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How can you tell if a reaction has occurred if the temperature or colour changes or the gas has given off?
Wiki User
∙ 6y ago
Signs of chemical reactions may be: - Gas release - Formation of a precipitate - Change of color - Change of odor - Change of pH - Change of aspect - Change of viscosity - Change of the temperature - Visible formation of new compounds - Change of the state of the matter - A violent reaction with explosion or fire - Bubbling - Emitting a sound - Emitting a light
Wiki User
∙ 6y ago
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Describe three changes in appearance which show that a chemical reaction is taking place?
The colour, the temperature and formation of gas
Do visible changes never occur in a reaction mixture?
Of course they do. Some examples are fizzing, when a gas is produced, colour changes, and the formation of precipitates.
How do color changing shirts change color in sunlight?
The shirts contain a thermochromic (temperature sensitive) pigment which changes colour when cold or hot and when the sunlight heats up the pigment, the shirt changes colour.
What is an 'indicator reaction'?
---- indicators are substances which change their colour when treated with acidic or basic solutions this reaction of changing their colour is known as indicator reaction ---- ----
Are indicators changing colour a chemical change?
Any chemical change within any product is due to the ph level that the product carries. Chemical changes occur when you mix one thing with another. Most things you mix together will cause a reaction but it all depends on if the product is an acid or not.
Describe three changes in appearance which show that a chemical reaction is taking place?
The colour, the temperature and formation of gas
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 is an indicator of a chemical reaction?
HEAT, Heat is the the number one indication of a reaction. Also, changes of state of matter and mass are also indicators of a chemical reaction. an example is when an iron fence rusts.
Why are you born with birth marks?
it is a reaction to the skin that changes colour
What observations suggest that a chemical reaction has occurred?
One observation that a chemical change has occurred is the formation of a new product. Another observation is the change in identity and composition of a substance.
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.
List three signs that could make you think a chemical reaction might be taking place?
Some signs that a chemical reaction is taking place is color and temperature changes, and the formation of precipitates.
What is the difference between an equation and a reaction?
it is when the colour of your skin changes to purple and you grow hair everywhere ;)
What are examples that indicate a chemical reaction has occurred?
There are lots of telltale signs, basically any changes that happen to the reaction. For example, this could be a colour change, a mass change as a gas is given off, a pH change, a noise given off, a temperature increase/decrease, fizzing or bubbling.
Do visible changes never occur in a reaction mixture?
Of course they do. Some examples are fizzing, when a gas is produced, colour changes, and the formation of precipitates.
What is the least effective way of dimming tungsten lighting for colour photography?
Rheostat. Dimming by rheostat changes the colour temperature of the light
What evidence do you have that a chemical reaction took place?
changes in its appearance ie colour and state
