Ps ch 2-review a substance has a melting point of 0ºC and a boiling point of 100ºC. The substance is most likely-water



Download 49,14 Kb.
Date conversion12.05.2017
Size49,14 Kb.
PS Ch 2-review
____ 1. A substance has a melting point of 0ºC and a boiling point of 100ºC. The substance is most likely-water

____ 2. A material that is malleable and conducts electricity is most likely -metal


____ 3. A mixture that appears to contain only one substance is a(an) homogeneous mixture
____ 4. What is the symbol for aluminum? Al
____ 5. Filtration can be used to separate mixtures based on what? Particle size
____ 6. Flammability is a material’s ability to burn in the presence of –oxygen and heat
____ 7. What method can be used to separate parts of a liquid mixture when the entire mixture can pass through a filter? Distilla distillation

___ 8. What is a heterogeneous mixture? –a mxture that is not uniform throughout-ex salad

____ 9. When a physical change in a sample occurs, what changes?size,shape, texture,
____ 10. What is useful for making molds because it has a low melting point?wax
____ 11. What is a chemical change?a change in which bonds are changed and new substances are formed
____ 12. A mixture can be classified as a solution, suspension, or colloid based on the size of the particles
____ 13. What has the highest viscosity? Molasses, Karo syrup low viscosity? water
____ 14. A substance that has high reactivity means what? easily combines chemically with other substances

____ 15. What is a clue that a chemical change has occurred? Precipitate, gas production, color change, etc

____ 16. You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” The soy milk is most likely a suspension
____ 17. What is a pure substance? A substance made of only one type of atom or molecule
____ 18. What is a physical change?a change that does not create new substances
____ 19. What physical properties of nylon and leather make them good materials to use for shoelaces? durability and flexibility

____ 20. What is an indication that something happens when lemon juice is mixed with milk?a precipitate forms


____ 21. If a material contains three elements joined in a fixed proportion, it is a(an)compound

____ 22. The symbol for gold is Au


____ 23. What is a clue of a chemical change that involves a solid being formed?precipitate

____ 24. Which are some characteristics of a mixtures?


____ 25. Water is a compound because it has a distinct ration between H and O that includes a chemically combined

26. The symbols for elements have either _one ________ or ___two______________ letters.


27. The substances in a(an) ___homogeneous______ mixture are evenly distributed throughout the mixture.
28. An element has a fixed composition because it contains only one type of ___atom_____________.
29. _____Distillation___ is a process that could be used to separate dissolved particles from the liquid in a solution.
30. When a metal changes color because it has been heated, a(an) __physical__________ change occurred. When a metal changes color because it has reacted with another substance, a(an) ________chemical change occurred.
Essay 2 of 3
31. Explain why rust forms in steel tanks that hold seawater in ships. How can nitrogen be used to reduce rust in these tanks?

32. Suppose you want to separate the leaves, acorns, and twigs from a pile of soil. Filtration and distillation are two processes of separating mixtures. Explain which process you would use and why.


