Bio 1201 Exam 1 comprehensive
Questions and Answers with Verified
Solutions
Question 1:
What are the three parts of an atom, and what role do each of them
place?
Answer:
- Proton: Positive charge and is found in the nucleus. Protons determines
the atom's identity - Neutron: No charge and is found in the nucleus. They
add mass and help stabilize the nucleus - Electron: Negative charge and
move around the outside of the nucleus in electron clouds. They are
responsible for how atoms bond and react with other atoms
Question 2:
What is the difference between a molecule and a compound?
Answer:
- Molecule: Two or more atoms chemically bonded together. Can be the
same element or different ones. - Compound: A substance made of two
or more different elements chemically bonded together.
Question 3:
What are the four essential elements?
Answer:
The four essential elements are Carbon, Hydrogen, Oxygen, and
Nitrogen (CHON)
,Question 4:
How do you read an element's periodic table block?
Answer:
Top = atomic number/identity Middle = symbol + name Bottom = atomic
mass P + N
Question 5:
What are the INTERmolecular forces?
Answer:
- Covalent bonds: atoms share electrons - Ionic bonds: one atom
transfers electrons to another, creating charged ions that attract
Question 6:
What are the INTRAmolecular forces?
Answer:
- The forces that hold atoms together within a molecule or compound
INTRA = inside
Question 7:
What's the difference between
Answer:
- Polar: when atoms share electrons unequally - Nonpolar: when atoms
share electrons equally
, Question 8:
What are the three main properties of salts?
Answer:
- High melting and boiling points: strong ionic attractions hold the ions
together - Brittle, Crystalline solids: Their ions form an organized crystal
lattice making them hard but likely to break when struck - Conduct
electricity when dissolved in water or melted: The ions are free to move
and carry electric charge
Question 9:
How do hydrogen bonds work ?
Answer:
- Hydrogen bonds are weak attractions between molecules. They happen
when a hydrogen atom that is bonded to a very electronegative atom is
attracted to another electronegative atom nearby.
Question 10:
What do hydrogen bonds look like?
Answer:
Dotted lines
Question 11:
How do Van Der Waals forces work?
Answer:
Van der Waals forces are weak attractions between atoms or molecules.
They are a type of intermolecular force, meaning they act between
molecules, not within them.
Questions and Answers with Verified
Solutions
Question 1:
What are the three parts of an atom, and what role do each of them
place?
Answer:
- Proton: Positive charge and is found in the nucleus. Protons determines
the atom's identity - Neutron: No charge and is found in the nucleus. They
add mass and help stabilize the nucleus - Electron: Negative charge and
move around the outside of the nucleus in electron clouds. They are
responsible for how atoms bond and react with other atoms
Question 2:
What is the difference between a molecule and a compound?
Answer:
- Molecule: Two or more atoms chemically bonded together. Can be the
same element or different ones. - Compound: A substance made of two
or more different elements chemically bonded together.
Question 3:
What are the four essential elements?
Answer:
The four essential elements are Carbon, Hydrogen, Oxygen, and
Nitrogen (CHON)
,Question 4:
How do you read an element's periodic table block?
Answer:
Top = atomic number/identity Middle = symbol + name Bottom = atomic
mass P + N
Question 5:
What are the INTERmolecular forces?
Answer:
- Covalent bonds: atoms share electrons - Ionic bonds: one atom
transfers electrons to another, creating charged ions that attract
Question 6:
What are the INTRAmolecular forces?
Answer:
- The forces that hold atoms together within a molecule or compound
INTRA = inside
Question 7:
What's the difference between
Answer:
- Polar: when atoms share electrons unequally - Nonpolar: when atoms
share electrons equally
, Question 8:
What are the three main properties of salts?
Answer:
- High melting and boiling points: strong ionic attractions hold the ions
together - Brittle, Crystalline solids: Their ions form an organized crystal
lattice making them hard but likely to break when struck - Conduct
electricity when dissolved in water or melted: The ions are free to move
and carry electric charge
Question 9:
How do hydrogen bonds work ?
Answer:
- Hydrogen bonds are weak attractions between molecules. They happen
when a hydrogen atom that is bonded to a very electronegative atom is
attracted to another electronegative atom nearby.
Question 10:
What do hydrogen bonds look like?
Answer:
Dotted lines
Question 11:
How do Van Der Waals forces work?
Answer:
Van der Waals forces are weak attractions between atoms or molecules.
They are a type of intermolecular force, meaning they act between
molecules, not within them.
