Chemistry and Weathering DCA Review 7 th Grade. 1. What do the letters H and Cl represent in the chemical formula HCl? a. Molecules b. Mixtures c. Elements.

Chemistry and Chemistry and Weathering DCA ReviewWeathering DCA Review

77thth Grade Grade

1.1. What do the letters H What do the letters H and Cl represent in the and Cl represent in the chemical formula chemical formula HCl?HCl?

a. Moleculesa. Molecules

b. Mixturesb. Mixtures

c. Elementsc. Elements

d. Compoundsd. Compounds

2. The picture to the right 2. The picture to the right depicts a molecule of depicts a molecule of nitrous oxide (Nnitrous oxide (N22O). O). What do the spherical What do the spherical shapes represent?shapes represent?

a.a. AtomsAtoms

b.b. CellsCells

c.c. Chemical bondsChemical bonds

d.d. Nucleus Nucleus

3.3. Using your periodic table, Using your periodic table, which of the following which of the following statements best describes statements best describes the element Fluorine?the element Fluorine?

a.a. Fluorine has an atomic Fluorine has an atomic number of 8.number of 8.

b.b. Fluorine is a metal.Fluorine is a metal.

c.c. Fluorine is a metalloid.Fluorine is a metalloid.

d.d. Fluorine is a non metal Fluorine is a non metal with a an atomic number with a an atomic number of 9.of 9.

4.4. Which of the following Which of the following best depicts a compound?best depicts a compound?

a.a.

b.b.

c.c.

d.d.

5.5. The chemical formula The chemical formula for Copper Sulfate is for Copper Sulfate is CuSOCuSO44. How many . How many different elements make different elements make up Copper Sulfate?up Copper Sulfate?

a.a. 22

b.b. 33

c.c. 55

d.d. 44

6.6. Students are investigating the Students are investigating the properties of gases released properties of gases released during a chemical reaction during a chemical reaction experiment using a match to experiment using a match to detect flammability of gases. detect flammability of gases. When the match is struck and When the match is struck and placed over the experiment, it placed over the experiment, it flares up into a large flame. flares up into a large flame. Students can conclude that the Students can conclude that the chemical reaction releases chemical reaction releases which of the following which of the following gases…..gases…..

a.a. Carbon monoxideCarbon monoxideb.b. OxygenOxygenc.c. Carbon dioxideCarbon dioxided.d. HeliumHelium

7.7. Abrasion causes Abrasion causes mechanical mechanical weathering of rock weathering of rock by….by….

a.a. Grinding action of Grinding action of rock particles rock particles

b.b. Plant growthPlant growth

c.c. Freezing and thawingFreezing and thawing

d.d. Release of pressureRelease of pressure

8.8. Frost (ice) wedging Frost (ice) wedging causes mechanical causes mechanical weathering of rock byweathering of rock by

a.a. Grinding action of Grinding action of rock particles rock particles

b.b. Plant growthPlant growth

c.c. Freezing and thawingFreezing and thawing

d.d. Release of pressureRelease of pressure

9.9. Animal activity and Animal activity and root pry are examples root pry are examples of of

a.a. Chemical weatheringChemical weathering

b.b. Mechanical roboticsMechanical robotics

c.c. Chemical warfareChemical warfare

d.d. Mechanical Mechanical weathering weathering

10.10. What type of What type of weathering causes the weathering causes the molecular make-up of molecular make-up of rock to change?rock to change?

a.a. MechanicalMechanical

b.b. OperationalOperational

c.c. SchematicSchematic

d.d. chemical chemical

11.11. What statement best What statement best describes why frost (ice) describes why frost (ice) wedging is a form of wedging is a form of weathering?weathering?

a.a. Water is a strong soluteWater is a strong solute

b.b. Cold water dissolves Cold water dissolves substance fastsubstance fast

c.c. Water expands when it Water expands when it freezesfreezes

d.d. The mass of water The mass of water increases when it freezesincreases when it freezes

