Grade 10 Objective 4 1 The same amount

Grade 10 Objective 4

1 The same amount of hydrogen gas is in both containers. The pressure in Container B is — A the pressure in Container A B the pressure in Container A C D 2 times the pressure in Container A 4 times the pressure in Container A

2 What is the density at 20°C of 12. 0 milliliters of a liquid that has a mass of 4. 05 grams? A B C D 0. 338 g/m. L 2. 96 g/m. L 16. 1 g/m. L 48. 6 g/m. L

3 What is the mass of a 500. 00 m. L sample of seawater with a density of 1. 025 g/m. L? F 487. 8 g G 500. 0 g H 512. 5 g J 625. 0 g

4 Which of the following objects will float on water? A C B D

5 Students in a chemistry lab measure the time it takes four different 100 m. L solutions to pass through a hole in the bottom of a cup. Which of the following properties of the solutions is most likely being measured? F G H J Buoyancy Mass Viscosity Volume

6 A sample of water from a stream has a greater density than a sample of distilled water. Which is the best explanation for the difference in density? A B C D Streams have kinetic energy. Distilled water has a neutral p. H. Streams can contain dissolved salts. Distilled water can contain dissolved gases.

7 The experiment illustrates that iron and sulfur combine to form — A B C D a nonmetal a compound a mixture an alloy

8 The picture shows a model of the element — A B C D fluorine helium beryllium oxygen

9 Oxygen (O 2) is an example of — A B C D an alloy a molecule a salt a mixture

10 An unknown silvery powder has a constant melting point and does not chemically or physically separate into other substances. The unknown substance can be classified as — A B C D an element a compound a mixture an alloy

11 Which of these are composed of two or more different substances that are chemically combined in a definite ratio? F G H J Compounds Mixtures Elements Solutions

12 Which of these represents a physical change? A B C D Iron rusting Ice melting Wood burning Food spoiling

13 Texas horned lizards must eat a large number of harvester ants each day. The formic acid in the harvester ants helps neutralize a base that the lizard produces. The products from this reaction would be — A B C D an acid and a base a salt and water an acid and water a salt and a base

14 In the rock cycle, which of these is a chemical change involved with the formation of igneous rocks? F Compression of sediments G Heat loss from lava H Subduction of plates J Formation of minerals

15 Which of the following is an example of a chemical change? F Ice cracking G Sugar dissolving H Milk souring J Lead melting

16 Which of these describes a pollution-producing process that involves only a physical change? A B C D Coal with a high sulfur content is burned, producing gases that cause acid rain. Chlorofluorocarbons are released, changing ozone in the upper atmosphere into oxygen. Hot wastewater is discharged into a lake, lowering oxygen levels in the water. Nitrogen oxide emissions combine with water vapor, producing nitric acid.

17 Rust (Fe 2 O 3) forms on an iron (Fe) pipe after prolonged exposure to humid air. What type of change does this illustrate? F G H J Mechanical Nuclear Chemical Physical

18 Sheets of ice containing mostly pure water can be formed by decreasing the temperature of saltwater. Which of these best describes this change? F G H J Chemical change Physical change Nuclear change Atomic change

19 The reaction equation below shows the process of oxidizing iron. Balance the equation by calculating the coefficients. A B C D 2, 3, 1 1, 1, 1 4, 3, 2 4, 2, 2

20 To produce 4 molecules of sugar, a plant needs — F 6 molecules of hydrogen G 12 molecules of ATP H 18 molecules of water J 24 molecules of carbon dioxide

21 What are the coefficients that will balance this chemical equation? A B C D 2, 1, 1 3, 4, 2 2, 2, 1 4, 3, 2

22 The illustrations show a conservation-of-mass experiment. The solution in the beaker lost mass because — F materials have less mass at high temperatures G the mass of the reactants and products was less than 100 g H sodium sulfate (Na 2 SO 4) is lighter than air J some of the water molecules turned into gas

Carbon monoxide (CO) burns readily in oxygen (O 2), forming carbon dioxide (CO 2): __CO(g) + __O 2(g) ® __CO 2(g) 23 What coefficient values will balance the reaction shown above? A B C D 2, 2, 1 1, 1, 1 2, 1, 2, 2

