GMAS Unit 1 Physical and Chemical Change

John's father cooks on his outdoor grill by burning wood. John notices that the wood turns into ashes at the bottom of the grill as it burns. John claims that this is a chemical change.

• The ashes are a new mixture.

• The ashes are a different shape.

• The ashes are a new substance.

• The ashes are a different state of matter.

Tags

NGSS.MS-PS1-2

A student stirs together two cups of flour and one cup of rice in the same bowl as shown. Which statement BEST describes what the student has created?

• The mixture is an example of a physical change because the properties of each ingredient remain the same and it can be separated. Separating the contents of the bowl back into their original forms would provide evidence that only a physical change occurred.

• The mixture is an example of a chemical change because the ingredients experience a change in state and it can be separated. The mixture is an example of a physical change, not a chemical change, and the ingredients do not experience a change in state.

• The mixture is an example of a chemical change because the properties of each ingredient change and it cannot be separated. The properties of the ingredients remain the same when mixed together.

• The mixture is an example of a physical change because the ingredients create a new substance and it cannot be separated. The mixture does not result in the formation of a new material, and the ingredients can be separated.

A student combines water, sugar, and sand in a beaker. The picture shows the mixture. How can the student remove the water from the mixture so the beaker only has sugar and sand left?

• The student can settle the mixture causing the water to sit above the sugar and sand.

• The student can stir the mixture causing the water to blend into the sugar and sand.

• The student can freeze the mixture causing the water to change state.

• The student can heat the mixture causing the water to evaporate.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A student performed an investigation as shown. [Diagram: Two beakers with clear liquid at 20°C (71°F) are poured together, resulting in a beaker with a bright blue liquid at 20°C (71°F)] Which BEST describes what type of change occurred in the investigation?

• A. A physical change occurred because when the two liquids were combined, there was a color change. A change in color is evidence of a chemical change, not a physical change.

• B. A chemical change occurred because when the two liquids were combined, there was a color change. When the two clear liquids were combined, the product resulted in a liquid with a blue color. This is evidence of a color change.

• C. A physical change occurred because when the two liquids were combined, the temperature remained the same. There was a change in color, which is evidence of a chemical change, not a physical change.

• D. A chemical change occurred because when the two liquids were combined, the temperature remained the same. The temperature remaining the same is not evidence of a chemical change. The change in color is evidence of a chemical change.

Tags

NGSS.MS-PS1-2

A student performs four investigations as shown. In which investigation did the student observe a chemical change?

• Investigation 1, because there was a phase change

• Investigation 2, because a new substance was formed

• Investigation 3, because there was a temperature change

• Investigation 4, because it resulted in different shape

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The apple has a different shape after being cut, but it is still the same substance. Is this evidence of a chemical change?

• Yes

• No

Tags

NGSS.MS-PS1-2

When baking soda is combined with vinegar, bubbles and gas begin to form. What type of change happens to the baking soda and vinegar?

• a physical change because matter is transforming into a different state

• a chemical change because matter is transforming into a different state

• a chemical change because matter is reacting to form a new substance

• a physical change because matter is reacting to form a new substance

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When liquid water changes to a solid, what does the temperature do, and what type of change is this?

• The temperature decreases, and this is a chemical change.

• The temperature increases, and this is a physical change.

• The temperature increases, and this is a chemical change.

• The temperature decreases, and this is a physical change.

Tags

NGSS.MS-PS1-4

According to the passage and pictures, what are the steps involved in making pancakes?

• Mix dry pancake mix and water, then cook the batter on the stove

• Cook dry pancake mix on the stove, then add water

• Add water to cooked pancakes

• Weigh the pancakes before cooking

According to the scale shown in the picture, what is the weight of the dry pancake mix?

(a)