GEPA Physical Practice Assessment

GEPA Physical Practice Assessment! :)

Multiple Choice

Identify the letter of the choice that best completes the statement or answers the question.

____ 1. When you add so much solute that no more dissolves, you have a

a. / saturated solution.
b. / unsaturated solution.
c. / neutralization.
d. / suspension.

____ 2. What is one way to increase the solubility of sugar in water?

a. / Heat the water.
b. / Chill the water.
c. / Increase the amount of sugar.
d. / Decrease the amount of water.

____ 3. In a water solution, how do acids differ from bases?

a. / Acids form hydrogen ions (H+), while bases form hydroxide ions (OH–).
b. / Acids turn litmus blue, while bases turn litmus red.
c. / Acids form salts, bust bases do not.
d. / Hydrogen ions (H+) remain dissolved, but hydroxide ions (OH–) do not.

____ 4. The pH scale measures

a. / the strength of an acid.
b. / the strength of hydrogen ions.
c. / the concentration of hydrogen ions.
d. / the concentration of an acid.

____ 5. Compared to the pH of saliva, the pH of stomach juices is

a. / the same.
b. / higher.
c. / lower.
d. / unpredictable.

____ 6. You can find the pH of a substance by using

a. / plain paper.
b. / a thermometer.
c. / litmus indicator.
d. / a conductivity tester.

____ 7. One example of a physical change is

a. / burning paper.
b. / baking cookies.
c. / heating table sugar.
d. / dissolving salt in water.

____ 8. One example of a chemical change is

a. / filtering.
b. / burning wood.
c. / boiling water.
d. / crushing a can.

____ 9. Radio waves, visible light from the sun, infrared “rays” from heat lamps, the waves that heat food in a microwave oven, ultraviolet rays, and X-rays are all considered types of

a. / electrical energy.
b. / electromagnetic energy.
c. / chemical energy.
d. / potential energy.

____ 10. Substances that CANNOT be broken down chemically into other substances are

a. / elements.
b. / compounds.
c. / mixtures.
d. / solutions.

____ 11. The measurement of the force of gravity on an object is the object’s

a. / mass.
b. / volume.
c. / weight.
d. / density.

____ 12. The measurement of how much matter an object contains is its

a. / volume.
b. / weight.
c. / mass.
d. / melting point.

____ 13. The measurement of how much mass is contained in a given volume is called

a. / weight.
b. / melting point.
c. / boiling point.
d. / density.

____ 14. The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams is

a. / 2 g/cm3
b. / 0.5 g/cm3
c. / 500 g/cm3
d. / 5,000 g/cm3

____ 15. Which of the following is NOT an example of a chemical change?

a. / gas burning on a stove
b. / rust forming on an iron fence
c. / salt dissolving in a glass of water
d. / using electricity to break down water into hydrogen and oxygen

____ 16. What holds atoms together in a molecule?

a. / density
b. / gravity
c. / physical bonds
d. / chemical bonds

____ 17. The volume of an irregular object can be measured by

a. / multiplying the object’s length, width, and height.
b. / dividing the object’s density by its mass.
c. / submerging the object in water in a graduated cylinder.
d. / placing the object on a triple-beam balance.

____ 18. Lemonade consists of several substances that are NOT chemically combined, so lemonade is classified as a(n)

a. / element.
b. / compound.
c. / mixture.
d. / pure substance.

____ 19. How do liquid water, ice, and water vapor differ from each other?

a. / They are different states of matter.
b. / They are different compounds.
c. / They are made of different kinds of molecules.
d. / They are made of different kinds of atoms.

____ 20. H2O, CO2, and C12H22O11 are all examples of chemical

a. / properties.
b. / changes.
c. / bonds.
d. / formulas.

____ 21. Each family in the periodic table has its own characteristic properties based on the number of

a. / neutrons.
b. / valence electrons.
c. / protons.
d. / ions.

____ 22. When an atom loses an electron, it becomes a

a. / positive ion.
b. / negative ion.
c. / neutral ion.
d. / neutral atom.

____ 23. Electrons involved in bonding between atoms are

a. / valence electrons.
b. / inside the nucleus.
c. / closest to the nucleus.
d. / positively charged.

