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AleksandrR [38]
3 years ago
6

True or false - Evaporating, condensing, melting and freezing are all examples of chemical change.

Chemistry
2 answers:
Fittoniya [83]3 years ago
3 0
False because they can turn back to their original form a chemical change would be like burning paper it can’t be changed back to it’s original offer it’s burnt
S_A_V [24]3 years ago
3 0

Answer:

false

Explanation:

Because these examples are able to turn back into their original form. For example, melted ice can refreeze.

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When you breath in, oxygen passes through the walls of the ______________(tiny sac-like structures) and into the blood.
kifflom [539]

Answer:

alveoli

Explanation:

6 0
3 years ago
draw the lewis structure for co with an arrow representing the dipole moment. refer to figure 10.10 to estimate the percent ioni
Alona [7]
Problem 57EDraw the Lewis structure for CO with an arrow representing the dipole moment. UseFigure 9.10 to estimate the percent ionic character of the CO bond. Step by step solutionStep 1 of 2Lewis structure of CO:Carbon has four valence electrons and oxygen has six valence electrons. If only one bond wereto be formed between carbon and oxygen atoms, carbon would have five electrons and oxygenwould have seven electrons.The single bond between these two atoms is not sufficient to lead to an octet on each atom . Tocomplete the octet of each atom in CO, we must employ a triple bond .A triple bond is formed bythe six electrons sharing between these two atoms and it is shown as follows.\nThe Lewis structure of CO with an arrow representing the dipole moment.The arrow towards anoxygen atom it represents is a highly electronegative atom.
5 0
3 years ago
How would you determine the proper number of significant figures for measurement of a
schepotkina [342]

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5 0
3 years ago
Which action is the best example of a direct observation
luda_lava [24]

Since you didn't have any extra information about the question I'll be presenting an example from my own textbooks that I've used.

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3 0
3 years ago
Read 2 more answers
What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?
AfilCa [17]
ANSWER - 48.83%

Mg - 24.31
S - 32.07
O - 16x4 - 64
ADD ALL TOGETHER = 120.38

H - 1.01x2 - 2.02
O - 16
TOTAL = 18.02x7 = 126.14

ADD 120.38 to 126.14 = 246.52
last part divide MgSO4 by total compound mass 
120.38/246.52 then multiply by 100 = 48.831
7 0
3 years ago
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