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Chemical Reactions. … Reactions occur when two or more molecules interact and the molecules change. Bonds between atoms are broken and created to form new molecules. That’s it.
Contents
- 1 What are common chemical reactions?
- 2 Which observation would provide the best evidence that a chemical reaction occurred?
- 3 In which case does a chemical change occur?
- 4 What changes are observed during chemical change Write 4 points?
- 5 What are the changes which occurred to the materials?
- 6 What changes may happen in a physical change?
- 7 What are the substance that cause or start chemical reaction?
- 8 What observations might indicate that a chemical change has occurred quizlet?
- 9 Which information can you determine about a chemical reaction from a complete chemical equation?
- 10 Which observations show that a change in state of matter has occurred?
- 11 How do you classify chemical reactions?
What are common chemical reactions?
The five basic types of chemical reactions are combination decomposition single-replacement double-replacement and combustion.
Which observation would provide the best evidence that a chemical reaction occurred?
Change of odor. Change of color (for example silver to reddish-brown when iron rusts). Change in temperature or energy such as the production (exothermic) or loss (endothermic) of heat. Change of composition – paper turning to ash when burned.
In which case does a chemical change occur?
Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point color taste etc) is turned into a different substance with different properties.
What changes are observed during chemical change Write 4 points?
Ans: Chemical transition conditions: colour change precipitate formation gas formation smell change change in temperature. 4.
What are the changes which occurred to the materials?
A physical change is a change in the form or physical properties of a substance but not in its chemical composition. For example processes of evaporation condensation solidification melting wetting and drying change the form of a substance. Heating and cooling change the temperature of a substance.
What changes may happen in a physical change?
Physical changes involve states of matter and energy. No new substance is created during a physical change although the matter takes a different form. The size shape and color of matter may change. Physical changes occur when substances are mixed but don’t chemically react.
What are the substance that cause or start chemical reaction?
reactantsThe substance (or substances) initially involved in a chemical reaction are called reactants or reagents.
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What observations might indicate that a chemical change has occurred quizlet?
What observations might indicate that a chemical change has occurred? change in color the production of a gas and the formation of a precipitate. a substance reacts and forms one or more new substances.
Which information can you determine about a chemical reaction from a complete chemical equation?
A chemical equation can show if special conditions are required for a reaction to take place such as adding heat or using a catalyst. And if the equation is balanced: The coefficient numbers in the equation show the number of molecules formula units or atoms of the species involved in the reaction.
Which observations show that a change in state of matter has occurred?
Observations that indicate a chemical change has occurred include color change temperature change light given off formation of bubbles formation of a precipitate etc.
How do you classify chemical reactions?
Classifying Chemical Reactions
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