Answer:
Add, reduce
Explanation:
Concentration is essentially a ratio of the amount of solute to the amount of solvent.
\text{Concentration} = \dfrac{\text{amount of solute}}{\text{amount of solvent}}
If you want to make a solution more dilute (less concentrated), you must do one of two things:
- Increase the denominator — add solvent
- Reduce the denominator — reduce the amount of solute
A is wrong. If you add both more solute and more solvent, the concentration will stay about the same.
B is wrong. If you add more solute and reduce the amount of solvent, the concentration will increase.
D is wrong. If you add more solute and do nothing to the amount of solvent, the concentration will increase.
Answer:
Explanation:
Given that,
The volume of a sample of gas measured at 27 °C is 10.0 dm.
We need to find the temperature when the volume is reduced to 9.0 dm at the same pressure.
According Charles law,
Where, T₂ is new temperature
So, the new temperature is .
Answer:
The correct option is: B) H₂0 and OH⁻ as a conjugate pair
Explanation:
According to Brønsted-Lowry theory, the<u> </u><u>acids</u><u> are the chemical substances that form a conjugate base by donating a proton</u> and <u>bases</u><u> are the chemical substances that form conjugate acid by accepting a proton.</u>
In the given chemical reaction: PO₄³⁻(aq) + H₂O(l) ⇄ HPO₄²⁻(aq) + OH⁻(aq)
<u>According to Brønsted-Lowry theory, PO₄³⁻ and OH⁻ are bases. Whereas, H₂O and HPO₄²⁻ are acids.</u>
<u>Also, PO₄³⁻ and HPO₄²⁻ are the conjugate acid-base pair; and H₂O and OH⁻ are the conjugate acid-base pair.</u>
Answer:
Helium is lighter than Hydrogen and Helium is a much safer gas.
Answer:
Electric and heat
Explanation:
Forms of solar energy include electricity and heat