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- 1. Multiple ChoiceWater (H2O) and table salt (NaCl) can be combined to form salt water. How can this combination be classified?As a compound because the water and table salt are chemically combinedAs a compound because the water and table salt form a new pure substanceAs a mixture because the water can be evaporated and physically separated from the table salt
- 2. Multiple ChoiceWhich best describes an element?It is the simplest form of matterIt can be changed into a compoundIt can be broken down into simpler mixturesIt is composed of more than one type of atom
- 3. Multiple ChoiceA group of science students used water, filter paper and a hot plate to separate a mixture of salt and sand. Which of the following did the students most likely do first?Shake the mixture until the sand settles on the bottomPour the mixture through the filter paperHeat the mixture on the hot plateDissolve the salt by adding water to the mixture
- 4. Multiple ChoiceHydrogen peroxide has one more oxygen atom than the compound water. What is the result of this extra oxygen atom?It makes peroxide more soluble than waterIt makes peroxide more carbonated than waterIt changes most of the properties of the compound
- 5. Multiple ChoiceThe smallest part of an element that retains the properties of the element is theprotonnucleuselectronatom
- 6. Multiple ChoiceHow many elements are in the compound sulfuric acid, H2SO4?123
- 7. Multiple ChoiceWhich two elements make up household ammonia, NH3?Neon and heliumNeon and hydrogenNitrogen and heliumNitrogen and hydrogen
- 8. Multiple ChoiceWhen potassium and bromine atoms form chemical bonds, which of these is produced?An elementA mixtureA compoundA new form of matter
- 9. Multiple ChoiceWhat do the atomic numbers represent?Number of atomsNumber of protonsNumber of neutrons
- 10. Multiple ChoiceWhich best explains how elements are arranged on the modern periodic table?Elements are arranged from fewest protons to most protonsElements are arranged from most protons to fewest protonsElements are arranged from fewest neutrons to most neutrons
- 11. Multiple ChoiceWhich property is unique for each element?Atomic numberMass numberState of matter
- 12. Multiple ChoiceWhat best describes the reactivity of alkali metals?Reactivity increases left to right across a periodReactivity decreases left to right across a periodReactivity increases down a group
- 13. Multiple ChoiceWhich action results in a chemical change?Apples being cut into slicesWood burning in a fireplaceWet clothes drying on a clotheslineSnow being shoveled off of a sidewalk
- 14. Multiple ChoiceWhat changes when gases condense to form liquids?Physical massPhysical stateChemical reactivityChemical composition
- 15. Multiple ChoiceWhich best represents a physical property of a substance?Acids act as a corrosive to metalGold has a density of 19.3 g/cm3Sodium combines with chlorine to create sodium chlorideHydrochloric acid reacts with zinc metal creating hydrogen gas
- 16. Multiple ChoiceWhich is the best evidence that a chemical change in matter has occurred?A solid meltsA gas is producedMatter is destroyed during a chemical reaction
- 17. Multiple ChoiceWhich term describes the relationship between the mass and volume of a substance?DensitySolubilitySpecific heatMelting point
- 18. Multiple ChoiceWhich of these is not an example of a physical change?BoilingStirringFreezingEvaporating
- 19. Multiple ChoiceA sea creature releases a liquid into the ocean that reacts with the water to form a seashell. Which process does this represent?FreezingGas formationChange of statePrecipitate formation
- 20. Multiple ChoiceA student kept a notebook during an investigation. Which recorded observation was most likely a physical change?The solution was heated for two minutes until it boiledA solid formed when two liquids were mixed togetherTwo solutions were mixed and the resulting solution felt hotThe color of two mixed solutions changed from clear to white
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