Answer:
1. The kinetic energies of the particles (atoms, molecules, or ions) that make up a substance. Kinetic energy tends to keep the particles moving apart.
2. The attractive intermolecular forces between particles that tend to draw the particles together.
Answer:
100.14°C
Explanation:
The boling point elevation is a colligative property that describes the increasing in boiling point of a solution regard to the boiling point of the pure solvent. The equation is:
ΔT = Kf*m*i
<em>Where ΔT is boiling point elevation</em>
<em>Kf is boiling point elevation (0.51°C/m for water)</em>
<em>m is molality of the solution (7moles Ba(NO3)2 / 75kg = 0.09333m</em>
<em>i is Van't Hoff factor = 3 for Ba(NO3)2 (Because its dissolution produce 3 ions = Ba²⁺ and 2 NO₃⁻</em>
<em />
Replacing:
<em> </em>ΔT = 0.51°C/m*0.09333m*3
ΔT = 0.14°C is the boiling point elevation
As the boiling point of water is 100°C, the boiling point of the solution is:
100°C + 0.14°C =
<h3>100.14°C</h3>
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Answer:
Dung dịch nào sau đây chỉ chứa các ion (bỏ qua sự điện li của nước, các chất điện li mạnh phân li hoàn toàn)?
A. HBr, Na2S, Mg(OH)2, Na2CO3.
B. H2SO4, NaOH, NaCl, HF.
C. HNO3, H2SO4, KOH, K2SiO3.
D. Ca(OH)2, KOH, CH3COOH, NaCl.
Answer:
There are four laws of thermodynamics that define fundamental physical quantities (temperature, energy, and entropy) and that characterize thermodynamic systems at thermal equilibrium.
Explanation:
B. static friction occurs.
Explanation:
When a body is pushed and it does not move, static friction has occurred.
Static friction is a type of friction that keeps a body at rest. It must be overcome before a body at rest can start moving.
- An object in motion experiences a sliding friction.
- Friction is generally defined as the resistance to motion of a body.
- In fluids, it is generally experienced as the viscosity.
- Static friction is the strongest of all the friction.
Learn more:
Friction brainly.com/question/7174363
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