Unit 6 Changes in Reactants and Products

Which of the following is an example of a chemical reaction?

• Water evaporating from a pot on a hot stove
• Sand being removed from sea water by filtration
• A spoonful of sugar dissolving in a glass of water
• A white solid forming when two clear liquids are poured together
  

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NGSS.MS-PS1-2

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Which of the following always results from a chemical reaction?

• Fire
• Bubbles
• A new substance that is a solid
• A new substance that can be a solid, liquid, or gas
  

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NGSS.MS-PS1-2

Which of the following is an example of a chemical reaction?

• A marshmallow turning black when heated over a fire
• A powder dissolving in water to make lemonade
• An ice cube melting into a puddle of water
• Salt crystals being crushed into a powder
  

Which of the following is an example of a physical change?

• The surface of a copper penny changing color after being in a drawer for years
• Melted butter becoming a solid when placed in the refrigerator
• A car rusting when exposed to the air and rain
• Bread toasting
  

Chemistry is

• a characteristic of a substance that can be observed without changing the substance into another substance.
• the study of matter and how matter changes.
• anything that has mass and takes up space.
• a rapid reaction between oxygen and a substance called a fuel.
  

Which of the following is NOT a correct inference that you can make about the burning of gasoline?

• Chemical bonds are broken and others are formed.
• The reaction is a physical change.
• New substances are produced.
• Energy is released.
  

What happens when chemical bonds break and new bonds form?

• a physical change
• a chemical reaction
• matter is destroyed
• surface area increases
  

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NGSS.MS-PS1-2

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CaCO₃ represents a chemical

• Symbol
• Formula
• Subscript
• Reaction

The only sure evidence for a chemical reaction is

• the formation of a gas.
• a color change.
• the production of one or more new substances.
• changes in properties.
  

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NGSS.MS-PS1-2

The substances listed on the left side of a chemical equation are the

• Products
• Coefficients
• Precipitates
• Reactants

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NGSS.MS-PS1-2

NGSS.MS-PS1-5