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Science thinking · no-sign-up sample

Science sample · Grades 9–12

Five short questions with a real teaching moment. On a phone, move through one clear question at a time.

Question 1 of 5

Chemistry - free strategy

Which equation is balanced?

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Balance atoms before choosing a coefficient

A chemical equation is balanced when each element has the same number of atoms on both sides.

  1. Start with H2 + O2 to make H2O.
  2. Put 2 before H2O to make two oxygen atoms on the right.
  3. Put 2 before H2 to make four hydrogen atoms on each side.

Question 2 of 5

Biology

The process that uses DNA as a template to make mRNA is __.

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Question 3 of 5

Physics

In a closed system, which quantity is conserved during a collision?

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Question 4 of 5

Earth Science

Which gas is the largest human-caused contributor to recent global warming?

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Question 5 of 5

Astronomy

Light from a galaxy shifted toward red wavelengths indicates it is moving __.

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