Our hypothesis is the same and we both agree that we believed the bath bomb will dissolve better and have a better reaction in hot water we also believe that the bath bomb will have a less reaction and slower reaction in cold water and will take a longer time to dissolve than warmer/hotter water .We think this because particles tend to move faster in higher temperatures.

Bath bombs work/fizz because of an acid-base reaction.Two of the key ingredients to bath bombs that make them so fizzy are citric acid and sodium bicarbonate(baking soda).The baking soda(sodium bicarbonate)  breaks apart when it is put into the water .At the same time the citric acid also breaks apart in the water and releases hydrogen(H) .When the bicarbonate and citric acid meet,they react with each other this reaction makes carbon dioxide (Co2)this forms tiny bubbles that rise to the top creating the fun fizz and bubbling effect.Bath bombs only react in water because water allows the acid(citric acid) and base(baking soda) to move around,dissolve and touch each other,Without the water they particles cannot move enough to react.Ever wondered why bath bombs don't dissolve fast in cold water but do in hot water? This is because according to collision theory has the temperature of the water rises the particles move faster and faster! The molecules in cold water move very slow which is why it takes so long for bath bombs to dissolve. When the bath bomb submerged in the water the water acts has a solvent allowing the citric acid to release hydrogen ions. These ions react with the bicarbonate to produce carbon dioxide gas which creates that “fizzing” effect.

Independent variable: One thing that changed in the experiment was the structure of the bath bomb,this happened because the baking soda and citric acid break down. Controlled variable: Was the colour of the bath bomb and the temperature of the water.The colour stayed the same because since the bath bombs are coloured with dyed they chemically stable because they don't react to the citric acid and baking soda.

Supplies: 3 Glass bowls,thermometers, homemade bath bombs and a stopwatch. First we have need three separate clear bowls/tank temperatures cold warm and hot . Place bath bomb one a time and we time , reaction and record our results then repeat to the rest of the bath bombs in the different temperatures of hot,room temperature and cold .

• Ingredients:
• 2 cups of baking soda
• Canola oil
• Epson salt 
• Food dye 
• Citric acid

For this experiment we are going to be testing how  how bath bombs dissolve in different temperatures of water and why? We will also time and record how long it takes to dissolve in the different temperatures of water,Cold, room temperature,Hot.

Collision theory is a chemical reaction of particles physically smashing into each other. Bath Bombs are a perfect example of collision theory because when the bath bombs are in a dry state the citric acid and bath bombs are tightly packed together and cannot react because the particles are locked in place. When the bath bomb touches the water the ingredients dissolve in the water.

The results of this experiment has taught us that the reaction rate of a bath bomb is directly proportional to the temperature of water .This means that when the temperature of the water rises the bath bomb dissolves faster.According to collision theory higher temperatures provide citric acid and sodium particles with more kinetic energy. In conclusion this experiment shows that temperature of the water is important when determining the reaction rate a bath bomb.

Bath bombs use moisturizing ingredients like coconut oil and hydrate dry skin.primary use can be enhanced bathing and skincare.Most bath bombs including ours include Epsom salt which can help ease muscle tension and reduce inflammation maybe after a workout.Also lavender or other infused bombs can be used to reduce stress and improve your mood by filling the space with soothing scents and it can be an extra freshener for a more fresh like clean scent .

• In our sources in error we experienced error and didnt stop on time but we fixed that mistake by timing it again.
• The hot water had also cooled down a bit so we had to fill up our water again.

Most of our research came from these following sources - https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p105/chemistry/bath-bomb-science   https://www.fleetscience.org/blog/2019/08/anatomy-bath-bomb 

We would like to thank Mrs.Pepper for her knowledge,empathy and positive energy. We would also like to thank our friends and family for supporting us in the creation of the this science fair project.