Unit 1 8P1.3 & 8P 1.4 [319358]StudentClassDate

1. Which is the best example of a heterogenous mixture? 

 

A. sugar 

 

B. brass 

 

C. salad 

 D. salt water

 

   

2. Which of these is a physical change that takes place in a garden?  

 A. Insects eat the leaves of a plant for food.

 

 B. Flowers grow after a summer rain

shower.  

 C. Earthworms loosen soil as they travel through

it.  

 D. Leaves convert sunlight to sugar by photosynthesis.

 

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3. How many elements are in one molecule of glucose (C6H12O6)? 

 A. 1

 

 B. 3

 

 C. 6

 

   

4. When a molecule is separated into its component parts, it forms  

 A. compounds.

 

 B. atoms.

 

 C. protons.

 

 D. ions.

 

   

5. A substance is found containing two types of atoms. Some atoms have 3 protons, 4 neutrons and 3 electrons, while other parts of the sample have 3 protons, 3 neutrons and 3 electrons. Which is most likely the substance? 

 

A. ion 

 

B. element 

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C. mixture 

   

6. Which chemical compound contains the greatest number of nitrogen (N) atoms? 

 A. NO3

 

 B. N2O5

 

 C. NH4NO3

 

 D. (NH4)3PO4

 

   

7. Iron filings are thrown into a pile of sand. What is the best way to separate this mixture? 

 A. Use a magnet to pick up the sand.

 

 B. Sift through the sand for all of the iron.

 

 C. Use a magnet to pick up the iron filings.

 

   

8. Which is an example of a mixture? 

  A. sodium

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chloride 

 B. fruit punch

 

 

C. water 

   

9. Hydrogen peroxide has one more oxygen atom than the compound water. What is the result of this extra oxygen atom? 

 A. It makes peroxide more soluble than water.

 

 B. It makes peroxide more carbonated than water.

 

 C. It changes most of the properties of the compound.

 

   

10. Which substance is a compound? 

 

A. salt 

 

B. sodium 

 

C. chlorine 

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D. saltwater 

   

11. Which best explains why the alkali metals are the most reactive group in the periodic table? 

 A. They are radioactive.

 

 

B. They have complete outer energy levels. 

 C. They have the highest atomic masses of any elements.

 

 D. They have only one electron in their outer energy level.

 

   

12. Element X reacts with the elements of Group 17 (VIIA) of the periodic table. The compounds produced in these reactions have one atom of element X for every one atom of a Group 17 element. To which group does element X most likely belong? 

 A. Group 1 (IA)

 

 B. Group 2 (IIA)

 

 C. Group 13 (IIIA)

 

 D. Group 16 (VIA)

 

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13. Which element has similar characteristics to lithium (Li) and potassium (K)? 

 A. helium (He)

 

 B. sodium (Na)

 

 C. beryllium (Be)

 

 D. magnesium (Mg)

 

   

14. Which statement best describes the organization of the Periodic Table of the Elements?  

 A. All gases are grouped together.

 

 B. Gases easily form compounds with other elements.

 

 C. Elements within a group have similar

properties.  

 D. Elements within a period have the same number of electrons.

 

   

15. Where on the periodic table are you most likely to find elements that do not react with other elements? 

 A. group 1

 

  B. group 17

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 C. group 18

 

   

16. Which element in Period 3 is known to be a highly reactive metal? 

 A. sulfur (S)

 

 B. argon (Ar)

 

 C. sodium (Na)

 

 D. scandium (Sc)

 

   

17. Which best describes elements that are shiny, malleable, ductile, and good conductors of heat and electricity? 

 

A. halogens 

 

B. metals 

 

C. metalloids 

  D. nonmetal

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s 

   

18. Which best explains how elements are arranged on the modern periodic table? 

 A. Elements are arranged from fewest protons to most protons.

 

 B. Elements are arranged from most protons to fewest protons.

 

 

C. Elements are arranged from fewest neutrons to most neutrons. 

   

19. Which elements are most likely to react in the same manner in a chemical reaction? 

 A. elements in the same group

 

 

B. elements in the same period 

 

C. elements with similar atomic masses 

   

20. When two clear solutions are mixed together in equal amounts, a solid bright yellow substance settles out of the solution. Which best describes what has occurred? 

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A. A physical change created a new yellow solution. 

 

B. A chemical change created a new yellow solution. 

 

C. A physical change created a new yellow precipitate. 

 

D. A chemical change created a new yellow precipitate. 

   

21. A beaker contains a sample of water with a mass of 325 grams. The water in the beaker is boiled and weighed again after it cools. The new mass of the water is 305 grams. In this example of the conservation of matter in physical changes,  

 A. the mass is less after it cools because water has less mass as a

gas.  

 B. the mass of the water was 305 grams and the mass of the water vapor was 20 grams.

 

 C. the process of boiling destroyed 20 grams of the water and left 305 grams of

water.  

 D. the heat energy created by boiling water makes up the rest of the

mass.  

