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3 years ago

Which of the following units is a derived unit? Second Meter Density Ampere

Chemistry

2 answers:

laiz [17]3 years ago

8 0

Density because you have to use volume and mass to get it. (Density=mass/volume)

professor190 [17]3 years ago

8 0

Answer : The correct option is, Density

Explanation :

S.I : It is known as the international System of Units. It is defined as a scientific method to express the magnitude of the several basics units.

There are seven basic units in the system from which the other units are derived.

The seven base unit are, meter for length, kilogram for mass, second for time, ampere for current, kelvin for temperature, mole for amount of substance and candela for intensity.

As per question, second, meter and ampere are the S.I units but the density is the derived unit.

Density : It is defined as the mass of a substance contained per unit volume.

The unit of mass is kilogram (kg) and the unit of volume is $m^3$ . So, the unit of density will be:

Formula used :

$Density=\frac{Mass}{Volume}=\frac{kg}{m^3}=kg/m^3$

The unit of density is, $kg/m^3$

Hence, the derived unit is density.

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How many grams of a 22.9% sugar solution contain 68.5 g of sugar?

777dan777 [17]

The grams of 22.9 % sugar solution that contain 68.5 g of sugar is 299.13 g of solution

<u><em>calculation</em></u>

22.9% means that there are 22.9 g of sugar in 100 g of solution.

what about 68.5 g of sugar

- <em>by cross multiplication</em>

=[(68.5 g sugar x 100 g solution) /22.9 g sugar] =299.13 g of solution

Nb; <em>g sugar cancel each other</em>

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2 years ago

Why is an alloy is often more useful than a pure metal

mrs_skeptik [129]

<h2>Answer:</h2>

A pure metal has specific properties. Sometimes we need that metal but with modified properties. So for the modification of properties we make alloys.

<h3>Explanation;</h3>

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This makes them more useful than the pure metals alone.
For example, alloys are often harder than the metal they contain.

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2 years ago

An element's atomic number is 112. How many electrons would an atom of this element have?

PIT_PIT [208]

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3 years ago

Will a precipitate of magnesium fluoride form when 300. mL of 1.1 × 10 –3 M MgCl 2 are added to 500. mL of 1.2 × 10 –3 M NaF? [K

Tju [1.3M]

Answer:

No precipitate is formed.

Explanation:

Hello,

In this case, given the dissociation reaction of magnesium fluoride:

$MgF_2(s)\rightleftharpoons Mg^{2+}+2F^-$

And the undergoing chemical reaction:

$MgCl_2+2NaF\rightarrow MgF_2+2NaCl$

We need to compute the yielded moles of magnesium fluoride, but first we need to identify the limiting reactant for which we compute the available moles of magnesium chloride:

$n_{MgCl_2}=0.3L*1.1x10^{-3}mol/L=3.3x10^{-4}molMgCl_2$