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by BlastRoom
Decide whether evidence shows a physical or chemical change in matter.
#us_grade_7_science
40 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
Answer to place stones and capture territory.
Outrun the snow together.
Earn blasts, then hunt the other team.
Answer to earn energy, then climb.
The class blasts through walls together.
Bid on mystery lots. Most money wins.
Sell tours. Nice, standard, or a total scam.
Answer, restock, and serve the rush.
More correct answers pulls the rope your way.
Answer, then shoot down the alien wave.
Answer, then tap to leap the frozen ridge.
A strip of magnesium burns with bright white light and leaves a white powder with different properties. What kind of change happened?
A student tears a sheet of aluminum foil into smaller pieces, and each piece is still shiny aluminum. What kind of change is shown?
Vinegar and baking soda are mixed in a cup, and the mixture foams with bubbles. Which observation supports a chemical change?
Ice melts in a beaker at 20 degrees Celsius, and the liquid is still H2O. What evidence shows a physical change?
Iron wool is left in damp air and becomes reddish-brown rust. The rust has different properties from iron. How should this change be classified?
Sugar dissolves completely in warm water, and no gas, heat, light, or new solid appears. The sugar can be recovered by evaporating water. What change happened?
When two clear solutions are combined, a cloudy yellow solid appears at the bottom. What evidence points to a chemical change?
A copper wire is bent into a coil, but it remains copper and keeps its metallic color. What evidence shows this is a physical change?
A candle wick burns, giving off light, heat, and gases while black soot appears. What kind of change happens in the burning wick?
A glass rod is snapped into two shorter pieces, and the pieces are still glass. Which classification best matches the evidence?
In a sealed bag, calcium chloride is mixed with baking soda solution. Which observation would be evidence that a chemical reaction occurred?
A block of dry ice changes directly into carbon dioxide gas without becoming a liquid. What evidence shows a physical change?
Milk turns sour after sitting warm, and it smells different because new substances form. How should this change be classified?
A student grinds a salt crystal into powder. The grains are smaller, but they still taste salty and dissolve like salt. What change happened?
A clean silver spoon slowly darkens as tarnish forms on its surface. What observation is evidence of a chemical change?
Liquid water freezes into ice in a tray. What evidence supports a physical change?
A raw egg turns firm and white while cooking, and it cannot return to its raw form. What kind of change happened?
A student mixes sand and iron filings, then separates them with a magnet. No new substance appears. Which claim fits the evidence?
Yeast is added to sugar water, and the balloon on the flask inflates as carbon dioxide forms. What observation is chemical-change evidence?
A lump of clay is molded into a bowl. What evidence shows a physical change?
A piece of paper burns and becomes ash, smoke, heat, and light. What classification is supported by the evidence?
Chocolate softens and melts in a warm hand, then hardens again in a cool room. What kind of change is this?
Two liquids are mixed in a beaker that is not heated. A student records four observations. Which one is evidence of a chemical change?
A pencil is sharpened, producing wood shavings and a pointed tip. What evidence supports a physical change?
A tablet dropped into water fizzes until it disappears, producing carbon dioxide gas and dissolved products. What kind of change occurred?
A rubber band is stretched and then returns to its original length. No color change, gas, or new solid appears. How is this change classified?
A copper roof slowly turns from metallic brown to blue-green after years in air and rain. What evidence indicates a chemical change?
A fruit smoothie is made by blending strawberries and yogurt. The pieces get smaller and mixed. What evidence shows a physical change?
Hydrogen peroxide is poured on a cut potato, and it bubbles as it breaks down. Which evidence supports a chemical change?
A metal spoon is warmed in hot water, but it remains the same metal and no new substance forms. What evidence shows a physical change?
Bread dough rises as yeast makes carbon dioxide bubbles and new alcohol molecules. What kind of change is occurring in the dough?
A rock is broken into gravel by a hammer. The pieces have the same mineral properties as the original rock. What kind of change happened?
Steel wool is placed in vinegar, then exposed to air; it warms and rusts. What evidence best supports a chemical change?
A glass of water evaporates from a windowsill, leaving no residue. What evidence shows a physical change?
A banana peel turns brown as it reacts with oxygen in air. New brown substances form. What classification is supported?
A student separates a mixture of saltwater by evaporating the water and collecting salt crystals. What kind of change occurred?
Lemon juice is added to purple cabbage indicator. Which observation would be evidence of a chemical change?
A steel can is crushed flat for recycling, and it remains steel. What evidence shows this is a physical change?
A glow stick is bent so two liquids inside mix, and it starts to glow with no flame or heat source. What kind of change is happening?
A sheet of paper is folded into an airplane, then unfolded. What evidence supports a physical change?
Crack the passcode before the zombies get in.
Answer, then swat bugs for bonus points.
Race through questions at your own speed.
Same question on every screen. Fastest wins.
Pick a tile, answer, hit bonuses and steals.
Conservation of Mass
20 questions
