Chemical Reactions

Which of the following is a chemical change?

• water freezes to form ice
• sugar dissolves in water
• gasoline burns in a car engine
• a piece of metal expands when it is heated

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NGSS.MS-PS1-2

A change in the shape of an object is an example of _________________.

• a chemical change
• energy
• an endothermic change
• a physical change

What type of change occurs when a new substance is formed that has different properties from the original substances?

• chemical change
• nuclear change
• physical change
• mutation

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following represents a chemical change?

• cutting a piece of paper with scissors
• cooling a mixture of air and kerosene vapor to obtain liquid kerosene
• burning a piece of notebook paper in the presence of oxygen
• heating water over a flame to its boiling point

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NGSS.MS-PS1-2

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

• souring milk
• mixing baking soda and vinegar
• rusting metal
• mixing oil and vinegar

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NGSS.MS-PS1-4

Which of the following is a chemical change?

• the rusting of iron
• dissolving salt in water
• melting an ice cube
• bending a copper wire

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• rusting of a bicycle
• painting a house
• washing a dog
• tearing up a newspaper

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an example of a physical change?

• sodium and chlorine form salt
• a copper ring turns white and green
• a log burns in a fire
• using sand and water to build a sand castle on a beach

In any chemical reaction, the mass of the products is always:

• slightly less than the mass of the reactants
• much less than the mass of the reactants
• the same as the mass of the reactants
• greater than the mass of the reactants

Tags

NGSS.MS-PS1-5

How do chemical reactions turn substances into new substances?

• with burning acid
• the molecules mix together and create new substances
• the atoms break apart and combine back together in new ways
• the ionic compounds mix in water to form solutions

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5