2022 STAAR Test Category 1

Sodium and lithium have similar chemical properties. What

characteristic of these elements explains why they are chemically

similar?

• Their atoms both have one valence electron.

• Their atoms both have more neutrons than protons.

• Their atoms have the same number of energy levels.

• Their atoms contain equal numbers of protons and electrons.

The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus. Which statements best describe the charges on the particles in this model?

• Both particles X and Y have a positive charge.

  Particle Z has a negative charge.

• Both particles X and Y have a negative charge.

  Particle Z has a positive charge.

• Either particle X or particle Y has a positive charge.

  Particle Z has a negative charge.

• Either particle X or particle Y has a negative charge.

  Particle Z has a positive charge.

Tags

NGSS.MS-PS1-1

Students collected data on five elements. Their data are shown in

the table. Which element has the same number of energy levels as lithium?

• Beryllium

• Sodium

• Magnesium

• Potassium

Tags

NGSS.MS-PS1-1

Oxygen and oxygen-containing compounds are involved in many

different reactions. Which balanced equation represents a reaction

that involves 14 atoms of oxygen?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A Texas Gulf Coast energy pyramid is shown with representative

organisms at each trophic level. Which statement best describes the flow of energy through this pyramid?

• The trophic level represented by catfish and gobies receives

  energy directly from the producers.

• The trophic level represented by shrimp and copepods receives

  energy directly from the tertiary consumers.

• The trophic level represented by redfish and flounder receives

  energy directly from the secondary consumers.

• The trophic level represented by wire grass and phytoplankton

  receives energy directly from the primary consumers.

Tags

NGSS.MS-LS2-3

Which of these observations is an indication that a chemical

reaction has occurred?

• Steam forms above boiling water.

• A solid forms when a clear solution is frozen.

• A solid forms when two clear solutions are mixed.

• Sugar crystals form on the sides of a boiling pot of sugar water.

Tags

NGSS.MS-PS1-2

Which element has chemical properties that are most similar to the

chemical properties of sulfur, S?

• Silicon, Si

• Chlorine, Cl

• Selenium, Se

• Phosphorus, P

A student prepared diagrams to model atoms of two elements. Atoms of which two elements are represented by these models?

• Oxygen‚ O, and Neon, Ne

• Fluorine, F, and Neon, Ne

• Silicon, Si, and Phosphorus, P

• Beryllium, Be, and Boron, B

Tags

NGSS.MS-PS1-1

If a Fluorine atom has a mass number of 19, how many neutrons

are in the atom?

Students performed a lab investigation on chemical reactions. The

students put on goggles and plastic gloves and then followed these

steps. Which observation would indicate that a chemical reaction

occurred?

• The vinegar took the shape of the container in step 1.

• The steel wool sank into the vinegar in step 3.

• The temperature of the vinegar increased during step 4.

• The steel wool changed shape during step 6.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5