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3 years ago

Express the following in standard exponential format 3,186

Chemistry

1 answer:

Colt1911 [192]3 years ago

3 0

3.19 x 10³

Explanation:

The exponential format of the a figure is used to simplify the expression of big numbers to make them easier to work with.

The number is simply raised to the power of tens.

3,186

This is number three thousand one hundred and eighty six

The highest number here is a thousand

A thousand is 10³

So we simply take the rest of the values and express it this way;

3.186 x 10³ or 3.19 x 10³ on rounding up

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A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 80.0 mL

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Answer:

111.44 g

Explanation:

We'll begin by calculating the volume of the solvent. This can be obtained as follow:

Mass of solvent = 21 g

Density of solvent = 0.865 g/mL.

Volume of solvent =?

Density = mass /volume

0.865 = 21 /volume of solvent

Cross multiply

0.865 × volume of solvent = 21

Divide both side by 0.865

Volume of solvent = 21 / 0.865

Volume of solvent = 24.28 mL

Next, we shall determine the volume of the solid. This can be obtained as follow:

Volume of solvent + solid = 80.0 mL.

Volume of solvent = 24.28 mL

Volume of solid =?

Volume of solid = (Volume of solvent + solid) – (Volume of solvent)

Volume of solid = 80 – 24.28

Volume of solid = 55.72 mL

Finally, we shall determine the mass of the solid. This can be obtained as follow:

Density of solid = 2.00 g/mL.

Volume of solid = 55.72 mL

Mass of solid =.?

Density = mass / volume

2 = mass of solid / 55.72

Cross multiply

Mass of solid = 2 × 55.72

Mass of solid = 111.44 g

Therefore, the mass of the solid is 111.44 g

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The best way to separate sesame seeds from salt solution is _____

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Answer:

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What can be formed by atoms of same element (H) or atoms of different 20 points<br> elements (CO)? *

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Answer:

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onsider the reaction, NO2(g) + CO(g) → NO(g) + CO2(g), for which the rate law has been determined to be: Rate = k[NO2]2[CO]. Whi

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The correct answer is option D.

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Rate of the reaction:

$R=-\frac{1}{1}\times \frac{d[NO_2]}{dt}=-\frac{1}{1}\times \frac{d[CO]}{dt}$

Rate of decrease in nitrogen dioxide concentration is equal to the rate of decrease in carbon monoxide.

Given rate expression of the reaction:

$R = k[NO2]^2[CO]$

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Is it multiple choice or direct?

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