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- 1. Multiple Choice
combination of atoms of same elements is known as
molecule
element
compound
atom
- 2. Multiple Choice
symbol of potassium
pb
Na
Fe
k
- 3. Multiple Choice
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.
- 4. Multiple Choice
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.
- 5. Multiple Choice
What are atoms composed of?
Protons and electrons.
Protons, neutrons, and electrons.
Neutrons and electrons.
Ions, elements, and compounds.
- 6. Multiple Choice
What is gold?elementcompoundmixture - 7. Multiple ChoiceThe beginning substances in a chemical reaction are called...reactantsproducts
- 8. Multiple Choice
How many H atoms are in H2O?
1
2
- 9. Multiple ChoiceCarbon dioxide (CO2) contains how many atoms of oxygen?0123
- 10. Multiple Choice
The formula of quick lime is
CaCO3
CaCl2
MgO
CaO
- 11. Multiple Choice
The ratio of of H and O in H2O by mass is
1:9
1:8
1:7
1:6
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