12. chemical properties refer to how a substance interacts or undergoes changes with other substances through chemical reactions. these properties help us understand the behavior of materials when they combine into new substances. examples of c______ changes: burning wood, baking bread in the oven, food digestion, souring milk, photosynthesis, boiling an egg 13. physical properties are characteristics that we can observe without changing the substance into something else. these properties give us information about how a substance behaves – color, texture, density, mass, volume, hardness, melting/boiling/freezing point, and conductivity. examples of p________ changes: liquid changing to a gas, boiling water, freezing water, tearing paper, breaking glass, chopping vegetables 14. define conductivity and given an example of conductivity conductivity - _________________________ ____________________________________ example - ___________________________ 15. the ph scale ranges from ______ - ______ and it shows whether a solution is an a______, b______, or n______l. *acids range from ______ on the ph scale *a ph of ____ is neutral (neither acid or base) *bases (alkaline) range from ______ on the ph scale (chart: 0 - 14 ph scale with acidic, neutral, alkaline labels) 16. what is an example of an acid? ______________ ph ______ what is an example of a base? ______________ ph ______ what is an example of a neutral? ______________ ph ______ 17. you wanted to earn some major aura points by helping clean up mrs. ross’ classroom after the acids and bases lab. as you were cleaning you came across an unmarked beaker with a clear odorless solution in it. you remember that you should ______ acidic solutions by bringing the ph to ______ before disposing of them. how would you change the ph of the mystery substance so it could be safely disposed of? ______

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Accepted Answer

### Question 12
# Brief Explanations:
The sentence is about chemical changes (reactions forming new substances). The prefix "c" should be for "chemical". Examples like burning wood (combustion, new substances) fit chemical changes.
# Answer:
chemical

### Question 13
# Brief Explanations:
The topic is physical properties (no new substance). The prefix "p" is for "physical". Examples like boiling water (state change, no new substance) are physical changes.
# Answer:
physical

### Question 14
# Brief Explanations:
Conductivity is a material's ability to conduct electricity/heat. Example: Metals (like copper wire) conduct electricity well, or water (with ions) conducts.
# Answer:
Conductivity - The ability of a substance to conduct electricity or heat.
Example - A copper wire conducting electricity (or salt water conducting electricity, or metal pan conducting heat).

### Question 15
# Brief Explanations:
The pH scale ranges 0–14. 0–6.9 is acidic (a), 7 is neutral (n), 7.1–14 is basic (b). Acids: 0–6.9, neutral pH 7, bases: 7.1–14.
# Answer:
The pH Scale ranges from 0 - 14 and it shows whether a solution is an acid, base, or neutral.
*Acids range from 0 - 6.9 on the pH scale
*A pH of 7 is Neutral (neither acid or base)
*Bases (Alkaline) range from 7.1 - 14 on the pH scale

### Question 16
# Brief Explanations:
Acid example: Vinegar (acetic acid), pH ~3. Base: Baking soda (sodium bicarbonate), pH ~9. Neutral: Pure water, pH 7.
# Answer:
What is an example of an acid? Vinegar (pH ~3)
What is an example of a base? Baking soda (pH ~9)
What is an example of a neutral? Pure water (pH 7)

### Question 17
# Brief Explanations:
To neutralize acidic solutions, add a base (like baking soda) to raise pH to 7 (neutral). So first blank: neutralize, pH 7, method: add a basic substance (e.g., baking soda) to neutralize.
# Answer:
You should neutralize acidic solutions by bringing the pH to 7 before disposing. To change the pH, add a basic substance (like sodium bicarbonate/baking soda) to neutralize the acid until pH is 7.

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