____ 24. What is the greatest number of valence electrons an atom can have?

a. / 2
b. / 3
c. / 8
d. / 12

____ 25. If atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have

a. / no valence electrons.
b. / 7 valence electrons.
c. / 8 valence electrons.
d. / 17 valence electrons.

____ 26. Which form of pure carbon is so hard that it can be used in cutting tools?

a. / diamond
b. / graphite
c. / nanotube
d. / fullerene

____ 27. What can you tell about methane (CH4) from its molecular formula?

a. / It contains four carbon atoms.
b. / It contains one hydrogen atom.
c. / It contains four hydrogen atoms.
d. / It forms groups of four molecules.

____ 28. A carbohydrate is made up of the elements carbon and hydrogen, plus

a. / oxygen.
b. / oxygen and nitrogen.
c. / oxygen and sulfur.
d. / oxygen and phosphorus.

____ 29. A disturbance that transfers energy from place to place is called a

a. / wave.
b. / medium.
c. / vibration.
d. / compression.

____ 30. The highest parts of a transverse wave are called

a. / troughs.
b. / crests.
c. / nodes.
d. / wavelengths.

____ 31. Waves that move the particles of the medium parallel to the direction in which the waves are traveling are called

a. / longitudinal waves.
b. / transverse waves.
c. / surface waves.
d. / combination waves.

____ 32. The distance between two corresponding parts of a wave is the wave’s

a. / amplitude.
b. / wavelength.
c. / frequency.
d. / speed.

____ 33. The bending of waves due to a change in speed is called

a. / reflection.
b. / refraction.
c. / diffraction.
d. / interference.

____ 34. The bending of waves around the edge of a barrier is known as

a. / reflection.
b. / refraction.
c. / diffraction.
d. / interference.

____ 35. Waves produced by earthquakes are called

a. / standing waves.
b. / transverse waves.
c. / seismic waves.
d. / longitudinal waves.

____ 36. Longitudinal seismic waves are known as

a. / primary waves.
b. / secondary waves.
c. / surface waves.
d. / transverse waves.

____ 37. Secondary waves CANNOT travel through

a. / rock.
b. / liquids.
c. / Earth’s mantle.
d. / Earth’s crust.

____ 38. Chemistry is

a. / a characteristic of a substance that can be observed without changing the substance into another substance.
b. / the study of matter and how matter changes.
c. / anything that has mass and takes up space.
d. / a rapid reaction between oxygen and a substance called a fuel.

____ 39. Which of the following is NOT a correct inference that you can make about the burning of gasoline?

a. / Chemical bonds are broken and others are formed.
b. / The reaction is a physical change.
c. / New substances are produced.
d. / Energy is released.

____ 40. A chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be

a. / balanced.
b. / unbalanced.
c. / an incomplete reaction.
d. / a replacement reaction.

____ 41. CaCO3 represents a chemical

a. / symbol.
b. / formula.
c. / subscript.
d. / reaction.

____ 42. The substances listed on the left side of a chemical equation are the

a. / products.
b. / coefficients.
c. / precipitates.
d. / reactants.

____ 43. Which of the following is a balanced chemical equation?

a. / H2O2 ® H2O + O2
b. / 2 Fe2O3 + 3 C ® 4 Fe + 3 CO2
c. / SO2 + O2 + 2 H2O ® 4 H2SO4
d. / 2 Mg + HC1 ® MgCl2 + H2

____ 44. The number placed below an element’s symbol in a chemical formula is called a

a. / subscript.
b. / coefficient.
c. / reactant.
d. / product.

____ 45. As in the case of unlike magnetic poles, unlike electric charges

a. / attract each other.
b. / repel each other.
c. / exist in pairs.
d. / do not interact.

____ 46. The buildup of charges on an object is called

a. / static discharge.
b. / static electricity.
c. / positive charge.
d. / negative charge.

____ 47. Clothes in a dryer acquire static cling by

a. / friction.
b. / conduction.
c. / induction.
d. / static discharge.

____ 48. The loss of static electricity as electric charges move off an object is called

a. / friction.
b. / conduction.
c. / induction.
d. / static discharge.

