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- 1. Multiple ChoiceThe compound potassium sulfate, K2SO4, is composed of2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen2 atoms of potassium, 4 atoms of sulfur, and 4 atoms of oxygentwo molecules of potassium and one molecule of sulfateone molecule of potassium and two molecules of sulfate
- 2. Multiple ChoiceWhich is true about a compound?it is made up of one type of atomit can be formed through a physical reactionit can be changed into simpler substances through a physical changeit is a pur substance containing elements that are chemically combined
- 3. Multiple ChoiceSugar is added to water and the mixture is stirred. Which observation is evidence that the sugar dissolved in the water?less sugar is visiblethe water is cloudythe sugar turned into crystalsbubbles formed in the water
- 4. Multiple ChoiceHow many elements are in one molecule of glucose (C6H12O6)?13622
- 5. Multiple ChoiceThe formula for glucose is (C6H12O6). How many atoms are present in the Glucose compound?161224
- 6. Multiple ChoiceWhich substance is composed of only one type of atom?elementmixturesolution
- 7. Multiple Choice
Which of the the samples shown represent an Element?substance 1substance 2substance 3substance 4 - 8. Multiple ChoiceWhich is the BEST example of a pure substance?peanutsmilkgoldair
- 9. Multiple ChoiceA student passes a magnet over 10 grams of a powder. Four grams of the powder stick to the magnet, while 6 grams do not. Which of these identifies the substance?elementcompoundmixturesolution
- 10. Multiple ChoiceIron filings are thrown into a pile of sand. What is the BEST way to separate this mixture?use a magnet to pick up the sandsift through the sand for all of the ironuse a magnet to pick up the iron filings
- 11. Multiple ChoiceWhere are the mist reactive nonmetals located on the periodic table?the uppermost complete row of the tablethe rows at the bottom of the table connecting two sectionsthe columns at the far left side of the tablethe second column from the right side of the table
- 12. Multiple ChoiceWhich pair of elements has the MOST similar properties?Li and BI and CaK and HeN and P
- 13. Multiple ChoiceWhere are the most reactive metals located on the Periodic Table?the uppermost complete row of the tablethe rows at the bottom of the table connecting two sectionthe column at the far left side of the tablethe second column from the right side of the table
- 14. Multiple ChoiceWhat physical property is a characteristic of all of the elements in the group located in the rightmost column of the periodic table?very high melting pointgas state at room temperaturegood conductor of electric currentextremely brittle solid at room temperature
- 15. Multiple ChoiceWhich BEST describes elements that are shiny, malleable, ductile, and good conductors of heat and electricity?halogensmetalsmetalloidsnonmetals
- 16. Multiple ChoiceWhich property is unique for each element?mass numberatomic numberstate of matter
- 17. Multiple ChoiceWhich statement best describes the organization of the Periodic Table of the Elementsall gases are grouped togethergases easily form compounds with other elementselements within a group have similar propertieselements within a period have the same number of electrons
- 18. Multiple ChoiceSodium reacts with water. Which element is MOST LIKELY to have a similar effect to sodium if it is exposed to water?carbonoxygenlithium
- 19. Multiple ChoiceIf an element has no electrons to share and is stable, what family is it found in?alkali metalsnoble gaseshalogens
- 20. Multiple ChoiceWhich BEST describes elements found in a column of the periodic table?the elements have the same-size atomsthe elements have the same atomic numberthe elements have similar chemical propertiesthe elements are all found naturally in the same physical state
- 21. Multiple ChoiceWhich BEST demonstrates a physical change?change in temperatureformation of a gaschange of state
- 22. Multiple ChoiceJerome mixes two clear liquids together and observes the clear liquiuds turn cloudy white. Based on his observations, which MOST LIKELY occurred?heat was given offrust was producedthe mass increaseda precipitate formed
- 23. Multiple ChoiceWhich MOST LIKELY indicates formation of a precipitate during the reaction of two liquids?the liquids changing colorsa solid appearing in the liquidgas bubbles appearing in the liquidthe temperature of the liquids changing
