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Color Change
Heat
Precipitate
Odor
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∙ 12y ago
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Which are 4 indications of chemical reaction has occurred?
The indicators of a chemical reaction are :- 1. Change in colour 2. Change in temperature 3. Evolution of a gas 4. Formation of a precipitate
Is peeling an apple a physical or chemical change?
it is a chemical change
When a substance undergoes a phase change what occurs a particle change a chemical change a new substance is formed a physical change?
When a substance changes phase, this is a physical changerather than a chemical change. When water freezes to become ice, or when ice melts to become water, its all physical.
Is Cleaning a painted surface with acid a chemical or physical change?
Chemical broooooooooooooooo niga
Is extraction a physical or chemical change?
No. A physical change is a change that does not change the chemical composition of a substance, while a chemical change does change the chemical composition of a substance.
What observations give that a chemical reaction has happened?
is the colour change, tempeture change ,gas produced the most common ones
What observations give evidence that a chemical reactions has happened?
is the colour change, tempeture change ,gas produced the most common ones
How is a student able to conclude that a chemical reaction occurred?
Some observations: - change of colour - formation of a precipitate - change of odor - change of temperature - release of a gas - change of pH - change of viscosity etc.
What are the five observations of chemistry that shows that a chemical reaction have taken place?
Formation of a precipitate; change in color; change in temperature; formation of a gas; emission of light.
What observations does not indicate that a chemical change has occurred a. change of state b. formation of a precipitate c. absorption of energy d. release of a gas?
acually the answer depends on the nature of chemical reaction under consideration and depending on the reaction, there are two possible answers: a change of state and absorption of energy.
What observations give evidence that chemical reaction has happen?
No
Prediction need to change when?
observations change
Which are 4 indications of chemical reaction has occurred?
The indicators of a chemical reaction are :- 1. Change in colour 2. Change in temperature 3. Evolution of a gas 4. Formation of a precipitate
What 4 factors determine a chemical change?
heating is one of them
When a kettle is boiled you can tell it is not chemical change?
There are 4 evidences of a chemical reaction : -Change of colour. -Formation of precipitate. -Release of energy. -Effervescence.
What can be used to describe a chemical change?
A chemical equation can be used to describe a chemical change. For instance when iron combines with oxygen to form iron (III) oxide (rust), a chemical change has occurred. It can be written as a chemical formula: 4 Fe + 3 O2 --> 2 Fe2O3
Is burning a fire a physical or chemical change?
Burning is a chemical change.
