Of the alkaline earth metals, which two elements are the least reactive?
What will be an ideal response?
Question 2
According to the Arrhenius concept, an acid is a substance that ________.
A) is capable of donating one or more H+
B) causes an increase in the concentration of H+ in aqueous solutions
C) can accept a pair of electrons to form a coordinate covalent bond
D) reacts with the solvent to form the cation formed by autoionization of that solvent
E) tastes bitter
Question 3
The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is ________.
A) H+ (aq) + HNO3 (aq) + 2OH- (aq) 2H2O (l) + NO3- (aq)
B) HNO3 (aq) + NaOH (aq) NaNO3 (aq) + H2O (l)
C) H+ (aq) + OH- (aq) H2O (l)
D) HNO3 (aq) + OH- (aq) NO3- (aq) + H2O (l)
E) H+ (aq) + Na+ (aq) + OH- (aq) H2O (l) + Na+ (aq)
Question 4
The element chlorine is in a group known as the _______.
A) transition metals
B) noble gases
C) alkali metals
D) alkaline earth metals
E) halogens
Formed elements of blood: erythrocytes, leukocytes (neutrophils, eosinophils, basophils, lymphocytes
Hints of Earth’s Early Appearance
Earth’s Heat Budget
Layers of Earth
Planet Earth compared to all its water and air!
Formation of the Early Earth