26 Questions
What is an element in chemistry?
A substance that cannot be broken down to other substances by chemical reactions
How many elements are essential to life?
25
What are trace elements in the context of organisms?
Elements required by an organism in minute quantities
What is a compound in chemistry?
A substance that can be broken down to other substances by chemical reactions
What is the smallest unit of matter that retains the properties of an element?
Atom
Which subatomic particles form the atomic nucleus?
Neutrons
What are isotopes?
Different atomic forms of an element with varying numbers of protons and neutrons
What is the process by which radioactive isotopes decay spontaneously, giving off particles and energy?
Radioactive decay
What is a molecule?
Two or more atoms held together by covalent bonds
What type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
Covalent bond
What is potential energy?
The energy that matter has because of its location or structure
"An attraction between 2 atoms, resulting from a sharing of outer-shell electrons or the presence of opposite charges on the atoms" refers to what?
"Chemical bond"
"Electronegativity" is defined as what?
'An atom’s attraction for the electrons in a covalent bond'
"Carbon isotopes" are different atomic forms of carbon that have the same number of protons but differ in what?
'Number of neutrons'
"Metan (CH4)" is an example of what?
'A compound'
What are some applications of radioactive isotopes?
All of the above
Which of the following statements best describes an essential element?
An element that is required by an organism to survive, grow, and reproduce
What distinguishes a compound from its constituent elements?
Compounds have characteristics different from those of their constituent elements
How many of the 94 elements are essential to life?
Approximately 25
What are trace elements in the context of organisms?
Elements that are required by an organism in minute quantities
In the context of chemistry, what does it mean for an element to be 'essential'?
It cannot be replaced by any other chemical element
What term refers to the smallest unit of matter that still retains the properties of an element?
Atom
Which type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
Covalent bond
What analogy is used to describe the energy levels of electrons in an atom?
A ball bouncing down a flight of stairs
What is defined as an element’s attraction for the electrons in a covalent bond?
Electronegativity
Which subatomic particles form the atomic nucleus?
Neutrons and protons
Test your understanding of the chemical context of life with questions on matter, elements, compounds, atoms, isotopes, molecules, chemical bonds, and chemical reactions in cells.
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