TCAP

Spring 2014

Item Release

EOC Chemistry

1100793 1 2 3 4 5 A B C D E Printed in the USA ISD11706

1

Which diagram models the particle spacing when a solid changes to a gas?

A

B

C

D

TEC110173_D  

2

Item # 1

Which periodic property decreases from left to right across the periodic table?

A atomic mass

B atomic radius

C ionization energy

D electronegativity

TEC110151_B  

3

Item # 2

The energy diagram shows the reaction pathway of a chemical reaction.

Which of these identifies and describes the heat change in the chemical reaction represented by the diagram?

A exothermic, heat is absorbed

B exothermic, heat is released

C endothermic, heat is absorbed

D endothermic, heat is released

 

TEC110203_B  

4

Item # 3

In a colligative properties experiment, a lab group prepares four solutions and one pure solvent sample. What is the purpose of the pure solvent sample?

A It will serve as a control for the experiment.

B It will rule out phase changes as a source of error.

C It will allow the lab group to predict the colligative properties of the solvent.

D It will help the lab group remember what solvent is being used in the experiment.

TEC110124_A  

5

Item # 4

The graph shows the first ionization energies of some elements.

Which statement best explains the differences in the first ionization energies shown in the graph?

A Atoms with a greater mass have a stronger gravitational force pulling on the electrons.

B An increased number of protons and more complete orbitals cause electrons to be held more tightly. C Atoms containing many electrons lose them easily because the electrons repel one another.

D An imbalance between the number of protons and neutrons destabilizes the electron configuration.

TEC110027_B

6

Item # 5

The diagram shows the particle arrangement and spacing of a solid substance.

Which diagram shows how the particles of the solid substance will look after it has absorbed enough heat to melt partially?

A

B

C

7

Item # 6

D

TEC110204_A  

8

CONFIDENTIAL 34

A graph of the solubility of several compounds is shown.

Which of these would result in a saturated solution at 50°C when dissolved in 100 grams of water?

A 30 grams of NaCl B 50 grams of KCl

C 80 grams of KNO3

D 100 grams of NaNO

3

TEC110254_C  

9

Item # 7

Based on the periodic table, which pie chart best indicates the distribution of metals, nonmetals, and metalloids?

A Pie Chart 1

B Pie Chart 2

C Pie Chart 3

D Pie Chart 4

TEC110148_A  

10

Item # 8

In the late 1800s, Mendeleev developed a periodic table of the elements based largely on atomic mass. Which development in the early 1900s extended and supported Mendeleev’s arrangement of elements on the periodic table?

A spectral determination of atomic numbers

B measurement of decay rates of atomic particles

C calculation of electronic charge in atomic orbitals

D classification of the types of atomic bonding

TEC110001_A

11

Item # 9

When a student performs an acid-base test on a household cleaner, red litmus paper turns blue. Based on the results, which statement is a valid conclusion?

A It is an acid.

B It is a base.

C It is neutral.

D It is a salt.

TEC110292_B  

12

Item # 10

Which mass of NaCl is equal to 0.80 mole of NaCl?

A 47 g

B 59 g

C 73 g

D 105 g

TEC110182_A  

13

Item # 11

Which statement best describes two substances forming a covalent bond?

A Two nonmetals combine because they share valence electrons.

B Two nonmetals combine because they equally share ionization energy.

C A metal and a nonmetal combine because they have opposite charges.

D A metal and a nonmetal combine because they unequally share electrons.

TEC110208_A  

14

Item # 12

How many moles are present in 45.0 g of lithium oxide (Li2 O) ?

A 1.50 moles

B 3.20 moles

C 45.0 moles

D 90.0 moles

TEC110114_A  

15

Item # 13

Four groups of students performed an experiment to determine the heat capacity of aluminum. The table shows their results.

The accepted value for the heat capacity of aluminum is 0.90 J/g •°C. Which group had results that were precise but lacked accuracy?

A Group 1

B Group 2

C Group 3

D Group 4

TEC110007_D  

16

Item # 14

When 10 liters of a gas at 1 atm is compressed to 3 liters at constant temperature, what property of the gas changes?

A The number of moles of gas decreases.

B The mass of the gas increases.

C The size of the gas particles decreases.

D The pressure of the gas increases.

TEC110413_D  

17

Item # 15

What is the approximate concentration of 116 grams of NaCl when dissolved in enough water to make 3.0 liters of solution?

A 0.66 M

B 2.0 M

C 3.0 M

D 58 M

TEC110408_A

18

Item # 16

Which equation is correctly balanced?

A BaCl2 + Na2SO4 → BaSO4 + 2NaCl

B BaCl2 + Na2SO4 → 2BaSO4 + 2NaCl

C 2BaCl2 + 4Na2SO4 → BaSO4 + NaCl

D BaCl2 + 2Na2SO4 → BaSO4 + 2NaCl

TEC110447_A  

19

Item # 17

Which of these is the chemical formula for calcium chloride?

A CaCl B CaCl2

C Ca 2 Cl

D Ca2Cl2

TEC110232_B  

20

Item # 18

Which type of mixture forms when sugar is completely dissolved in water?

A compound

B solution

C colloid

D suspension

TEC110322_B  

21

Item # 19

Which statement accurately describes mixtures and compounds?

A Mixtures and compounds require separation by physical means.

B Mixtures and compounds require separation by chemical means.

C Mixtures can be separated by physical means, while compounds require separation by chemical means. D Mixtures require separation by chemical means, while compounds can be separated by physical means.

TEC110237_C  

22

Item # 20

TEC110093_D

Which equation represents a double replacement reaction?

