Podcast
Questions and Answers
What is an element in chemistry?
What is an element in chemistry?
- A substance with characteristics different from those of its elements
- A substance that cannot be broken down to other substances by chemical reactions (correct)
- A substance consisting of two or more elements in a fixed ratio
- A substance that can be broken down to other substances by chemical reactions
How many elements are essential to life?
How many elements are essential to life?
- 50
- 10
- 25 (correct)
- 94
What are trace elements in the context of organisms?
What are trace elements in the context of organisms?
- Elements that are not required by an organism
- Elements required by an organism in large quantities
- Elements that consist of more than one element
- Elements required by an organism in minute quantities (correct)
What is a compound in chemistry?
What is a compound in chemistry?
What is the smallest unit of matter that retains the properties of an element?
What is the smallest unit of matter that retains the properties of an element?
Which subatomic particles form the atomic nucleus?
Which subatomic particles form the atomic nucleus?
What are isotopes?
What are isotopes?
What is the process by which radioactive isotopes decay spontaneously, giving off particles and energy?
What is the process by which radioactive isotopes decay spontaneously, giving off particles and energy?
What is a molecule?
What is a molecule?
What type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
What type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
What is potential energy?
What is potential energy?
"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?
"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?
"Electronegativity" is defined as what?
"Electronegativity" is defined as what?
"Carbon isotopes" are different atomic forms of carbon that have the same number of protons but differ in what?
"Carbon isotopes" are different atomic forms of carbon that have the same number of protons but differ in what?
"Metan (CH4)" is an example of what?
"Metan (CH4)" is an example of what?
What are some applications of radioactive isotopes?
What are some applications of radioactive isotopes?
Which of the following statements best describes an essential element?
Which of the following statements best describes an essential element?
What distinguishes a compound from its constituent elements?
What distinguishes a compound from its constituent elements?
How many of the 94 elements are essential to life?
How many of the 94 elements are essential to life?
What are trace elements in the context of organisms?
What are trace elements in the context of organisms?
In the context of chemistry, what does it mean for an element to be 'essential'?
In the context of chemistry, what does it mean for an element to be 'essential'?
What term refers to the smallest unit of matter that still retains the properties of an element?
What term refers to the smallest unit of matter that still retains the properties of an element?
Which type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
Which type of chemical bond involves the sharing of one or more pairs of valence electrons by two atoms?
What analogy is used to describe the energy levels of electrons in an atom?
What analogy is used to describe the energy levels of electrons in an atom?
What is defined as an element’s attraction for the electrons in a covalent bond?
What is defined as an element’s attraction for the electrons in a covalent bond?
Which subatomic particles form the atomic nucleus?
Which subatomic particles form the atomic nucleus?
