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Other, Chemistry
6th -
8thgrade
Physical changes, Chemical properties and chemical changes
25 questions
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- 1. Multiple Choicewhat is the definition of chemical change?any change that results in the formation of new chemical substances.changing clothesmatter cannot be created or destroyed, only change formchanges affecting the appearence of a chemical substance, but not its chemical composition.
- 2. Multiple Choicewhat is burning?physical changephysical propertychemical changechemical property
- 3. Multiple Choicewhich one is a chemical property?densitycombustibilitysolubilityall of the above
- 4. Multiple Choice
which one is NOT a physical change?
evaporation
boiling
melting
burning
- 5. Multiple Choicewhich one is NOT a chemical change?rustingrottingboilingcorroiding
- 6. Multiple Choicewhat is a phase change (change in state)?physical propertychemical propertychemical changephysical change
- 7. Multiple Choicewhat is solubility?chemical propertyphysical propertygeorgechemical change
- 8. Multiple ChoiceOne cup of water is left outside for two days when it was checked there was only half a cup left. What happened?evaporation; chemical changecondensation; physical changeevaporation; physical changecondensation; chemical change
- 9. Multiple Choice
True or false: melting is a chemical change
true
false
- 10. Multiple ChoiceTRUE OR FALSE: You can look at matter and observe the chemical properties.TRUEFALSE
- 11. Multiple ChoiceIs wood burning a physical or chemical change?PhysicalChemical
- 12. Multiple ChoiceIs Gatorade powder dissolving in water physical or chemical change?PhysicalChemical
- 13. Multiple ChoiceIs sharpening a pencil a physical or chemical change?PhysicalChemical
- 14. Multiple Choice
Is silver oxidizing (tarnishing) a physical or chemical change?
Physical
Chemical
- 15. Multiple Choice
Which of the following is NOT a clue (evidence) that a chemical reaction has taken place?
Changing size
Changing color
A gas being formed
Formation of a precipitate
- 16. Multiple Choice
Which of the following IS an indicator (evidence) that a chemical change has occurred?
State of matter change
Size Change
Change in temperature
Shape change
- 17. Multiple ChoiceWhat happens in ALL chemical changes?Change in state of matterA new substance is formedBubbles are producedAn explosion
- 18. Multiple ChoiceWhen iron fillings are mixed with sand, the iron can be removed using a magnet. This is evidence that the change that occurred when the two were mixed was....physicalchemicalirreversiblemolecular
- 19. Multiple ChoiceWhat kind of properties can only be observed when a substance changes into a different substance?physical propertieschemical propertiesliquid propertiesreal properties
- 20. Multiple ChoiceWhat type of change is this?A chemical changeA physical change
- 21. Multiple ChoiceMixing the metal Sodium with the gas Chlorine will react and create table salt (NaCl). This type of change is a ______.Physical changeChemical change
- 22. Multiple Choice
John hypothesized that dissolving salt into water produced a chemical reaction because the salt completely disappeared in the water. He dissolved 10g of salt in the 500 mL of water. After leaving the beaker in the sunlight for a few days, the water completely disappeared, and the salt crystals were left in the bottom of the beaker. Based on this observation, John knew his hypothesis was INCORRECT because
The salt failed to completely dissolve in the water
The sunlight caused the chemical reaction to stop
The temperature of the water was below room temperature
The salt and water were separated by a physical process
- 23. Multiple Choice
A student mixed two clear liquids in a beaker, then covered the beaker and let it sit. White crystals formed at the bottom of the beaker. The student concluded that the crystals are a new substance formed by the two liquids. Which of the following observations, if made by the student, MOST supports the student’s conclusion?
The liquid in the beaker remained clear.
The crystals have different properties than the original clear liquids.
The mass of the liquid in the beaker has remained the same
The beaker has not vibrated or move from its original spot.
- 24. Multiple Choice
A student added white crystals to a clear liquid. The crystals dissolve in the liquid. After a few seconds, the liquid became quite warm and then turned bright blue in color. The FIRST indication (piece of evidence) that a chemical change was taking place could be observed when…
The crystals were added to the liquid
The crystals were dissolved in the liquid
The temperature of the liquid increased
The color of the mixture changed
- 25. Multiple Choice
A student watches an ice cube melt into a puddle of water. Has a chemical reaction (chemical change) taken place?
Yes, a gas has been given off
Yes, the color has changed
No, no new substances have formed
No, water does not react chemically
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