33. Explain how you could use a physical property to test the purity of a silver coin without damaging the coin.



PS Ch 2

Answer Section
MULTIPLE CHOICE
1. ANS: A PTS: 1 DIF: L1 OBJ: 2.2.2

STA: 1.1.9-11.A.b | 1.1.9-11.A


2. ANS: C PTS: 1 DIF: L2 OBJ: 2.2.2

STA: 1.1.9-11.A.b | 1.1.9-11.A


3. ANS: A PTS: 1 DIF: L1 OBJ: 2.1.5
4. ANS: B PTS: 1 DIF: L1 OBJ: 2.1.2

STA: 1.1.9-11.F.b | 1.1.9-11.A.c


5. ANS: D PTS: 1 DIF: L1 OBJ: 2.2.4
6. ANS: C PTS: 1 DIF: L1 OBJ: 2.3.1

STA: 1.1.9-11.A.b | 1.1.9-11.G.a | 1.1.9-11.G


7. ANS: B PTS: 1 DIF: L2 OBJ: 2.2.4
8. ANS: C PTS: 1 DIF: L2 OBJ: 2.1.5
9. ANS: D PTS: 1 DIF: L1 OBJ: 2.2.5

STA: 1.1.9-11.G.a | 1.1.9-11.G | 1.1.9-11.D


10. ANS: D PTS: 1 DIF: L2 OBJ: 2.2.3
11. ANS: D PTS: 1 DIF: L1 OBJ: 2.3.3

STA: 1.1.9-11.G.a | 1.1.9-11.G | 1.1.9-11.H


12. ANS: B PTS: 1 DIF: L1 OBJ: 2.1.6
13. ANS: A PTS: 1 DIF: L2 OBJ: 2.2.1

STA: 1.1.9-11.A.b


14. ANS: A PTS: 1 DIF: L2 OBJ: 2.3.1

STA: 1.1.9-11.A.b | 1.1.9-11.G.a | 1.1.9-11.G


15. ANS: D PTS: 1 DIF: L1 OBJ: 2.3.2

STA: 1.1.9-11.H | 1.1.9-11.G | 1.1.9-11.G.a


16. ANS: D PTS: 1 DIF: L2 OBJ: 2.1.6
17. ANS: A PTS: 1 DIF: L2 OBJ: 2.1.1

STA: 1.1.9-11.A.b | 1.1.9-11.A.c | 1.1.9-11.A


18. ANS: A PTS: 1 DIF: L2 OBJ: 2.2.5

STA: 1.1.9-11.G.a | 1.1.9-11.G | 1.1.9-11.D


19. ANS: B PTS: 1 DIF: L1 OBJ: 2.2.3
20. ANS: B PTS: 1 DIF: L2 OBJ: 2.3.2

STA: 1.1.9-11.H | 1.1.9-11.G | 1.1.9-11.G.a


21. ANS: D PTS: 1 DIF: L1 OBJ: 2.1.3

STA: 1.1.9-11.A.c


22. ANS: A PTS: 1 DIF: L2 OBJ: 2.1.2

STA: 1.1.9-11.F.b | 1.1.9-11.A.c


23. ANS: D PTS: 1 DIF: L2 OBJ: 2.3.3

STA: 1.1.9-11.G.a | 1.1.9-11.G | 1.1.9-11.H


24. ANS: A PTS: 1 DIF: L2 OBJ: 2.1.4

STA: 1.1.9-11.A.b | 1.1.9-11.B


25. ANS: D PTS: 1 DIF: L2 OBJ: 2.1.3

STA: 1.1.9-11.A.c


COMPLETION
26. ANS: one, two

PTS: 1 DIF: L2 OBJ: 2.1.2 STA: 1.1.9-11.F.b | 1.1.9-11.A.c


27. ANS: homogeneous

PTS: 1 DIF: L1 OBJ: 2.1.5


28. ANS: atom

PTS: 1 DIF: L1 OBJ: 2.1.2 STA: 1.1.9-11.F.b | 1.1.9-11.A.c


29. ANS: Distillation

PTS: 1 DIF: L1 OBJ: 2.2.4


30. ANS: physical, chemical

PTS: 1 DIF: L2 OBJ: 2.3.3

STA: 1.1.9-11.G.a | 1.1.9-11.G | 1.1.9-11.H
ESSAY
31. ANS:

Rust forms in the tanks because oxygen dissolved in the water reacts with iron in the steel. Nitrogen gas can be pumped into the tanks. The nitrogen displaces some of the dissolved oxygen. Because nitrogen is less reactive than oxygen, less rust forms.

PTS: 1 DIF: L2 OBJ: 2.3.1

STA: 1.1.9-11.A.b | 1.1.9-11.G.a | 1.1.9-11.G


32. ANS:

Filtration would be used because it is the process of separating mixtures based on the size of their particles (or pieces). A screen could be used to separate the mixture. The holes in the screen would need to be large enough to allow the soil to pass through but not the leaves, acorn, or twigs.

PTS: 1 DIF: L2 OBJ: 2.2.4
33. ANS:

Silver has a known density at room temperature (10.5 g/cm3). You can measure the density of the coin and compare it to the density of silver. If the densities of the coin and silver are the same, the coin is pure silver. If the densities of the coin and silver are different, the coin either does not contain silver or contains at least one other substance in addition to silver.



PTS: 1 DIF: L2 OBJ: 2.2.2 STA: 1.1.9-11.A.b | 1.1.9-11.A


The database is protected by copyright ©sckool.org 2016
send message

    Main page