Does anyone know where i can find a practice cumulative chem test online?

1 answer:

Montano1993 [528]2 years ago

6 0

Exam board websites often have past papers from several previous years, if you know what exam board you are going to be using, try that, if not there may be content on the edexcel and AQA websites

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Determine the spec gravity of 500 mL alcohol if the density is 0.79g/ml

slava [35]

Answer:

S.G = 0.79.

Explanation:

Hello there!

In this case, according to the given information in the problem, it turns out possible for us to calculate the specific gravity of this alcohol by simply dividing its density, 0.79 g/mL by that of the water, 1 g/mL just as a reference for us to work with:

$S.G=\frac{\rho _{alc}}{\rho _w}$

Thus, we plug in the densities to obtain:

$S.G=\frac{0.79g/mL}{1g/mL}\\\\S.G=0.79$

Which is dimensionless as g/mL is cancelled out due to its presence on both top and bottom of the previous formula.

Regards!

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In an endothermic reaction would energy be considered a reactant or a product?

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In an endothermic reaction, the products have more stored chemical energy than the reactants. In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. The excess energy in the reactants is released to the surroundings

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If a solution conducts electricity, it it positive evidence that

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<span>If a solution conducts electricity, it it positive evidence that solute dissolved in solvent is electrolyte.</span>