Category 1 Science STAAR Review

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

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

Which information could a student determine from only the chemical formula of a protein?

• The color of the protein

• The number of molecules in each sequence that makes up a protein

• The physical arrangement of atoms in the structure of the protein

• The number of atoms of each element in the protein

Tags

NGSS.MS-PS1-1

A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred.

Which observation of this process provides evidence of a chemical reaction?

• Hot water heated the aluminum foil.

• The liquid solution changed color.

• The pan was lined with aluminum foil.

• The hot water cooled.

Tags

NGSS.MS-PS1-2

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

Tags

NGSS.MS-PS1-2

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

• H₃PO₄

• H₂SO₄

• HClO₃

• H₂O

Tags

NGSS.MS-PS1-1

Which characteristics of PROTONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Which characteristics of NEUTRONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Which characteristics of ELECTRONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Substance that cannot be broken down into simpler substances.

Ex. Hydrogen, Oxygen, Helium

• Elements

• Isotope

• Neutrons

• Electrons

Tags

NGSS.MS-PS1-1