True& false Magnesium is more reactive than Sodium

10) Why is it important to keep control variables the same?

1) Which statement best describes an exothermic reaction?

sodium peroxide symbol

4) After reacting hydrochloric acid with sodium hydroxide, the temperature has increased from 21˚C to 52˚C. This reaction is

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:

True& false Some metals react with oxygen to make oxides.

9) Which of the following should be kept as a control variable?

6) Which is the best scientific question for investigating fuels?

The flare includes .........................., which makes a red flame.

5) Which process releases heat energy to the surroundings?

7) In an investigation comparing fuels, what is the independent variable?