Textbook questions - chapter two Flashcards
The science of the interaction between atoms and molecules is called chemistry?
Yes.
The metabolic activities of microorganisms involve complex chemical reactions.
Yes.
Microbes break down nutrients to obtain energy and make new cells.
Yes.
Is an atom the smallest unit of a chemical element that exhibits properties of that element?
Yes.
Do atoms consist of a nucleus, which contain protons and neutrons, and electrons, which move around the nucleus?
Yes.
Is the atomic number the number of protons in the nucleus, the total number of protons and neutrons the atomic weight?
Yes.
Are atoms with the same number of protons and the same chemical behaviour classified as the same chemical element?
Yes.
Are chemical elements designated by abbreviations called chemical symbols?
Yes.
Are about 26 elements found in living cells?
Yes.
Are atoms that have the same atomic number but different atomic weights called isotopes?
Yes.
In an atom, electrons are arranged around the nucleus in electron shells.
Yes
Each shell can hold a characteristic maximum number of electrons.
Yes
The chemical properties of an atom are largely due to the number of electrons in its outermost shell
Yes
Molecules are made up of two or more atoms; molecules consisting of at least two different kinds of atoms are called compounds
Yes.
Atoms form molecules in order to fill their outermost electron shells.
Yes.
Attractive forces that bind two atoms together are called chemical bonds.
Yes.
The combining capacity of an atom - the number of chemical bonds that atom can form with other atoms is its valence
Yes
A positively or negatively charged atom or group of atoms is called an ion
Yes
A chemical attraction between ions of opposite charge is called an ionic bond
Yes
To form an ionic bond, one ion is an electron donor, and the other ion is an electron acceptor
Yes
In a covalent bond, atoms share pairs of electrons.
Yes.
Covalent bonds are stronger than ionic bonds and are far more common in organic molecules.
Yes
