oxygen oxygen is a mean of oil & baking soda can react chemically with vinegar producing carbon dioxide ->  baking soda can react chemically with vinegar producing a gas  vinegar is a kind of substance & cold milk is a mean of report -> combining baking soda and vinegar is combining two substance together combining baking soda and vinegar is combining two substance together  baking soda can react chemically with vinegar producing a gas & combining baking soda and vinegar is combining two substance together -> animalia cold milk and oil can effect physical hours combining baking soda and vinegar can cause chemical reactions  combining baking soda and vinegar can cause chemical reactions & oil is added into cold milk -> vinegar being added into baking soda will cause chemical reactions