5 Written questions
5 Matching questions
- Does form impact function?
- What are the molar concentrations of hydrogen and hydroxide ions in one liter of pure water?
- Draw functional group structure and give molecular formula for: Amino.
- Why is water in the solid phase less dense? How does this support life?
- Draw functional group structure and give molecular formula for: Carboxyl.
- a YES!
- b Carboxyl (-COOH) acidic properties, components of many biologically important molecules; C double bonded to O and single to OH
Ex: Formic acid or acetic acid
- c H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
- d Hydrogen bonds keep the molecules spread out, so they don't pack together, making them less dense.
The floating ice insulates the body of water underneath it; if ice sank, then all the bodies of water would freeze solid, making life unlivable.
- e Amino (-NH₂) (acts as a base, amino acids); N single bonded to 2 H's
5 Multiple choice questions
- Carbonyl (>CO) (ketones, aldehydes, sugars); C double bonded to O
Ex: Acetone, the simplest ketone
- Resistance to change in temperature
- Hydrogen bonds are the bonds between two polar molecules - one with a partial positive charge and one with a partial negative charge; water is perfect for this because it has the partial negative of Oxygen and the partial positive of Hydrogen.
- Methyl (−CH₃) (sex hormones, DNA methylation (when it gets tagged onto your DNA); C single bonded to 3 H's
−C − H
Ex: 5-methyl cytidine
- Waters specific heat is much higher that that of other solvents; this is because of hydrogen bonding; this keeps temperatures of places near/on bodies of water consistent
5 True/False questions
Be able to calculate the molar concentrations of hydrogen and hydroxide ions from a given pH value or vice versa. → H⁺ = 10⁻⁷ and OH⁻ = 10⁻⁷ Equation: [H⁺][ OH⁻] = 10⁻¹⁴ (always = to 14)
What is a hydrocarbon? Polar or non-polar? → WATER!
How many valence electrons does carbon have? How many single covalent bonds can it form? → Carbon and Hydrogen
Organic molecules must always contain what? → Carbon and Hydrogen
Why is carbon the basic building element of life? → Because it can bond to 4 other atoms (tetravalent - 4 valence electrons)