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3 years ago

Using 3 – 4 sentences explain (in your own words) why water expands when it freezes?

2 answers:

wel3 years ago

8 0

Water has this unusual behavior when cooled at 4 degrees Celsius; it expands slightly until it reaches the freezing point and continue to expand by approximately 9%. This characteristic has something to do with the structure of the water molecule where there is a strong tendency to form a network of hydrogen bonds and each hydrogen atom is in a line between two oxygen atoms. These bonds force the crystalline structure to be very open into hexagonal form and expand dramatically.

SVEN [57.7K]3 years ago

8 0

Answer:

In the case of water, that is, when the liquid water gets cooled, it gets contract to a temperature of about 4 degrees is attained. However, after that, it starts to expand somewhat till it moves towards the freezing point, and eventually when it freezes, it expands by about 9 percent.

This characteristic has its source in the composition of the water molecule. In water, there possesses a capacity to produce a network of hydrogen bonds, where each atom of hydrogen is in a line amongst the two atoms of oxygen. This tendency of hydrogen bonding gets robust as the temperature lowers down. The formed ice structure is completely hydrogen-bonded and these bonds permit the structure to get open, thus, expansion takes place.

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Matthew has been collecting quarters in a jar. He has 176 quarters. What is the value of the coins in his jar?

AURORKA [14]

Answer:

The correct answer is : 44 dollars.

Explanation:

A quarter is one fourth of a dollar that is the reason it is known as quarter. A quarter is 25 cents or 0.25 dollar in value. If Matthew has 176 quarters in his jar than the value of the total coins would be:

1 quarter = 0.25 dollar

1 quarter = 1/4 dollar.

4 quarter = 1 dollar

then, 176 / 4 = x dollar

= 44 dollar

Thus, The correct answer is : 44 dollars.

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3 years ago

What is the first step in determining whether a group of scientists had created false data in a study? taking the group to court

andriy [413]

Answer: The first step is testing their theory!

Explanation: Scientists will have to set up an experiment to scientifically prove their statement/hypothesis:)

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3 years ago

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3 years ago

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The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________V when

Elodia [21]

Answer: The cell potential of the above reaction is 0.52 V

Explanation:

The given chemical equation follows:

$Pb^{2+}(aq.)+Zn(s)\rightarrow Zn^{2+}(aq.)+Pb(s)$

Oxidation half reaction: $Zn(s)\rightarrow Zn^{2+}(aq.)+2e^-$

Reduction half reaction: $Pb^{2+}(aq.)+2e^-\rightarrow Pb(s)$

To calculate the EMF of the cell, we use the Nernst equation, which is:

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Zn^{2+}]}{[Pb^{2+}]}$

where,

$E_{cell}$ = electrode potential of the cell = ? V

$E^o_{cell}$ = standard electrode potential of the cell = 0.63 V

n = number of electrons exchanged = 2

$[Zn^{2+}]=1.0M$

$[Pb^{2+}]=2.0\times 10^{-4}M$

Putting values in above equation, we get:

$E_{cell}=0.63-\frac{0.059}{2}\times \log(\frac{1.0}{2.0\times 10^{-4}})\\\\E_{cell}=0.52V$

Hence, the cell potential of the above reaction is 0.52 V

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3 years ago

Which color in the rainbow has the longest wavelength? 1. orange 2. blue3. yellow4.green 5. red

rodikova [14]

In rainbow, the color that has the longest wavelength is red which means option 5 is the correct choice.

Dispersion is described to be the spreading of white mild into its complete spectrum of colors, in truth we also can say a complete spectrum of wavelengths. The white mild turns into from solar and includes seven colors. On one end of the spectrum is red with the longest wavelength. Blue or violet mild has the shortest wavelength. White mild is a aggregate of all hues withinside the color spectrum. The colors of the rainbow are: Red, orange, yellow, green, blue, indigo, violet.

Therefore, option 5 is the correct choice.

To learn more about rainbow check the link below:

brainly.com/question/12008276

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1 year ago