The tongue depressor will float on water because its density is less than that of water.
<h3>When do substances sink or float in a liquid?</h3>
Substance will either float or sink in a liquid depending on the comparative densities of the substance and the liquid.
A substance will float in a liquid if it is less dense than the liquid.
A substance will sink in a liquid if it is denser than the liquid.
The density of the tongue depressor = 4.54/6.78 = 0.67 g/cm³
The density of water is 1 g/cm³.
Therefore, the tongue depressor will float on water.
In conclusion, the density of substances determines whether thy float or sink in water.
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False reading may be obtained if there is a run over from adjacent reagent area in excessively wetted strips
Phenolphthalein only works efficiently from 4 to 10 ph
Litmus and phenolphthalein and methyl orange indicators can only allow you to tell if solution is alkaline,neutral or acidic
The two indicators with less limitations are methyl orange and thymol blue
Answer:
We need 6.0 moles of aluminium
Explanation:
Step 1: Data given
Number of moles of H2 = 9.0 moles
Step 2: The balanced equation
2 Al + 6 HCl → 2 AlCl3 + 3H2
Step 3: Calculate moles Al
For 2 moles Aluminium, we need 6 moles HCl to produce 2 moles AlCl3 and 3 moles H2
For 9.0 moles of H2 we need 2/3 * 9.0 = 6.0 moles of aluminium
We need 6.0 moles of aluminium
Answer:
As a substance changes from a solid to a liquid to a gas, its molecules first the molecules are moving fast enough, they are able to "escape." They leave the surface of the liquid as gas molecules. Evaporation is not the only process that can change a substance from a liquid to a gas. The same change can occur through boiling.
Explanation:
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