Answer:
B) The molecules were closer together when the juice pop was frozen.
The type of reaction that occurs without the addition of heat is called spontaneous reaction. That is option D.
<h3>What is spontaneous reaction?</h3>
Spontaneous reaction is defined as the reaction where by new substances are formed naturally without the addition of extra energy in the form of heat.
Therefore, the type of reaction that occurs without the addition of heat is called spontaneous reaction
Learn more about heat here:
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To calculate the percent
of the radioactive isotope rhenium after 3 half-lives is
(1/2)^3 = 0.125 x 100 =
12.5%
We calculate that there
is 12.5% percent activity of the radioactive isotope.
<span>Radioactive isotope
other called as radioisotope, radioactive nuclide or radionuclide, in any of
the several species of the same chemical element with different masses whose
nuclei are unstable and dissipate excess energy by spontaneously emitting
radiation in the form of gamma, alpha and beta rays. Rhenium is a chemical element
and has an atomic number of 75. Its chemical symbol is Re. It is in the
third-row transition metal in group 7 of the periodic table.</span>
Answer:
Pressure = 4313.43mmHg
Explanation:
P1 = ?
V1 = 0.335L
V2 = 1700mL =1700*10^-3L = 1.7L
P2 = 850mmhg
From Boyle's law, the volume of a fixed mass of gas is inversely proportional to its pressure provided that temperature remains constant.
P = k / v
K = pv. P1V1 = P2V2 = P3V3 =........=PnVn
P1V1 = P2V2
Solve for P1,
P1 = (P2*V2) / V1
P1 = (850 * 1.7) / 0.335
P1 = 4313.43mmHg
The pressure of the gas was 4313.43mmHg