WorksheetsCh 2 Chemistry of Life Review
Total questions: 20
Worksheet time: 10mins
What is an atom?
Basic unit of matter
Has a positive charge and is found in the nucleus
Contains different numbers of neutrons
Has a neutral charge and can be found in the nucleus
A solution has a pH of 4. What is this solution?
Neutral
Acidic
Basic
None
Blood is an example of what type of mixture?
Solvent
Solution
Suspension
Solute
What is the mixture when ions are gradually dispersed in water?
Suspension
Solute
Solvent
Solutions
Carbon, Hydrogen, Oxygen, and Nitrogen are the atoms that make up which organic compound?
Carbohydrates
Nucleic Acids
Lipids
Proteins
Substrates bind to what on an enzyme in a chemical reaction?
Reactant
Active Site
Activation Energy
Product
Without enzymes, how would this affect the chemical reactions of living things?
Would occur too slowly to be effective, and life could not function
Nothing would happen and continue as normal
Activation energy would be lower making chemical reactions faster
Activation energy would be higher making chemical reactions faster
Which subatomic particle has a neutral charge?
Atom
Proton
Neutron
Electron
What is an isotope?
atoms of the same element that have different numbers of protons
atoms of the same element that have different numbers of neutrons
atoms of the same element that have different numbers of electrons
atoms of the same element that have the same number of neutrons
Ionic bonds are...
the transfer of electrons from one atom to another
electrons are shared between atoms
happen only in isotopes
happens in water molecules
__________ has the function of short term energy.
lipids
nucleic acids
carbohydrates
proteins
What changes occur to chemical bonds during a chemical reaction?
polymers are formed
activation energy is created by the breaking of bonds
existing bonds break while new bonds form.
bonds stay the same
Which organic molecule has the monomer amino acids?
Lipids
Proteins
Nucleic acids
Carbohydrates
What does it mean when a molecule is polar?
that the molecule has unevenly distributed charges
it can be found only in the North and South Poles
that the molecule has evenly distributed charges
it turns into an ice cube
This property of water causes water molecules to be drawn together, which is why drops of water form beads on a smooth surface.
adhesion
cohesion
capillary action
heat capacity
What is the attraction between molecules of different substances?
surface tension
cohesion
adhesion
heat capacity
A solution is neutral if it has a pH of...
0
14
5
7
A polymer is formed from repeated _______
carbohydrates
lipids
organic compounds
monomers
Which is a property that carbon has to form different large and complex structures?
has 3 valence electrons
can easily bond with itself
has 2 valence electrons
carbon has no special properties
What are van der Waal forces?
Slight strong attraction that develops between oppositely charged regions of nearby molecules
the transferring of electrons from one atom to another
Slight weak attractions that develop between oppositely charged regions of nearby molecules
form multiple hydrogen bonds, which accounts for many of water’s special properties
