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- 1. Multiple ChoiceEvidence of a chemical reactions is anything that shows -a new substance has formeda solid dissolved in a liquidinteraction between 2 gasesa change in the state of matter
- 2. Multiple Choice
Shirin breaks Xavier's pencil. What type of change has occurred?
physical
chemical
property
puberty
- 3. Multiple Choice
Which of these is NOT a sign that a chemical change has occurred?
A change in mass
An unexpected color change
A temperature change
The formation of a new substance
- 4. Multiple Choice
Which of the following is a chemical change?
water freezes to form ice
sugar dissolves in water
wood burns in a campfire
a piece of metal expands when heated
- 5. Multiple Choice
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
The shape of the coal changes
Oxygen is present
A change in color
Coal is made up of more than one element
- 6. Multiple Choicea copper penny turning greenish after a few years.Chemical ChangePhysical Change
- 7. Multiple ChoiceAn gel ice pack getting cold after you put it in the freezer for an hour.Chemical ChangePhysical Change
- 8. Multiple Choice
The smell made from spraying perfume.
Chemical Change
Physical Change
- 9. Multiple ChoiceThe smell your dog makes after eating to much people food.Chemical ChangePhysical Change
- 10. Multiple ChoiceWhich of the following is a chemical change?the rusting of irondissolving salt in watermelting an ice cubebending a copper wire
- 11. Multiple ChoiceHow do chemical reactions turn substances into new substances?with burning acidthe molecules mix together and create new substancesthe atoms break apart and combine back together in new waysthe ionic compounds mix in water to form solutions
- 12. Multiple ChoiceWhen two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:a chemical reaction took placethe two substances had low boiling pointsone substance dissolved in the otherthe two substances are non-reactive
- 13. Multiple Choice
All of the following are indicators of a chemical reaction except one. Which one is NOT an indicator that a chemical reaction has taken place?
the production of heat or light
a color change
the production of gas bubbles
the dissolving of one substance in another
- 14. Multiple Choice
chemical change or physical change?
chemical change
physical change
- 15. Multiple ChoiceJoel asked Gabby what she could do to an egg to chemically change it. Gabe answered correctly and said...You can drop the egg.You can cook the egg.You can crack the egg.You can paint the egg.
- 16. Multiple Choice
chemical change or physical change?
chemical change
physical change
- 17. Multiple Choice
chemical change or physical change?
chemical change
physical change
- 18. Multiple Choice
chemical change or physical change?
chemical change
physical change
- 19. Multiple Choice
A student places a piece of a potato into a container of hydrogen peroxide and observes bubbles forming around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles -
could show that a gas is forming
always rise to the top of a liquid.
are almost always perfectly spherical.
usually burst after a few minutes.
- 20. Multiple Choice
Hydrogen peroxide breaks down to form water and oxygen gas. A thermometer indicates an increase in temperature. Which observation is evidence that a chemical reaction has occurred?
The mass of the solution remains the same.
Phase changes are observed.
The color of the solution remains clear.
The temperature of the solution increases.
- 21. Multiple ChoiceIn a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained.
How many of the listed observations indicate a new substance was formed?1234 - 22. Multiple ChoiceFour students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?investigation 1investigation 2investigation 3investigation 4
- 23. Multiple ChoiceIs ths a chemical or a physical change?Chemical changePhysical change
- 24. Multiple Choice
A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?
The level of the substance in the beaker is higher after the other liquid is added.
A yellow solid forms and then settles to the bottom of the beaker.
- 25. Multiple Choice
Indicator of a new substance
Change in shape
Change in mass
Change from a liquid to a solid
Change form a solid from a gas
- 26. Multiple Choice
Definition of a precipitate
Change from solid to a liquid
Formation of a gas
Change from a gas to liquid
Formation from liquids to a solid
- Answer choicesTagsAnswer choicesTags