How do you know when a chemical reaction occurs?

Answer 1

Many different things show that a chemical reaction is happening.

the main one is CHANGE IS OCCURING. change of colour, change of amounts, etc. Also, heat is being consumed/given off. light is given off. Gasses are prodiced. etc etc. some chemical reactions are easily seen i.e. mushroom cloud in the sky, water boils when added to h2so4. other chemical reactions are only realized when a different product emerges from the combining of different elements

Answer 2

The ways you can tell that a chemical reaction has taken place include a change in temperature, a change in color, a change in odor, the formation of a solid (precipitate), and the formation of a gas.

Answer 3

A chemical reaction occurs when there is a change in chemical composition, resulting in the formation of new substances with different properties. Signs of a chemical reaction include a change in color, formation of gas or precipitate, release or absorption of heat, or a change in odor. Physical changes like melting, freezing, or dissolving are not considered chemical reactions.

Answer 4

Some chemical reactions are indiscernable; others are unmistakable. Some of the criteria are:

- change in color

- change/presence of smell

- change in temperature (up or down)

- presence of bubbles

- formation of a precipitate (solid)

- change of the viscosity

- change of general appearance

- possible explosion

- possible chemiluminiscence

A chemical reaction may feature any, all, or none of these observations. Chemically speaking, a chemical reaction occurs when a new substance is formed that wasn't there before.

Answer 5

Signs of chemical reactions may be:

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Gas release

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Formation of a precipitate

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Change of color

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Change of odor

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Change of pH

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Change of aspect

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Change of viscosity

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Change of the temperature

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Visible formation of new compounds

Answer 6

When reactants disappear or alter their properties, and new product are formed, with new, different properties.

Some indicators, showing that a chemical reaction is taking place in solution, are color change, formation of a solid from two solutions, formation of a gas (observed as bubbling).

Answer 7

you may see a new substance being created,a change or peak of energy occurs,change in appearence,tempature change,precipitate,and color change.

Answer 8

there are a number of observable signs: color change, solids form when liquids are mixed, bubbles of a gas are produced, etc

Answer 9

An increase or decrease in temperature, production of gases, and often a change in color are all possible signs of a chemical reaction!

Answer 10

If the color changes