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by BlastRoom
Sort everyday matter into pure substances, homogeneous mixtures, and heterogeneous mixtures.
#us_grade_7_science
20 questions
One question set, multiple game modes. Tap any game to see it in action. Not sure which to pick?
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A glass of salt water looks the same throughout after all the salt dissolves. How should this sample be classified?
A snack bag contains visible pretzels, raisins, and peanuts. How should this sample be classified?
A bottle contains distilled water made only of H2O molecules. How should this sample be classified?
A sheet of aluminum foil is made only of aluminum atoms. How should this sample be classified?
Clean air contains nitrogen, oxygen, and argon gases spread evenly so it looks the same everywhere. How should clean air be classified?
A piece of granite shows separate pink, black, and clear mineral crystals. How should this sample be classified?
A cartridge contains carbon dioxide gas made only of CO2 molecules. How should this sample be classified?
A brass key is made of copper and zinc atoms blended evenly, with no separate pieces visible. How should the brass be classified?
A particle diagram shows one kind of single atom repeated throughout the box, with no bonded particles. What does the diagram show?
A particle diagram shows identical particles, each made of two orange atoms and two dark atoms bonded together, and no other particles. What does it show?
A particle diagram shows two kinds of unbonded particles evenly spread through the same box. What does the diagram show?
A particle diagram shows blue particles clumped on the left and yellow particles clumped on the right. What does the diagram show?
A particle diagram shows identical molecules, and each molecule has two same-color atoms bonded together. What does the diagram show?
A particle diagram shows orange molecules and gray molecules mixed together, and no orange molecule is bonded to a gray one. Why is this sample a mixture and not a compound?
A bowl contains sand and iron filings. A magnet removes the filings while the sand stays behind. Which explanation fits the evidence?
Sugar is stirred into water until no grains are visible, and every sip tastes equally sweet. Which explanation fits the evidence?
A copper wire is made only of copper atoms and has the chemical symbol Cu. Which explanation fits the sample?
Pure table salt from a mine and pure table salt made from seawater both have one sodium atom for every chlorine atom. What does this show?
A jar of muddy pond water settles into a mud layer with clearer water above it. Which explanation fits the evidence?
Rubbing alcohol can contain isopropyl alcohol and water uniformly mixed, and the percentages can vary by brand. Which explanation fits?
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20 questions