   

22. Two identical containers each hold one liter of water. One container is kept at room temperature as a liquid. The other container is placed in a freezer and kept as a solid. Which property is most likely to be the same in both states of matter?  

 A. density

 

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 B. mass

 

 C. shape

 

 D. volum

e  

   

23. A student kept a notebook during an investigation. Which recorded observation was most likely a physical change?  

 A. The solution was heated for two minutes until it

boiled.  

 B. A solid formed when two liquids were mixed together.

 

 C. Two solutions were mixed and the resulting solution felt

hot.  

 D. The color of two mixed solutions changed from clear to white.

 

   

24. What is the best evidence for a chemical reaction? 

 

A. color change 

 

B. cutting a metal 

 

C. change of state 

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25. Juan Carlos placed 35 grams of ice into a dry, 200-gram container. The top of the container was attached tightly. When the ice was completely melted, the student massed the container with the liquid water. What mass of liquid water should be in the container?  

 A.   35 grams

 

 B. 165 grams

 

 C. 200 grams

 

 D. 235 grams

 

   

26. The drawing shows solid carbon dioxide changing into carbon dioxide gas.

Which statement describes the relationship between the solid carbon dioxide and the carbon dioxide gas after all of the solid has changed to gas?  

 A. They have the same volume.

 

 B. The gas has less volume than the

solid.  

 C. They have the same mass.

 

 D. The gas has less mass than the solid.

 

   

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27. Which part of digestion is mainly a chemical change?  

 A. Teeth break food into small

pieces.  

 B. Throat muscles push food toward the stomach.

 

 C. Stomach acids dissolve food into nutrients.

 

 D. Intestinal cells transport nutrients into the blood.

 

   

28. A student placed a small chip of limestone into a hydrochloric acid solution, and carbon dioxide gas was released. The carbon dioxide provided evidence that  

 A. only a physical change occurred.

 

 B. a chemical change occurred.

 

 C. only a loss of mass occurred.

 

 D. the formation of an element

occurred.  

   

29. Which describes the change in the mass of water during the freezing process? 

 A. It stays the same.

 

 B. It increases as the volume increases.

 

  C. It decreases as the volume increases.

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 D. It decreases as the volume decreases.

 

   

30. When frozen carbon dioxide is heated, it changes directly into a gas. Which statement best indicates that a physical change has taken place?  

 A. Heat caused an increase in gas production.

 

 B. Heat caused a new substance to form.

 

 C. Heat caused a decrease in energy.

 

 D. Heat caused a change in state.

 

   

31. An artist carves a statue by chipping off pieces from a marble slab.

Which of these is the best reason to describe the carving as a physical change?  

 A. The statue is the same substance as the slab.

 

 B. The statue is made from a natural material.

 

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 C. The artist uses a chisel to make the statue.

 

 D. The artist will work many hours to make the statue.

 

   

32. Which is the best evidence that the creation of a precipitate is the result of a chemical reaction? 

 

A. demonstrates gas production 

 

B. demonstrates a temperature change 

 

C. demonstrates a new substance has formed 

   

33. Which is a physical change?  

 A. a piece of wood burning

 

 B. a copper roof changing color

 

 C. rust forming on an iron fence

 

 D. a sheet of paper shredding

 

   

34. What is the best way to measure the gas produced in a chemical reaction? 

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 A. Perform the experiment in a beaker.

 

 B. Perform the experiment in a room.

 

 C. Perform the experiment in a closed system.

 

   

35. When two liquids are mixed together, a solid forms and settles on the bottom of the container. What can be concluded? 

 A. Each liquid was a different color.

 

 

B. A chemical change has taken place. 

 

C. The temperature of the liquids decreased. 

 D. The solubility of the liquids has decreased.

 

   

36. Which best explains how elements combine in different ways to produce compounds? 

 A. state of matter

 

 

B. chemical reactivity 

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C. similar physical properties 

 

D. matching atomic numbers 

   

37. A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be inferred?  

 A. The acid boiled when poured into the beaker.

 

 B. The acid and powder formed a new

product.  

 C. A physical reaction produced a gas mixture.

 

 D. A reaction occurred that produced

heat.  

   

38. Which occurs when a precipitate forms during a chemical reaction? 

 

A. color change 

 B. production of a gas

 

 

C. temperature change 

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 D. production of a solid

 

   

39. A potter molded wet clay into the shape of a bowl and let it dry.

The potter knows that the clay went through a physical change when it became a bowl because the bowl  

 A. is a different color than the wet clay.

 

 B. is the same substance as the wet clay.

 

 C. has a different texture than the wet clay.

 

 D. holds the same amount of water as the wet clay.

 

   

40. Students performed an investigation on how aluminum cans taken to a recyle center were able to be reused. They found out an aluminum can undergoes which type of change?  

 A. a physical change because the can is heated

 

 B. a chemical change because new metal is formed

 

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 C. a physical change because the material remains the

same  

 D. a chemical change because an old can is changed into a new

can  

   

41. As a glass of carbonated water is at room temperature, small bubbles are observed to form on the inside surface of the glass. Which best describes the identity of the bubbles observed on the inside surface of the glass? 

