FREE CHEMISTRY AND STUDY GAMES ABOUT

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FREE CHEMISTRY AND STUDY GAMES ABOUT

8SCI_CHEMPHYMATTER EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -28 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: What is not an example of a physical change of water?

Answer:

stirring Question 2: What does breaking a cold pack, causing a sudden drop in temperature demonstrate?

Answer:

a chemical change

Question 3: What is the best evidence that a chemical reaction has occurred?

Answer:

gas formation Question 4: Baking soda and vinegar was mixed and a match was struck. Why did the lit match go out when placed in the mouth of the flask?

Answer:

the baking soda and vinegar reacted to produce carbon dioxide gas. the carbon dioxide gas caused the lit match to go out

Question 5: What physical property of matter illustrates when liquids are placed in a beaker settle into specific layers?

Answer:

density Question 6: What term best describes a chemical reaction that absorbs heat energy?

Answer:

endothermic

Question 7: What is the mass of a piece of paper after it is crumbled?

Answer:

the same as that of the flat paper

Question 8: How would you describe the change to an ice cube as it melts?

Answer:

the change is physical because the substance remains the same

Question 9: What does condensation represent?

Answer:

a physical change Question 10: What has occurred when you have ocean water and the water has evaporated and salt was visible at the bottom of the jar?

Answer:

a physical change

Question 11: What has happened when dough bakes in an oven?

Answer:

a chemical change Question 12: What evidence is used to show a chemical change in matter has occurred?

Answer:

a gas is produced

Question 13: What happens to a substance that changes from a liquid to a solid?

Answer:

a physical change Question 14: What can be concluded when two liquids are mixed together, a solid forms and settles on the bottom of the container?

Answer:

a chemical change has taken place

Question 15: What part of digestion is mainly a chemical change?

Answer:

stomach acids dissolve food into nutrients Question 16: When frozen carbon dioxide is heated, it changes directly into a gas. What physical change has taken place?

Answer:

heat caused a change in state

Question 17: What chemical change occurs due to mixing baking soda and vinegar?

Answer:

gas production Question 18: What characteristic property of iron is most closely related to the formation of rust?

Answer:

chemical reactivity Question 19: What observation would be made if a precipitate reaction will have occurred?

Answer:

cloudy solution Question 20: What chemical change is most likely to involve bubbling or an odor?

Answer:

gas production

Question 21: What best describes the solid that forms when two liquids combine in a chemical reaction?

Answer:

precipitate

Question 22: What is needed to change ice into water?

Answer:

energy

Question 23: What changes occur when burning coal and boiling water?

Answer:

burning coal is a chemical change and boiling water is a physical change

Question 24: What is specific heat?

Answer:

the amount of energy required to raise one gram of a substance 1 degree Celcius to identify unknown substances

Question 25: What is burning paper considered?

Answer:

a chemical change Question 26: Batteries lose effectiveness over time because of chemical reactions that occur in the batteries. Where is the best place to store batteries to keep them for a longer period of time?

Answer:

store them at room temperature Question 27: If you mix two clear liquids together and observe the clear liquids turning cloudy white, what has most likely occurred?

Answer:

a precipitate formed