Answer:
If a saturated hot solution is allowed to cool, the solute is no longer soluble in the solvent and forms crystals of pure compound. Impurities are excluded from the growing crystals and the pure solid crystals can be separated from the dissolved impurities by filtration.
Answer:
They are both halogens and have the same number of electrons on their outer shell.
Any element with 7 electrons in the outermost shell will have similar properties. Thus other elements in the same column of the periodic table as chlorine will have similar properties.
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The answer is (3) hydrogen ions as the only positive ions in solution. One ionic compound must have positive ion and negative ion at the same time. The Arrhenius base has hydroxyl ion as only negative ions in solution.
<h3>
Answer:</h3>
300 kPa
<h3>
Explanation:</h3>
Concept tested: Gas Laws (Combined gas law)
Initial pressure, P₁ = 100 kPa
Initial temperature,T₁ = 27°C
But, K = °C + 273, therefore, T₁ = 300 K
Initial volume, V₁ = 900 L
New temperature, T₂ = -73°C
= -73°C + 273
= 200 K
New volume, V₂ = 200 L
We are required to calculate the new pressure, P₂
- To find the new pressure of the gas, we are going to use the combined gas law;
- Combined gas law combines both Charles's law and Boyle's law.
- According to the combined gas law;
P₁V₁/T₁ = P₂V₂/T₂
- To calculate the new Pressure, P₂, we rearranging the formula;
P₂ =(P₁V₁T₂) ÷ (V₂T₁)
Therefore;
P₂ = (100 kPa × 900 L × 200 K) ÷ (200 L × 300 K)
= 300 kPa
Therefore, a pressure of 300 kPa must be applied.
Answer:
the correct way to do this would be
Explanation:
2 C3H7OH + 9 O2 -> 6 CO2 + 8 H2O
6 C -> 6 C
now heres where it got tricky becasue theres two H's
H 7 * 2 + 7 H = 21 H -> 21 H
20 O -> 20 O
