Actually elements aren’t called building blocks but it’s the atom. They are called that because you need two or more to form a molecule. So they are kind of like legos.
Answer : The correct option is "record 10.00 ml in the notebook after using it."
Explanation :
If an instrument has "10 mL TD" written on it, that means the instrument is meant To Deliver (TD) 10 mL of volume.
Therefore the option that has 5.00 mL is not correct.
"+/- 0.01 mL" indicates the precision of the instrument. We know that no measurement is 100% accurate and there is always some uncertainty associated with any measurement.
Here, 0.01 indicates the uncertainty in the measurement.
When we have 0.01 mL , that means the instrument can record precisely to the hundredths place.
The more the significant figures, the greater is the accuracy of the measurement.
Therefore when we use an instrument that has "+/- 0.01 mL" written on it, we should record the reading as 10.00 mL
The accurate answer is
<span>Milk
</span>A mixture is a chemical bond that is formed by two elements or more
Glad to help :))
Answer:
B. II.
Explanation:
The idea of recrystallization works when the solubility of the target substance decreases as the temperature of the solution decreases.
The method of recrystallization involves dissolving the solute in a suitable hot solvent and then allow the solution to cool gradually. The pure solute dissolves in the hot solvent and then separates out of the solution as it is cooled to room temperature.
Hence recrystallization is preferred over solvent extraction when the desired compound is poorly soluble in the solvent pair at low temperatures and greatly soluble in the solvent pair at high temperatures.
Concentration of hydrogen ions remaining in the final solution is 
In original solution we have 1.450M of HCl
1.450 M means 1.450 moles of HCl in 1 liter of water
Therefore, number of moles of HCl in 500ml of water will be
=
moles
= 0.725 moles of HCl
Reaction between HCl and Zn happens when zinc is added -
→ 
Therefore two moles of HCl is needed for 1 mole of zinc
Thus number of moles of HCl needed to react with 12.7g of Zinc will be
= 
= .388 Moles
So moles of HCl left =
= 0.3365 moles
In 1 Mole of HCl there is 1 mole of H because
→ 
Therefore in 0.3365 mole HCl there will be 0.3365 moles of H
Thus final concentration of H ions in final solution is =
= 
= 0.673M
To know more about concentration in solution
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