Explanation:
Intermolecular force s between particles in a matter holds particles of molecules together in substances.
- The stronger the intermolecular forces the more solid a substance is.
- The weakest intermolecular attraction are found in gases as they have negligible attractive forces in between their particles.
- Solids are held together by very strong attractive forces.
- Liquids have weak forces holding them in place and this allows for a little movement.
- Gases are typically have very weak to negligible attractive forces.
Answer:
37.5 mL of a 4.0 M Mg(OH)₂ are needed to make 750 mL of 0.2 M Mg(OH)₂
Explanation:
Dilution is the reduction in concentration of a chemical in a solution. Dilution consists of lowering the amount of solute per unit volume of solution.
In other words, dilution is the procedure followed to prepare a less concentrated solution from a more concentrated one, and consists of adding solvent to an existing solution. The quantity or mass of the solute is not changed but only that of the solvent.
In dilutions the expression is used:
Ci*Vi = Cf*Vf
where:
- Ci: initial concentration
- Vi: initial volume
- Cf: final concentration
- Vf: final volume
In this case:
- Ci: 4 M
- Vi: ?
- Cf: 0.2 M
- Vf: 750 mL
Replacing:
4 M* Vi= 0.2 M* 750 mL
Solving:
Vi= 37.5 mL
<u><em>37.5 mL of a 4.0 M Mg(OH)₂ are needed to make 750 mL of 0.2 M Mg(OH)₂</em></u>
The formula for Aluminum Chloride is <span>AlCl3, with one aluminum atom and three chloride atoms.</span>
Answer:
Star A is this many times (9000)^4 x [4 π R^2 σ] brighter than Star B = (3000)^4 x [4 π R^2 σ]
Explanation:
In accordance with the Stefan-Boltzmann Law,
L = 4 π R^2 σ Τ^4
(Where L = is the energy emitted out by star i.e., Brightness, R = Radius of the star, σ = 5.67 x 10^-8 Stefan-Boltzmann Constant and T is the temperature of the star)
Star A = (9000)^4 x [4 π R^2 σ]
Star B = (3000)^4 x [4 π R^2 σ]
<span>The fissionable substance that is
essential for a chain reaction in order to sustain itself shows that atomic
mass needs to be heavier for it to release more than one neutron. Because of
this reaction it is expected to release some energy.</span>
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