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There Are Actually Four.
Combustion: Rapid Combination Of A Fuel With Oxygen; Produces Heat, Light, And New Substances. Ex:Gas. Oil, Or Coal Burning In A Furnace.
Electrolysis: Use Of Electricity To Break A Compound Into Elements Or Simpler Compounds. Ex: Breaking Down Water Into Hydrogen And Oxygen.
Oxidation: Slow Combination Of A Substance With Oxygen. Ex: Rusting Of An Iron Fence.
Tarnishing: Slow Combination Of A Bright Metal With Sulfur Or Another Substance, Producing A Dark Coating On The Metal. Ex:Tarnishing Of Brass.
I Got This Answer From The 4th Grade Science Book Of Douglass Named
"California Physical Science"
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∙ 13y ago
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What are the five indications of chemical reactions?
color change release gas release heat form a whole new substance precipitation
Is it true or false that indications of a chemical change include light heat and gas production?
True. Chemical changes can vary from colour change to gas production.
List 5 indications of a chemical change?
If an object has changed its chemical composition it has been through a chemical change. If you can't reverse what has been done in any way (things like burning, mixing, rusting) it's a chemical change
What clues can you use to identify a chemical change?
Characteristics of a chemical change can include a temperature change, a color change, the production of bubbles, the production of a precipitate, and a smell.
How can a chemical reaction be observed?
Some indications may be: - release of a gas - formation of a precipitate - change of color - change of odor - change of pH - change of viscosity - change of the aspect - etc.
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 are the 5 indications of a chemical change?
1. releasing of heat 2. change of color 3. bubbling 4. change of smell 5. precipitation
What are three things that are often indications of chemical changes?
Chemical changes can be identified by 1. Color change 2. Fizzing 3. Temperature changes 4. Odor changes 5. Change in the state of matter (solid, liquid, gas)
What are some clear indications that a chemical reaction took place when two or more chemicals are combined?
Formation of a solid, formation of a gas, usually, but not always, change in temperature. Change in properties of the reactants.
What are five opposites of chemical change?
1. Hi 2. Bye
A change in color is evidence of a change?
yes **Why? I need more than just yes. Tell why.** ok ok ok its not always a sign that there is a reaction but in most cases it will be. things that show a reaction are temperature change (usually increase but not always) mass change, state change or physical change. hope this helps
What information is given by the group number of an element?
Indications about the general chemical properties of this element.
