Post a New Question

10th grade

posted by .

i neeed help determining whether the following changes are chemical or physical and why. i have some guesses but i wanted to have them verified. thanks. =)
1) mixing chalk and vinegar: chem. b/c it bubbles
2) mixing starch and iodine: physical b/c the iodine dissoles and the satrch falls to the bottom of the beaker, (but the mixture turns purple)
3) ammonia abd iron (III) chloride: physical b/c the mixture eventually settles out,(but there is a color change.)
please help me to verify. thanks

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. year 7 science

    Chemical and physical changes. please could someone help me i need to say whether the following are chemical or physical changes and explain why. I`ve looked myself but i can`t find anything that helps. grateful for any help .thanks …
  2. Changes in Matter

    Which of the following kitchen activities are physical changes, and which are chemical changes?
  3. Changes in Matter

    Which of the following everyday activities are physical changes, and which are chemical changes?
  4. Changes in Matter

    Which of the following geological changes are physical changes and which are chemical changes?
  5. Chem Lab

    Am I right? Classify the following properties of sodium metal as physical or chemical: •Silver metallic color—physical property •Turns gray in air—physical property •Melts at 98º C-melting point is physical property •Reacts
  6. chem

    I need help classifying these as physical or chemical changes! 1. sodium metal exposed to air turns dark gray. 2. steam in a test tube condenses to moisture. 3. baking soda in vinegar releases bubbles. 4. water dissolves in vinegar …
  7. Science

    Are the following examples physical changes or chemical changes. Mixing yeast and sugar Dissolving sugar in water Slicing bread Baking bread Melting cheese
  8. A lev chem

    Comment on the solubility of iodine (I2) in each of the following liquids. State whether at room temperature you expect I2 to be highly soluble or almost insoluble, and choose the appropriate reasons why. HINT: It may behoove you to …
  9. Chemistry - acids & bases

    4. Calculate the pH of each of the solutions and the change in pH to 0.01 pH units caused by adding 10.0 mL of 2.37-M HCl to 320. mL of each of the following solutions. Change is defined as final minus initial, so if the pH drops upon …
  10. Chemistry

    Use the concentrations and volumes of hydrogen peroxide and KI before mixing (Table 1), calculate the post-mixing concentrations. Before mixing: [H2O2] = 0.88M [KI] = 0.500M Table 1: before mixing 1. Vol H2O2 = 4.0 mL, [H2O2] = 0.88M …

More Similar Questions

Post a New Question