Science final Test

Table salt (sodium chloride) is a commonly used ionic compound that is the product of the reaction between sodium and chloride ions.

What is the symbol and the name of the cation that makes up table salt?

• 1. The symbol is Cl2-and the name is the chloride (II) ion.

• 1. The symbol is Na2+ and the name is the sodium (II) ion.

• 1. The symbol is Cl-and the name is the chloride ion.

• 1. The symbol is Na+ and the name is the sodium ion.

Calcium bromide is the product of calcium and bromide ions. What is the formula for calcium bromide?

• CaBr

• CaBr2

• Ca2Br

• Ca2Br2

A student conducts an investigation on a bar magnet with unlabeled poles. To determine which side of the magnet is north (N) or south (S), what steps can the student take?

• 1. The student can cut the bar magnet in half and observe the direction of the

     magnetic field on each individual piece.

• 1. The student can place the bar magnet near a nonmetal surface and observe the

     direction of the magnetic field on the surface.

• 1. The student can place the bar magnet near a metallic surface and observe the

     direction of the magnetic field on the surface.

• 1. The student can place the bar magnet near the known pole of a second magnet and observe the interaction between the poles.

A 0.30-m-long solenoid made up of 1520 loops carries an unknown current. The magnetic field through the solenoid has a magnitude of 0.25 T.
What is the current through the wire of the solenoid?

• 1. 39.3 A

• 1. 0.500 A

• 1. 48.6 A

• 1. 0.750 A

5. Two point charges are arranged in a straight line. The point charge q1 has a charge of +7 μC . The point charge q2 is located 0.02 m to the left of q1 and has a charge of +2 μC. What is the net electrostatic force on q2?
   

• 5. −2 μC to the right

• 0. 314.65 N to the left

• 0. 6.29 μC to the left

• 0. 700 N to the right

5. A proton, a neutron and an electron are placed in a row. The proton experiences___________ force from the neutron. The electron will ___________ the proton. The net charge from all three particles is ___________.

• 1. a large amount of; move away from; +1 μC

• 1. zero; not move in relation to; +1 C

• 1. zero; move toward; 0 C

• 1. very little; move toward; −1 C

The wire of the simple circuit should be made of a material with more __________. In order for the circuit to produce the largest current, the two resistors are put in__________with each other. Both resistors should have a very __________cross- sectional area and a ________________ to increase the flow of electrons.

• 1. bound electrons; series; small; low resistivity

• 1. delocalized electrons; series; large; short length

• 1. delocalized electrons; parallel; small; high resistivity

• 1. bound electrons; parallel; large; long length

8. Which of the following is an example of herbivory affecting an ecosystem?
   

• 8. Tall trees block the sunlight from reaching plants on the forest floor.
     

• 8. Coyotes catch slow-moving rabbits, but not the faster rabbits.
     

• 8. Deer eat the stems of plants without thorns, allowing plants with thorny stems to

     thrive.

• 0. Fungi break down dead organic matter, which returns nutrients to the soil.

8. A tropical rain forest is an example of a climax community, meaning it is a stable community that generally, but not always, returns after a disturbance. From which of the following disturbances would a tropical rain forest be MOST likely to recover?

• 1. A hurricane blows over trees along a coastline.

• 1. The land is cleared of trees and used for farming.

• 1. A new species of fungus infests and kills the common types of trees.

• 1. A new herbivore arrives in the forest, and it feeds on the roots of many trees.

8. Yasmine states that tapeworms are common parasites of goats. Walter claims that the relationship between a tapeworm and goat should be classified as predator and prey. Which fact about tapeworms and goats is MOST useful for Yasmine to cite to refute Walter’s claim?

• 1. Tapeworms get their energy from food that they obtain from goats.

• 1. Tapeworms benefit from their relationship with goats.

• 1. Goats do not benefit from their relationship with tapeworms.

• 1. Tapeworms live inside a goat’s body in a close relationship the goat.