Which answer best describes the potential energy diagram for a reaction that takes place in water, if the temperature of the surrounding water is lowered? a. the potential energy of the reactants is low; the potential energy increases gradually; it peaks, then decreases slightly.
b.the potential energy of the reactants is high; the potential energy decreases gradually; then increases slightly.
c. the potential energy of the reactants is low; the potential energy remains low; rapidly peaks, then rapidly falls.
d. the potential energy of the reactants is low; the potential energy decreases gradually; then increases slightly.
Answers
Answer:
d. the potential energy of the reactants is low; the potential energy decreases gradually; then increases slightly.
Explanation:
Potential energy is the term that refers to the energy stored in a body, which can be used for several different things, even if transformed into other types of energy, depending on the need that that body presents at the moment. If the body needs to move, for example, the potential energy is transformed into kinetic energy. If the body needs to heat up or cool down, the potential energy turns into thermal energy.
Based on this, we can conclude what happens to the potential energy of a reaction that occurs in water, when the temperature of the surrounding water is reduced. If the temperature is reduced, it means that the water is losing energy and the potential energy of the reagents is low; as a result, the potential energy gradually decreases; then it increases a little.
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What is the volume of an object whose dimensions are 5.54 cm, 10.6 cm, and 199 cm?
A farmer had an accident and spilled a chemical into his pond. Several days later, he notices many dead frogs around the pond. That summer, the number of gnats around the pond was higher than ever. This is becausea. the chemical is good for the gnats. b. the frogs are a limiting factor for the gnats. c. the gnats are a limiting factor for the frogs. d. the chemical is a limiting factor for the gnats.
The name of a water solution of hydrogen fluoride, HF(g), is (A) fluoric acid (B) fluorous acid (C) perfluoric acid (D) hydrofluoric acid (E) hypofluorous acid
adiation is spontaneously emitted from hydrogen-3 nuclei, but radiation is not spontaneously emitted from hydrogen-1 nuclei or hydrogen-2 nuclei. Which hydrogen nuclei are stable
Answers
The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
What is Alchemy ?
Alchemy began to fully evolve into chemistry in the 17thcentury, with a greater emphasis on rational thought and experimentation and less emphasis on spirituality and mysticism.
The alchemists were never successful in changing lead into gold, but modernnuclear physics can accomplish this task.
Therefore , The best statement among the following which explains whether alchemy is a science or pseudoscience is "It is pseudoscience because each metal is known to be a unique element." Hence, Option (D) is correct.
Learn more about Alchemy here ;
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Answers
Half-life is the time required for the amount of a sample to half its value.
To calculate the fraction of the sample remained unchanged, we will use the following formulas:
1.
where:
n - a number of half-lives
x - a remained fraction of a sample
2.
where:
t - total time elapsed
n - a number of half-lives
The half-life of N-16 is 7.13.
So, we know:
t = 28.8 s
We need:
n = ?
x = ?
We could first use the second equation, to calculate n:
If:
Then:
⇒
⇒
⇒ n ≈ 4
Now we can use the first equation to calculate the remained amount of the sample.
⇒
⇒
If the fraction of the sample is 1/16 = 6.25%, then the mass of the sample could be calculated as:
x g : 6.25% = 60 g : 100%
x =
Answers
Answer: B. A great deal of heat must be absorbed by water to break hydrogen bonds and allow molecules to move farther apart.
Explanation:
Vaporization is a physical process where liquid state changes to gaseous state.
Water molecules are bonded by strong hydrogen bonding between the hydrogen atom and the electronegative oxygen atom. Thus water molecules present on the surface are strongly attracted by the molecules present below the surface.
Thus as liquid state has to be changed to gaseous state, the heat must be supplied and the reaction will be endothermic.The heat is used to break the inter molecular forces or the hydrogen bonds present in water to convert them to randomly moving gaseous state.
(2) A positively charged nucleus is surrounded by mostly empty space.
(3) A negatively charged nucleus is surrounded by positively charged particles.
(4) A negatively charged nucleus is surrounded by mostly empty space.
Answers
Answer is: 2) A positively charged nucleus is surrounded by mostly empty space.
Rutherford theorized that atoms have their charge concentrated in a very small nucleus.
This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).
Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.
That is different from Plum Pudding model, because it shows that most of the atom is empty space.
The conclusion about the structure of the atom as the result of the gold foil experiment is that a positively charged nucleus is surrounded by mostly empty space. The answer is number 2. Also, he concluded that an atom was not an empty space but rather, the electrons are scattered.
What is the [H+] after the change?
Answers
H increases, Kw is constant, therefore
And you will have
Answer:
2
Explanation:
Answers
Answer:
A molecule with hydrogen bonded to to O, N, or F
Explanation:
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