10) Why is it important to keep control variables the same?
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baam
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4) After reacting hydrochloric acid with sodium hydroxide, the temperature has increased from 21ËC to 52ËC. This reaction is
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6) Which is the best scientific question for investigating fuels?
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sodium peroxide symbol
Na2O2
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Word chemical equation Magnesium reacts with oxygen
magnesium + oxygen-> magnesium oxide
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7) In an investigation comparing fuels, what is the independent variable?
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True& false Some metals react with oxygen to make oxides.
True
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The flare includes .........................., which makes a red flame.
strontium nitrate
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3) A grade 7 student wants to know if the reaction of hydrochloric acid and sodium hydroxide solution is exothermic or endothermic. He did an experiment for this reaction. Give the name of this reaction:
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9) Which of the following should be kept as a control variable?
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True& false Magnesium is more reactive than Sodium
False
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1) Which statement best describes an exothermic reaction?
