Science Mind Challenge

Which of the following best describes a scientific model?

• A machine used to detect tiny particles.

• A set of data collected from observations.

• A tool scientists use to conduct experiments.

• A smaller or simplified version of a real-world object or process.

Why do scientists use models in studying atoms?

• To replace real-world objects.

• To avoid using laboratory equipment.

• Because atoms are too small to see directly.

• Because models are more accurate than experiments.

Which of the following examples shows how a model helps explain a scientific phenomenon?

• A scientist recording data in a notebook.

• A test tube used in a chemistry experiment.

• A telescope used to observe distant stars in the universe.

• A diagram of the water cycle showing evaporation and condensation.

How does a model of the solar system help learners understand how planets move?

• It provides exact data from telescopes.

• It replaces the need for space exploration.

• It shows real-time videos of planetary motion.

• It gives a visual explanation of how planets orbit the sun.

A student claims that a 3D model of a human cell is a better learning tool than a diagram. Which of the following is the best reason to support the student's claim?

• It is commonly used in science fairs.

• It is more colorful and fun to look at.

• It is more expensive and made with better materials.

• It can be touched and rotated to visualize parts in 3D.

Salt is stirred into water and disappears. How can this be explained using particle theory?

• Water pushes salt to the bottom.

• Salt becomes water when stirred.

• Salt particles move into spaces between water particles.

• Salt particles break apart and forms into another particles.

What would best show that particles are always moving?

• Bread rises when cooked in the oven.

• Food coloring slowly spreading in water.

• Ice changes its shape as it is left on a table.

• A gate made of iron rust when exposed to air and water.

A student is given three clear, colorless liquids labeled A, B, and C. She observes that when liquid A is mixed with B, they blend completely. When A is mixed with C, a layer forms between them. Based on the particle theory of matter, what can she infer about the substances?

• Liquids A and C have the same kind of particles.

• Liquids A and B do not mix because their particles repel each other.

• Liquids A and B likely have similar particles that interact well together.

• Liquids B and C have identical particles because they are both colorless.

Which of the following supports the idea that different pure substances have different particles?

• Water and oil do not mix.

• Air and gas are the same.

• Water can turn into steam.

• All solids melt when heated

Which of the following scenario best describes the movement of gas particles when perfume is sprayed on one side of the room? Why does a gas fill in the entire container when it is placed in?

• The perfume and gas particles mixed but remain on one side of the room because they are heavy in one side of the room.

• The perfume and gas particles mix with air and move rapidly spreading throughout the room.

• The perfume and gas particles mixed with air, moves slowly and spread throughout the room.

• The perfume and gas particles attract each other, spreading the smell throughout the room.