ATOMS AND MOLECULES

combination of atoms of same elements is known as

• molecule

• element

• compound

• atom

symbol of potassium

• pb

• Na

• Fe

• k

What does conservation of matter mean?

• Matter cycles through an ecosystem and 10% is lost as you move through each trophic level.

• Matter cannot be created, but can be destroyed.

• Matter cannot be created nor destroyed, and cycles through ecosystems.

• Matter and energy both move through ecosystems with 100% efficiency.

Tags

NGSS.MS-LS2-3

What is an element?

• A pure substance that cannot be broken down.

• Two atoms bonded together.

• Two or more different types of atoms bonded together.

• An molecule with an unequal distribution of charge.

What are atoms composed of?

• Protons and electrons.

• Protons, neutrons, and electrons.

• Neutrons and electrons.

• Ions, elements, and compounds.

Tags

NGSS.MS-PS1-1

What is gold?

• element
• compound
• mixture

Tags

NGSS.MS-PS1-1

The beginning substances in a chemical reaction are called...

• reactants
• products

How many H atoms are in H₂O?

• 1

• 2

Tags

NGSS.MS-PS1-1

Carbon dioxide (CO₂) contains how many atoms of oxygen?

• 0
• 1
• 2
• 3

Tags

NGSS.MS-PS1-1

The formula of quick lime is

• CaCO3

• CaCl2

• MgO

• CaO