Avogadro's Number

What is the molar mass of Br?

• 79.9 g / mol

• 79.9 mol / g

• 35 g / mol

• 35 mol / g

What is the molar mass of Carbon?

• 6 g / mol

• 6 mol / g

• 12.0 g / mol

• 12.0 mol / g

What is the molar mass of N₂O₄?

• 6 g / mol

• 30 g / mol

• 92 g / mol

• 100 g / mol

What is the molar mass of Al(OH)₃?

• 7 g / mol

• 44 g / mol

• 76 g / mol

• 78 g / mol

Physical and chemical changes involve _____ .

• Energy

• Bubbles

• Change of shape

• New substances

Tags

NGSS.HS-PS1-4

A chemical reaction is the process of breaking molecular bonds and reforming them into a new _____.

• atom

• element

• substance

• mixture

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The law of conservation of mass states that the total mass of products must _____.

• never equal the total mass of the reactants.

• equal the total mass of the reactants.

• destroy atoms of the reactants.

• create new atoms from the reactants.

Tags

NGSS.HS-PS1-7

Choose the selection that represents the number 434 in scientific notation.

• 43.4 x 10²

• 43.4 x 10^-2

• 4.34 x 10^-2

• 4.34 x 10²

Choose the correct scientific notation for the number 0.00457

• 0.457 x 10^-2

• 045.7 x 10^-4

• 4.57 x 10^-3

• 0.00457 x 10³

A mole of any substance is equal to ____.

• 6.02 x 10²²

• 6.02 x 10²³

• 6.02 x 10^-22

• 6.02 x 10^-23

Tags

NGSS.HS-PS1-7