The components of universal indicator solution can best be separated by

A. chromatography

B. filtration

C. evaporation

D. crystallization

E. fractional distillation

The number of replaceable hydrogen atoms in one acid indicates its

A. basicity

B. acidity

C. alkalinity

D. reactivity

E. pH value

Catalytic hydrogenation of alkenes produces compounds with the general formula

A. C_nH_2n+1 OH

B. C_nH_2n+1

C. C_nH_2n+2

D. C_nH_2n-2

E. C_x(H₂O)_y

A measure of the degree of disorder in a chemical system is known as the

A. enthalpy

B. free energy

C. activation energy

D. entrophy

E. equilibrium

In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of

A. definite proportion

B. conservation of matter

C. multiple proportions

D. reciprocal proportions

E. constant composition

Which of the following is not a property of magnesium oxide?

A. High melting point

B. Dissolution in polar solvents

C. Presence of ionic bonds

D. Possession of crystal lattice

E. Low binding energy

Which of the following would increase the rate of reaction of chips of a metal M as shown in the equation below? M_(s) + 2HCI_(aq) → MCI_2(aq) + H_2(g)

A. Diluting the hydrochloric acid

B. Adding some distilled water

C. Decreasing the temperature

D. Grinding the metal into powder

E. Increasing the pressure

The oxidation number of phosphorus in PO 3/4 is

A. + 1

B. +2

C. +3

D. +4

E. +5