STAAR Science

Which two atoms are of elements in the same group in the periodic table?

• Atom 1 and Atom 2

• Atom 1 and Atom 4

• Atom 2 and Atom 3

• Atom 3 and Atom 4

Tags

NGSS.MS-PS1-1

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

• Nitrogen (N)

• Sulfur (S)

• Arsenic (As)

• Silicon (Si)

The model of the periodic table below shows the locations of four elements.

A student is asked to identify an element that is a pale-yellow brittle solid and does not conduct electricity. At which location in this periodic table would the element most likely be found?

• 1

• 2

• 3

• 4

Which statement does NOT correctly compare silicon with another element?

• Silicon is a better conductor of electricity than sulfur.

• Silicon conducts electricity as well as copper does.

• Silicon is a solid at room temperature, but argon is a gas.

• Silicon is less malleable than silver.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3

Aluminum, sulfur, and chlorine are elements found on the periodic table. Tests involving these three element would show that at normal room temperature -

• sulfur is malleable and aluminum conducts electricity

• chlorine is malleable and conducts electricity

• aluminum is malleable and conducts electricity

• all three elements are malleable and conduct electricity

Some students conducted a laboratory investigation to learn more about the physical properties of different elements. They observed four samples and recorded their observations in the table below.

Based on these observations, which sample is most likely a nonmetal?

• Sample 1

• Sample 2

• Sample 3

• Sample 4

Which chemical reaction involves the fewest oxygen atoms?

• 2AgNO₃ + K₂SO₄ → Ag₂SO₄ + 2KNO₃

• 4Fe +6H₂O + 3O₂ → 4Fe(OH)₃

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

• C₂H₄ + 3O₂ → 2CO₂ +2H₂O

Tags

NGSS.MS-PS1-1

The table lists some compounds found in foods and their formulas. Based on this information, which of these statements is NOT true?

• A molecule of sorbitol contains three more oxygen atoms than a molecule of glutamine does.

• A molecules of lactose contains twice as many atoms as a molecule of fructose does.

• A molecule of fructose contains four more atoms than a molecule of glutamine does.

• A molecules of lactose contains twice as many carbon atoms as a molecule of sorbitol does.

Tags

NGSS.MS-PS1-1

Strontium phosphate, Sr₃(PO₄)₂, is a crystalline substance used in medicine and industry. How many phosphorus atoms are present in the formula for Sr₃(PO₄)₂?

• 2

• 3

• 4

• 8

Tags

NGSS.MS-PS1-1

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

• H₃PO₄

• H₂SO₄

• HClO₃

• H₂O

Tags

NGSS.MS-PS1-1