Answer:
0.897 J/g.⁰C
Explanation:
Given the following data:
m = 170 g (mass)
ΔT = 20.0⁰C (change in temperature)
q = 3050 J (amount of heat)
The amount of heat (q) is calculated as follows:
q = m x Cp x ΔT
Thus, we introduce the data in the mathematical expression to calculate the specific heat (Cp):
Cp = q/(m x ΔT) = 3050 J/(170 g x 20.0⁰C) = 0.897 J/g.⁰C
Modern atomic theory is, of course, a little more involved than Dalton's theory but the essence of Dalton's theory remains valid. Today we know that atoms can be destroyed via nuclear reactions but not by chemical reactions. Also, there are different kinds of atoms (differing by their masses) within an element that are known as "isotopes", but isotopes of an element have the same chemical properties.
Many heretofore unexplained chemical phenomena were quickly explained by Dalton with his theory. Dalton's theory quickly became the theoretical foundation in chemistry.
Answer:
The pH o.s the s.u.b.st.a.n.c.e is 1,92.
Explanation:
pH = -log (H +)= -l.o.g (1.2 x 10^-2 )=1,92
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Answer:
6.02 x 10²³ electrons
Explanation:
Given parameters:
Mass of H₂ = 2g
Unknown:
Number of electrons = ?
Solution:
To find the number of electrons, we must determine the number of moles of H₂ first.
Number of moles = 
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = 
= 1mol
1 mole of a substance contains 6.02 x 10²³ particles
the particles can be protons, neutrons, electrons
So,
2g of H₂ will contain 6.02 x 10²³ electrons.
Correct Answer: option
B: <span> helium and hydrogen
Reason:
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The nebular hypothesis is the most widely accepted theory that explains the formation and evolution of the Solar System. It was proposed by I. Kant. According to this theory, Solar System formed from nebulous material. Further, according to the nebular hypothesis, stars form the massive and dense clouds of molecular hydrogen.
