaporization</h3>
The heat of vaporization is the heat absorbed when a substance changes from liquid to vapor. It is equal to the heat released when the vapor is condensed.
The total heat released = Heat of condensation + Heat lost to the skin
= (13.3 g × 2260 J/g) + (13.3 g × 4.18 J/g/°C × ( 100 - 37)°C)
= 30058 + 3502
= 33.56 kJ
The heat released from the calculation is 33.56 kJ.
Learn more about heat of vaporization: brainly.com/question/2427061
Since we are basing the rate with respect to O3, therefore
the rate would simply be the concentration divided by the total reaction time.
That is:
rate of reaction = 0.05 M / 16 seconds
rate of reaction = 3.125 x 10^-3 M / second
or
<span>rate of reaction = 0.003125 M / second</span>
