Cumulative Exam Review

The molar heat of fusion for water is 6.01 kJ/mol. How much energy is released when 36.8 g of water freezes at its freezing point?Use . 6.12 kJ 12.3 kJ 108 kJ 221 kJ

12.3 kJ

What is the electron configuration of chlorine (Cl)? 1s22s22p63s23p3 1s22s22p63s23p5 1s22s22p63s24s23p3 1s22s22p63s23p23d3

1s22s22p63s23p5

This formula equation is unbalanced.BaCl2(aq) + Na2CO3(aq) BaCO3(s) + NaCl(aq)Which coefficient should be placed in front of NaCl to balance this equation? 1 2 3 4

2

What is the percent by mass of water in Na2SO4 • 10H2O?Use . 5.59% 11.26% 44.08% 55.92%

55.92%

Scientists described light as a wave because the results of many experiments with light demonstrated that light behaves as a wave. Light is now described as having properties of both a wave and a particle.What is the most likely reason why this change was made? Enough scientists voted to accept the change. Data collected from many experiments could not be explained using waves. A well-known scientist published a paper that described light as a particle. A single experiment's results demonstrated both wave and particle properties.

Data collected from many experiments could not be explained using waves.

The accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories.The most accurate measurement is made by Dr. Chopra, who measures 13.487 g/mL. Dr. Thompson, who measures 13.5 g/mL. Dr. Smith, who measures 13.54 g/mL. Dr. Tyler, who measures 13.9336 g/mL.

Dr. Smith, who measures 13.54 g/mL.

Long before humans made electronic satellites to orbit the Earth for communications, humans had been observing the moon. Through centuries of thought and experimentation, scientists realized that the invisible force of gravity was holding the moon and other matter in orbit around Earth. Then in the twentieth century, humans began putting their own satellites in orbit. How do the discovery of gravity and the invention of electronic satellites most likely relate to the processes of scientific investigation and technological design? Engineers used the process of technological design to discover how gravity holds matter in orbit, and then scientists investigated satellites in nature. Scientific investigations discovered that gravity holds objects in orbit, and then technological designers used the discovery to develop electronic satellites. Since scientists were curious about gravity, they used the process of scientific investigation to build the first object that would orbit Earth. Technological designers invented the electronic satellite, and then scientific investigators conducted research to learn how and why it orbited around Earth.

Engineers used the process of technological design to discover how gravity holds matter in orbit, and then scientists investigated satellites in nature.

Shown below is a chemical reaction.Fe + CuCl2 FeCl2 + Cu Which pair of substances are the products? Fe and CuCl2 Fe and FeCl2 CuCl2 and Cu FeCl2 and Cu

FeCl2 and Cu

Which is a postulate of the kinetic-molecular theory? Gas particles have a small volume relative to the spaces between them. Gas particles have a large volume relative to the spaces between them. Gas particles are very small in size and always move slowly. Gas particles are very large in size and always move slowly.

Gas particles have a small volume relative to the spaces between them.

Iron reacts with oxygen to form iron oxide (rust). Which best describes this statement? Iron oxide is the liquid state of iron. Iron oxide is the gaseous state of iron. Iron oxide is formed by rearranging atoms. Iron oxide is made up of only iron atoms.

Iron oxide is formed by rearranging atoms.

Based on its location in the periodic table, what can most likely be predicted about sulfur? It has four valence electrons available for bonding. It has four nonbonding electrons. It has six valence electrons available for bonding. It has six nonbonding electrons.

It has six valence electrons available for bonding.

Which equation is a decomposition reaction? Li2CO3 Li2O + CO2 Zn + HCl ZnCl2 + H2 Na2O + CO2 Na2CO3 C6H12O6 + O2 CO2 + H2O

Li2CO3 Li2O + CO2

Sarah carried out an experiment to test a hypothesis. Some of her data supported the hypothesis, but some refuted it. What is the best thing for Sarah to do next? Revise her hypothesis, and then retest it. Assume the refuting data are invalid, and ignore them. Change her data so that they support her hypothesis. Reject her hypothesis completely, and start over.

Revise her hypothesis, and then retest it.

Which statement best compares the melting point of butane (C4H10) with that of octane (C8H18)? The melting points of both substances are identical. The melting point is lower for the substance that has stronger attractive forces. The melting point is higher for the substance that has stronger intermolecular forces. The melting point is not dependent on intermolecular forces.

The melting point is higher for the substance that has stronger intermolecular forces.

Which statement describes the electron sea model for metallic bonding? This model involves electrons held tightly between atoms. This model explains all properties of metals. This model involves electrons moving among bands of orbitals. This model is the simplest model.

This model is the simplest model.

What is a three-dimensional structure that represents the alternating pattern of particles in a crystal? a polyatomic ion a crystal lattice an ionic bond a formula unit

a crystal lattice

When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change? because the metal reaches a high temperature because the metal begins to melt because a new substance is formed because the metal is malleable

because a new substance is formed

The symbol for xenon (Xe) would be a part of the noble gas notation for the element antimony. cesium. radium. uranium.

cesium.

Which will most likely lead to new scientific discoveries in future years? current scientific knowledge current science fiction movies reduction of the elementary school science curriculum rejection of all new scientific ideas

current scientific knowledge

Microscopes are used to study the structures of rocks. Over time, microscopes have become more and more powerful. As a result of this technological improvement, our structural information of rocks now includes fewer minerals. has become increasingly detailed. has become increasingly debatable. now includes the location of electrons.

has become increasingly detailed.

When the process of condensation occurs, the kinetic energy of particles is insufficient to overcome intermolecular forces. becomes independent of temperature. becomes exactly equal to the intermolecular forces. easily overcomes the intermolecular forces.

is insufficient to overcome intermolecular forces.

Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen + lithium oxide lithium lithium + oxygen lithium oxide oxygen + lithium lithium + oxide lithium oxide lithium + oxygen

lithium + oxygen lithium oxide

Chemists use activity series to determine whether which type of reaction will occur? combustion double replacement decomposition single replacement

single replacement

Which of these is an example of a physical change? sugar, when heated, producing carbon dioxide and water solid ice, when heated, turning into liquid water sodium, when exposed to chlorine, forming sodium chloride aluminum, when heated in air, forming aluminum oxide

solid ice, when heated, turning into liquid water

Which is the name of O3? dioxide oxygen trioxygen monoxide

trioxygen