12.12. Which of the following Which of the following best describes a permeable best describes a permeable rock?rock?

a.a. Made of small sedimentsMade of small sediments

b.b. Full of tiny, connected air Full of tiny, connected air spacesspaces

c.c. Made of only one elementMade of only one element

d.d. Made of many elementsMade of many elements

13.13. Which of the Which of the following is the best following is the best way to handle way to handle chemicals in the labchemicals in the lab

a.a. Dump them in sinkDump them in sinkb.b. Put chemicals back in Put chemicals back in

original containersoriginal containersc.c. When testing odor, use When testing odor, use

the waft methodthe waft methodd.d. Taste the samplesTaste the samples

14.14. Why does the cement Why does the cement turtle have a water turtle have a water tight sealant on it:tight sealant on it:

a.a. So it does not rustSo it does not rust

b.b. So it does not crawl So it does not crawl awayaway

c.c. So it resists ice So it resists ice wedgingwedging

d.d. So it is hiddenSo it is hidden

15.15. Acid rain would cause:Acid rain would cause:

a.a. Rapid chemical Rapid chemical weatheringweathering

b.b. Rapid mechanical Rapid mechanical weatheringweathering

c.c. Rapid abrasionRapid abrasion

d.d. Rapid root pryRapid root pry

16.16. Lichens produce a Lichens produce a weak acid that helps weak acid that helps ______ weathering.______ weathering.

a.a. ChemicalChemical

b.b. MechanicalMechanical

c.c. PhysicalPhysical

d.d. CatastrophicCatastrophic

17.17. If the following rock is thrown If the following rock is thrown into a stream and is carried into a stream and is carried several hundred miles several hundred miles downstream, which of the downstream, which of the following best illustrates the following best illustrates the appearance of the rock?appearance of the rock?

18.18. In a tropical rainforest, In a tropical rainforest, weathering would take weathering would take place _________.place _________.

a.a. More slowly than a dry More slowly than a dry and cool climateand cool climate

b.b. Same as anywhere elseSame as anywhere elsec.c. Faster than a dry and Faster than a dry and

cool climatecool climated.d. At the same rate as a At the same rate as a

dry and cool climatedry and cool climate

19.19. Which of the following Which of the following would be the best example would be the best example of weathering?of weathering?

a.a. The movement of The movement of sediments downstreamsediments downstream

b.b. The laying of new The laying of new sediments to form a sediments to form a sandbarsandbar

c.c. Rain clouds formingRain clouds forming

d.d. Tree roots growing Tree roots growing through cracks in a rockthrough cracks in a rock

20.20. Which of the Which of the following is a cause of following is a cause of mechanical mechanical weathering?weathering?

a.a. OxidationOxidation

b.b. Acid rainAcid rain

c.c. Chemical reactionChemical reaction

d.d. abrasionabrasion

21.21. Which of the following is Which of the following is not an example of not an example of chemical weathering?chemical weathering?

a.a. Plant roots prying rock Plant roots prying rock apartapart

b.b. Acid rain dissolving stoneAcid rain dissolving stone

c.c. Lichens growing on rockLichens growing on rock

d.d. None of the aboveNone of the above

22.22. Acid rain is caused by:Acid rain is caused by:

a.a. Broken cloudsBroken clouds

b.b. LichensLichens

c.c. DogsDogs

d.d. pollutionpollution

23.23. Climate and type of rock Climate and type of rock are:are:

a.a. Negligible concerns when Negligible concerns when considering weatheringconsidering weathering

b.b. Slightly important when Slightly important when considering weatheringconsidering weathering

c.c. Most important when Most important when considering weatheringconsidering weathering

d.d. Sometimes matter when Sometimes matter when considering weatheringconsidering weathering

24.24. Which of the Which of the following is an agent following is an agent of chemical erosion?of chemical erosion?

a.a. Release of pressureRelease of pressure

b.b. GravityGravity

c.c. WindWind

d.d. waterwater

25.25. Which of the following Which of the following statements is true based on statements is true based on the class notes?the class notes?

a.a. Molecules are made of 2 Molecules are made of 2 or more elementsor more elements

b.b. Compounds are made of 1 Compounds are made of 1 atomatom

c.c. Mixtures contain the same Mixtures contain the same type of elementstype of elements

d.d. Compounds contain two or Compounds contain two or more elementsmore elements

1.1. CC2.2. AA3.3. DD4.4. CC5.5. BB6.6. BB7.7. AA8.8. CC9.9. DD10.10. DD11.11. CC12.12. BB

13.13. CC14.14. CC15.15. AA16.16. AA17.17. AA18.18. CC19.19. DD20.20. DD21.21. AA22.22. DD23.23. CC24.24. DD25.25. DD