STEP ONE: You are given a bottle of Dye X and three bottles containing clear liquids as shown. Solution I and II contain chemicals dissolved in water, but you do not know what these chemicals are; this is why they are labeled “unknown.” Question: Which of the samples represents the control group and which represents the experimental samples?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate

Which of the following is a physical change? a. burning a piece of wood b. sawing a piece of wood in half c. rust forming on an iron fence d. a copper roof changing color from orange to green