5th Grade Science : 5th Grade Science
Study concepts, example questions & explanations for 5th Grade Science
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Example Questions
Example Question #1 : Conservation Of Matter
Will the mass change when reactants combine to form products in a chemical reaction? Why?
There is no way to know what will happen to the mass of the substances without exact data.
No; The combined mass of the newly formed and existing substances will stay the same.
Yes; A new substance is bring formed, so the mass will increase.
No; The combined mass of the newly formed and existing substances will stay the same.
The total mass should be the same as the sum of the individual masses recorded before the contents were combined, and the reaction took place. The reactants have been transformed into a new substance, but that all the individual atoms making up the reactants are still present in the products. That’s why the mass stays the same. The Law of Conservation of Matter says that matter remains the same, even when matter changes form. Sometimes it may seem that matter disappears during a science experiment, but this law tells us that matter cannot magically appear or disappear; it merely changes from one form to another.
Example Question #5 : Measure And Graph Evidence Of Matter Being Conserved
Danielle's class was investigating the Law of Conservation of Matter in science today. They found the mass of a piece of construction paper and then ripped it in half, into quarters, and then eighths. They found the mass at each stage and recorded it on the graph below.
True or False: The mass of the paper was conserved throughout the investigation.
False
True
True
The mass of the paper was conserved throughout the investigation because of the conservation of matter. Even though the paper was ripped, the amount of matter (mass) stayed the same. The Law of Conservation of Matter says that matter remains the same, even when matter changes form. Sometimes it may seem that matter disappears during a science experiment, but this law tells us that matter cannot magically appear or disappear; it merely changes from one form to another.
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