Answer:
Unsaturated solution.
Explanation:
At 60°C, 100.0g of water can dissolve 110g of KNO₃.
By definition, if you add 110g of KNO₃, the solution will be saturated, if you add more than 110g, the solution becomes supersaturated (That means crystals of solute will form), if you add less than 110g, the solution is unsaturated.
In the problem, you are adding 80g of KNO₃(s), that means you made a unsaturated solution.
The [H+] in the solution is found using the Kw expression: Kw = [H+][OH-]. Since Kw is known and [OH-] is given, [H+] can be calculated.
The concentration of hydrogen ions ([H+]) in a solution can be determined using the equilibrium constant for water (Kw). Kw is the product of the concentrations of hydrogen ions and hydroxide ions ([OH-]) in the solution. At 25°C, Kw has a constant value of 1.0 x 10^-14. Thus, if the [OH-] concentration in the solution is known, the [H+] concentration can be calculated by dividing Kw by [OH-]. In this case, the [OH-] is given as 5.42 x 10^-5 M, so [H+] can be found by dividing 1.0 x 10^-14 by 5.42 x 10^-5, which gives a value of 1.84 x 10^-10 M. Therefore, the (Ht] in the solution is 1.84 x 10^-10 M.
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Electrons are the subatomic particles with the smallest mass.
Neutrons orbit the nucleus of the atom.
Subatomic particles all have the same mass.
Answer:
The second option - electrons are the subatomic particles with the smallest mass.
Explanation:
Uniform
Heterogeneous
Solutes
Homogenous
Answer: Heterogenous
Explanation:
A heterogenous mixture is one where the composition of matter is not uniform throughout.
Some examples of heterogenous mixtures include: chocolate chip cookies, salad dressing, strawberry yogurt
HCl
BrF
NO2
Answer:
He
Step-by-step explanation:
A postulate of the Kinetic Molecular Theory is that at a given temperature, the average kinetic energy of the molecules is directly proportional to the Kelvin temperature.
KE = ½ mv² ∝ T
mv² ∝ T Divide each side by T
v² ∝ T/m
If T is constant.
v² ∝ 1/m Take the square root of each side
v ∝ 1/√m
This is an inverse relationship, so the molecules with the smallest molecular mass should have the highest average speeds.
A helium molecule has the smallest mass, so helium has the highest average molecular velocity.
By definition, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
All atoms are composed of a central nucleus in which there are particles with a positive electric charge, the protons, and neutron, which is an electrically neutral subatomic particle, around which other particles with a negative electric charge that are electrons move.
Thus, the atom is electrically neutral, since the positive charge of the protons is compensated by the negative charge of the electrons.
Atoms of different elements have different amounts of protons. The atomic number (which is identified by the letter Z) indicates the amount of protons that is present in the nucleus of an atom.
This number is then responsible for defining the electronic configuration of the atom and the chemical properties of the element. Then it is possible to say that the number of protons in the nucleus, that is to say the atomic number Z, of an atom determines its identity.
Finally, the correct answer is option D. Scientists can identify an element by looking at the structure of a single atom because the number of protons can be determined, and thus its identity.
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