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WorksheetsChemistry of Life
Total questions: 25
Worksheet time: 10mins
The smallest unit of an element that still retains the properties of that element is a (an)
electron
molecule
neutron
atom
The number of electrons in an atom is equal to
Avogadro's Number
Mass number
the atomic number
the number of neutrons
Carbon forms chemical bonds with other atoms by achieving a stable or complete outermost energy shell. This is accomplished when carbon
Loses two electrons
Gains two electrons
Shares two electrons
loses four electrons
A polar covalent bond between atom occurs when
One of the atoms has a greater affinity for electrons than the other atom
The atoms attract the electrons equally
An electron from one of the atoms is completely transferred to the other atom
The molecule becomes ionized
A cation is a (an)
Uncharged atom
Positively charged ion
Negatively charged ion
Atom that has gained an electron
In a decomposition reaction
The reactants gain electrons
Atoms are transferred from one molecule to another
Large molecules are broken down to form small molecules
none of the choices
The energy required to start a chemical reaction is called
Equilibrium energy
Endergonic energy
Exergonic energy
Activation energy
In freely reversible reactions
There is a small activation energy
Reactants form products and products form reactants
The ratio of products to reactants remain constant
None of the choices
The rate of chemical reactions is influenced by
The concentration of the reactants
Temperature
Enzymes
None of the choices
Water
Is composed of two oxygen atoms and one hydrogen atom
Has a low specific heat
Is composed of polar molecules into which ionic substances dissociate
Is produced by hydrolysis reaction
When sugar is dissolved in water, the water is called the
Solute
Solvent
Solution
Salient
A buffer
Slows down chemical reactions
Speeds up chemical reactions
Increases the pH of solutions
Maintains a relatively constant pH
Oxygen
Is an inorganic molecule
Is released from glucose when glucose is broken down for energy
Combines with carbon dioxide and is released from the body
All of the choices are correct
Which of the following is an example of a carbohydrate?
Glycogen
Wax
Steroid
DNA
The basic units or building blocks of fats are
Simple sugars (monosaccharides)
Double sugars (disaccharides)
Amino acids
Glycerol and fatty acids
A peptide bond joins together
Amino Acids
Fatty Acids
Disaccharides
Nucleotides
DNA
Is the genetic material
Is a single strand of nucleotides
Contains the nucleotide uracil
None of the choices
ATP
Is formed by the addition of a phosphate group to ADP
Is formed with energy released during catabolism reactions
Provides the energy for anabolism reactions
Contains three phosphate groups
DNA codes for proteins, which are the building blocks of organisms. What is the most abundant protein in the human body?
collagen
tubulin
albumin
keratin
You can't live without water! What is its chemical formula?
H2
H2O
O2
H2O2
The symbol Ag stands for which element?
silver
gold
magnesium
gallium
You can't live without iron. Where in the body is most of the iron located?
brain
bones
skin
blood
A drop of food coloring spreading out in a cup of water is an example of which transport process?
diffusion
effusion
vapor pressure
osmosis
What do you call an atom that has more protons than electrons?
a cation
an isotope
a molecule
an anion
Three of the most common states of matter are solids, liquids, and gases. A liquid has:
A defined volume, but not a defined shape
A definite shape, but no defined volume
A defined volume and shape
No defined volume or shape
