HMS Formation of a new substance checkpoint

If we have any substance,it can be concluded that a chemical change has happened if....

• there is a color change.

• the state of matter changes.

• there is a decrease in mass.

• the matter is stirred thoroughly.

Tags

NGSS.MS-PS1-2

Which of the following situations provides evidence that a chemical change has taken place?

• Water, when boiled, evaporates and turns into vapor.

• Sugar, when added to ice tea, dissolves into the liquid.

• Two liquids are mixed, and a solid substance forms.

• A piece of paper is cut into many small pieces.

Tags

NGSS.MS-PS1-2

Which of the following would indicate the formation of a new substance?

• A liquid turns to a solid.

• Bubbles and fizzing occur.

• A sample of metal melts.

• A solid is dissolves in a liquid.

Tags

NGSS.MS-PS1-2

Four substances were mixed with clear liquid. The observations are recorded in the following table. Based on the observations, for which mixture is there the best evidence that a new substance was formed?

• Substance 1

• Substance 2

• Substance 3

• Substance 4

Tags

NGSS.MS-PS1-2

A student notices that sugar, when heated over a flame, turns black. How does the student know that a new substance is being formed?

• The temperature of the sugar increases.

• The color of the sugar changes to black.

• Sugar began to melt within the test tube.

• Sugar started as white crystals.

Tags

NGSS.MS-PS1-2

The image shows what happens when cold medicine tablets are placed in room-temperature water.

What evidence would indicate that a new substance is produced?

• The tablets dissolve in water.

• The water becomes cloudy.

• The water level increases slightly.

• Bubbles are given off.

Tags

NGSS.MS-PS1-2

A student measures out 100 mL of two different clear liquids and then pours one into the other. The mixture, which has volume of 200 mL, turns bright red, then begins to become quite cold. In this process, the first evidence that a new substance had formed was observed when the...

• student measured the liquids.

• volume was seen to be 200 mL.

• color changed to bright red.

• temperature of the mixture decreased.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Four mixtures are made by combining two clear liquids and observations are made. Which results indicate that a new substance has formed?

• Mixture 1: The combined liquids have a greater mass than either of the starting liquids.

• Mixture 2: The liquids, when mixed, produce a white solid which settles to the bottom.

• Mixture 3: The mixture of the two liquids takes the shape of the container they are in,

• Mixture 4: The denser of the two liquids lies below the other less dense liquid.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following observations is the best indicator that a new stubstance has been formed?

• A solid has become a liquid.

• A substance has change color.

• A solid has dissolved in a liquid.

• The volume of a substance increased.

Tags

NGSS.MS-PS1-2

The table records the observations that result from four different combinations.

Which combination of substances shows evidence that a new substance was formed?

• Baking soda and vinegar

• Sodium chloride and water

• Oil and water

• Iron filings and sand

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5