Answer:
True
Explanation:
This is true because technology advances all the time and even Newton's "Laws" could be disproved in the future.
• Gather facts and define key points and goals.
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The
correct answer is A. In the combined gas law, if the volume is decreased and
the pressure is constant, then the temperature decreases.
<span>P1V1/
T1 = P2V2 / T2</span>
<span>Assume
the volume decrease by half; V2 = V1/2</span>
<span>P1V1/
T1 = P2V1 /2 T2</span>
<span>Cancelling
terms,</span>
<span>1/T1
= 1/2 T2</span>
T2
= T1/2
<span>Thus,
the temperature decreased.</span>
<h2>
Answer:B</h2>
Explanation:
A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase.A solution has two components.The minor component solute is dissolved in a major component called solvent.
Any option that claims against this definition is wrong.
option A:
Since the solution is homogeneous,it has same properties throughout.
option B:
Solutions contain solute dissolved in solvent not solvent dissolved in solute.
option C:
The solution can be in any phase.
option D:
Solutions are a kind of mixtures because they have no chemical interactions among the solute and solvent particles.
So,option B is wrong.
Answer:
The temperature of the reaction mixture increases.
Explanation:
One very good indicator that a chemical reaction has taken place is that there is a temperature change about the reaction.
Either an emission of heat involving the reaction milieu becoming hotter or an absorption of heat making the environment colder.
- Enthalpy changes of reactions are good parameters to measure whether or not a reaction has taken place.
- There is no color change, and mass is always conserved for most reaction, so we cannot use these tools for assessing whether a reaction has occurred or not.
