oxygen oxygen is a mean of oil & cold milk can react chemically with oil producing oxygen oxygen ->  baking soda can react chemically with vinegar producing a gas  oil is a mean of prey & cold milk is a mean of report ->  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 ->  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