____ 49. 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. / uncharged.
d. / electrically neutral.

____ 50. According to Ohm’s law, resistance is equal to voltage divided by

a. / time.
b. / conduction.
c. / current.
d. / potential.

____ 51. In a series circuit with three bulbs, adding another bulb will

a. / make the nearest bulb brighter.
b. / make some of the bulbs dimmer.
c. / make all the bulbs brighter.
d. / make all the bulbs dimmer.

____ 52. In a parallel circuit with three bulbs,

a. / the bulbs must all be located on the same branch.
b. / there is only one path for the current to take.
c. / current from each bulb has its own path.
d. / the overall resistance increases if a new branch is added.

____ 53. The charge on a proton is

a. / negative, and the charge on an electron is positive.
b. / positive, and the charge on an electron is negative.
c. / the same as the charge on an electron.
d. / can change according to the situation.

____ 54. Materials that allow the charges of an electric current to move freely through them are called

a. / insulators.
b. / conductors.
c. / resistors.
d. / magnets.

____ 55. How did chemists change Mendeleev’s periodic table in the early 1900s?

a. / They included chemical properties such as bonding power.
b. / They included physical properties such as melting point and density.
c. / They used atomic mass instead of atomic number to organize the elements.
d. / They used atomic number instead of atomic mass to organize the elements.

____ 56. Most metals are NOT

a. / ductile.
b. / good conductors of heat and electricity.
c. / liquid at room temperature.
d. / malleable.

____ 57. In the periodic table, the most reactive metals are found

a. / in Group 1, the first column on the left.
b. / in Period 1, the first row across the top.
c. / in Groups 13 through 16 in the center.
d. / in Periods 6 and 7 at the bottom.

____ 58. Which group contains the most elements?

a. / metalloids
b. / nonmetals
c. / metals
d. / transition elements

____ 59. The sun is made up mostly of

a. / hydrogen.
b. / iron.
c. / carbon.
d. / beryllium.

____ 60. In an atom, the number of protons equals the number of

a. / nuclei.
b. / electrons.
c. / neutrons.
d. / isotopes.

____ 61. The elements in a column of the periodic table

a. / have similar properties.
b. / are in the same period.
c. / have the same atomic mass.
d. / have very similar chemical symbols.

____ 62. What information in the periodic table indicates the number of protons in an atom?

a. / the position of the element in its column
b. / the element’s chemical symbol
c. / the element’s atomic number
d. / the element’s atomic mass

____ 63. The elements that do not ordinarily form compounds are

a. / elements in the carbon family.
b. / metals.
c. / halogens.
d. / noble gases.

____ 64. The ability to do work is called

a. / velocity.
b. / energy.
c. / conversion.
d. / friction.

____ 65. The energy associated with motion is called

a. / kinetic energy.
b. / elastic potential energy.
c. / gravitational potential energy.
d. / nuclear energy.

____ 66. The total potential and kinetic energy of the particles in an object is called

a. / mechanical energy.
b. / thermal energy.
c. / chemical energy.
d. / electrical energy.

____ 67. An example of something that stores chemical energy is

a. / lightning.
b. / a microwave.
c. / a match.
d. / light.

____ 68. What type of conversion is taking place when natural gas is used to heat water?

a. / chemical energy into thermal energy
b. / thermal energy into mechanical energy
c. / mechanical energy into electromagnetic energy
d. / electromagnetic energy into chemical energy

____ 69. When you rub your hands together on a cold day, you use friction to convert

a. / mechanical energy into thermal energy.
b. / thermal energy into nuclear energy.
c. / nuclear energy into electrical energy.
d. / electrical energy into electromagnetic energy.

____ 70. Fossil fuels contain energy that originally came from

a. / tidal forces.
b. / Earth’s core.
c. / the sun.
d. / dinosaurs.

____ 71. Which of the following has kinetic energy?

a. / a rock poised for a fall
b. / an archer’s bow that is drawn back
c. / a rolling bowling ball
d. / a car waiting at a red light

____ 72. Niagara Falls is a good example of

a. / kinetic energy being converted into potential energy.
b. / potential energy being converted into kinetic energy.
c. / energy being lost.
d. / energy being created.

____ 73. The law of conservation of energy states that when one form of energy is converted into another,