Signs of a Chemical Reaction

What is the indication of a chemical reaction when there is a change in color?

• The indication of a chemical reaction when there is a change in color is a psychological change.

• The indication of a chemical reaction when there is a change in color is a chemical change.

• The indication of a chemical reaction when there is a change in color is a physical change.

• The indication of a chemical reaction when there is a change in color is a biological change.

Tags

NGSS.MS-PS1-2

What is the term used to describe the indication of a chemical reaction when a precipitate is formed?

• Evaporation reaction

• Sublimation reaction

• Precipitation reaction

• Condensation reaction

When a chemical reaction results in a change in color, what is this indication called?

• The indication is called a smell change.

• The indication is called a texture change.

• The indication is called a temperature change.

• The indication is called a color change.

Which one of these is not a sign of a chemical reaction?

• precipitate formed

• odor produced

• color change by adding food dye

• gas bubbles formed

Tags

NGSS.MS-PS1-2

Which of these signs occurs when a nail begins to rust?

• temperature change

• odor produced

• precipitate formed

• bubbles formed

Tags

NGSS.MS-PS1-2

True or false: there has to be more than one sign of a chemical reaction for it to be a chemical reaction.

• True

• False

Tags

NGSS.MS-PS1-2

The production of carbon dioxide gas when baking soda and vinegar reacted indicated a _____________.

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Students were working in the lab and they mixed 2 substances together and a substance forms at the bottom of the test tube , what is the sign they have observed?

• Change in Temperature

• Solid Formation

  (Precipitate)

• Change in Color

• Bubbles formation

Tags

NGSS.MS-PS1-2

check the data table and determine if there is a chemical change and how did you know?

• No, nothing has changed. the substance remained the same

• Yes, the color and odor changed which indicate a chemical change

• Yes, but there is non substance has formed

• No, there is new substance

Tags

NGSS.MS-PS1-2

A student added white crystals to a clear liquid. The crystals dissolved in the liquid. After a few seconds, the liquid became quite warm and then turned bright red in color. Indications that a chemical change was taking place could be observed when –

• the white crystals were added to the clear liquid.

• the crystals dissolved in the liquid leaving only the liquid visible

• There are no indications of chemical change

• the temperature of the liquid increased and an unexpected color change occurred.

Tags

NGSS.MS-PS1-2