 A. The bubbles are oxygen gas from the water.

 

 B. The bubbles are hydrogen gas from the water.

 

 C. The bubbles are carbon dioxide used to carbonate the water.

 

   

42. Read the chemical equation.

CH4 + 2O2 CO2 + 2H2O + energy

What is the best description for this equation? 

 A. Energy is absorbed.

 

 B. Energy is released.

 

 C. Energy stays the same.

 

   

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43. Which demonstrates a chemical change? 

 A. ice melting in a warm soda

 

 B. molten gold freezing to form a ring

 

 C. breaking a cold pack, causing a sudden drop in temperature

 

   

44. How many methane (CH4) molecules would be needed to produce 13 carbon dioxide (CO2) molecules?

CH4 + 2O2 → CO2 + 2H2O  

 A. 4

 

 B. 13

 

 C. 26

 

 D. 52

 

   

45. Which is a balanced chemical equation according to the law of conservation of mass? 

 A. CH4 + O2 → CO2 + 2H2O

 

  B. CH4 + O2 → 2CO2 + H2O

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 C. CH4 + 2O2 → CO2 + 2H2O

 

 D. 2CH4 + O2 → CO2 + 2H2O

 

   

46. A compound containing lithium and sulfur reacts with a compound containing aluminum and iodine. Which best describes the elements present in the products of this reaction? 

 

A. lithium and iodine 

 B. aluminum and sulfur

 

 C. aluminum, sulfur, and iodine

 

 D. lithium, sulfur, aluminum, and iodine

 

   

47. Which best describes a chemical reaction applying the law of conservation of mass? 

 

A. an equation which uses energy 

 B. an equation which does not use energy

 

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C. a balanced equation in which the reactants and products are equal 

 

D. an unbalanced equation in which the reactants and products are unequal 

   

48. A 12-gram sample of magnesium (Mg) reacts with an 18-gram sample of sulfur (S) when heated. Magnesium sulfide (MgS), a solid crystalline material, is formed. What mass of MgS is most likely produced? 

 A. 6 grams

 

 B. 30 grams

 

 C. 60 grams

 

 D. 216 grams

 

   

49. A experiment was conducted to test the law of conservation of mass. At the end of the experiment, only 82% of the mass of the initial reactants was present. The experiment was repeated three times with similar results. Which best explains why some of the mass was lost? 

 A. The mass escaped as a gas.

 

 B. The mass transformed into a liquid.

 

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 C. The mass remained part of the reactant.

 

 D. The mass turned into a heavier chemical.

 

   

50. What best explains the result of substances of a chemical reaction? 

 A. A new substance is produced.

 

 

B. The same substance is produced. 

 C. More energy is produced in the substance.

 

   

51. What is the total number of oxygen atoms on the reactant side of the equation shown below?

CH3COOH + NaHCO3 → CH3COONa + H2O + CO2

  

 A. 2

 

 B. 3

 

 C. 5

 

 D. 7

 

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52. A student mixed 10 grams of a powdery substance with 200 grams of an acid solution. A bubbly solution weighing 205 grams was formed. Which best explains why the mass of the new solution does not equal the mass of the reactants? 

 A. The other 5 grams changed color.

 

 B. The other 5 grams created a precipitate.

 

 C. The other 5 grams were released as a gas.

 

 D. The other 5 grams weighed less in the acid.

 

   

53. Which must be true if the number of atoms stays the same regardless of how they are arranged? 

 A. Their total mass must change.

 

 B. Their total mass stays the same.

 

 C. An open system must have been used.

 

   

54. How many copper atoms and how many chlorine atoms are in a molecule of CuCl2? 

 A. one copper atom, one chlorine atom

 

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 B. one copper atom, two chlorine atoms

 

 C. two copper atoms , one chlorine atom

 

   

55. When 5 grams of silver nitrate are added to a 50 gram solution of potassium chloride, 2 grams of silver chloride form in the solution as a precipitate. After the reaction, the total weight of the solution is 55 grams. Which evidence from the experiment supports the law of conservation of mass? 

 

A. The final weight of the product equals the weight of the reactants. 

 

B. The final weight of the product is less than the weight of the reactants. 

 

C. The weight of the precipitate is less than the amount of silver nitrate. 

 

D. The weight of the precipitate is greater than the amount of silver nitrate. 

   

56. When chemicals react in a closed container, which must be true? 

 A. The mass both before and after the reaction is the same.

 

 B. The mass both before and after the reaction is variable.

 

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C. The same number of compounds is present both before and after the reaction. 

   

57. Which is best represented by the equation?2Mg + O2   2MgO 

 A. Law of Conservation of Energy

 

 B. Law of Conservation of Mass

 

 C. Law of Superposition

 

   

58. A chemistry teacher combines 20 grams of lemon juice with 25 grams of baking soda in a flask covered with a balloon. The flask and balloon have a combined mass of 105 grams. What is the mass of the entire setup after a reaction has occurred? 

 A. 45 grams

 

 B. 150 grams

 

 C. 605 grams

 

   

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