Chemistry Intro/Electricity Test
DO NOT WRITE ON THIS TEST; all answers should go on the answer sheet.
1) All elements are composed of extremely small particles called
a) compounds.
b) mixtures.
c) atoms.
d) molecules.
2) A group of atoms that are joined together and act as a single unit is called a (n)
a) element.
b) mixture.
c) molecule.
d) solution.
3) Sugar and salt are two different examples of
a) atoms.
b) elements.
c) mixtures.
d) pure substances.
4) Substances that CANNOT be broken down chemically or physically into other substances are
a) elements.
b) compounds.
c) mixtures.
d) solutions.
5) Mendeleev created the first periodic table by arranging elements in order of
a) decreasing atomic mass.
b) increasing atomic mass.
c) increasing atomic number.
d) increasing melting points and densities.
6) From an element’s location in the periodic table, you can predict
a) its reactivity.
b) its chemical name.
c) its chemical symbol.
d) when it was discovered.
7) Which of these statements about a column of the periodic table is true?
a) The elements have similar properties.
b) The elements have a wide range of properties.
c) The elements have the same atomic number.
d) The elements have the same atomic mass.
8) The factor that determines how an atom interacts with other atoms is its
a) number of protons.
b) number of neutrons.
c) atomic mass.
d) number of electrons in outer shell.
9) The melting point of an element is when it
a) breaks down and starts crying.
b) turns from a solid to a gas.
c) turns from a solid to a liquid.
d) turns from a gas into a liquid.
10) Which of the following elements is Potassium likely to bond with?
a) Neon
b) Fluorine
c) Sodium
d) Gold
11) What happens if you break a magnet in half?
a. One half will have a north pole only and one half will have a south pole.
b. Neither half will have a pole.
c. Each half will have two poles.
d. Neither half will be able to attract or repel.
12) Magnetic poles that are alike
a. attract each other.
b. repel each other.
c. do not react to each other.
d. always point to the north.
13) An example of a common ferromagnetic material is
a. plastic.
b. hydrogen.
c. nickel.
d. copper.
14) The buildup of charges on an object is called
a. static discharge.
b. static electricity.
c. positive charge.
d. negative charge.
15) An electric current produces a(n)
a. magnetic domain.
b. magnetic field.
c. electrical resistance.
d. magnetic pole.
16) Materials that allow the charges of an electric current to move freely through them are called
a. insulators.
b. conductors.
c. resistors.
d. magnets.
17) An example of an insulator is
a. rubber.
b. copper.
c. silver.
d. iron.
18) You can increase the strength of an electromagnet’s field by
a. decreasing the current in the wire.
b. decreasing the number of loops in the wire.
c. using a stronger ferromagnetic material for the core.
d. increasing the thickness of the insulation on the wire.
19) A device that uses electrical energy as it interferes with the flow of current is a(n)
a. insulator
b. conductor.
c. resistor.
d. capacitor.
20) Suppose you acquire a positive charge from walking across a carpet. You then touch a doorknob and receive a shock. This leaves you
a. positively charged.
b. negatively charged.
c. hungry.
d. with no charge.
21) In a series circuit with more than one bulb,
a. there are many paths for the current to take.
b. the remaining bulbs are not affected if one bulb burns out.
c. all of the bulbs become dimmer as more bulbs are added.
d. the bulbs get so bright, that you have to wear sunglasses to look at it.
22) If you are outside during a thunderstorm, the best way to protect yourself from lightning is to
a. use your umbrella.
b. stand under a tall tree.
c. stop, drop, and roll.
d. stay low and dry.
23) An electric current will always follow
a. the leader.
b. a path toward the north pole.
c. the path of least resistance.
d. the path the leads through the insulators.
24) If given the choice of what you would like to eat for dinner, which would you choose?
a) Pizza
b) Sushi
c) Falafel
d) Burrito
e) Just a big handful of candy
Which is more reactive? (for problems 25-27)
25) Calcium or Palladium
26) Iron or Argon
27) Chlorine or Sulfur
28) Which elements react strongly with water?
29) How many protons are in an atom of Bismuth?
30) How many electrons are in an atom of Rhodium?
31) How many neutrons are in an atom of Copper?
32) What is the atomic mass of Tellurium?
33) Draw an electron shell diagram of Iodine.
34) Draw an electron shell diagram of Beryllium.
35) Draw the structure of methanol (CH3OH).
36) Describe two advantages of parallel circuits over series circuits.
37) What is a fuse? How does it work?
38) Draw a circuit with two batteries in series and three bulbs in parallel.
39) What is magnetic declination?
Use the equations below to answer questions 40-42.
V = IR I = V R = V
R I
40) What is the voltage of a circuit with 0.25 amps of current that contains a lamp that has a resistance of 150 ohms?
41) For a current of 3 amps and a voltage of 9 volts, the resistance is ______?
42) Find the current of a circuit in a house (standard household voltage) that has a resistance of 300 ohms.