NGSS.MS-PS1-2

Which is an example of a chemical reaction?

• paper cut into small pieces
• chocolate melting in a pan
• flour and sugar mixed in a bowl
• cookies baking in an oven

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NGSS.MS-PS1-2

Which of the following would be evidence that a chemical change has occurred?

• change in size
• change in state
• new substance formed
• change in shape

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NGSS.MS-PS1-2

Is rust forming on a bike that has been left outside in the rain an example of a physical or chemical change?

• Physical Change
• Chemical Change

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NGSS.MS-PS1-2

A change in which NEW substances are formed.

• Chemical change

• Physical change

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NGSS.MS-PS1-2

What type of reaction occurs when you react an acid with an alkali?

• combustion

• decomposition

• no reaction

• neutralisation

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NGSS.MS-PS1-2

Which of the following 2 are chemical reactions?

• sugar dissolving in water

• water turning into steam

• burning wood

• mixing baking soda and vinegar

• tearing paper

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NGSS.MS-PS1-2

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beaker on a shelf overnight. The next morning, the students recorded observations about the metal and the solution in the box below.

Based on their obsevations, can the students correctly conclude that a chemical reaction occurred?

• No, because the metal strip was still visible

• Yes, because a new material of a different color formed on part of the metal strip

• No, because the solution stayed blue

• Yes, because the volume of the blue solution stayed the same

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NGSS.MS-PS1-2

Which is not a clue that could indicate a chemical change has occurred?

• Change in color

• Change in shape

• Release of energy

• Formation of an odor

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NGSS.MS-PS1-2

A science teacher mixes calcium chloride and vinegar in a test tube. He passes the test tube around for his students to feel. The students notice that the test tube is hot. The science teacher asks the students to decide if the mixing of the two chemicals involved a physical or chemical change. He also asks the students to justify their answer. Which student gave the correct response?

• Student 1: The change was physical because a temperature change occurred.

• Student 2. The change was chemical because a temperature change occurred.

• Student 3: The change was physical because the two chemicals mixed.

• Student 4: The change was chemical because the two chemicals mixed.

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NGSS.MS-PS1-2

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

• Chopping wood

• Creating origami

• Fireworks

• Painting a picture

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NGSS.MS-PS1-2