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Which of the following describes a physical change? A. Formation of a new substance caused by combining substances B. Water changing from liquid to gas through evaporation or boiling C. Formation of a new substance caused by application of heat
The following describes a physical change: Water changing from liquid to gas through evaporation or boiling.
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Asked 4/25/2014 11:55:35 AM
Updated 4/23/2016 5:04:28 PM
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The following describes a physical change:
Water changing from liquid to gas through evaporation or boiling.
Added 4/23/2016 5:04:28 PM
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Which is an indication that a chemical change to a substance has occurred?
Question
Updated 12/26/2017 1:02:02 AM
1 Answer/Comment
New substances are formed and energy is used or given off are both indications that a chemical change to a substance has occurred.
Added 12/26/2017 1:02:02 AM
This answer has been confirmed as correct and helpful.
Confirmed by Masamune [12/26/2017 1:06:43 PM]
What is the solution of the equation x 8 = 17? A. -9 B. 9 C. 25 D. 27
Question
Updated 5/1/2014 5:01:18 PM
1 Answer/Comment
If the symbol between x and 8 is positive, then:
x + 8 = 17;
x = 17 - 8;
x = 9

***************
If the symbol between x and 8 is negative, then:
x - 8 = 17;
x = 17 + 8;
x = 25
Added 5/1/2014 5:01:18 PM
This answer has been confirmed as correct and helpful.
What is 1/3x 5 = 12? -3x = 4 - 5; -3x = -1; x = 1/3
Weegy: 1/3x+5=12 subtract 5 from each side so you get 1/3x=7; now multiply by 3/1 to each side (3/1)(1/3x)=7(3/1) x=21 A=2r+8 subtract 8 from each side so you get a-8=2r; now divide by 2 to isolate r so you get a/2-4=r. [ ] (More)
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Expert Answered
Updated 5/3/2014 5:06:47 PM
1 Answer/Comment
1/3x+5=12;

x/3 + 5 = 12;

x/3 = 12 - 5;

x/3 = 7;

x = 7 * 3;

x = 21
Added 5/3/2014 5:06:47 PM
This answer has been confirmed as correct and helpful.
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