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garri49 [273]
3 years ago
10

When placed in a freezer, liquid water turns into solid ice. Why is this considered a physical change? A. The physical structure

of the water molecules change as bonds are broken and atoms are rearranged.. B. Only the motion and arrangement of the particles changes, not the identity of the substance.. C. The water molecules react when exposed to the cold temperature, causing the atoms to separate.. D. Only the arrangement of the atoms within the molecules changes, not the distance between them
Chemistry
2 answers:
avanturin [10]3 years ago
6 0

<span>A physical change changes the bonds between molecules of the substance. so option a is right.</span>
oksian1 [2.3K]3 years ago
3 0
B. Only the motion and arrangement of the particles changes, not the identity of the substance
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In water, hydrogen bonds are best described as _____.
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Answer: Option D) covalent bonds between water molecules

In water, hydrogen bonds are best described as covalent bonds between water molecules

Explanation:

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Thus, the sharing of electrons between oxygen and hydrogen atoms is responsible for the covalent bonds between water molecules

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Balanced equation of magnesium metal and hydrochloric acid
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CdF2(s)⇄Cd2+(aq)+2F−(aq)A saturated aqueous solution of CdF2 is prepared. The equilibrium in the solution is represented above.
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Answer:

The correct answer is option a.

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3 years ago
Whic number of the periodic table is the atomic number and which number is the atomic mass?
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Answer:

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5 0
3 years ago
Fill in the missing data point. Show all calculations leading to an answer.
Aleksandr-060686 [28]

Answer:  

1090 mmHg  

Explanation:  

We know that with gases we must use a Kelvin temperatures, so let’s try a plot of pressure against the Kelvin temperature.  

We can create a table as follows  

<u>t/°C</u>  <u>T/K</u>  <u>p/mmHg</u>  

  10   283      726  

  20  293      750  

  40   313      800  

  70  343      880  

100  373       960  

150  423        ???  

I plotted the data and got the graph in the figure below.  

It appears that pressure is a linear function of the Kelvin temperature.  

y = mx + b  

where x is the slope and b is the y-intercept.

===============

<em>Calculate the slope  </em>

I will use the points (275, 700) and (380, 975).  

Slope = Δy/Δx = (y₂ - y₁)/(x₂ -x₁) = (975 -700)/(380 – 275) = 275/105 = 2.619  

So,  

y = 2.619x + b  

===============

<em>Calculate the intercept </em>

When x = 275, y = 700.  

700 = 2.619 × 275 + b  

700 = 720 + b     Subtract 720 from each side and transpose.  

b = -20  

So, the equation of the graph is  

y = 2.619x -20  

===============

<em>Calculate the pressure</em> at 423 K (150°C)  

y = 2.619 × 423 - 20  

y = 1110 - 20  

y = 1090

At 150 °C, the pressure 1090 mmHg.  

The point is approximately at the position of the black dot in the graph.  

7 0
3 years ago
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