A + →2 32Fe(s) 3Cl (g) 2FeCl (s)

B +→4 3 2 2NH NO (s) N O(g) 2H O(g)

C + +→3 3 2Cu(s) 2AgNO (aq) 2Ag(s) Cu(NO ) (aq)

D + +→3 3AgNO (aq) NaCl(aq) AgCl(s) NaNO (aq)

23

Item # 21

The solubility graph shows potassium nitrate (KNO3 ) and sodium chloride (NaCl) dissolved in 100 g of water.

Approximately at what temperature will equal amounts of potassium nitrate and sodium chloride dissolve in 100 g of water?

A 0°C

B 10°C

C 25°C

D 40°C

TEC110512_C  

24

Item # 22

Which Lewis electron-dot structure best represents the sulfur atom at ground state?

A

B

C

D

TEC110136_A  

25

Item # 23

2NaN3 (s) → 2Na(s) + 3N2 (g) Using the balanced chemical equation, how many grams of sodium azide (NaN3 ) are required to produce 2.0 L of nitrogen gas (N2 ) at STP?

A 1.9 g

B 2.5 g

C 3.9 g

D 5.8 g

TEC110213_C  

26

Item # 24

Calcium (Ca) reacts with oxygen (O2 ) to produce calcium oxide (CaO).

Ca + O2 → CaO Which of these shows the balanced chemical equation for the production of calcium oxide?

A Ca + O2 → CaO

B Ca + O2 → 2CaO

C 2Ca + 2O2 → 2CaO

D 2Ca + O2 → 2CaO

TEC110380_D  

27

Item # 25

During the extreme winter months, why do car tires need to be readjusted for the decrease in temperature?

A because tire pressure decreases due to the drop in temperature

B because tire pressure remains the same due to the drop in temperature

C because the volume of air increases due to the drop in temperature

D because the volume of air remains the same due to the drop in temperature

TEC110286_A  

28

Item # 26

Students perform an investigation to verify the property of change in matter as a physical or chemical change. They dissolve an effervescent antacid tablet in water. Which observation indicates a chemical change occurred?

A The tablet dissolved in the water.

B The mass of the resulting solution increased.

C The temperature remained the same.

D The resulting solution produced a gas.

TEC110105_D

29

Item # 27

The partial chemical equation represents a reaction involving silver chloride (AgCl).

AgCl → What are the products of this reaction?

A Cl2 + Cl2

B AgCl + Cl2

C Ag + Cl

D Ag + Cl2

TEC110130_D

30

Item # 28

How many electrons are represented in the Lewis electron-dot structure of an element with 14 electrons and 14 protons in the neutral state?

A 2

B 4

C 8

D 14

TEC110296_B  

31

Item # 29

Solutions of calcium chloride and potassium phosphate produce a white precipitate when mixed with each other. Which term describes this reaction?

A combustion

B decomposition

C single replacement

D double replacement

TEC110060_D

32

Item # 30

A student received three 20 mL samples of sodium chloride solution and measured the boiling points using a thermometer, a hot plate, and a fume hood. The results are presented in the table.

Which statement most likely explains the differences in the sample boiling points?

A The hot plate was heated at different temperatures.

B The solute concentrations were different for each sample.

C The sample volumes were measured differently.

D The samples were heated for different lengths of time.

TEC110084_B  

33

Item # 31

What is the name of the chemical compound N2O5?

A dinitrogen oxide

B nitrogen oxide

C nitrogen hydroxide

D dinitrogen pentoxide

TEC110507_D  

34

Item # 32

The partial chemical equation represents the composition reaction between magnesium (Mg) and chlorine (Cl2 ).

Mg + Cl2 →

What is the product of this reaction?

A MgCl

B MgCl2

C Mg 2 Cl D Mg2 Cl2

TEC110238_B  

35

Item # 33

The chemical equation shows the reaction between aluminum and copper(II) chloride.

2Al(s) + 3CuCl2 (aq) → 2AlCl3 (s) + 3Cu(s) How many grams of copper will 0.50 mole of aluminum produce in the chemical reaction between aluminum and copper(II) chloride?

A 21 g

B 32 g

C 48 g

D 54 g

TEC110214_C  

36

Item # 34

Several teams of students wanted to test the hypothesis that a chemical reaction will occur faster at higher temperatures. Which of these provides evidence of a bias-free conclusion?

A Each student developed his or her own conclusion.

B Each team of students agreed on one conclusion.

C Each team of students independently repeated the experiment to obtain precise data.

D The students duplicated the previously published results by adjusting the data.

TEC110123_C  

37

Item # 35

A company is trying to design an alternative to gas-powered automobiles in an effort to reduce carbon dioxide emissions and improve the quality of people’s lives. Which of these will have the least impact on the company as it designs the alternative automobile?

A how much the design will cost

B how efficient and safe the design is

C how convenient and easy to use the product is

D how much carbon dioxide is available in the atmosphere

TEC110469_D  

38

Item # 36

Which statement is consistent with the Bohr model of an atom?

A Electrons exhibit wave properties with certain wavelengths.

B Electrons release energy as they move to higher energy levels.

C Electrons orbit the nucleus in circular orbits at specified energy levels.

D Electrons occupy orbitals that represent their probability of location.

TEC110453_C  

39

Item # 37

Which diagram represents the 3s orbital of magnesium?

A

B

C

D

TEC110221_A  

40

Item # 38

T C110425_AE

Which graph illustrates the radioactive half-life concept of the change in the mass of a radioactive sample over time?

A

B

C

D

41

Item # 39