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3 years ago

7. What color would a solution with pH 5.5 be when mixed with phenolphthalein indicator

1 answer:

5 0

The indicator remains colourless in a solution with a pH between 1-7. It turns a solution with a pH higher than 8 pink. So your given solution would not change in colour.

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Which two statements are true about a system?

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<h3><u>Answer;</u></h3>

B) a system is a group of objects analyzed as one unit

C) energy they moves across system boundaries is conserved

<h3><u>Explanation;</u></h3>

System is a group of objects analyzed as one unit .

An open system is a system that freely exchanges energy and matter with its surroundings.
A closed system is a system that exchanges only energy with its surroundings, not matter. An isolated system does not exchange energy or matter with its surroundings.

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Choose from Blood tests vs Breath tests to answer the following questions about Blood

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3 years ago

What kind of solid is crystalline boron

Ulleksa [173]

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3 years ago

The density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 via a combust

bearhunter [10]

<u>The answer is </u><u>9.94 ml.</u>

<h3>What is density?</h3>

Density is a word we use to describe how much space an object or substance takes up (its volume) in relation to the amount of matter in that object or substance (its mass).
Another way to put it is that density is the amount of mass per unit of volume. If an object is heavy and compact, it has a high density.

Given,

The density of ethanol, C2H5OH = 0.789 g/mL

$n (CO_{2} ) = \frac{m}{M} = \frac{15G}{44 g/mol} } = 0.341 mol;$

$n ( C_{2} H_{2} OH) = \frac{n (CO_{2}) }{2} = \frac{0.341}{2} = 0.1705 mol;$

$m (C_{2} H_{2} OH) = 0.1705 mol * 46 g/ mol$ = 7.843 g

$V (C_{2} H_{2} OH ) = \frac{7.843}{0.789} = 9.94 ml.$

Therefore, the answer is 9.94 ml

Learn more about density of ethanol,

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<u>The complete question is -</u>

If the density of ethanol, C2H5OH, is 0.789 g/mL. How many milliliters of ethanol are needed to produce 15.0 g of CO2 according to the following chemical equation?

C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)

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2 years ago