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What are two types of qualitative observations in chemistry?
Two types of qualitative observations in chemistry are color changes and precipitate formation. These observations do not involve numerical measurements but rely on characteristics such as color or appearance. They are useful in indicating chemical reactions or changes in a substance.
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
A change in matter that produces new substances is called?
Chemical change. References: Intro to Matter book.
Is shortening melting a chemical change or chemical property?
Shortening melting is a physical change, not a chemical change or chemical property. When shortening melts, it undergoes a change in state from solid to liquid without any change in its chemical composition.
When a substance undergoes a phase change what occurs a particle change a chemical change a new substance is formed a physical change?
During a phase change, the substance transitions between different states of matter (solid, liquid, gas) without any change in the chemical composition of the particles involved. This means that there is no new substance formed and no chemical change taking place, it is solely a physical change.
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 are two types of qualitative observations in chemistry?
Two types of qualitative observations in chemistry are color changes and precipitate formation. These observations do not involve numerical measurements but rely on characteristics such as color or appearance. They are useful in indicating chemical reactions or changes in a substance.
What observations give evidence that chemical reaction has happen?
No
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.
Prediction need to change when?
observations change
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.
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?
Change of state does not necessarily indicate a chemical change. It could be a physical change, such as melting or freezing, where the substance remains the same chemically. On the other hand, the formation of a precipitate, absorption of energy, and release of a gas are all indicators that a chemical change has occurred.
