a student was given two clear liquids; a colorless liquid and a dark-blue liquid. the student was asked to combine the liquids in a beaker and record observations. which of the following results, if true, would provide the best evidence that a chemical change took place when the liquids were combined?

Answers

Answer 1

The result providing the best evidence about the fact that a chemical change took place when the two mixtures were mixed is A: the resulting mixture was cloudy.

A cloudy mixture is often a sign of a chemical change taking place, as it indicates that the substances in the mixture have reacted to form new substances. A color change alone (i.e. dark blue to colorless) is not necessarily a definitive sign of a chemical change, as it could be due to a physical change such as a dilution of the colored liquid. However, a cloudy mixture is a strong indication of a chemical reaction, as the substances have combined to form new particles.

Complete question

a student was given two clear liquids; a colorless liquid and a dark-blue liquid. the student was asked to combine the liquids in a beaker and record observations. which of the following results, if true, would provide the best evidence that a chemical change took place when the liquids were combined?

1The resulting mixture was cloudy.

2The total volume of the mixture was equal to the sum of the initial volumes.

3The resulting liquid was light blue.

4The liquids formed two separate layers in the beaker.

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Related Questions

A 25.0 mL sample of H2SO4 requires 20.0 mL of 2.00 M KOH for complete neutralization. What is the molarity of the acid?

Answers

We must first figure out how many moles of acid the KOH neutralised before we can calculate the molarity of the acid. Using the balanced equation for the neutralisation reaction, we may accomplish this:

K2SO4 + 2H2O = H2SO4 2KOH

According to this equation, complete neutralisation requires two moles of KOH for every mole of H2SO4. We can use the following equation to get the quantity of H2SO4:

(volume H2SO4 x molarity H2SO4 / 1000) = moles H2SO4

We are aware of the H2SO4 volume (25.0 mL), the KOH volume (20.0 mL) required for neutralisation, and the molarity of the KOH (2.00 M). Rearranging the equation above will allow us to get the molarity of the H2SO4.we can rearrange the equation above and substitute in the known values:

molarity H2SO4 = (1000 x moles H2SO4) / volume H2SO4

molarity H2SO4 = (1000 x (20.0 mL x 2.00 M) / (2 x 25.0 mL))

molarity H2SO4 = 8.00 M

So, the molarity of the H2SO4 is 8.00 M.

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The following questions pertain to the element located in period 4 and group 15 of the periodic table.

What is the name of this element?
What is the atomic symbol for this element?
Is this element a metal, a nonmetal, or a metalloid?
What is the atomic number of this element?
How many protons does a neutral atom of this element have?
How many electrons does a neutral atom of this element have?
What is the average number of neutrons in a neutral atom of this element?
How many valence electrons does a neutral atom of this element have?
Assuming the atom is at ground state, or its lowest energy level, how many energy levels exist in its electron cloud?
Is the ion of this element larger or smaller than its neutral atom?
What is the charge on the monatomic ion of this element?
How many protons are in a monatomic ion of this element?
How many total electrons are in a monatomic ion of this element?
How many valence electrons are in a monatomic ion of this element?

Answers

Answer:

The name of this element is Nitrogen.

The atomic symbol for this element is N.

Nitrogen is a nonmetal.

The atomic number of Nitrogen is 7.

A neutral atom of Nitrogen has 7 protons.

A neutral atom of Nitrogen has 7 electrons.

The average number of neutrons in a neutral atom of Nitrogen is 7.

A neutral atom of Nitrogen has 5 valence electrons.

Assuming the atom is at ground state, or its lowest energy level, it has 2 energy levels in its electron cloud.

A Nitrogen ion is the same size as a neutral Nitrogen atom.

The charge on the monatomic ion of Nitrogen is +3.

There are 7 protons in a monatomic ion of Nitrogen.

There are 10 total electrons in a monatomic ion of Nitrogen.

There are 7 valence electrons in a monatomic ion of Nitrogen.

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