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by BlastRoom
Classify changes in matter and identify evidence that a new substance formed.
#chemistry
40 questions
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The photo shows reddish-brown material forming on an iron nail. How should this change be classified?
In the photo, an ice cube is turning to liquid water on a warm plate. What kind of change is occurring?
The photo shows milk becoming lumpy after lemon juice is added. Which classification fits best?
A candle wick is burning with a flame and melted wax nearby. What is the main change at the flame?
The photo shows sugar crystals disappearing as they are stirred into water. How is this change classified?
The photo shows a sheet of paper being torn into smaller pieces. Which type of change is shown?
The photo shows a raw egg turning opaque and solid in a hot pan. What type of change is this?
The photo shows green material forming on the outside of a copper pipe. Which classification is most accurate?
The photo shows water bubbling as it is heated in a glass beaker. What kind of change is it?
The photo shows a tablet fizzing after it is dropped into water. How should the fizzing process be classified?
Solid iodine is warmed and purple vapor appears. What type of change occurred?
A strip of magnesium burns with a bright white light and leaves a white powder. How is the change classified?
Sand is removed from a sand-water mixture by pouring it through filter paper. What kind of change is this?
A silver spoon slowly turns dark when exposed to sulfur compounds in air. What type of change is this?
A student grinds a cube of salt into a fine powder. Which classification is correct?
Baking soda and vinegar are mixed, and bubbles rapidly form. What type of change is occurring?
Liquid bromine is cooled until it becomes a solid. How should this be classified?
When solutions of CaCl2 and Na2CO3 are mixed, solid CaCO3 appears. What type of change is this?
Wet clothes dry on a line as liquid water leaves the fabric. What type of change happens to the water?
Hydrogen peroxide breaks down into water and oxygen gas when a catalyst is added. How is this classified?
A copper wire is stretched into a thinner wire. Which classification fits?
A piece of zinc is placed in hydrochloric acid, and hydrogen gas bubbles form as zinc chloride stays in solution. What type of change is this?
Blue food coloring spreads evenly through water after stirring. What kind of change is this?
A cake batter is baked and becomes a fluffy solid that cannot be changed back into batter by cooling. How is this classified?
Two clear solutions are mixed, and the beaker becomes cloudy as a white solid appears. Which observation is evidence of a chemical reaction?
A sealed bag gets colder when two chemicals inside are mixed. Which observation best suggests a chemical reaction?
A strip of metal is placed in acid, and bubbles collect on the metal surface. Which observation points to a reaction?
A reaction mixture glows and gives off heat after two solids are pressed together. Which observation is evidence of chemical change?
When bleach is added to a colored dye solution, the color disappears and the dye cannot be recovered by evaporation. Which observation supports a chemical reaction?
A student mixes two liquids and notices a sharp new odor that neither liquid had before. Which observation is evidence of a new substance?
Copper metal is placed in a silver nitrate solution, and gray crystals grow on the copper. Which observation is chemical evidence?
A sample is heated, and a gas is produced while a new black solid remains. Which observation best shows a chemical reaction?
Clear solutions of lead(II) nitrate and potassium iodide are mixed in a test tube. Which observation shows that a reaction occurred?
A white solid is heated, and a glowing splint placed in the gas it gives off bursts into flame. What does this test show?
A copper wire is cut into short pieces. Why is this classified as a physical change?
Iron wool rusts after sitting in moist air. Why is this a chemical change?
Salt water is boiled until only salt crystals remain. Why is this separation a physical change?
A log burns in a fireplace and leaves ash. Why is this classified as a chemical change?
Water freezes in an ice tray. Why is this a physical change?
Solutions of Pb(NO3)2 and KI are mixed, producing solid PbI2. Why is the classification chemical?
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Evidence a Chemical Reaction Happened
15 questions
