Question

content mastery
matter
directions: complete the paragraphs using the terms listed. some terms may be used more than once.
liquid
physical change
chemical change
mixture
physical properties
physical property
distillation
equals
melting
conservation of mass

scientists try to explain how changes in substances take place. by applying energy,
you can tear a sheet of paper into pieces and cause a 1. __________
__________ in the paper. on a hot summer day, water vapor will
condense into water droplets on the outside of a glass of iced tea. the glass of iced
tea is a 2. __________ of sugar, tea, lemon, and water. water is a clear,
colorless 3. __________ at room temperature. the words clear and
colorless describe two 4. ________ ________
of water. the melting of the ice in iced tea is a 5. __________
__________.

in comparison, a 6. ________ ________
produces new substances. when a candle burns, physical and chemical changes take
place. the 7. __________ of the wax is a physical change. the wick, as
it burns, combines with gaseous oxygen in air. after the chemical change, water
vapor and carbon dioxide gas are formed. the mass of all substances before
a chemical change 8. __________ the mass of all substances after a
chemical change. this is called the law of 9. __________
________ ________.

to separate a solid from a liquid, such as salt from seawater, a process using
the 10. ________ ________ of boiling point called

1. __________ is used.

Explanation:

1. Tearing paper is a physical change (no new substance).
2. Iced tea has multiple components, so it's a mixture.
3. Water at room temp is a liquid.
4. Clear/colorless are physical properties (plural as two properties).
5. Melting ice is a physical change (state change, no new substance).
6. Chemical change produces new substances.
7. Wax melting (state change) is melting.
8. Mass before = mass after (conservation of mass), so "equals".
9. Law of conservation of mass.
10. Distillation uses difference in boiling points.
11. Process is distillation.

Answer:

1. physical change
2. mixture
3. liquid
4. physical properties
5. physical change
6. chemical change
7. melting
8. equals
9. conservation of mass
10. difference (in)
11. distillation

(Note: For blank 10, the phrase should be "difference of boiling point" or "difference in boiling point" depending on context, but based on the terms given, "difference" fits as part of the phrase "using the difference of boiling point" leading to distillation. The original problem's blank 10 and 11 are likely "difference" and "distillation" with the structure "using the [difference] of boiling point called [distillation]".)