Problem: Which changes are evidence of a chemical reaction? A beaker of water becomes cool to the touch upon adding a salt to it. A cloudy solution becomes clear upon adding another solution to it. Bubble formation on chalk added to acid Water condensing Bubbles forming in a shaken water bottle

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For this problem, we have to analyze each statement if it is evidence of a chemical reaction or not

A beaker of water becomes cool to the touch upon adding a salt to it 

  • Dissolution of salts is usually a physical reaction since ions are being formed from ionic compounds, no chemical reaction occurs

This is not evidence of a chemical reaction

A cloudy solution becomes clear upon adding another solution to it. 

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Problem Details

Which changes are evidence of a chemical reaction? 

A beaker of water becomes cool to the touch upon adding a salt to it. 

A cloudy solution becomes clear upon adding another solution to it. 

Bubble formation on chalk added to acid 

Water condensing 

Bubbles forming in a shaken water bottle

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Our tutors have indicated that to solve this problem you will need to apply the Physical & Chemical Changes concept. You can view video lessons to learn Physical & Chemical Changes. Or if you need more Physical & Chemical Changes practice, you can also practice Physical & Chemical Changes practice problems.