🧪 Science with Sarah: Conversation heart experiments 💕

You’ll fall in love with these experiments...just in time for Valentine’s Day!

👉 Watch the video of Sarah’s science experiment at Lamar Elementary School here!

Hello parents, teachers and students! Got too many candy hearts for Valentine’s Day? Make a jumbo popsicle stick catapult, and guess which liquid dissolves candy hearts faster!

Be sure to check out GMSA@9 on Wednesdays when Meteorologist Sarah Spivey does the demonstrations and explains the science behind it.

Science with Sarah in partnership with the San Antonio Zoo (Copyright KSAT 2023 - All rights reserved)


  • Candy conversation hearts

Popsicle Stick Catapults

  • 10 jumbo popsicle sticks
  • Rubber bands
  • A plastic bottle cap
  • Glue dots

Melting Candy Hearts

  • Three clear cups
  • Water
  • Soda Water
  • Vinegar


Popsicle Stick Catapults

  • STEP 1: Cut notches on two of the popsicle sticks. It should look like this ⬇️
Cut notches in two of the popsicle sticks (Copyright KSAT 2023 - All rights reserved)
  • STEP 2: Stack the other 8 popsicle sticks onto each other, binding them on both sides with some rubber bands. It should look like this ⬇️
Bind 8 of the popsicle sticks together with rubber bands (Copyright KSAT 2023 - All rights reserved)
  • STEP 3: Shove one of the notched popsicle sticks through the bottom of the stack and place the other notched popsicle stick on top. Bind these two together along the notches. Again, it should look like this ⬇️
Finalized catapult (Copyright KSAT 2023 - All rights reserved)
  • STEP 4: Using a glue dot, place the bottle cap at the top of the catapult. If you’d like to fortify your catapult, place additional rubber bands across the middle of the catapult. Your final product should look like this ⬇️
The finalized catapult (Copyright KSAT 2023 - All rights reserved)
  • STEP 5: Launch the candy conversation hearts from the catapult and see how far you

Melting Candy Hearts

Dissolving Candy Heart Experiment (Copyright KSAT 2024 - All rights reserved)
  • STEP 1: Make a hypothesis about which substance will dissolve candy hearts faster: Water, soda water, or vinegar
  • STEP 2: Pour water, vinegar, and soda water in three separate cups
  • STEP 3: Place 2 candy hearts in each cup and observe over time which dissolves faster. Could take 30 min to an hour.


If you’d like Sarah and David to come to your school and conduct a science experiment live on KSAT, fill out this form. “Winners” are selected at random.

About the Authors

Sarah Spivey is a San Antonio native who grew up watching KSAT. She has been a proud member of the KSAT Weather Authority Team since 2017. Sarah is a Clark High School and Texas A&M University graduate. She previously worked at KTEN News. When Sarah is not busy forecasting, she enjoys hanging out with her husband and cat, and playing music.

Ben Spicer is a digital journalist who works the early morning shift for KSAT.

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