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- 1. Multiple Choice
What word describes when water is attracted to other substances?cohesionadhesioncapillary actionsurface tension - 2. Multiple ChoiceWhat two elements make up water?Helium and oxygenHydrogen and oxygenhelium and carbonoxygen and carbon
- 3. Multiple ChoiceAttractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are calledCovalent bondsIonic bondsPolar bondsHydrogen bonds
- 4. Multiple ChoiceWhy does ice float?As water freezes, it expands and its density decreases.As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.As water freezes, air becomes trapped between the hydrogen bonds of water molecules.As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.
- 5. Multiple ChoiceWater is a universal solvent because it...It can be found anywhereIt freezes when it gets coldfloats when frozenDissolves most substances
- 6. Multiple ChoiceWhich of the following is LEAST likely to dissolve in water?nonpolar fats and oilspolar sugar moleculessalt made of a positive sodium ion and a negative chloride ionall of the substances will dissolve easily in water
- 7. Multiple ChoiceLarge bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?Water is an acid.Water is a versatile solvent.Water has a high heat capacity.Water acts as a buffer.
- 8. Multiple ChoiceSmall insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?The insects are light enough so that they do not break the hydrogen bonds holding the water molecules togetherThe insects actually use their wings to hover slightly above the water's surface and they only skim it with their feetThe insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surfaceThe insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
- 9. Multiple ChoiceThe tightness across the surface of water that enables paper clips to float is ____________.adhesioncapillary actionsurface tensionpolarity
- 10. Multiple ChoiceWhich statement explains why water molecules stick together?both sides are negativeone side has a positive charge and the other side has a negative chargeone side has a negative charge adn the other side has a neutral chargeboth sides are positive
- 11. Multiple ChoiceWhen a molecule has an opposite electrical charge on each end, it is known as what?cohesionpolar moleculehydrogen bondsolution
- 12. Multiple ChoiceWater beads up on the surface of a penny because of what property?AdhesionHigh Surface TensionUniversal SolventChanges in Density
- 13. Multiple ChoiceThe smallest basic unit of matter is themolecule.atom.compound.cell.
- 14. Multiple Choice
Atoms in molecules share pairs of electrons when they form
covalent bonds.
ionic bonds.
hydrogen bonds.
polymers.
- 15. Multiple Choice
Atoms transfer electrons when they form
covalent bonds.
ionic bonds.
hydrogen bonds.
polymers.
- 16. Multiple ChoiceWhich is considered neutral?pH of 4pH of 9pH of 14pH of 7
- 17. Multiple ChoiceTomato juice has a pH of 4. Determine if it's an acid, base, or neutral.acidbaseneutral
- 18. Multiple ChoiceHousehold bleach has a pH of 12. Determine if it's an acid, base, or neutral.acidbaseneutral
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