7th Grade Science TCAP Practice PS1.1,PS1.2,PS3.2 Intervention

A student examines three substances made of different atoms: - Substance A: Hydrogen, Oxygen - Substance B: Carbon, Oxygen - Substance C: Sodium, Chlorine Which conclusion is best supported by the data?

• All substances are made of the same atoms

• Different combinations of atoms form different substances

• Only gases are made of atoms

• Atoms cannot combine to form new substances

A student mixes salt and sand and records the following properties: Salt is white and dissolves in water; Sand is tan and does not dissolve in water; the Mixture has mixed colors and partially dissolves. Which conclusion is best supported?

• A chemical reaction occurred

• The substances formed a new compound

• The substances retained their original properties

• The atoms were rearranged

A student heats a mixture of two substances and observes a color change and gas production. Which statement best explains this observation?

• A physical change occurred

• A chemical reaction occurred forming new substances

• The substances remained unchanged

• Only temperature changed

The following properties were recorded before and after a reaction: - Before Reaction: Clear color, 22°C, No gas formation - After Reaction: Cloudy color, 30°C, Gas present Which evidence best supports that a chemical reaction occurred?

• The substances were clear before

• The temperature increased and gas formed

• The reaction started at room temperature

• The substances were liquids

A student compares two processes: - Process A: Substances mixed, no new substance forms - Process B: New substance forms with different properties Which statement correctly identifies the processes?

• Process A is a chemical reaction; Process B is a mixture

• Both are chemical reactions

• Process A is a mixture; Process B is a chemical reaction

• Both are mixtures

A model shows atoms rearranging during a reaction: Reactants: AB + C Products: AC + B Which statement best explains this model?

• Atoms are destroyed

• Atoms are rearranged to form new substances

• New atoms are created

• Only one substance changes

A student analyzes the mass of substances before and after a reaction. The total mass before the reaction was 50g, and the total mass after the reaction was 50g. Which law does this support?

• Law of Motion

• Law of Conservation of Mass

• Law of Gravity

• Law of Energy

A student observes digestion as a chemical process. Which statement best explains how food supports growth?

• Food remains unchanged in the body

• Chemical reactions break food into new molecules used for growth

• Food is only stored as energy

• Energy is destroyed during digestion

In a biological process, food molecules are broken down and energy is released. Which conclusion is best supported?

• Energy is absorbed and stored only

• Chemical reactions in the body release energy

• Food does not undergo chemical change

• Only physical changes occur

A student compares two substances before and after mixing: - Before Mixing: Clear + Clear color, 20°C - After Mixing: Yellow color, 28°C Which conclusion is most reasonable?

• A chemical reaction occurred producing a new substance

• The substances remained the same

• Only a physical change occurred

• No energy change happened