Atoms and molecules

Which of these items is made up of one or more molecules?

• Gold
• Hydrogen
• Salt 
• Neon 

Tags

NGSS.MS-PS1-1

The smallest unit of an element that still has the properties of that element.

• Atom
• Adam
• Nucleus
• Element

When you cool matter, what happens to the atoms and molecules?

• they move faster

• they move slower

• they stop moving

• they stay the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the molar mass of CO₂?

• 22.0 g/mol
• 28.0 g/mol
• 44.0 g/mol
• 56.0 g/mol

Which of the following is a chemical formula?

• H₂SO₄

• Si

• Hg

• C

Tags

NGSS.MS-PS1-1

Which of the following is a chemical symbol?

• H₂O

• O

• NaCl

• FeO

A mole of Neon contains
6.02 x 10²³ _____.

• atoms
• formula units
• ions
• molecules

What is an ion?

• a charged atom

• an atom with different neutrons

• atoms with no protons

• atoms with no electrons

Tags

NGSS.MS-PS1-1

Which of the following statements regarding the mole is incorrect?

• A mole is a counting unit equal to 6.02 x 1023 particles.

• The number of particles in a mole is known as Avogadro’s number.

• A mole of particles of an element is numerically equal to the atomic mass of the element.

• none of the above

What is the molar mass of carbon?

• 6.0 g/mol
• 12.0 g/mol
• 22.4 g/mol
• 6.02 x 10²³ g/mol