Study Guide Questions

Question 1

All elements and compounds are pure substances because…

Answer 1

They contain all the same molecule/thing

Question 2

Mixtures can never be pure substances because…

Answer 2

Do not contain all the same molecule/thing

Question 3

What’s the difference between a property of matter and a change in matter

Answer 3

Properties describe matter
Changes alter matter

Question 4

Sublimation of dry is is a _____ change because_________________

Answer 4

Physical change
Same substance Co2

Question 5

Making blueberry muffins is a ________ change

Answer 5

Chemical change
because color changes, gas real seat, endothermic, and solid is made

Question 6

Dying hair is a _____ change because ________

Answer 6

Physical
Same hair

Question 7

Burning a candle wick is a _______ because _______________________

Answer 7

Physical
Still a wick

Question 8

Sanding wood is a _____ change because ___________

Answer 8

Physical
Still wood

Question 9

cutting paper is a _______ change because ____________

Answer 9

Physical
Paper is still paper

Question 10

Digesting food is a ________ change because ________________

Answer 10

Chemical change
Gas is replaced, break down into new substances

Question 11

Milk going sour is a ______ change because _________

Answer 11

Chemical
Gas, and solid made

Question 12

Evaporating achohol is a _______ change because ___________

Answer 12

Physical
Same substance, achohol

Question 13

What are the signs of a chemical change

Answer 13

-change in color
-change in temp
-production of gas
-production of solid