6 th and 7 th Grade TEKS

1. STAAR Review 6th and 7th Grade TEKS

2. Elements vs Compounds Element- a pure substance consisting of only one type of atom. Compound- a substance consisting of more than one type of atom or element.

5. CO2 How many different elements are in this chemical? 1. Carbon 2. Oxygen There are 2 different types of elements in this chemical, so this means it is a compound

6. How many different elements are in this chemical? H20 1. Hydrogen 2. Oxygen There are 2 different types of elements in this chemical, so this means it is a compound

7. How many different elements are in this chemical? Na 3 1. Sodium There are only 1 kind of atom or element in this chemical, so this means it is not a compound.

8. How many different elements are in this chemical? C6H12O6 1. Carbon 3. Oxygen 2. Hydrogen There are 3 different types of elements in this chemical, so this means it is a compound

9. Is it a Compound or just Element? NH3 O2 CaCl2 NaCl C16 HCl Au11 Ca4 ZnSO4 He CH5N H2SO3

10. Metals Non-Metals Metalloids • Different physical properties are used to determine if a substance is a metal, metalloid, or non-metal. • Conductivity, luster, and malleability are a few of the main ones.

11. Above is an example of where Metals, Metalloids, and Non-metals are located on the Periodic Table. What is an observation you can make about where the 3 are located on the Periodic Table? Be sure you can make out the difference between them on your waterfall.

13. Conductivity This refers to how easily electricity or heat can move through a substance. Metals- electricity/heat moves very easy through metals which is why metal is used for wiring. Metalloids- electricity/heat can move through metalloids, but not easily. Non-metals- electricity/heat cannot move through non-metals very well at all.

14. Luster Luster is the shininess of a substance. • Metals- tend to be more shiny. • Metalloids- tend to be kind of shiny. • Non-metals- tend to be not very shiny. Gold Antimony Sulfur

15. Malleabilty • Metals- tend to be very malleable. • Metalloids- tend to be kind of malleable. • Non-metals- tend to be not very malleable.

16. Density The amount of matter in a given volume or How much matter or stuff is in a certain amount of space

18. 3.75/cm3 Krypton 15g What is the mass of the object? 4cm3 What is the volume of the object? Divide Now what? 3.75/cm3 Answer? What is the unknown substance? Krypton

19. Chains, Webs, and Pyramids

20. Food Chains A sequence of who eats who in a biological community, starting with a plant as the original producer and the consumers that follow.

21. Food Webs • A series of interrelated food chains within a biological community. • A food web is simply a bunch of food chains from an ecosystem all shown together. Where should the arrows be on this food web?

22. Energy Pyramid

23. Energy Pyramid • An Energy Pyramid is a picture that shows how energy is lost as you move through a food chain. • In the Energy Pyramid, energy is always lost as you move up/ down the food chain. • The bottom of the pyramid represents lots of energy and the top very little energy. Draw an arrow to show the flow of energy in the pyramid.

24. Organic Compounds • An organic compound is most any compound that contains at least one atom of Carbon. Often these compounds also contain hydrogen, oxygen, phosphorous, nitrogen, or sulfur. • However, it cannot be an organic compound if it does not contain CARBON.

26. Physical Change- a change in shape, phase, etc. of the material but the material itself is the same before and after the change. The change can be “undone.”

27. Chemical Change- the substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.”

29. Saliva- Chemical, enzymes break food apart chemically Teeth- Physical, breaks food apart Both, churns the food and secretes acid & enzymes Stomach- Chemical, produces bile to break down fats Liver- Small Intestine- Chemical, enzymes Large Intestine- Chemical, enzymes Digestive System- this is the place in your body where food is broken down or changed both physically and chemically so that it can be used for energy.

30. Potential Energy- stored energy such as gravitational energy when you lift an object off the ground or elastic energy when you stretch a rubber band. Kinetic Energy- the energy of motion, the faster an object is moving, the more kinetic energy it has.

31. What 2 places is it where the potential energy is the greatest? Where is the kinetic energy the greatest? What 2 places is it where the kinetic energy is the least? Where is the potential energy the least?

33. 15m/s 4m/s 2m/s 10m/s 250km/h 400km/h

35. 4m/s

37. CHEMICAL NUCLEAR SOLAR ELECTRICAL SOUND ELECTRICAL HEAT (thermal) LIGHT HEAT (thermal)

39. YES, because force is being applied and the nightstand is moving. NO, because force is being applied, but the package is not currently moving. YES, because force is being applied and the weights are moving.

40. Gravity

43. Area of land where all of the water that is under it or drains off the top of it, goes to the same place. Watershed-

44. Surface Water- Water on the surface of the Earth.

45. Water beneath the Earth’s surface, often between saturated soil and rock, that supplies wells and springs. Groundwater-

46. Pollution- The introduction of contaminants into a natural environment that causes instability, disorder, harm, or discomfort to the ecosystem.

47. What would happen if people were polluting this area in the mountains? The pollution would run down the watershed and contaminate the surface and groundwater causing harm to all the ecosystems with which it came into contact.

50. What are some examples of each of the kingdoms starting with Monera? What is the difference between Prokaryotic and Eukaryotic?