A) 1.0×10−2 B) 3.18 C) 1.0×10−7 D) 6.6×10−4
A) It is exactly the same B) It is lower C) It is higher (3.18 vs < 0) D) It is not measurable
A) It becomes a base B) It remains exactly the same C) It decreases significantly D) It increases greatly due to homoassociation
A) Tri-fluoride (F3−) B) Bifluoride (HF2−) C) Hydroxide (OH−) D) Fluoride (F−)
A) -11 B) -10.2 C) 3.18 D) -12
A) Plastic B) Gold C) Rubber D) Glass
A) H3O+·F− B) HF2− C) H2F+ D) H2O·HF
A) Dehydration B) Homoconjugation C) Electrolysis D) Neutralization
A) It does not damage skin B) It interferes with nerve function C) It is a mild anesthetic D) It has an pleasant odor
A) Hydrogen peroxide B) Baking soda C) Pure alcohol D) Calcium gluconate gel
A) Bone hardening B) Bone mineralization C) Bone dissolution into gas D) Bone damage due to calcium interaction
A) High lipid affinity B) High boiling point C) Low volatility D) Presence of oxygen
A) It has a very strong, pungent odor B) It smells exactly like sulfur C) It is completely odorless under all conditions D) It may reach dangerous levels without an obvious odor
A) It is significantly stronger B) It is comparable C) It cannot be compared D) It is much weaker
A) Hair loss B) Bronchitis C) Pulmonary edema D) Rhinitis
A) A solid salt of fluoride B) A byproduct of gold refining C) A solution of hydrogen fluoride in water D) A gaseous form of hydrogen fluoride
A) Blue, basic and non-corrosive B) Opaque, acidic and viscous C) Colorless, acidic and highly corrosive D) Yellow, neutral and oily
A) 49% B) 10% C) 85% D) 25%
A) Pure water B) Nitrogen gas C) Copper sulfate D) Organofluorine compounds
A) Cryolite and aluminium trifluoride B) Potassium nitrate and silver fluoride C) Sodium chloride and calcium oxide D) Magnesium sulfate and iron pyrite
A) Manufacturing of glass lenses B) Etching silicon wafers C) Production of metallic aluminium D) Cleaning rust from metal
A) Sodium hydroxide B) Acetic acid C) Ethanol D) Buffered oxide etch
A) Carbon dioxide B) Nitrogen oxides C) Sulfur dioxide D) Silicon fluorides
A) Increasing the steam pressure B) Reducing the temperature of the water C) Dissolving iron oxides and silica-based contaminants D) Preventing the oxidation of steel
A) Acid maceration B) Heating the rock to melting C) High-pressure filtration D) Centrifugal separation
A) Marie Curie B) Dmitri Mendeleev C) Carl Wilhelm Scheele D) Antoine Lavoisier
A) Quartz B) Fluorite C) Apatite D) Bauxite
A) 25 °C B) Approximately 265 °C C) 100 °C D) 500 °C
A) Hydrochloric acid B) Sulfuric acid C) Nitric acid D) Phosphoric acid
A) Borosilicate glass B) Stainless steel C) Copper containers D) Fluorinated plastic (PTFE)
A) As a neutral salt B) As a weak acid C) As a strong base D) As a highly volatile gas |