24 In the procedure shown above, a calcium chloride solution is mixed with a sodium sulfate solution to create the products shown. Which of the following is illustrated by this activity? F G H J The law of conservation of mass The theory of thermal equilibrium The law of conservation of momentum The theory of covalent bonding

25 One reason water is an effective solvent is that it — A B C D contains an oxygen atom is a polar molecule has a freezing point of 0°C can evaporate easily

26 What characteristic of water remains the same no matter what is dissolved in it? A B C D The ratio of hydrogen to oxygen The ability to refract light The hydroxide ion concentration The freezing temperature

27 Which factor makes water an effective solvent? F The presence of molecular oxygen G Its lack of covalent bonds H The polar nature of its molecules J Its abundance on Earth’s surface

28 Which of these is a reason that frogs and fish are sensitive to changes in water temperature? A Cold water has a higher concentration of dissolved oxygen than warm water. B Warm water has a higher range of compressibility than cold water. C Cold water has a greater density than warm water. D Warm water has a higher viscosity than cold water.

Solubility Rules 1. All sodium, potassium, and ammonium salts are soluble. 2. All silver, lead, and mercury salts are insoluble. 3. All carbonates, sulfides, and hydroxides are insoluble. 4. All sulfates are soluble except calcium sulfate and barium sulfate. 29 Which of the following salts has the greatest solubility in water at 25°C? F Ca. CO 3 G Fe. S H Hg. Cl 2 J KCl. O 4

30 As a scuba diver goes deeper underwater, the diver must be aware that the increased pressure affects the human body by increasing the — A B C D body’s temperature amount of dissolved gases in the body amount of suspended solids in the body concentration of minerals in the body

31 A recipe calls for 210 grams of sugar to be dissolved in 0. 25 liter of water. After the mixture is stirred, some sugar crystals remain in the water. What can be added to the mixture to help dissolve the remaining sugar crystals? A B C D Thermal energy 2. 0 g of baking soda Ice cubes 2. 0 g of sodium chloride

Grade 10 Objective 4 Answer Key

Grade 10 Objective 4 Answer Key Question Correct Answer Objective Measured Student Expectation 1 C 4 IPC 7 A 2004 Info Booklet – 16 2 A 4 IPC 7 A 2003 TAKS – 31 3 H 4 IPC 7 A 2004 TAKS – 18 4 D 4 IPC 7 A 2004 TAKS – 27 5 H 4 IPC 7 A 2006 TAKS – 22 6 C 4 IPC 7 A 2006 TAKS – 29 7 C 4 IPC 7 E 2004 Info Booklet - 18 8 C 4 IPC 7 E 2003 TAKS – 5 9 B 4 IPC 7 E 2003 TAKS – 9 10 A 4 IPC 7 E 2004 TAKS – 29 11 F 4 IPC 7 E 2006 TAKS – 32 12 B 4 IPC 8 A 2004 Info Booklet – 19 13 B 4 IPC 8 A 2004 Info Booklet – 29 14 J 4 IPC 8 A 2003 TAKS – 36 15 H 4 IPC 8 A 2004 TAKS – 22 16 C 4 IPC 8 A 2004 TAKS - 31 Source - item number

Grade 10 Objective 4 Answer Key Question Correct Answer Objective Measured Student Expectation 17 H 4 IPC 8 A 2006 TAKS – 12 18 G 4 IPC 8 A 2006 TAKS – 18 19 C 4 IPC 8 C 2004 Info Booklet – 17 20 J 4 IPC 8 C 2003 TAKS – 10 21 C 4 IPC 8 C 2003 TAKS – 45 22 J 4 IPC 8 C 2004 TAKS – 30 23 C 4 IPC 8 C 2006 TAKS – 9 24 F 4 IPC 8 C 2006 TAKS – 40 25 B 4 IPC 9 A 2002 Info Booklet – 12 26 A 4 IPC 9 A 2003 TAKS – 41 27 H 4 IPC 9 A 2004 TAKS – 24 28 A 4 IPC 9 D 2004 Info Booklet – 20 29 J 4 IPC 9 D 2003 TAKS – 50 30 B 4 IPC 9 D 2004 TAKS – 9 31 A 4 IPC 9 D 2006 TAKS - 37 Source - item number