6th and 7th Grade TEKS

STAAR Review

Elements vs CompoundsElement- a pure substance consisting of only one type of atom.

Compound- a substance consisting of more than one type of atom or element.

CO2How 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

H20How many different elements are in this chemical?

1. Hydrogen 2. Oxygen

There are 2 different types of elements in this chemical, so this means it is a

How many different elements are in this chemical?

1. Sodium

There are only 1 kind of atom or element in this chemical, so this means it is not a compound.

C6H12O6

How many different elements are in this chemical?

1. Carbon3. Oxygen

There are 3 different types of elements in this chemical, so this means it is a

2. Hydrogen

Is it a Compound or just Element?

NH3O2 CaCl2

HClC16NaCl

Ca4Au11 ZnSO4

CH5N He H2SO3

MetalsMetalloids

Non-Metals

•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.

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.

ConductivityThis 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.

LusterLuster 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

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

The amount of matter in a given volumeor

How much matter or stuff is in a certain amount of space

What is the mass of the object?What is the volume of the object? 4cm3

Now what? DivideAnswer?

3.75/cm3

What is the unknown substance?

Krypton15g

Krypton3.75/cm3

Chains, Webs, and Pyramids

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

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?

Energy Pyramid

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.

Organic CompoundsAn 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.

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.”

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.”

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.

Saliva-

Teeth-

Stomach-

Liver-

Small Intestine-

Large Intestine-

Chemical, enzymes break food apart chemically

Physical, breaks food apart

Both, churns the food and secretes acid & enzymes

Chemical, produces bile to break down fats

Chemical, enzymes

Chemical, enzymes

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.

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?

4m/s

CHEMICAL

ELECTRICAL

LIGHT

NUCLEAR

SOUND

HEAT (thermal)

SOLAR

ELECTRICAL

HEAT (thermal)

YES, because force is being applied and the weights are moving.

YES, because force is being applied and the nightstand is moving.

NO, because force is being applied, but the package is not currently moving.

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

Surface Water- Water on the surface of the Earth.

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

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

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.

What are some examples of each of the kingdoms starting with Monera?

What is the difference between Prokaryotic and Eukaryotic?

Which has more biodiversity, a desert or a rainforest? Why?

Which of these is more sustainable?

With CC the ecosystem and it’s biodiversity is destroyed and no future resources can be harvested. With SC the ecosystem is preserved. With the forest left intact, it will regenerate and be available for future harvest.

No soil exists, just rock. No life exists here either.

Soil begins to form for the first time and life begins to take root.

The ecosystem grows and becomes more complex.

The ecosystem is destroyed by some act, natural or manmade.

The ecosystem recovers quickly because soil already exists for new plant life to take root.

In a vegetable garden, the natural ecosystem has been removed and a man made one established. Based upon succession, what would take place if the vegetable garden were left alone for many years?

Eventually succession will take place and nature will reclaim the ecosystem making it wild again. What type of succession is this?

Questions:

1. Is it a nut? Yes go to Q2. No go to Q3.

2. Is it square? Yes is #6 No is #1

3. Is it a nail? Yes is #8. No go to Q4.

4. Is it a screw? Yes go to Q5. No go to Q6.

5. Is it a flat head? Yes is #7. No is #4.

6. Is the head round? Yes is #2. No go to Q7.

7. Is it long? Yes is #5. No is #3.

What are some of the questions we could ask about the insects at each stage of the key?

Number the bugs

Each of these finches have different beaks. Their beaks are designed to help them with the types of food they eat.

The process in nature by which only the organisms best adapted to their environment tend to survive and transmit their genetic characteristics in increasing numbers to succeeding generations while those less adapted tend to be eliminated.

There are several different types of the Galapagos Medium Ground Finch, but they are all considered to have a common ancestor. What would cause them to become so different over time?

1

4

2

3

1. Big strong beak, good for opening large hard seeds.

2. Medium size beak, good for opening soft seeds.

3. Small short beak, good for eating small fruits like berries.

4. Small pointed beak, good for digging insects out of trees and wood.

Extracting energy from food.

Respiration.

Excretion of waste material.

Parts and Functions of a Cell

What type of cell?

Cytoplasm

Chloroplasts

Nucleus

Vacuole

Cell Membrane

Mitochondria

Cell Wall

Nucleus

DNA

Genes

DNA

Provides framework support, movement, protection, storage, and produces new blood cells.

Makes movement of the body possible, moves food through the digestive system, and the heart circulates blood.

To breakdown food into nutrients to be transported to other parts of the body and removal of leftover waste.

The collection and removal of wastes produced by the body before it becomes poisoned.

Designed to transport blood carrying nutrients and waste to all parts of the body as well as immune cells.

To deliver oxygen from the air into our bodies and remove CO2

waste from our bodies.

Interprets sense stimuli, processes responses, and regulates body functions.

Produces hormones that regulate different body functions such as metabolism and sex characteristics.