30 Questions
Which of the following is true about the atomic number of an element?
It is determined by the number of electrons.
Which of the following is true about the mass number of an atom?
It can change if the number of neutrons changes.
Which of the following is true about valence electrons?
They are found in an atom's outermost shell.
Which of the following elements has 4 valence electrons?
Carbon
Which of the following elements is the most abundant in living things?
Carbon
Which of the following particles has a positive charge?
Proton
Which of the following particles is electrically neutral?
Neutron
Which of the following particles has a negligible mass?
Electron
Which of the following is true about covalent bonds?
They result from electron sharing.
Which of the following is true about orbitals?
Each orbital can hold 2 electrons.
Which type of chemical bond involves the complete transfer of electrons from one atom to another?
Ionic bond
Which type of bond is the strongest?
Nonpolar covalent bond
Which form of energy is stored in the chemical bonds that link together atoms to form molecules?
Chemical energy
What is the currency for most of the energy needs of cells?
Adenosine triphosphate (ATP)
Which type of reaction releases energy?
Exergonic
What are the two ways to speed up most reactions?
Increase temperature and decrease concentration of reactants
What is metabolism?
The sum of all the chemical reactions occurring in every cell
Where does energy and matter enter the biosphere?
At the base of the food chain
What property of water allows it to dissolve polar and charged molecules?
Water's polar nature
Why does ice float in water?
Ice is less dense than water
Which force causes the formation of a meniscus at the surface of water when it meets a solid surface?
Adhesion
What property of water prevents light objects from falling through its surface?
Surface tension
What property of water allows it to move in biological systems such as roots and leaves?
Cohesion
What is the term for the concentration of H+ and OH- ions present in a solution?
pH
What do cells use to protect against the damaging effects of pH changes?
Buffers
What determines the functional behavior of a molecule in organic chemistry?
Functional groups
What are the building blocks of proteins?
Amino acids
What type of bonds form between amino acids to create proteins?
Peptide bonds
What property of carbon allows it to form different combinations of bonds and molecular shapes?
Carbon's versatility
What property of water allows it to absorb and retain a high amount of energy?
Heat capacity
Test your knowledge of the chemical basis of life with this quiz on water and carbon. Learn about the key elements that make up living things and their roles in structure and function. Explore the properties of matter and understand the significance of protons, neutrons, and electrons.
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