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by BlastRoom
Identify observable signs that new substances formed during a chemical reaction.
#chemistry
15 questions
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Vinegar is added to baking soda in a cup, and bubbling begins immediately. Which observation is evidence that a chemical reaction occurred?
Two clear solutions are poured together, and a bright yellow solid appears in the liquid. Which observation is the reaction evidence?
A strip of magnesium is placed in acid. The thermometer reading changes from 22°C to 34°C while the mixture reacts. Which observation shows reaction evidence?
A pad of damp steel wool is left in air for several days. Which observation would show that a chemical reaction happened?
Calcium chloride solution is mixed with sodium carbonate solution, and the mixture turns cloudy white. Which observation is the best evidence of reaction?
Which observation gives the strongest evidence that a new substance formed?
A student records four lab observations. Which one is evidence of a chemical reaction rather than only a physical change?
Which lab note does NOT by itself show evidence of a chemical reaction?
Which observation is the weakest evidence that a chemical reaction occurred?
Two colorless solutions are mixed. The temperature rises by 8°C and a white solid appears. What is the best conclusion?
A zinc strip is placed in blue copper sulfate solution. The blue color fades, a reddish coating forms on the strip, and the beaker warms. What is the best conclusion?
A dry white powder is heated in a test tube. A gas inflates a small balloon, and the remaining solid is yellow after cooling. What conclusion fits the observations?
A student mixes two clear salt solutions and wants evidence that a new product formed. Which additional observation would best support that claim?
A student heats a dry white powder and wants more evidence it changed chemically. Which added observation would best support the claim?
A metal strip is placed in a colorless solution. Which extra observation would best support that a chemical reaction occurred?
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Atomic Number, Mass Number and Symbol Notation
40 questions
