(Q).
Answer the following question given this paragraph: Covalent Molecules and Compounds Just as an atom is the simplest unit that has the fundamental chemical properties of an element, a molecule is the simplest unit that has the fundamental chemical properties of a covalent compound. Some pure elements exist as covalent molecules. Hydrogen, nitrogen, oxygen, and the halogens occur naturally. Q: What is the simplest unit that has the fundamental chemical properties of an element? Choices: - neutron - nucleus - cell - atom A:
(A).
atom

(Q).
Answer the following question given this paragraph: Covalent bonds form because they give atoms a more stable arrangement of electrons. Look at the hydrogen atoms in Figure above . Alone, each hydrogen atom has just one electron. By sharing electrons with another hydrogen atom, it has two electrons: its own and the one in the other hydrogen atom. The shared electrons are attracted to both hydrogen nuclei. This force of attraction holds the two atoms together as a molecule of hydrogen. Q: What bonds form because they give atoms a more stable arrangement of electrons? Choices: - Hydrogen bond - Ionic bond - Polar bond - covalent A:
(A).
covalent

(Q).
Answer the following question given this paragraph: Disorders of the urinary system include kidney stones, kidney failure, and urinary tract infections. Q: What system disorders include kidney stones, kidney failure, and urinary tract infections? Choices: - nervous system - digestive system - renal system - urinary system A:
(A).
urinary system