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The MOST OBVIOUS indicator a chemical reaction occurred is: A gas was formed.
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An indicator that a chemical reaction has taken place is: Heat is given off after mixing two substances.
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The following is a physical change: Melting.
Betty placed an unknown powder in a zip lock bag. When she added water to the bag, the powder bubbled, and it disappeared. When the bubbling stopped, the bag contained a clear liquid and a lot of gas.
What is the MOST OBVIOUS indicator a chemical reaction occurred?
(1 point)
Responses
The powder mixed with the water.
The powder mixed with the water.
The powder changed color.
The powder changed color.
A gas was formed.
A gas was formed.
There was a change in temperature.
There are several different indicators that a chemical change has taken place. Which of the following examples would be considered an indicator that a chemical reaction has taken place?(1 point)
Responses
Heat is given off after mixing two substances
Heat is given off after mixing two substances
The shape of paper changes as it is cut
The shape of paper changes as it is cut
A liquid freezes
A liquid freezes
A Substance has dissolved
Which of the following is a physical change?(1 point)
Responses
Burning
Burning
Rusting
Rusting
Melting
Melting
Decomposing
1 answer