Chemistry Semester 2 Review 25/26

In covalent bonds, electrons are ___________.

• transferred
• gained
• lost
• shared

Tags

NGSS.HS-PS1-1

What two types of atoms make a covalent bond?

• 2 Nonmetals

• 1 Nonmetal and 1 Metal

• 2 Metals

• 2 Noble Gases

According to the octet rule most elements need _______ valence electrons.

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

How many valence electrons are in Phosphorus?

• 15
• 4
• 5
• 31

Tags

NGSS.HS-PS1-1

Mole in Chemistry is a(an)_______.

• unit that helps measure chemicals

• animal

• number equal to 6.022

• number equal to 12

What are the units for molar mass?

• grams
• amu
• grams/mole
• liters

22.4 L of a gas represents

• 10 mol of a gas

• 5 mol of a gas

• 22.4 mol of a gas

• 1 mol of a gas

Tags

NGSS.HS-PS1-7

1 mole of something is a lot. For example, a mole of dollar bills stacked would reach from the sun to pluto and back 7.5 million times. Why?

• The mole is big because Avogadro likes big numbers

• The mole is big because molecules are big

• The mole is big because particles are insanely small

• The mole is big because it ate too much dirt

Choose the FALSE statement

• Volume is measured in Liters

• Moles is used to measure tiny particles

• Formula unit is a type of tiny particle

• Grams is measured in mass

Answer explanation

Mass is measured in grams.

Tags

NGSS.HS-PS1-7

What is the molar mass of Sodium Hydroxide?

• 368 g/mole

• 40 g/mole

• 57 g/mole

• 23 g/mole