TCBOE Science 8 Post Test 2025

Front

Which equation is a balanced chemical equation? Options: 2NaOH + CaBr₂ → Ca(OH)₂ + NaBr, NO + Cl₂ → NOCl, CaCO₃ → CaO + 2CO₂, 2AlCl₃ + 3Mg → 3MgCl₂ + 2Al

Back

2AlCl₃ + 3Mg → 3MgCl₂ + 2Al

Front

What are the products in the chemical reaction below? NaOH + HCl → NaCl + H₂O

Back

sodium chloride and water

Front

Why did the temperature of the sand increase from morning to afternoon when Maria walked on the beach?

Back

The atoms in the sand were moving more quickly.

Front

Which statement best describes the motion of water molecules as the water changes state from steam to liquid?

Back

The molecules move slower and occupy less space.

Front

Order the diagrams from low kinetic energy to high kinetic energy.

Back

II, I, III

Front

Hasheem has four unknown substances. He wants to know which substances are metal. He makes some observations of each substance and records his data in the table.

Back

1 and 3

Front

Based on the data table, which substance has the greatest density?

Back

Substance 4

Front

Which substances are most likely made of the same material? Options: 1 and 3, 1 and 4, 2 and 3, 2 and 4.

Back

1 and 3

Front

Why did the object float in Liquid Y but sink in Liquid X?

Back

Liquid Y is more dense than Liquid X.

Front

During a science lab, the teacher provided Michael with a triple-beam balance, a ruler, and four cube-shaped samples of unknown metals. He correctly calculated the densities of the objects and compared his calculations with the data table shown. Based on Michael’s calculations and the table shown, which conclusion can be best made about the investigation?

Back

Mass per unit volume is used to determine density.