Name______Class _____ Date______

Benchmark 2: Study Guide~ “answer key”

“Electricity”

  1. Static Electricity is a build-up of electric charges (electrons). Examples are: clothes sticking together coming out of the dryer & touching a doorknob and getting a shock.
  2. Attract meansto pull towards or stick together.
  3. Repel means to pull apart or away from.
  4. What is a good way to separate sand and pebbles?

A good way to separate sand and pebbles is to use a sieve; A sieve is a strainer that is used to separate items.

  1. What is the best way to test a prediction?

A good way to test a prediction is to conduct multiple trials or tests. Then draw a conclusion from the data collected in your tests.

  1. How can matter be changed from one state to another?

Matter can be changed from one state to another by adding heat (energy) or removing heat (energy).

  1. When two oppositely charged objects stick together what is it considered?

It is considered attraction; because two oppositely charged objects attract.

  1. If you leave an ice cube on the table what stages will it go through?
  1. Melting-changing from a solid to a liquid
  2. Evaporation-changing from a liquid to a gas
  1. Which is NOT a physical change?

Grating cheese

Grinding black pepper

Cooking eggs

  1. List objects that are good conductors.

Metals, people, and water are ALL good conductors of electricity.

Insulators are: Items like rubber, wood, glass, and plastic.

  1. What are the characteristics of a chemical change?

Heat or burning involved, forms a new substance, and gives off an odor/color change.

  1. What are the characteristics of a physical change?

Change in: color, size, shape, or texture

  1. Electrons move to cause a buildup of charges.
  2. A conductor is: A material that easily allows electricity to flow.
  3. An insulator is:A material that slows or stops the flow of electricity.
  4. Opposite charges attract and like charges repel.
  5. The safest way to conduct an experiment with electrical circuits is to stay away from water.
  6. A switch turns an electrical circuit on and off.
  7. The law of the conservation of mass is An object is equal to the sum of its parts (ex: The mass of an apple cut into 4 pieces is the same as the mass of the whole apple.)
  8. Which of the following requires the strongest magnification?

Atom or molecule

  1. Explain how the particles move in each of the following.

Solidparticles are very close together and vibrate in place

Liquid particles are packed close enough that they slide past each other

Gas particles are spread randomly and move very fast.

  1. How do you separate a mixture?

Using a filter, cutting, or by evaporation

  1. What are the characteristics/components of an electromagnet?

You must have the following:

A)_An iron core (like a nail, magnet, or an object made of iron)

B)_Current carrying wire (ex: wire made of metal material)

C)__A power source (ex: a battery)

D)_Adding more coils strengthens the electromagnet (i.e.-gives it the ability to pick up more objects and heavier objects)

24.An electric current can move on a pathcalled a circuit.

25. Electricity is another name for electric current and is formed when electric charges move in a circuit.

26. Electric charges must be flowing or moving to have an electric current.

27. A complete or closed circuit is made up of: a bulb (an output device), two wires (connecting bulb and power source), and a battery (power source) . A switch is ONLY needed to turn the electrical device on or off.

28. A switch is not necessary to make a circuit complete.

29. Adding more coils can make an electromagnet stronger.

30. What will happen between the north and south poles of a magnet?

The poles will attract or come together because they have opposite charges.

31. Who is responsible for inventing the microscope? Robert Hooke

32. What are the 7 levels in the classification system (in order from largest-smallest)?

1) Kingdom 2) Phylum 3) Class 4) Order

5) Family 6) Genus 7) Species

33. What is classification? Why do scientists classify living things?

Classification is the grouping of similar things according to a specific characteristic.

Scientist classifies living things to make learning and sharing information easier.

34. Name the 5 kingdoms and give characteristics and examples of each.

Name / Characteristic / Example
1. Monerans
(Bacteria) / *NO Nucleus
*Can’t make own food / Strep throat, ear infection
2. Protist / *Single-celled
*Some contain chloroplast
*Has a nucleus / Algae, tiny animal-like creatures living in pond water
3. Fungi / *Multi-cellular
*Don’t contain chloroplast
*Don’t move on own / Mushrooms, mold, mildew, yeast
4. Animal / *Multi-cellular
*Don’t contain chloroplast
*Can move on own
*Rely on other organisms for food / Fish, birds, lion, tiger, people
5. Plant / *Multi-cellular
*Contain chloroplast
*Don’t move on own / Pinetree, rose plant, orange tree

Science Benchmark 2 --2013~STUDY GUIDE---- “ANSWER KEY”