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Investigation & Experimentation
Atomic Structure
Kinetic Molecular Theory
Periodic table
Chemical Bonds
100
A weather balloon with a 2-meter diameter at ambient temperature holds 525 grams of helium. What type of electronic probe could be used to determine the pressure inside the balloon? A barometric B thermometric C calorimetric D spectrophotometric
What is barometric?
100
Matter is made of atoms that have positive centers of neutrons and protons surrounded by a cloud of negatively charged electrons. This statement is A a theory. B a hypothesis. C an inference. D an observation
What is a theory?
100
The random molecular motion of a substance is greatest when the substance is A condensed. B a liquid. C frozen. D a gas.
What is a gas?
100
When a metal is heated in a flame, the flame has a distinctive color. This information was eventually extended to the study of stars because A the color spectra of stars indicate which elements are present. B a red shift in star color indicates stars are moving away. C star color indicates absolute distance. D it allows the observer to determine the size of stars.
What is the color spectra of stars indicate which elements are present?
100
When cations and anions join, they form what kind of chemical bond? A ionic B hydrogen C metallic D covalent
What is an ionic?
200
Which would be most appropriate for collecting data during a neutralization reaction? A a pH probe B a statistics program C a thermometer D a graphing program
What is a pH probe?
200
Which of the following atoms has the largest atomic radius? A barium (Ba) B chlorine (Cl) C iodine (I) D magnesium (Mg)
What is barium (Ba)
200
Under the same conditions of pressure and temperature, a liquid differs from a gas because the molecules of the liquid A have no regular arrangement. B are in constant motion. C have stronger forces of attraction between them. D take the shape of the container they are in. CSC10388
What has stronger forces of attraction between them?
200
Why is cobalt (Co) placed before nickel (Ni) on the periodic table of the elements even though it has a higher average atomic mass than nickel? A Nickel has one more proton. B Cobalt was discovered first. C Nickel has fewer electrons. D Cobalt has a lower density.
Nickel has one more proton
200
The reason salt crystals, such as KCl, hold together so well is because the cations are strongly attracted to A neighboring cations. B the protons in the neighboring nucleus. C free electrons in the crystals. D neighboring anions.
What is Neighboring anions?
300
A scientist observed changes in the gas pressure of one mole of a gas in a sealed chamber with a fixed volume. To identify the source of the changes, the scientist should check for variations in the A air pressure outside the chamber. B molecular formula of the gas. C temperature of the chamber. D isotopes of the gas.
What is temperature of the chamber?
300
Which statement best describes the density of an atom’s nucleus? A The nucleus occupies most of the atom’s volume but contains little of its mass. B The nucleus occupies very little of the atom’s volume and contains little of its mass. C The nucleus occupies most of the atom’s volume and contains most of its mass. D The nucleus occupies very little of the atom’s volume but contains most of its mass.
What is "The nucleus occupies very little of the atom's volume but contains most of its mass"?
300
When a cold tire is inflated to a certain pressure and then is warmed up due to friction with the road, the pressure increases. This happens because the A air molecules hit the walls of the tire less frequently. B rubber in the tire reacts with oxygen in the atmosphere. C air molecules speed up and collide with the tire walls more often. D air molecules diffuse rapidly through the walls of the tire.
What is "air molecules speed up and collide with the tire walls more often?".
300
Generally, how do atomic masses vary throughout the periodic table of the elements? A They increase from left to right and top to bottom. B They increase from left to right and bottom to top. C They increase from right to left and top to bottom. D They increase from right to left and bottom to top.
What is " They increase from left to right and top to bottom? "
300
What type of force holds ions together in salts such as CaF2 ? A electrostatic B magnetic C gravitational D nuclear
What is " electrostatic? "
400
Electrical fires cannot be safely put out by dousing them with water. However, fire extinguishers that spray solid carbon dioxide on the fire work very effectively. This method works because carbon dioxide A displaces the oxygen. B renders the fire’s fuel non-flammable. C forms water vapor. D blows the fire out with strong wind currents.
What is " displaces the oxygen?"
400
Which of the following atoms has six valence electrons? A magnesium (Mg) B silicon (Si) C sulfur (S) D argon (Ar)
What is " sulfur (S)?"
400
Methane (CH4) gas diffuses through air because the molecules are A moving randomly. B dissolving quickly. C traveling slowly. D expanding steadily.
What is " moving randomly?"
400
The most abundant isotope of lead contains 82 protons and 124 neutrons packed closely together in the nucleus. Why do the protons stay together in the nucleus rather than fly apart? A Electrons in neighboring atoms neutralize repulsive forces between protons. B Neutrons effectively block the protons and keep them far apart to prevent repulsion. C Electrostatic forces between neutrons and protons hold the nucleus together. D Nuclear forces overcome repulsive forces between protons in the nucleus.
What is " Nuclear forces overcome repulsive forces between protons in the nucleus? "
400
Some of the molecules found in the human body are NHCHCOOH (glycine), CHO 226126 (glucose), and CH3(CH2)16COOH (stearic acid). The bonds they form are A nuclear. B metallic. C ionic. D covalent.
What is " covalent?"
500
In order to advance to the level of a theory, a hypothesis should be A obviously accepted by most people. B a fully functional experiment. C in alignment with past theories. D repeatedly confirmed by experimentation
What is " repeatedly confirmed by experimentation? ".
500
Why are enormous amounts of energy required to separate a nucleus into its component protons and neutrons even though the protons in the nucleus repel each other? A The force of the protons repelling each other is small compared to the attraction of the neutrons to each other. B The electrostatic forces acting between other atoms lowers the force of repulsion of the protons. C The interactions between neutrons and electrons neutralize the repulsive forces between the protons. D The forces holding the nucleus together are much stronger than the repulsion between the protons.
What is " The forces holding the nucleus together are much stronger than the repulsion between the protons - strong nuclear force?"
500
When someone standing at one end of a large room opens a bottle of vinegar, it may take several minutes for a person at the other end to smell it. Gas molecules at room temperature move at very high velocities, so what is responsible for the delay in detection of the vinegar? A the increase in the airspace occupied by vinegar molecules B the chemical reaction with nerves, which is slower than other sensory processes C attractive forces between the air and vinegar molecules D random collisions between the air and vinegar molecules
What is " random collisions between the air and vinegar molecules? "
500
Which of the following elements has the same Lewis dot structure as silicon? A germanium (Ge) B aluminum (Al) C arsenic (As) D gallium (Ga)
What is " germanium (Ge)? "
500
Which element is capable of forming stable, extended chains of atoms through single, double, or triple bonds with itself? A carbon B oxygen C nitrogen D hydrogen
What is " carbon? "