Ps1-4

Which of the following is a chemical change?

• Melting ice

• Decay of pumpkin

• Boiling water

• Breaking glass

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a physical change?

• Rusting iron

• Burning paper

• Melting ice

• Boiling an egg

What is the smallest unit of an element that retains its properties?

• Molecule

• Atom

• Compound

• Mixture

Which of the following is a compound?

• Oxygen (O2)

• Water (H2O)

• Gold (Au)

• Helium (He)

Tags

NGSS.MS-PS1-1

Which of the following is an element?

• Salt (NaCl)

• Carbon (C)

• Water (H2O)

• Sugar (C6H12O6)

What is a mixture?

• A substance made of two or more elements chemically combined

• A substance made of two or more elements physically combined

• A single element

• A single compound

Which of the following is an example of a mixture?

• Carbon dioxide (CO2)

• Salt (NaCl)

• Air

• Water (H2O)

What is the atomic number of an element?

• The number of protons in an atom

• The number of neutrons in an atom

• The number of electrons in an atom

• The total number of protons and neutrons

A model of an atom is shown. An atom of which element is represented by this model?

• Boron (B)

• Carbon (C)

• Sodium (Na)

Tags

NGSS.MS-PS1-1

Which property of an unknown element determines the other elements it reacts with?

• The total number of neutrons of the unknown element
• The total number of particles in the nucleus of the unknown element
• The number of protons of the unknown element
• The number of valence electrons of the unknown element

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2