Science STAAR

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

Tags

NGSS.MS-PS1-2

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

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

NGSS.MS-PS1-2

A student is using colored beads to make a model of aluminum sulfate, Al₂(SO₄)₃. Aluminum atoms are represented by blue beads, sulfur atoms by yellow beads, and oxygen atoms by green beads.

What combination of beads should the students use for the model?

• 6 blue, 3 yellow, and 7 green

• 2 blue, 1 yellow, and 4 green

• 2 blue, 3 yellow, and 12 green

• 6 blue, 12 yellow, and 12 green

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

Which substances have the same number of carbon atoms?

• Substances 1 and 2

• Substances 2, 3, and 4

• Substances 2 and 3 only

• Substances 1 and 3

Tags

NGSS.MS-PS1-1

Seratonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown below.
C₁₀H₁₂N₂O
How many atoms in all are in a molecule of seratonin?

• 25

• 1

• 10

• 4

Tags

NGSS.MS-PS1-1

A manufacturer selected a metal to use in producing a lightweight button for clothing. A metal that has a density of 2.71 g/cm³ was selected.

Which of the metals was selected?

• Metal 1

• Metal 2

• Metal 3

• Metal 4