#1
When a substance changes color during a reaction, this is evidence of a chemical change
What is a color change?
When milk spoils and develops a sour smell, this type of evidence of chemical change is observed.
What is an odor change?
When a candle burns and cannot be turned back into wax and wick, this shows that a ______ change has occurred.
What is a chemical change?
When bubbles form during a reaction and it is not boiling, this evidence suggests a new substance is forming.
What is gas production?
Bubbling or fizzing during a reaction is evidence that this is being produced
What is a gas?
When vinegar and baking soda are mixed, the rapid fizzing shows that this substance is being formed.
What is carbon dioxide gas?
When two liquids are mixed and a solid forms, this type of evidence is observed
What is a precipitate (formation of a solid)?
When a reaction causes the temperature to increase or decrease without heating or cooling it externally, this type of change is occurring
What is a temperature change?
When milk spoils and develops a sour smell, this new smell is evidence of this
What is a new substance being formed?
If a reaction becomes hot or cold without being heated or cooled from outside, this type of change has occurred.
What is a temperature change?
When a reaction produces a permanent color change, it is evidence of this type of change
What is a chemical change?
If two clear liquids are mixed and the solution turns bright pink, this visible sign suggests this type of reaction evidence
What is a color change?
Fireworks and glow sticks show this type of evidence of a chemical reaction.
What is light production?
Glow sticks give off light because a reaction is occurring. This production of ________ is evidence of a chemical change.
What is light (or light energy)?
When hand warmers heat up after being exposed to air, this release of energy is evidence of this kind of reaction
What is an exothermic reaction?