- 24. Multiple ChoiceWhat happens to water molecules during the boiling process?they move faster and move farther apart as they absorb heatthey move faster and remain close together as they absorb heatthey move more slowly but move farther apart as they lose heatthey move faster and move farther apart as they lose heat
- 25. Multiple ChoiceA scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sound as gas bubbles were forming around it. Which conclusion is best supported by this observation?a chemical change took placethe lithium was dissolved by the waterdissolved gases were releasedwater was vaporized
- 26. Multiple ChoiceWhich shows one example of a physical change and one example of a chemical change?boiling water and melting waxrusting iron and baking a cakedissolving powder and shredding paperfreezing water and burning coal
- 27. Multiple ChoiceA science class is studying the states of matter. One group of students freezes 100 grams (g) of water in a cup. Another group of students melts 50g of ice in a cup. Which of these will most likely occur at the end of the experiment?the temperature of both cups will be the sameboth samples in the cups will be in the same stateboth groups will have the same mass with which they startedthe time required for the changes in states of matter will be the same
- 28. Multiple ChoiceWhich characteristic property of iron is MOST CLOSELY related to the formation of rust?chemical reactivitymelting pointspecific heatsolubility
- 29. Multiple ChoiceSugar is dissolved in a glass of hot water until no more sugar will dissolve. As the glass of hot water cools, a white crystalline solid is observed on the bottom of the glass. Which BEST describes the identity of the white crystalline solid?the white crystalline solid is sugarthe white crystalline solid is an impurity in the waterthe white crystalline solid is produced from the mixture of sugar and water
- 30. Multiple ChoiceWhich describes the change in the mass of water during the freezing process?it stays the sameit increases as the volume increasesit decreases as the volume increasesit decreases as the volume decreases
- 31. Multiple ChoiceWhich is the correct way to balance the chemical equation shown below?
Al+O2→Al2O32Al+O2→Al2O32Al+3O2→Al2O34Al+3O2→Al2O34Al+3O2→2Al2O3 - 32. Multiple ChoiceIf a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?12 atoms of carbon (C)6 atoms of carbon (C)3 atoms of carbon (C)2 atoms of carbon (C)
- 33. Multiple ChoiceWhich BEST explains why the total mass of the product(s) would be less that the total weight of the reactant(s) after a chemical reaction?a physical change occurredatoms involved in the reaction lost massprecipitates were created in the new solutiongases were released to the atmosphere
- 34. Multiple ChoiceHow does a balanced chemical equation satisfy the Law of Conservation of Mass?during a chemical reaction, the total amount of matter stays the sameduring a chemical reaction, matter is destroyedduring a chemical reaction, one or more new substances are formedduring a chemical reaction, the total number of atoms increases
- 35. Multiple Choicea 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?6 grams30 grams60 grams216 grams
- 36. Multiple ChoiceWhen a mixture of Oxygen and Hydrogen is ignited in a test tube, the reaction shown occurs.
Hydrogen + Oxygen → Water + Energy
What happens to the total mass of the contents of the test tube?the total mass increasesthe total mass decreasesthe total mass remains the samepart of the mass is changed to heat energy - 37. Multiple ChoiceA sealed test tube containing 8 grams of iron filings and 5 grams of sulfur is heated until the material in the test tube glows bright red. Which is true about the reaction?the product will have a mass of 13 gramsthe product will have a mass less than 13 gramsthe product will have a mass greater than 13 gramsthe mass of the product cannot be determined
- 38. Multiple ChoiceIn the equation below, suppose 11 grams of zinc react with 12 grams of hydrogen chloride to form 16 grams of zinc chloride and an unknown amount of hydrogen gas.
Zn + 2HCl → ZnCl2 + H2
Based on the Law Of Conservation of Mass, how many grams of hydrogen gas will form?1 gram7 grams19 grams - 39. Multiple ChoiceWhich is true of mass during a chemical reaction?mass increasesmass decreasesmass remains the samemass depends on the chemicals involved
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